CN100466758C - Tyre pressurel temperature monitoring system and automobile therewith - Google Patents

Tyre pressurel temperature monitoring system and automobile therewith Download PDF

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Publication number
CN100466758C
CN100466758C CNB2006100741589A CN200610074158A CN100466758C CN 100466758 C CN100466758 C CN 100466758C CN B2006100741589 A CNB2006100741589 A CN B2006100741589A CN 200610074158 A CN200610074158 A CN 200610074158A CN 100466758 C CN100466758 C CN 100466758C
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low frequency
tire
dual
mode antenna
frequency signal
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CNB2006100741589A
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Chinese (zh)
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CN1897717A (en
Inventor
刘新亮
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SAIC Volkswagen Automotive Co Ltd
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Shanghai Volkswagen Automotive Co Ltd
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  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The system comprises: a tire's assembly mounted on the tire of vehicle, which comprises a high frequency transmitting unit and a low frequency receiving unit; a sendreceive antenna comprising a high frequency unit and a low frequency unit, which is used for communicating with the tire's assembly; a controller connected to the sendreceive antenna and used to control the communication between the tire's assembly and the sendreceive antenna in order to supervise the temperature and pressure of the tire; a display unit connected to the controller and used to display the temperature and pressure of tire. The low frequency unit of the antenna is used to transmit the instruction from the controller to the tire's unit, and the high frequency unit of the antenna is used to receive the tire's temperature and pressure signals in high frequency from the high frequency unit in tire's assembly. The controller and the sendreceive antenna shares one communication route by using TDMA way, and the low frequency signals are used to make communication between the controller and the antenna.

Description

Tire pressure/temperature monitoring system and the vehicle of this system is housed
The application number that the application requires to be filed on July 15th, 2005 is the priority of 200520043458.1 patent application.
Technical field
The present invention relates to air pressure of automobile tire/temperature monitoring technology, more particularly, relate to a kind of tire pressure/temperature monitoring system and method, and the vehicle that uses this kind technology.
Background technology
Tire pressure and temperature are most important for the safety traffic of automobile, and irrational tire pressure (especially pressure is on the low side) also can obviously increase fuel consume.The system for monitoring pressure in tyre that has two kinds of patterns at present: direct-type and indirect type.Indirect type is the system that is attached in the tire anti-lock braking system (ABS), judges based on the four-wheel speed discrepancy, it can't monitor the tire temperature, direct-type then is the system that utilizes electronic sensor directly to measure tire internal pressure and temperature and information is transmitted, shown, and it one overlaps independently system (TPMS) often; Be subjected to the limitation of operation principle, the problem that the indirect type system exists false alarm frequency height, deficency tire location difficulty etc. to be difficult to overcome.The bottleneck of direct-type TPMS system then is the life-span of wireless telecommunications reliability and tire electronics module.Crowd TPMS that produces is an one-way system at present, promptly only has the unidirectional truck of from the tire electronic module to master controller (receiver), and tire module is operated under the autonomous fully pattern; Tire module monitors the variation of tire pressure/tire temperature or when unusual, with regard to transmission information to receiver, but it can't guarantee that master controller can correctly receive this information (when for example the speed of a motor vehicle is 180Km/h, typical frame information effectively receives has only 50%-60%), so in order to increase communication and warning reliability, tire module also has to repeatedly send redundant information (10 times even more, even like this, also can't guarantee the communication reliability that reaches high) when strengthening transmitting power.Tire module utilizes operate on battery power, and the emission power consumption of wireless messages is relatively large, and launching information can shorten battery life to multifrequency greatly inferiorly, high-power, so criticize the useful life that the tire electronics module of product one-way system can only be promised to undertake 4-5 at present.
Two-way direct-type tire electronics tire pressure monitoring system can be measured tire pressure and the temperature in the tire directly, in real time, for ensureing that driving safety provides portion the most direct guarantee.For the tire pressure/temperature monitoring system under the present state of the art, wherein most critical is battery life, communication reliability and the weight of tire module, wherein the most key with battery life especially.The tire electronics module of two-way direct-type and operation of receiver are under interactive model, tire module both can independently also can answer the requirement of receiver to send tire pressure and tire temperature information in real time, and can in information interactive process, guarantee the communication success, the redundancy that reduces tire module information sends, thereby save the tire module battery electric quantity, life-saving.How when alleviating tire module weight, to improve the communication reliability as far as possible to greatest extent and save battery electric quantity and just become a very important research project.The observation process power consumption of tire electronics module is very little, be generally several microamperes, but the wireless transmission process power consumption of information is relatively large, and peak value can reach several milliamperes.Only for for the button cell of a hundreds of MAH, the redundancy of unidirectional direct-type tire electronics module information, frequent transmission can be shortened its working life greatly for capacity.Two-way direct-type tire electronics module has overcome two above-mentioned shortcomings, so can prolong its working life relatively.
Still have some shortcomings in two links in present general scheme design: the cost of high frequency transmission line and tire electronics module transmitting power are bigger than normal.50 ohm of high frequency transmission lines and corresponding automobile will exceed 2-5 times more than with the price of connector with respect to the price of common shielding single line and common connector, and the consumption of four reception antenna scheme high frequency transmission lines is easily just more than 10 meters in the chassis, and connector also has seven, eight pairs more than.If use common shielding single line and common connector then per car can be saved the cost of units up to a hundred.In order to guarantee the good reception of reception antenna under the tire module high speed rotating state, most tire module all is operated under the high-power relatively emission state, for example for the module of 433.92MHz, be 10mW (the desirable field intensity at 10 meters of the electric Hertz antenna of distance can reach the V/m for 100dB μ) according to the maximum ERP of its permission of national standard.Being sent as of high-frequency signal intermittently sends (typical transmitting time mostly was within a few tens of milliseconds) in short-term, this state downward modulation radio frequency degree of haircuting can make the working life of tire module reach 5 years (this is the typical life of TPMS series products in the market, working life L=battery capacity C/ (emission frequency F * single emission power consumption Q)).The signal to noise ratio that receives the requirement of decoding chip group can accomplish that (the responsive level that signal detects is better than 7dB μ V (100dBmW)) to 6dB, and according to national standard, 10 meters measurements of background-noise level of 433.92MHz should be below 40dB μ v/m in the automotive environment.Just can learn that by simple computation the signal to noise ratio of this moment can reach 60dB (being far superior to 6dB).If the emission field intensity is reduced to original 0.707 times (transmitting power reduce to original half), signal to noise ratio is reduced to 57dB (still being much better than 6dB).Under same battery capacity and monitoring/launching condition, its life-span can be extended for original twice like this.In fact, for the system that four antennas distribute to receive, transmitting power can also reduce greatly, and (20dBmW), then signal to noise ratio is reduced to 30dB (still being better than 6dB) for example to be reduced to original 1/1000.So just can reach at an easy rate and car load same designed life (for example 10 years).Guarantee the communication reliability when how to reduce the tyre assembly transmitting power so that system reaches and car same designed life (for example 10 years), and how to use common shielding single line and connector to transmit information all be problem to be solved by this invention to reduce cost.
Summary of the invention
The object of the present invention is to provide a kind of novel tire pressure/temperature monitoring technology, to solve deficiency of the prior art.
According to a first aspect of the invention, provide a kind of tire pressure/temperature monitoring system, comprising: tyre assembly, be installed on the tire of vehicle, described tyre assembly comprises high-frequency emission unit and low frequency receiving element; Dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, communicates with the high-frequency emission unit and the low frequency receiving element of described tyre assembly; Controller links to each other with described dual-mode antenna by a connection line, and the communication between control tyre assembly and the dual-mode antenna also receives the tire pressure/tire temperature state information of described tyre assembly monitoring by dual-mode antenna; Display module links to each other with described controller, shows the tire pressure/tire temperature state information by tire pressure/temperature monitoring system monitoring; Wherein, the described dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure/tire temperature state information of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly; Described controller and described dual-mode antenna be with the shared same connection line of time-multiplexed mode, promptly sends instruction and receive the tire condition signal bit stream that comprises tire pressure/tire temperature state information by described dual-mode antenna demodulation to described dual-mode antenna by the same line road controller.
According to one embodiment of the invention, described controller comprises: the high-frequency signal decoding device receives the tire condition signal bit stream by described dual-mode antenna demodulation, and therefrom decodes tire pressure/tire temperature state information; The low frequency signal generation device, generation is used to control the instruction of described dual-mode antenna and tyre assembly, and is modulated into low frequency signal; High/low frequency link diverter switch switchably connects described high-frequency signal decoding device and low frequency signal generation device, is also connected to described connection line; When the low frequency signal generation device produced and launch low frequency signal, described high/low frequency link diverter switch switched to and makes low frequency signal generation device and described connection line couple to transmit low frequency signal on described connection line; When high-frequency signal decoding device receiving demodulation signal, described high/low frequency link diverter switch switches to and makes high frequency decoding device and described connection line couple to receive signal bit stream on described connection line.
According to one embodiment of the invention, the high/low frequency link diverter switch of described controller is periodically switched between high-frequency signal decoding device and low frequency signal generation device automatically, and the duration of low frequency signal generation device emission low frequency signal is shorter than high/low frequency link diverter switch and switches to the duration that is coupled with the low frequency signal generation device.
According to one embodiment of the invention, described controller is configured to be provided with the protection time slot when high/low frequency link diverter switch is switched, and does not transmit information in the protection time slot.
According to one embodiment of the invention; described controller is configured to have on the connection line duration of low frequency signal transmission to switch to the duration weak point that is connected with described low frequency signal generation device than described high/low frequency link diverter switch, and a protection time slot is respectively arranged before transmission and after the transmission.
According to one embodiment of the invention, described tyre assembly is fastened on the vehicle hub by valve cock, presses close to the inner ring of tire, comprising: the low frequency receiving element receives low frequency signal; The high-frequency emission unit, the emission high-frequency signal; Tire pressure/tire temperature sensor, gas in the contact tire detects tire pressure/tire temperature; Processor, link to each other with described low frequency receiving element, high-frequency emission unit and tire pressure/tire temperature sensor, instruct according to the low frequency of transmitting through dual-mode antenna that comes self-controller that receives by described low frequency receiving element, control sensor tire pressure/tire temperature, and tire pressure/tire temperature information is sent to the dual-mode antenna demodulation and is transmitted to controller by the high-frequency emission unit; And battery, be above-mentioned each parts power supply.
According to one embodiment of the invention, described dual-mode antenna is installed on the wheel cover of vehicle, comprising: high frequency Transmit-Receive Unit, reception/demodulation high-frequency signal; The low frequency Transmit-Receive Unit, the emission low frequency signal; The two-way signaling commutation circuit, commutation circuit connects described connection line, and switchably connect described high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, on connection line, transmit restituted signal when high frequency Transmit-Receive Unit and connection line couple switching to, on connection line, transmit low frequency signal when low frequency Transmit-Receive Unit and connection line couple when switching to.
According to one embodiment of the invention, the low frequency Transmit-Receive Unit of described dual-mode antenna and the low frequency receiving element of tyre assembly are realized communicating by letter by low frequency magnetic field.Preferable, described dual-mode antenna and tyre assembly are arranged in parallel, promptly in the tire rotary course low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of dual-mode antenna and tyre assembly along magnetic line of force direction keeping parallelism.
According to one embodiment of the invention, described high-frequency signal is 433.92MHz, and described low frequency signal is 125KHz.
According to one embodiment of the invention, described connection line is single-core shielding line or twisted-pair feeder, is connected with dual-mode antenna with described controller by connector.Preferable, dual-mode antenna has wheel limit demodulation function, and the connection line between described controller and dual-mode antenna is common shielding conductor or twisted-pair feeder.
According to a second aspect of the invention, a kind of vehicle with tire pressure/temperature monitoring system is provided, described tire pressure/temperature monitoring system comprises: the array tyre assembly, the tire number of the quantity of tyre assembly and vehicle is suitable, one group of described tyre assembly is installed on each tire of vehicle, and described each group tyre assembly comprises high-frequency emission unit and low frequency receiving element; The array dual-mode antenna, the quantity and the tyre assembly of dual-mode antenna are suitable, and each group dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, and each group dual-mode antenna communicates with the high-frequency emission unit and the low frequency receiving element of corresponding one group of tyre assembly; Controller, link to each other with described array dual-mode antenna by several connection lines, control corresponding tyre assembly of each group and the communication between the dual-mode antenna and receive tire pressure/tire temperature state information that described array tyre assembly is monitored by the array dual-mode antenna, wherein, for each group dual-mode antenna, use a connection line; Display module links to each other with described controller, shows the tire pressure/tire temperature state information by tire pressure/temperature monitoring system monitoring; Wherein, the described array dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure/tire temperature state information of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly; Described controller and described dual-mode antenna be with the shared same connection line of time-multiplexed mode, promptly sends instruction and receive the tire condition signal bit stream that comprises tire pressure/tire temperature state information by described dual-mode antenna demodulation to described dual-mode antenna by the same line road controller.
According to one embodiment of the invention, described controller comprises: the high-frequency signal decoding device receives the tire condition signal bit stream by described dual-mode antenna demodulation, and therefrom decodes tire pressure/tire temperature state information; The low frequency signal generation device, generation is used to control the instruction of described dual-mode antenna and tyre assembly, and is modulated into low frequency signal; High/low frequency link diverter switch switchably connects described high-frequency signal decoding device and low frequency signal generation device, is also connected to described connection line; When the low frequency signal generation device produced and launch low frequency signal, described high/low frequency link diverter switch switched to and makes low frequency signal generation device and described connection line couple to transmit low frequency signal on described connection line; When the high frequency decoding device received the high-frequency solution tonal signal, described high/low frequency link diverter switch switched to and makes high-frequency signal decoding device and described connection line couple the signal bit stream with receiving demodulation on described connection line.
According to one embodiment of the invention, described controller is configured to be provided with the protection time slot when high/low frequency link diverter switch is switched, and does not transmit information in the protection time slot; Perhaps described controller is configured to have on the connection line duration of low frequency signal transmission to switch to the duration weak point that is connected with described low frequency signal generation device than described high/low frequency link diverter switch, and a protection time slot is respectively arranged before transmission and after the transmission.
According to one embodiment of the invention, described tyre assembly is placed on the vehicle hub, presses close to the inner ring of tire, comprising: the low frequency receiving element receives low frequency signal; The high-frequency emission unit, the emission high-frequency signal; Tire pressure/tire temperature sensor, gas in the contact tire detects tire pressure/tire temperature; Processor, link to each other with described low frequency receiving element, high-frequency emission unit and tire pressure/tire temperature sensor, instruct according to the low frequency of transmitting through dual-mode antenna that comes self-controller that receives by described low frequency receiving element, control sensor tire pressure/tire temperature, and tire pressure/tire temperature information is sent to dual-mode antenna and is transmitted to controller by the high-frequency emission unit; And battery, be above-mentioned each parts power supply.
According to one embodiment of the invention, described dual-mode antenna is installed on the wheel cover of vehicle, comprising: high frequency Transmit-Receive Unit, reception/demodulation high-frequency signal; The low frequency Transmit-Receive Unit, the emission low frequency signal; The two-way signaling commutation circuit, commutation circuit connects described connection line, and switchably connect described high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, on connection line, transmit restituted signal when high frequency Transmit-Receive Unit and connection line couple switching to, on connection line, transmit low frequency signal when low frequency Transmit-Receive Unit and connection line couple when switching to.
According to one embodiment of the invention, the low frequency Transmit-Receive Unit of the dual-mode antenna that described each group is corresponding and the low frequency receiving element of tyre assembly are realized communicating by letter by low frequency magnetic field; And corresponding dual-mode antenna and the tyre assembly of described each group is arranged in parallel, promptly in the tire rotary course low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of corresponding dual-mode antenna and tyre assembly along magnetic line of force direction keeping parallelism.
According to one embodiment of the invention, described display module is placed on the instrument board of vehicle, comprises a viewing area.
According to one embodiment of the invention, dual-mode antenna has wheel limit demodulation function, and the connection line between described controller and dual-mode antenna is common shielding conductor or twisted-pair feeder.
According to a third aspect of the invention we, a kind of tire pressure/temperature monitoring method is provided, send instruction and receive tire pressure/tire temperature state information with low frequency on same connection line in time-multiplexed mode with high frequency, comprise: switch the connection line state to the state that transmits low frequency signal, on connection line, send instruction to a dual-mode antenna by a controller; Dual-mode antenna is communicated by letter with a tyre assembly with low frequency signal according to instruction, requires to carry out tire pressure/tire temperature and detects; Tyre assembly carries out tire pressure/tire temperature and detects, and with high-frequency signal the tire pressure/tire temperature state information of monitoring is sent to dual-mode antenna; Switch the state of connection line to the carry high frequency restituted signal, dual-mode antenna comprises the tire condition code stream of tire pressure/tire temperature state information to high-frequency signal demodulation and transmission to controller; Controller obtains the tire condition code stream decoding tire pressure/tire temperature state information and is sent to a display module to show; During vehicle take-offs, carry out above-mentioned step repeatedly.
According to one embodiment of the invention, be used to control the instruction of described dual-mode antenna and tyre assembly when switching connection line when transmitting the state of low frequency signal, producing, and be modulated into low frequency signal, on connection line, transmit; When switching connection line, receive high-frequency signal, and therefrom demodulation comprises the tire condition code stream of tire pressure/tire temperature state information to the state of carry high frequency restituted signal.
According to one embodiment of the invention, periodically between the state of state that transmits low frequency signal and carry high frequency restituted signal, switch automatically, and the duration of emission low frequency signal is shorter than the duration of switching connection line to the state that transmits low frequency signal.
According to one embodiment of the invention, when switching, be provided with the protection time slot, in the protection time slot, do not transmit information.
According to one embodiment of the invention, it is shorter than the duration of emission low frequency signal to the duration of transmitting low frequency signal to switch connection line, and a protection time slot is respectively arranged before transmission and after the transmission.
According to one embodiment of the invention, dual-mode antenna is realized communicating by letter by low frequency magnetic field with tyre assembly.
According to one embodiment of the invention, dual-mode antenna and tyre assembly are arranged in parallel, promptly in the tire rotary course low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of dual-mode antenna and tyre assembly along magnetic line of force direction keeping parallelism.
According to one embodiment of the invention, described high-frequency signal is 433.92MHz, and described low frequency signal is 125KHz.
According to one embodiment of the invention, described dual-mode antenna has wheel limit demodulation function, and the connection line between described controller and dual-mode antenna uses common shielding conductor or twisted-pair feeder.
The present invention's height two-frequency signal scheme (descending low frequency link 125KHz, up high frequency link 433.92MHz) has realized the interactive communication (sleeping/waking-transmission/affirmation mechanism allows tyre assembly be in fully under the monitoring of master controller) of the real time bidirectional of tyre assembly and controller.Communication reliability (dual-mode antenna and tyre assembly all during operate as normal communication reliability be 100%) has greatly improved in the working mechanism of the interactive communication of this real time bidirectional, and has significantly reduced the information redundancy emitting times (typically 1-2 emission can be finished communication) of tyre assembly; This system is aided with wheel limit demodulation scheme again, realized tyre assembly ultra low power emission (for example equivalent transmitting power reduces to-during 20dBmW, the decoding of wheel limit can guarantee that still signal reliably detects, since the signal of high frequency reception decoding chip detects responsive level generally all to be better than-100dBmW).The tyre assembly battery electric quantity can be significantly saved in the enforcement of interactive communication of real time bidirectional and wheel limit decoding scheme, and tyre assembly has been reached and car same designed life (for example, more than or equal to 10 years); In addition, the both-way communication pattern has also realized the active diagnosis of tyre assembly operating state and the identification automatically in real time of tyre assembly identity ID simultaneously, and this has further improved the reliability of whole system and the convenience of tyre assembly installation/replacing.Arrange consideration based on reduction system cost and simplification wire harness, the present invention proposes the two-way signaling that connects lead even also comprise the time sharing shared mechanism that power supply is powered, make controller be reduced to two lines from four lines to the line of dual-mode antenna.
Description of drawings
The present invention above-mentioned and other feature, character and advantage will be by becoming more obvious below in conjunction with further describing of drawings and Examples, in the accompanying drawings, identical Reference numeral is represented identical feature, wherein,
Fig. 1 is an example structure block diagram of tire pressure/temperature monitoring system of the present invention;
Fig. 2 is the detailed block diagram of tire pressure/temperature monitoring system of embodiment shown in Figure 1;
Fig. 3 is the sequential schematic diagram of two-way signaling conllinear transmission of the present invention;
Fig. 4 is the controller of another embodiment of the present invention and the circuit diagram of dual-mode antenna;
Fig. 5 is the cross section structure figure of the single-core shielding line that uses of the present invention.
Fig. 6 is the structural representation of an embodiment of vehicle of the present invention;
Fig. 7 is the flow chart of an embodiment of tire pressure/temperature monitoring method of the present invention;
Fig. 8 is the work and the pairing flow process of controller of the present invention;
Fig. 9 is the work and the pairing flow process of tyre assembly of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
Tire pressure/temperature monitoring system
According to a first aspect of the invention, at first provide a kind of tire pressure/temperature monitoring system, comprising: tyre assembly, be installed on the tire of vehicle, tyre assembly comprises high-frequency emission unit and low frequency receiving element; Dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, communicates with the high-frequency emission unit and the low frequency receiving element of tyre assembly; Controller links to each other with dual-mode antenna by a connection line, communication between control tyre assembly and the dual-mode antenna and the tire pressure/tire temperature state of monitoring by dual-mode antenna reception tyre assembly; Display module links to each other with controller, shows the tire pressure state by tire pressure/temperature monitoring system monitoring; Wherein, the dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure/tire temperature state of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly; Controller and dual-mode antenna be with the shared same connection line of time-multiplexed mode, sends instruction and receive tire pressure/tire temperature state by the dual-mode antenna demodulation to dual-mode antenna with low frequency.
Embodiment shown in Figure 1 provides a kind of tire pressure/temperature monitoring system 100, shows its structured flowchart with reference to figure 1, and this system 100 comprises: controller 102, reception antenna 104, tyre assembly 105 and display module 103.
Controller 102 comprises high-frequency signal decoding device 120 and low frequency signal generation device 122, and high-frequency signal decoding device 120 wherein receives the high-frequency solution tonal signal of being transmitted by dual-mode antenna 104, and therefrom decoding obtains tire pressure/tire temperature state; Low frequency signal generation device 122 produces and is used to control the instruction of dual-mode antenna 104 and tyre assembly 105, and is modulated into low frequency signal.Controller 102 also comprises a high/low frequency link diverter switch 124, one end switchably is connected to high-frequency signal decoding device 120 and low frequency signal generation device 122, switch between high-frequency signal decoding device 120 and low frequency signal generation device 122, the other end of high/low frequency link diverter switch 124 is connected to connection line 106.When low frequency signal generation device 122 produced and launches low frequency signal, high/low frequency diverter switch 124 switched to and makes low frequency signal generation device 122 and connection line 106 couple to transmit low frequency signal on connection line; When high frequency decoding device 120 receiving demodulation signals, high/low frequency link diverter switch 124 switches to and makes high frequency decoding device 120 and connection line 106 couple with transmission demodulation code stream signal on connection line 106.
Tyre assembly 105 in this tire pressure/temperature monitoring system 100 is fastened on the wheel hub of tire, presses close to the inner ring of tire, with reference to detailed structure view illustrated in fig. 2, comprising: low frequency receiving element 150 receives low frequency signal; High-frequency emission unit 152, the emission high-frequency signal; Tire pressure/tire temperature sensor 154, air in the contact tire detects tire pressure/tire temperature; Processor 156, link to each other with low frequency receiving element 150, high-frequency emission unit 152 and transducer 154, instruct according to the low frequency of transmitting through dual-mode antenna 104 that comes self-controller 102 that receives by low frequency receiving element 150, control transducer 154 detects tire pressure/tire temperature, and tire pressure/tire temperature information is sent to dual-mode antenna 104 and is transmitted to controller 102 by high-frequency emission unit 152, in this embodiment, tyre assembly 105 also comprises the battery 158 that is used to power.
Dual-mode antenna 104 in tire pressure/temperature monitoring system 100 of this embodiment is installed on the wheel cover of vehicle, also can be referred to as the wheel cover dual-mode antenna, comprise: high frequency Transmit-Receive Unit 140, reception/demodulation high-frequency signal, its medium-high frequency Transmit-Receive Unit 140 receives high-frequency signal from the high-frequency emission unit 152 of tyre assembly 105 by the electromagnetic field of high frequency, and transmits restituted signals by connection line 106 to controller 102; Low frequency Transmit-Receive Unit 142, the emission low frequency signal, its medium and low frequency Transmit-Receive Unit 142 receives the low frequency signal of self-controller 102 by connection line 106, and by the low frequency receiving element 150 emission low frequency signals of low frequency magnetic field to tyre assembly 105; Two-way signaling commutation circuit 144, two-way signaling commutation circuit 144 connects connection line 106, and high frequency Transmit-Receive Unit 140 and low frequency Transmit-Receive Unit 142, be couple to and transmit two-way signaling on the connection line 106 further with reference to detailed structure view shown in Figure 2, as seen, the low frequency receiving element 150 of the low frequency Transmit-Receive Unit 142 of dual-mode antenna 104 and tyre assembly 105 is realized communicating by letter by low frequency magnetic field among this embodiment.And dual-mode antenna 104 and tyre assembly 105 are arranged in parallel, promptly in the tire rotary course low frequency receiving element 150 axis of low frequency Transmit-Receive Unit 142 axis of dual-mode antenna 104 and tyre assembly 105 along magnetic line of force direction keeping parallelism.The reason of doing like this is, is a key link in the transmission and the reception of this bilateral system medium and low frequency field signal, is the important ancillary hardware resource that the tire electronics module realizes the energy saving of system operation.The arrangement of the low frequency Transmit-Receive Unit of dual-mode antenna and the low frequency receiving element of tyre assembly is to realize the efficient key element that receives.The direction variation issue that adopts the method for being arranged in parallel to overcome the tire rotation herein and cause, promptly at the axis of tire rotary course medium and low frequency receiving element coil and low frequency Transmit-Receive Unit coil place axis along magnetic line of force direction keeping parallelism, thereby reduce the tire rotation greatly and the field strength stack variable effect that causes
In this embodiment, high-frequency signal is 433.92MHz, and low frequency signal is 125KHz.According to an embodiment, the high/low frequency link of controller 102 switches 124 switch periods ground and switches between high-frequency signal demodulating equipment 120 and low frequency signal generation device 122 automatically, and the duration of low frequency signal generation device emission low frequency signal is shorter than high/low frequency diverter switch and switches to the duration that is coupled with the low frequency signal generation device.At this moment, controller 102 is configured to be provided with the protection time slot when high/low frequency diverter switch 124 is switched, and does not transmit information in the protection time slot.Perhaps; according to another kind of handover scheme; controller 102 is configured to have on the connection line 106 duration of low frequency signal transmission to switch to the duration weak point that is connected with the low frequency signal generation device than high/low frequency diverter switch 124, and a protection time slot is respectively arranged before transmission and after the transmission.
In system 100 of the present invention, the high and low frequency link signal is with the shared same connection line 106 of time-multiplexed mode, and dual-mode antenna assembly 104 uses high frequency link, transmits signal, the normally tire pressure after the demodulation/tire temperature state to controller 102; And controller 102 uses low frequencies, transmits signal, normally control commands such as the signal of 4kHz to dual-mode antenna assembly 104.Because shared same the connection line 106 of low-and high-frequency link signal, therefore be responsible for that by high/low frequency link diverter switch 124 connection line 106 is connected to high-frequency signal and receive decoding device and low frequency signal generation device, thereby realize the timesharing conllinear transmission of high and low frequency link signal, the sequential chart of transmission control can be with reference to shown in Figure 3:
Between high-frequency signal receiving demodulation device and low frequency signal generation device, switch to low-and high-frequency link switch periods, when in switching to high frequency link, receiving decoding device, be called " high frequency side "; When switching to the low frequency signal generation device, be called " lower frequency side ".The high-frequency signal decoding device of controller receives the high frequency link signal at " high frequency side " by connection line 106, accordingly, the high frequency Transmit-Receive Unit of dual-mode antenna sends restituted signal at " high frequency side " by connection line 106, and high-frequency signal is then launched to the high frequency Transmit-Receive Unit of dual-mode antenna by the high-frequency emission unit of tyre assembly.The low frequency signal generation device of controller sends low frequency signal at " lower frequency side " on connection line 106, corresponding, and the low frequency Transmit-Receive Unit of dual-mode antenna is transmitted to the low frequency receiving element of tyre assembly at " lower frequency side " reception low frequency signal and by magnetic field.Need explanation herein, in Fig. 3, " high frequency side " and " lower frequency side " is regarded as periodically and is equally spaced, but in the application of reality, do not need to realize the strict uniformly-spaced cycle, the duration of each " high frequency side " or " lower frequency side " can be not isometric, and the situation of continuous " high frequency side " or continuous " lower frequency side " also occurs, and this all is that those skilled in the art can predict.Equally, " high frequency side " and " lower frequency side " also not necessarily needs is periodic, can carry out random adjustment as required.Need explanation equally; the term of Shi Yonging " high frequency side " and " lower frequency side " are for convenience of description herein; scope of the present invention is not carried out any restriction; those skilled in the art can change the title of these terms according to hobby, and this does not have any influence to protection range of the present invention.
Continuation with reference to figure 3 as seen, in order to ensure the phenomenon that the reception/transmission of low-and high-frequency signal can not occur crosstalking, the present invention has added the protection time slot when transmitting, the protection time slot generally is added on high/low frequency link diverter switch when switching.Such as with reference to figure 3,, in the protection time slot, do not transmit any information when high/low frequency link diverter switch switches to " lower frequency side " or when " lower frequency side " switches to " high frequency side ", all has the protection time slot from " high frequency side ".In the embodiment shown in fig. 3; the protection time slot all is to be added in " lower frequency side "; promptly receive the duration of low frequency signal; it is the duration of low frequency signal generation device emission low frequency signal; it is shorter than high/low frequency switch and switches to the duration that is connected with the low frequency signal generation device; i.e. duration of " lower frequency side "; like this; just all added a protection time slot in the front and back that low frequency signal transmits; guaranteed before the transmission of carrying out low frequency signal do not had high-frequency signal to continue to receive, and after the low frequency signal transmission is finished; wait for and do not have fully to begin to receive high-frequency signal again after the low frequency signal transmission.Need to prove; it should be appreciated by those skilled in the art; the protection time slot can be added on " lower frequency side "; also can be added on " high frequency side "; the both can reach the purpose of protection; though the protection time slot all is added on " lower frequency side " among the embodiment that illustrates herein, other situation also is that those skilled in the art can predict.After having saved the expensive high-frequency connection line, another object of the present invention is to reduce the transmitting power of tyre assembly, and uses common shielding single-core line and common connector to realize the transmission of signal.Insertion loss that a problem of being brought of using common shielding single core cable and common connector is 433.92MHz high-frequency signal decay (50 ohm of coaxial cables of typical case are better than 0.1dB/m in the insertion loss of 433.92MHz, and the insertion loss of common shielding single-core line may be up to 1dB/m).Because frequency modulating signal (for example 10K bps) generally all is significantly less than frequency of carrier signal, so in the present invention, this insertion loss solves by wheel limit demodulator circuit is set at the reception antenna end, just uses a wheel limit demodulator circuit modulation signal demodulation to be come out in advance and send to solve loss and the reduction of avoiding signal to noise ratio
Fig. 5 is the connection line 106 that the present invention uses, and the cross section structure figure of single-core shielding line comprises: external insulation layer 112, conductive shielding layer 114, inner insulating layer 116 and center conductor 118.The low frequency signal of transmission modulation signal and 125KHz on this single-core shielding line 106.
Dual-mode antenna embodiment
Fig. 4 is the embodiment of dual-mode antenna of the present invention.Its circuit structure is with reference to shown in Figure 4, and operation principle is as follows: wherein slave controller is to the low frequency signal of dual-mode antenna, high-frequency signal and power sharing power supply/holding wire and ground wire two wires shown in Figure 4 from the dual-mode antenna to the controller.Low frequency signal is coupled to signal on power supply/holding wire by T1 and T2 triode; The signal that demodulation is come out in same high frequency reception/demodulation is coupled to signal on power supply/holding wire by the T3 triode.Wherein low frequency signal and high-frequency signal are time signal, and promptly whether whether monitoring control devices power supply/holding wire free time send to low-frequency modulation signal on power supply/holding wire with decision.Triode T1, T2, T3 can be understood as common constituted high/low frequency diverter switch 124 in the controller and two-way signaling commutation circuit 144 in the dual-mode antenna 104.
With reference to figure 4, concrete circuit is as follows, in controller 102 parts, comprises high-frequency signal decoding device 120 and low frequency signal generation device 122, wherein low frequency signal generation device 122 connects the base stage of triode T1 and T2, and the collector electrode of triode T1 also is connected to V by resistance R 1 Bat, the emitter of triode T1 is connected to V by resistance R 1 Bat, the collector electrode of triode T2 is connected to V by resistance R 2 Bat, the grounded emitter of triode T2, power supply/holding wire is drawn from the collector electrode of emitter/triode T2 of triode T1.In dual-mode antenna 104 parts, comprise triode T3, the emitter of triode T3 is by resistance R 5 ground connection, and the collector electrode of triode T3 connects power supply/holding wire by resistance R 3, also links to each other by a ground wire between dual-mode antenna 104 and the controller 102.Thus, triode T1, T2, T3 have constituted high/low frequency diverter switch 124 in the controller and two-way signaling commutation circuit 144 in the dual-mode antenna 104 jointly.Continuation is with reference to remaining circuit, and a low frequency magnetic field coil one end is by capacitor C 1 ground connection, and the other end is connected to power supply/holding wire by diode D1, and the positive pole of diode D1 connects power supply/holding wire, and negative pole connects the low frequency magnetic field coil.Power supply/holding wire is also connected to resistance R 4, resistance R 4 is connected to the positive pole of diode D2, the negative pole of diode D2 connects a Voltage stabilizing module, the two ends of Voltage stabilizing module are respectively by an isolation capacitance C2, C3 ground connection, Voltage stabilizing module is stabilized to 5V with voltage, Voltage stabilizing module continues to connect a high frequency reception/demodulation module, and high frequency reception/demodulation module is connected to high frequency antenna.High frequency reception/demodulation module is also exported a feedback, for through the high-frequency signal of the demodulation base stage to triode T3.
The working mechanism of this circuit is as follows: overcome relative short life and two bottleneck problems of low-and high-frequency signal transmitting and receiving reliability that the tyre assembly energy consumption causes, the present invention adopts " sleeping/waking-transmission/affirmation " working mechanism.Controller sends instruction to tyre assembly by the 125KHz low frequency by dual-mode antenna, and tyre assembly then sends to controller to tire pressure by dual-mode antenna by the high-frequency signal of 433.92MHz." waking up " instruction that vehicle energising igniting rear tyre assembly receives the controller transmission enters (partly) autonomous discontinuous operation state, and gives controller tire pressure, tire temperature and other feedback information immediately.The resting period difference of different function units in the tyre assembly (the tire pressure monitoring cycle for example can be made as 2 seconds), and high frequency sends and low frequency to receive relative energy consumption big, so its resting period is also wanted big (for example high frequency transmission and low frequency receiving cycle can be made as 10 minutes).For fear of omitting fast the change or other emergence messages, high frequency sends and low frequency receive can also be by event-driven, promptly monitor tire pressure varies Δ P, tire temperature change Delta T or tyre assembly and start high frequency transmission and low frequency reception when unusual immediately.For guaranteeing the validity of system information transmitting-receiving, tyre assembly will repeatedly be launched information frame as required, till the effective information of receiving controller " affirmation ".From saving the angle of energy, a limit value (for example 5 frames) can be set for the number of times of tyre assembly repeat its transmission.If still do not receive confirmation after sending 5 frames, then eliminate " principal and subordinate " automatically and concern and enter " dereliction " resting state.Tyre assembly medium and low frequency signal antenna reception this moment decoded portion can be in " intermittently " operating state (for example the low frequency decoding cycle is set to 2 seconds), and transducer and high frequency send part and then be in resting state.If controller a high frequency in the resting period (for example 10 minutes) do not monitor effective information from certain tyre assembly, then can send " waking up " instruction at this tyre assembly, allow this tyre assembly enter the discontinuous operation state again.Get nowhere if " wake up ", controller enters " failure operation " pattern after getting rid of factors such as " co-channel interferences ".Controller enters " arrangement " state behind the car load power cutoff, sends " dormancy " instruction at once after receiving the information that the tire electronics module sends over.Tyre assembly receives " dormancy " instruction that control module sends over and enters " master is arranged " resting state; Microprocessor, transducer and low-frequency antenna reception decoded portion are in " intermittently " operating state (for example the low frequency decoding cycle is set to 2 seconds, and cycle sensor was made as 10 minutes) in the tyre assembly at this moment, and high frequency sends part and then is in resting state.Controller makes four tire electronics modules all enter dormancy or enters arrangement and also enters the powered down sleep state automatically after 15 minutes.Be in the tire electronics module of " master is arranged " resting state,, then eliminate " principal and subordinate " relation and enter " dereliction dormancy " state if monitor tire pressure≤0.2Bar.Utilize this " sleeping/waking-transmission/affirmation " mechanism can also realize the automatic foundation that " principal and subordinate " concerns between tyre assembly and the controller, the i.e. automatic identification of tyre assembly identity, tire location and controller identity.Automotive ignition energising back controller sends " waking up " instruction of carrying controller identity information and antenna position information to the tyre assembly that is in " dereliction " resting state and excites.Being in " dereliction " resting state tyre assembly will not be stimulated.Controller can not receive the feedback information of certain wheel, gets rid of will start a new master slave relation at this tire electronics module after other factor affecting and confirm process.Controller sends " pairing " instruction of carrying own identity information, antenna position information by corresponding low-frequency antenna.Tyre assembly is given controller feedback information such as the identity information of oneself, aerial positions after receiving " pairing " instruction, receives after controller " affirmation " instructs and finishes this principal and subordinate " pairing " process.The identity coding of controller storage tyre assembly indicates as the tire information source, and the tyre assembly then identity coding and the positional information of storage control indicates as the call information source.The workflow of controller and tyre assembly and pairing are as shown in Figure 10 and Figure 11.
Thus, the native system function is finished by the co-ordination of tyre assembly, dual-mode antenna, controller and display module.System is high (433.92MHz-up link), the two-way hybrid system of low frequency (125KHz-down link).Tyre assembly is operated in half from major state in native system, and controller is judged according to the information that tyre assembly sends.Tyre assembly and controller are operated under the two-way mode of " sleeping/waking-transmission/affirmation ".Be combined into fixing principal and subordinate's function combinations after tyre assembly and controller are recognized each other and finished, its middle controller is main, tyre assembly be from.Controller, tyre assembly and antenna module all have identity ID separately to be indicated.Each high/low frequency Anneta module calls out antenna by low frequency and high frequency receiving demodulation unit is formed, and whole system comprises low-frequency antenna and high frequency receiving demodulation unit (four add four systems).If suitably reduce the requirement that high frequency is received the error rate, then also can adopt four low-frequency antennas to add a high frequency and receive the low-cost system (four add a system) that decoding unit is formed.
Vehicle embodiment
According to a second aspect of the invention, a kind of vehicle with tire pressure/temperature monitoring system is provided, this tire pressure/temperature monitoring system comprises: the array tyre assembly, the tire number of the quantity of tyre assembly and vehicle is suitable, one group of described tyre assembly is installed on each tire of vehicle, and each group tyre assembly comprises high-frequency emission unit and low frequency receiving element; The array dual-mode antenna, the quantity and the tyre assembly of dual-mode antenna are suitable, and each group dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, and each group dual-mode antenna communicates with the high-frequency emission unit and the low frequency receiving element of corresponding one group of tyre assembly; Controller, link to each other with described array dual-mode antenna by several connection lines, control corresponding tyre assembly of each group and the communication between the dual-mode antenna and receive the tire pressure state that described array tyre assembly is monitored by the array dual-mode antenna, wherein, for each group dual-mode antenna, use a connection line; Display module links to each other with controller, shows the tire pressure state by tire pressure/temperature monitoring system monitoring; Wherein, the array dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure state of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly; Controller and each are organized described dual-mode antenna with the shared same connection line of time-multiplexed mode, send instruction and receive tire pressure/tire temperature state of being transmitted by the dual-mode antenna demodulation to dual-mode antenna with low frequency.
This controller comprises: the high-frequency signal decoding device receives the restituted signal of being transmitted by dual-mode antenna, and therefrom decodes tire pressure/tire temperature state; The low frequency signal generation device, generation is used to control the instruction of dual-mode antenna and tyre assembly, and is modulated into low frequency signal; High/low frequency link diverter switch switchably connects high-frequency signal decoding device and low frequency signal generation device, is also connected to connection line; When the low frequency signal generation device produced and launch low frequency signal, high/low frequency link diverter switch switched to and makes low frequency signal generation device and connection line couple to transmit low frequency signal on connection line; When the high-frequency signal decoding device received high-frequency signal, high/low frequency link diverter switch switched to and makes high-frequency signal decoding device and connection line couple to transmit restituted signal on connection line.
This controller is configured to be provided with the protection time slot when high/low frequency link diverter switch is switched, and does not transmit information in the protection time slot; Perhaps controller is configured to have on the connection line duration of low frequency signal transmission to switch to the duration weak point that is connected with the low frequency signal generation device than high/low frequency link diverter switch, and a protection time slot is respectively arranged before transmission and after the transmission.
This tyre assembly is placed on the vehicle hub, presses close to the inner ring of tire, comprising: the low frequency receiving element receives low frequency signal; The high-frequency emission unit, the emission high-frequency signal; Tire pressure/tire temperature sensor, gas in the contact tire detects tire pressure/tire temperature; Processor, link to each other with transducer with low frequency receiving element, high-frequency emission unit, instruct according to the low frequency of transmitting through dual-mode antenna that comes self-controller that receives by the low frequency receiving element, control sensor tire pressure/tire temperature, and information is sent to dual-mode antenna and is transmitted to controller by the high-frequency emission unit.
Dual-mode antenna is installed on the wheel cover of vehicle, comprising: high frequency Transmit-Receive Unit, reception/demodulation high-frequency signal; The low frequency Transmit-Receive Unit, reception/emission low frequency signal; The two-way signaling commutation circuit, commutation circuit connects described connection line, and switchably connect described high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, on connection line, transmit restituted signal when high frequency Transmit-Receive Unit and connection line couple switching to, on connection line, transmit low frequency signal when low frequency Transmit-Receive Unit and connection line couple when switching to.
The low frequency Transmit-Receive Unit of the dual-mode antenna that each group is corresponding and the low frequency receiving element of tyre assembly are realized communicating by letter by low frequency magnetic field; And corresponding dual-mode antenna and the tyre assembly of each group is arranged in parallel, promptly in the tire rotary course low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of corresponding dual-mode antenna and tyre assembly along magnetic line of force direction keeping parallelism.
Above-mentioned tire pressure/temperature monitoring system operation principle is similar to aforesaid embodiment with basic structure, and just no longer repeat specification for vehicle embodiment, need to prove display module 103 wherein herein.With reference to figure 6, it is the structural representation of an embodiment of vehicle of the present invention, wherein show tyre assembly 105, dual-mode antenna 104, controller 102 and display module 103, wherein display module 103 is placed on the instrument board of vehicle, comprises a viewing area 103A.
Tire pressure/temperature monitoring method embodiment
According to a third aspect of the invention we, provide a kind of tire pressure/temperature monitoring method, wherein, on same connection line, send instruction and receive the tire pressure state, comprise the following steps: with high frequency with low frequency in time-multiplexed mode
A. switch the connection line state to the state that transmits low frequency signal, on connection line, send instruction to a dual-mode antenna with low frequency signal by a controller; Be used to control the instruction of described dual-mode antenna and tyre assembly when switching connection line when transmitting the state of low frequency signal, producing, and be modulated into low frequency signal, on connection line, transmit;
B. dual-mode antenna is communicated by letter with a tyre assembly with low frequency signal according to instruction, requires to carry out tire pressure and detects;
C. tyre assembly carries out tire pressure/tire temperature detection, and with high-frequency signal the tire pressure state of monitoring is sent to dual-mode antenna;
D. switch the state of connection line state to the carry high frequency link, dual-mode antenna sends the tire pressure state to the high-frequency solution tonal signal to controller on connection line; When switching connection line, receive the high-frequency solution tonal signal, and therefrom decoding obtains tire pressure/tire temperature state to the state of carry high frequency link
E. controller is sent to display module demonstration with tire pressure/tire temperature state;
F. during vehicle take-offs, carry out above-mentioned step repeatedly.
According to an embodiment, can periodically between the state of state that transmits low frequency signal and transmitting high-frequency signal, switch automatically, and the duration of emission low frequency signal is shorter than the duration of switching connection line to the state that transmits low frequency signal.Sequential chart in conjunction with above-mentioned Fig. 3 describes when switching, is provided with the protection time slot, does not transmit information in the protection time slot.Perhaps, it is shorter than the duration of emission low frequency signal to the duration of transmitting low frequency signal to switch connection line, and a protection time slot is respectively arranged before transmission and after the transmission.
Similar with top description, dual-mode antenna is realized communicating by letter by low frequency magnetic field with tyre assembly.Preferable, dual-mode antenna and tyre assembly are arranged in parallel, promptly in the tire rotary course low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of dual-mode antenna and tyre assembly along magnetic line of force direction keeping parallelism.
Equally, high-frequency signal is 433.92MHz, and low frequency signal is 125KHz.
The operation principle of above-mentioned tire pressure/temperature monitoring method is with similar to aforesaid embodiment, and just no longer repeat specification herein, the workflow of controller and tyre assembly and pairing also can be as with reference to figure 8 and shown in Figure 9.
Conclusion
Comprehensive, tire pressure/temperature monitoring method of the present invention has following characteristics:
1) high frequency, low frequency two-way operation pattern
2) sleeping/waking-transmission/affirmation real-time interactive mode of operation
3) wheel limit demodulation, controller decoding arrangement (four of four high frequency demodulation, four low-frequency antennas add cubic case)
4) controller, tyre assembly and dual-mode antenna all possess the mode of identity code
5) the automatic pairing work mode of controller, tire electronics module and wheel cover low-frequency antenna
6) parallel arrangement of transmitting-receiving transmission and tyre assembly
7) power supply/two-way signaling timesharing conllinear layout/working method
The arrangement of a 8) high frequency demodulation, four low-frequency antennas (adds four)
The present invention's height two-frequency signal scheme (descending low frequency 125KHz, up high frequency 433.92MHz) has realized the interactive communication (sleeping/waking-transmission/affirmation mechanism allows tyre assembly be in fully under the monitoring of master controller) of the real time bidirectional of tyre assembly and controller.Communication reliability (dual-mode antenna and tyre assembly all during operate as normal communication reliability be 100%) has greatly improved in the working mechanism of the interactive communication of this real time bidirectional, and has significantly reduced the information redundancy emitting times (typically 1-2 emission can be finished communication) of tyre assembly; This system is aided with wheel limit decoding scheme again, realized tyre assembly ultra low power emission (for example equivalent transmitting power reduces to-during 20dBmW, the decoding of wheel limit can guarantee that still signal reliably detects, since the signal of high frequency reception decoding chip detects responsive level generally all to be better than-100dBmW).The tyre assembly battery electric quantity can be significantly saved in the enforcement of interactive communication of real time bidirectional and wheel limit decoding scheme, and tyre assembly has been reached and same life-span of car (greater than 10 years); In addition, the both-way communication pattern has also realized the active diagnosis of tyre assembly operating state and the identification automatically in real time of tyre assembly identity ID simultaneously, and this has further improved the reliability of whole system and the convenience of tyre assembly installation/replacing.Based on reducing system cost and simplifying wire harness and arrange consideration, the present invention proposes the shared mechanism of timesharing power supply/holding wire, make controller be reduced to two lines from four lines to the line of dual-mode antenna.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.

Claims (26)

1. tire pressure/temperature monitoring system comprises:
Tyre assembly is installed on the tire of vehicle, and described tyre assembly comprises high-frequency emission unit and low frequency receiving element;
Dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, communicates with the high-frequency emission unit and the low frequency receiving element of described tyre assembly;
Controller links to each other with described dual-mode antenna by a connection line, and the communication between control tyre assembly and the dual-mode antenna also receives the tire pressure/tire temperature state information of described tyre assembly monitoring by dual-mode antenna, and wherein, described controller comprises:
The high-frequency signal decoding device receives the tire condition signal bit stream by described dual-mode antenna demodulation, and therefrom decodes tire pressure/tire temperature state information;
The low frequency signal generation device, generation is used to control the instruction of described dual-mode antenna and tyre assembly, and is modulated into low frequency signal;
High/low frequency link diverter switch switchably connects described high-frequency signal decoding device and low frequency signal generation device, is also connected to described connection line;
When the low frequency signal generation device produced and launch low frequency signal, described high/low frequency link diverter switch switched to and makes low frequency signal generation device and described connection line couple to transmit low frequency signal on described connection line; When high-frequency signal decoding device receiving demodulation signal, described high/low frequency link diverter switch switches to and makes high frequency decoding device and described connection line couple to receive signal bit stream on described connection line;
Display module links to each other with described controller, shows the tire pressure/tire temperature state information by tire pressure/temperature monitoring system monitoring;
Wherein, the described dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure/tire temperature state information of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly;
Described controller and described dual-mode antenna be with the shared same connection line of time-multiplexed mode, promptly sends instruction and receive the tire condition signal bit stream that comprises tire pressure/tire temperature state information by described dual-mode antenna demodulation to described dual-mode antenna by the same line road controller.
2. tire pressure/temperature monitoring system as claimed in claim 1, it is characterized in that, the high/low frequency link diverter switch of described controller is periodically switched between high-frequency signal decoding device and low frequency signal generation device automatically, and the duration of low frequency signal generation device emission low frequency signal is shorter than high/low frequency link diverter switch and switches to the duration that is coupled with the low frequency signal generation device.
3. tire pressure/temperature monitoring system as claimed in claim 2 is characterized in that, described controller is configured to be provided with the protection time slot when high/low frequency link diverter switch is switched, and does not transmit information in the protection time slot.
4. tire pressure/temperature monitoring system as claimed in claim 2; it is characterized in that; described controller is configured to have on the connection line duration of low frequency signal transmission to switch to the duration weak point that is connected with described low frequency signal generation device than described high/low frequency link diverter switch, and a protection time slot is respectively arranged before transmission and after the transmission.
5. tire pressure/temperature monitoring system as claimed in claim 1 is characterized in that described tyre assembly is fastened on the vehicle hub by valve cock, presses close to the inner ring of tire, comprising:
The low frequency receiving element receives low frequency signal;
The high-frequency emission unit, the emission high-frequency signal;
Tire pressure/tire temperature sensor, gas in the contact tire detects tire pressure/tire temperature;
Processor, link to each other with described low frequency receiving element, high-frequency emission unit and tire pressure/tire temperature sensor, instruct according to the low frequency of transmitting through dual-mode antenna that comes self-controller that receives by described low frequency receiving element, control sensor tire pressure/tire temperature, and tire pressure/tire temperature information is sent to the dual-mode antenna demodulation and is transmitted to controller by the high-frequency emission unit; And battery, be above-mentioned each parts power supply.
6. tire pressure/temperature monitoring system as claimed in claim 5 is characterized in that, described dual-mode antenna is installed on the wheel cover of vehicle, comprising:
The high frequency Transmit-Receive Unit, reception/demodulation high-frequency signal;
The low frequency Transmit-Receive Unit, the emission low frequency signal;
The two-way signaling commutation circuit, commutation circuit connects described connection line, and switchably connect described high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, when switching to high frequency Transmit-Receive Unit and connection line and couple on connection line transmission high-frequency solution tonal signal, on connection line, transmit low frequency signal when low frequency Transmit-Receive Unit and connection line couple when switching to.
7. tire pressure/temperature monitoring system as claimed in claim 6 is characterized in that, the low frequency Transmit-Receive Unit of described dual-mode antenna and the low frequency receiving element of tyre assembly are realized communicating by letter by low frequency magnetic field.
8. tire pressure/temperature monitoring system as claimed in claim 7, it is characterized in that, described dual-mode antenna and tyre assembly are arranged in parallel, promptly the low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of dual-mode antenna and tyre assembly is along magnetic line of force direction keeping parallelism in the tire rotary course, and its medium and low frequency Transmit-Receive Unit and low frequency receiving element are coils.
9. tire pressure/temperature monitoring system as claimed in claim 8 is characterized in that using the two-way complex method of low-and high-frequency between dual-mode antenna and the tyre assembly, and described high-frequency signal is 433.92MHz, and described low frequency signal is 125KHz.
10. tire pressure/temperature monitoring system as claimed in claim 1 is characterized in that, described connection line is single-core shielding line or twisted-pair feeder, is connected with dual-mode antenna with described controller by connector.
11. tire pressure/temperature monitoring system as claimed in claim 1 is characterized in that, dual-mode antenna has wheel limit demodulation function, and the connection line between described controller and dual-mode antenna is common shielding conductor or twisted-pair feeder.
12. the vehicle with tire pressure/temperature monitoring system is characterized in that, described tire pressure/temperature monitoring system comprises:
The array tyre assembly, the tire number of the quantity of tyre assembly and vehicle is suitable, and one group of described tyre assembly is installed on each tire of vehicle, and described each group tyre assembly comprises high-frequency emission unit and low frequency receiving element;
The array dual-mode antenna, the quantity and the tyre assembly of dual-mode antenna are suitable, and each group dual-mode antenna comprises high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, and each group dual-mode antenna communicates with the high-frequency emission unit and the low frequency receiving element of corresponding one group of tyre assembly;
Controller, link to each other with described array dual-mode antenna by several connection lines, control corresponding tyre assembly of each group and the communication between the dual-mode antenna and receive tire pressure/tire temperature state information that described array tyre assembly is monitored by the array dual-mode antenna, wherein, for each group dual-mode antenna, use a connection line, wherein, described controller comprises:
The high-frequency signal decoding device receives the tire condition signal bit stream by described dual-mode antenna demodulation, and therefrom decodes tire pressure/tire temperature state information;
The low frequency signal generation device, generation is used to control the instruction of described dual-mode antenna and tyre assembly, and is modulated into low frequency signal;
High/low frequency link diverter switch switchably connects described high-frequency signal decoding device and low frequency signal generation device, is also connected to described connection line;
When the low frequency signal generation device produced and launch low frequency signal, described high/low frequency link diverter switch switched to and makes low frequency signal generation device and described connection line couple to transmit low frequency signal on described connection line; When the high frequency decoding device received the high-frequency solution tonal signal, described high/low frequency link diverter switch switched to and makes high-frequency signal decoding device and described connection line couple the tire condition signal bit stream with receiving demodulation on described connection line;
Display module links to each other with described controller, shows the tire pressure/tire temperature state information by tire pressure/temperature monitoring system monitoring;
Wherein, the described array dual-mode antenna instruction of using low frequency to launch self-controller to the low frequency receiving element of tyre assembly by the low frequency Transmit-Receive Unit; And by the tire pressure/tire temperature state information of high frequency Transmit-Receive Unit reception by the high-frequency emission unit usefulness high-frequency emission of tyre assembly;
Described controller is organized described dual-mode antenna with the shared same connection line of time-multiplexed mode with each respectively, sends instruction and receives the tire condition signal bit stream code stream that comprises tire pressure/tire temperature state information by described dual-mode antenna demodulation to described dual-mode antenna with low frequency.
13. vehicle as claimed in claim 12 is characterized in that, described controller is configured to be provided with the protection time slot when high/low frequency link diverter switch is switched, and does not transmit information in the protection time slot; Perhaps described controller is configured to have on the connection line duration of low frequency signal transmission to switch to the duration weak point that is connected with described low frequency signal generation device than described high/low frequency link diverter switch, and a protection time slot is respectively arranged before transmission and after the transmission.
14. vehicle as claimed in claim 12 is characterized in that, described tyre assembly is fastened on the vehicle hub, presses close to the inner ring of tire, comprising:
The low frequency receiving element receives low frequency signal;
The high-frequency emission unit, the emission high-frequency signal;
Tire pressure/tire temperature sensor, gas in the contact tire detects tire pressure/tire temperature;
Processor, link to each other with described low frequency receiving element, high-frequency emission unit and tire pressure/tire temperature sensor, instruct according to the low frequency of transmitting through dual-mode antenna that comes self-controller that receives by described low frequency receiving element, control sensor tire pressure/tire temperature, and tire pressure/tire temperature information is sent to dual-mode antenna and is transmitted to controller by the high-frequency emission unit; And battery, be above-mentioned each parts power supply.
15. vehicle as claimed in claim 14 is characterized in that, described dual-mode antenna is installed on the wheel cover of vehicle, comprising:
The high frequency Transmit-Receive Unit, reception/demodulation high-frequency signal;
The low frequency Transmit-Receive Unit, the emission low frequency signal;
The two-way signaling commutation circuit, commutation circuit connects described connection line, and switchably connect described high frequency Transmit-Receive Unit and low frequency Transmit-Receive Unit, when switching to high frequency Transmit-Receive Unit and connection line and couple on connection line transmission demodulation code stream signal, on connection line, transmit low frequency signal when low frequency Transmit-Receive Unit and connection line couple when switching to.
16. vehicle as claimed in claim 15 is characterized in that, the low frequency Transmit-Receive Unit of the dual-mode antenna that described each group is corresponding and the low frequency receiving element of tyre assembly are realized communicating by letter by low frequency magnetic field; And corresponding dual-mode antenna and the tyre assembly of described each group is arranged in parallel, promptly the low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of corresponding dual-mode antenna and tyre assembly is along magnetic line of force direction keeping parallelism in the tire rotary course, and its medium and low frequency Transmit-Receive Unit and low frequency receiving element are coils.
17. vehicle as claimed in claim 12 is characterized in that, described display module is placed on the instrument board of vehicle, comprises a viewing area.
18. vehicle as claimed in claim 12 is characterized in that, dual-mode antenna has wheel limit demodulation function, and the connection line between described controller and dual-mode antenna is common shielding conductor or twisted-pair feeder.
19. a tire pressure/temperature monitoring method is characterized in that, sends the low frequency instruction and receive the high-frequency signal that comprises tire pressure/tire temperature state information on same connection line in time-multiplexed mode, comprising:
Switch the connection line state to the state that transmits low frequency signal, on connection line, send instruction to a dual-mode antenna with low frequency signal by a controller;
Dual-mode antenna is sent to a tyre assembly to instruction with the low frequency magnetic field signal form, requires to carry out tire pressure/tire temperature and detects;
Tyre assembly carries out tire pressure/tire temperature and detects, and with high-frequency signal the tire pressure/tire temperature state information of monitoring is sent to dual-mode antenna;
Switch the state of connection line to the carry high frequency restituted signal, dual-mode antenna comprises the tire condition code stream of tire pressure/tire temperature state information to high-frequency signal demodulation and transmission to controller;
Controller obtains the tire condition code stream decoding tire pressure/tire temperature state information and is sent to a display module to show;
During vehicle take-offs, carry out above-mentioned step repeatedly.
20. tire pressure/temperature monitoring method as claimed in claim 19 is characterized in that,
Be used to control the instruction of described dual-mode antenna and tyre assembly when switching connection line when transmitting the state of low frequency signal, producing, and be modulated into low frequency signal, on connection line, transmit;
When switching connection line, receive high-frequency signal, and therefrom demodulate the tire condition code stream that comprises tire pressure/tire temperature state information to the state of carry high frequency restituted signal;
Described tyre assembly and controller are operated under " sleeping/waking-transmission/affirmation " pattern.
21. tire pressure/temperature monitoring method as claimed in claim 20, it is characterized in that, periodically between the state of state that transmits low frequency signal and carry high frequency restituted signal, switch automatically, and the duration of emission low frequency signal is shorter than the duration of switching connection line to the state that transmits low frequency signal;
Described controller, tyre assembly and antenna module use identity ID separately to be indicated, described " sleeping/waking-emission/affirmation " pattern realizes the automatic foundation of " principal and subordinate " relation between tyre assembly and the controller, be the automatic identification of tyre assembly identity, tire location and controller identity ID, after recognizing each other and finish, described tyre assembly and controller be combined into fixing principal and subordinate's function combinations, its middle controller is main, tyre assembly be from.
22. tire pressure/temperature monitoring method as claimed in claim 21 is characterized in that, when switching, is provided with the protection time slot, does not transmit information in the protection time slot.
23. tire pressure/temperature monitoring method as claimed in claim 21 is characterized in that, it is shorter than the duration of emission low frequency signal to the duration of transmitting low frequency signal to switch connection line, and a protection time slot is respectively arranged before transmission and after the transmission.
24. tire pressure/temperature monitoring method as claimed in claim 19, it is characterized in that, dual-mode antenna and tyre assembly are arranged in parallel, promptly the low frequency receiving element axis of the low frequency Transmit-Receive Unit axis of dual-mode antenna and tyre assembly is along magnetic line of force direction keeping parallelism in the tire rotary course, and its medium and low frequency Transmit-Receive Unit and low frequency receiving element are coils.
25. tire pressure/temperature monitoring method as claimed in claim 24 is characterized in that using the two-way complex method of low-and high-frequency between dual-mode antenna and the tyre assembly, described high-frequency signal is 433.92MHz, and described low frequency signal is 125KHz.
26. tire pressure/temperature monitoring method as claimed in claim 19, described dual-mode antenna have wheel limit demodulation function, the connection line between described controller and dual-mode antenna uses common shielding conductor or twisted-pair feeder.
CNB2006100741589A 2005-07-15 2006-03-27 Tyre pressurel temperature monitoring system and automobile therewith Active CN100466758C (en)

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Patentee before: Dazhang Automobile Co., Ltd., Shanghai