WO1994001787A1 - Vehicular distance measuring system with integral mirror display - Google Patents
Vehicular distance measuring system with integral mirror display Download PDFInfo
- Publication number
- WO1994001787A1 WO1994001787A1 PCT/US1993/006345 US9306345W WO9401787A1 WO 1994001787 A1 WO1994001787 A1 WO 1994001787A1 US 9306345 W US9306345 W US 9306345W WO 9401787 A1 WO9401787 A1 WO 9401787A1
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- WO
- WIPO (PCT)
- Prior art keywords
- distance
- display
- vehicular
- signal
- distance measuring
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0017—Devices integrating an element dedicated to another function
- B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/002—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle
- B60Q9/004—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle using wave sensors
- B60Q9/005—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle using wave sensors using a video camera
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/002—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle
- B60Q9/007—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for parking purposes, e.g. for warning the driver that his vehicle has contacted or is about to contact an obstacle providing information about the distance to an obstacle, e.g. varying sound
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/521—Constructional features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/64—Luminous indications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
- B60R2300/101—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using cameras with adjustable capturing direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
- B60R2300/103—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using camera systems provided with artificial illumination device, e.g. IR light source
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
- B60R2300/105—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using multiple cameras
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
- B60R2300/106—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using night vision cameras
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/20—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of display used
- B60R2300/207—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of display used using multi-purpose displays, e.g. camera image and navigation or video on same display
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/30—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing
- B60R2300/301—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing combining image information with other obstacle sensor information, e.g. using RADAR/LIDAR/SONAR sensors for estimating risk of collision
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/30—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing
- B60R2300/303—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing using joined images, e.g. multiple camera images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/80—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement
- B60R2300/802—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for monitoring and displaying vehicle exterior blind spot views
- B60R2300/8026—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for monitoring and displaying vehicle exterior blind spot views in addition to a rear-view mirror system
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/80—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement
- B60R2300/8053—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for bad weather conditions or night vision
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/86—Combinations of sonar systems with lidar systems; Combinations of sonar systems with systems not using wave reflection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2015/937—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details
- G01S2015/938—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details in the bumper area
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/785—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
- G01S3/786—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system the desired condition being maintained automatically
- G01S3/7864—T.V. type tracking systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52004—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S367/00—Communications, electrical: acoustic wave systems and devices
- Y10S367/909—Collision avoidance
Definitions
- the system relates generally to electronic distance measuring systems and, more specifically, to an ultrasonic vehicular distance measuring system having a numeric distance display integrated into a vehicle rear view mirror.
- Mirrors further limit visual clues necessary for operator judgment of distance to an obstruction by limiting operator depth perception. This is a particular problem when backing a vehicle when the operator requires accurate distance information to maneuver a vehicle (e.g., a semi-tractor trailer) toward an obstruction such as a loading dock. Because of the relatively large distance between the operator and the rear of the vehicle, smaller obstructions may go unnoticed. This is also true in blind areas one either side of a vehicle where direct driver observation is not possible and mirror systems provide incomplete coverage.
- Electronic obstruction detecting and ranging systems use ultrasonic, radar and infrared emitters and receivers to bounce energy off an obstruction. the systems measure the time required for the emitted energy to travel to and from the obstruction to determine a distance to the obstruction.
- the calculated distance is displayed on a • three digit display mounted on a dashboard of the vehicle.
- the system includes ultrasonic transmitting/receiving units, a control unit and a digital display unit.
- Tendler U.S. Patent No. 4,937,796 describes a method and apparatus for providing a voice alert to a vehicle operator.
- the apparatus uses sonar to detect a distance from the rear of a vehicle to a structure such as a loading dock to which the vehicle is being backed.
- a device converts a detected range into an audible call out of the distance from the back of the vehicle to the structure.
- Naruse U.S. Patent No. 4,674,073 describes an apparatus for use in a vehicle for ultrasonically locating and ranging an object in relation to the vehicle.
- a plurality of ultrasonic transmitting and receiving elements are alternately arranged in a linear array and sequentially activated to detect and locate an object.
- a digital display shows the location and distance to a detected object.
- Chev U.S. Patent No. 4,626,850 describes an apparatus for use in a vehicle for ultrasonically locating and ranging an object in the vicinity of the vehicle.
- An ultrasonic transducer is rotated in azimuth to scan an area for objects. Audio and visual display of distance and direction to a detected object are provided.
- an object of the invention is to provide an vehicular digital distance display system for providing precise obstruction distance information to an operator without requiring the operator to divert attention away from other visual systems .
- Another object of the invention is to provide an digital distance display system usable with tractor- trailer combinations and other vehicles having an obstructed rear view.
- Another object of the invention is to provide a digital distance display system which minimizes operator distraction until an obstruction is detected within a predetermined hazard or threshold range.
- Another object of the invention is to provide a non-obtrusive vehicular mount for a distance measuring sensor.
- a vehicular distance measuring system includes a distance measuring device for detecting a distance to an object and, in response, supplying a distance signal.
- a display includes (i) a vehicular mirror having an image reflecting surface with a transparent window portion located therein, and (ii) a digital display mounted on the vehicular mirror and viewable through the window portion. The digital display is responsive to the distance signal for displaying the detected distance to the object.
- the distance measuring device includes a comparator for comparing the distance to the object with a predetermined threshold distance and, in response, supplying a display unblank signal.
- the digital display is responsive to the display unblank signal for selectively blanking the digital display and displaying the detected distance to the object.
- the display includes an illumination device such as light emitting diodes (LEDs) responsive to the display unblank signal for illuminating the digital display.
- the distance measuring device includes an ultrasonic transmitter and receiver, a timing circuit and a distance calculating processor.
- the ultrasonic transmitter is responsive to a transmit signal for emitting an ultrasonic wave.
- the ultrasonic receiver receives a reflected ultrasonic wave and, in response, supplies a received signal.
- the timing circuit measures a time period between the emission of the ultrasonic wave by the ultrasonic transmitter and reception of the reflected ultrasonic wave by the ultrasonic receiver. In response to the measured time period, the distance conversion processor supplies the distance signal to the display.
- the ultrasonic transmitter and receiver are contained within a vehicle light assembly such as a taillight assembly.
- the taillight assembly includes a shell with a bulb or other light emitting means mounted in the shell for supplying an externally perceptible visible light.
- a lens is secured to the shell for transmitting the visible light and the ultrasonic wave.
- the digital display includes a binary-coded-decimal (BCD) decoder receiving the distance signal and, in response, supplies a display driver signal.
- a numeric display is responsive to the display driver signal for displaying the detected distance to the object.
- the numeric display may comprise a pair of seven-segment liquid crystal displays (LCDs) or light emitting diodes (LEDs.)
- the display includes a mount for attaching the display to an outer portion of a vehicle.
- a heater is provided to electrically heat the vehicular mirror to defrost and/or defog the mirror and the display.
- a vehicular distance measuring system includes a distance measuring device having (i) a first sensor channel for detecting a distance to an object located in a first space and, in response, supplying a first sensor signal, and (ii) a processor responsive to the first sensor channel for supplying a first distance signal.
- a distance display system includes (i) a vehicular rear view mirror having an image reflecting surface and a first transparent window located in a portion of the image reflecting surface, and (ii) a first numeric display mounted on the vehicular rear view mirror. The numeric display is visible to a vehicle operator through the first transparent window and is responsive to the first distance signal for displaying the detected distance to the object to the operator.
- the processor supplies an unblank display signal to the numeric display in response to detecting the object within a predetermined distance, the first numeric display being responsive to the unblank display signal for selectively blanking and displaying the detected distance.
- the distance display system includes a display illumination device responsive to the unblank display signal from the distance measuring means for illuminating the numeric display.
- the first numeric display may be selectively blanked in response to the unblank display signal in response to a detected distance greater than the predetermined distance while displaying a detected distance less than the predetermined distance.
- the vehicular distance measuring system includes a second channel to detect obstructions in a second area distinct from the first.
- the distance measuring device includes a second sensor channel for detecting a distance to an object located in a second space and, in response, supplies a second sensor signal.
- the processor is responsive to the second sensor channel for supplying a second distance signal to a second numeric display device mounted in the vehicle mirror.
- a combination vehicular light and sensor housing includes a vehicular mountable shell with a light emitting element mounted in the shell for supplying visible light. A lamp socket and bracket are provided for mounting the light emitting element in the shell.
- a transducer is mounted in the shell spaced from the lamp socket for emitting and receiving a probe signal used to measure a distance.
- An optically translucent lens is mounted to the shell for transmitting the visible r light and the probe signal in a desired direction.
- the lens may include an aperture through which the probe signal is transmitted and echo signals are received.
- probe signal uses ultrasonic wave energy to detect and range an object.
- the lens may be in the form of a clear or colored plastic cover substantially transparent to the ultrasonic wave energy and translucent to the visible light.
- the lens may include a series of concentric ridges forming a Freznel lens.
- Figure 1 is a side view of a vehicular distance measuring system according to the invention installed in a vehicle.
- Figure 2 is a plan view of the vehicle of Figure 1 including the vehicular distance measuring system according to the invention.
- Figure 3 is a view of major components forming the vehicular distance measuring system according to the invention.
- Figure 4 is a front view of a mirror system according to the invention including a vehicle side view mirror and a pair of integral digital distance displays.
- Figure 5 is a partial sectional view of the mirror system of Figure 4.
- Figure 6 is a front view of an alternate mirror system according to the invention.
- Figure 7A is a front view of an ultrasonic transducer.
- Figure 7B is a sectional side view of the ultrasonic transducer of figure 7A.
- Figure 7C is a rear view of the ultrasonic transducer of figure 7A.
- Figure 7D is a sectional top view of the ultrasonic transducer of figure 7A.
- Figure 8 is a perspective view of a sonic transmitter/receiver unit.
- Figure 9a is a partial front sectional view of a ultrasonic sensor enclosure.
- Figure 9b is a sectional view of the enclosure of Figure 9a.
- Figure 9c is another sectional view of the enclosure of Figure 9a.
- Figure 10a is a front view of an ultrasonic sensor back panel.
- Figure 10b is a bottom sectional view of the back panel of Figure 10a.
- Figure 11a is a front view of an ultrasonic mounting bracket.
- Figure lib is a bottom view of the mounting bracket of Figure 11a.
- Figure lie is a side view of the mounting bracket of Figure 11a.
- Figure 12a is a front view of an ultrasonic sensor front panel.
- Figures 12b and 12c are sectional views of the front panel of Figure 11a.
- Figure 13a is a front view of a vehicle taillight assembly with lens cover removed to show integral ultrasonic transducer installed.
- Figure 13b is a partial sectional view of the vehicle taillight assembly of figure 13a with lens cover installed.
- Figure 14a is a rear view of a vehicle with the vehicle taillight assembly of figure 13a installed.
- Figure 14b is a partial side view of the vehicle of figure 14a.
- Figure 15a is a side view of a connection box according to the invention.
- Figure 15b is a view of another side of the connection box of Figure 15a.
- Figure 15c is a front view of the connection box of Figures 15a and 15b.
- Figure 16 is a schematic diagram of the controller and display electronics of the vehicular distance measuring system according to the invention.
- Figure 17 is a schematic diagram of the ultrasonic transducer and ultrasonic receiver and transmitter circuitry according to the invention.
- a vehicle 20 includes a combination of a tractor 22 and trailer 24.
- a plurality of transceivers 60 functioning as obstruction distance sensors are mounted on a rear bumper 26 of vehicle 20.
- the transmitters/receivers emit an ultrasonic acoustic energy wave having a frequency of 40 to 50 kiloHertz (kHz) rearward from the vehicle into a detection space immediately behind the vehicle.
- Mirror display system 40 includes a conventional reflective side view mirror with a digital display mounted thereon. The digital display is visible through a transparent window in the mirror for indicating distance to a detected obstruction. //
- Each transceiver 60 emits ultrasonic acoustic energy in a conical pattern.
- a linear array 62 of transceivers 60 is mounted along bumper 26 as shown in Figure 2 to achieve a desired rearward obstruction detection space.
- the transceiver 60 is wired in parallel to simultaneously emit a pulse of ultrasonic acoustic energy and provide overlapping receive capability of a return ultrasonic echo signal.
- Rear array 62 of transceivers 60 in combination with associated processing and control circuitry described below provides complete sensor coverage to detect and provide range information to obstructions located within ten feet of the rear of the vehicle. This information is provided to the vehicle operator by the digital display visible in mirror display system 40 for collision avoidance. For example, the vehicle operator can back vehicle 20 to a bay or dock while visually checking for obstructions in mirror display system 40 and simultaneously observing the distance to the bay or dock indicated by the digital display.
- transceivers can be mounted along a side of the vehicle to provide augmented collision avoidance.
- Side facing sensor array 64 includes three transceivers 60 for detecting obstructions along the right side of vehicle 20. The array is oriented to detect vehicles in a space not readily visible to the vehicle operator and provides distance sensor information to a second channel of the processing and control circuitry for display on a second digital display of mirror display system 40.
- the vehicular distance measuring system includes three major components as shown in Figure 3: mirror display system 40 with integral digital display, one or /*- more ultrasonic transceivers 60 and connection box 80.
- mirror display system 40 includes a reflective "West Coast Style" side view mirror 41, approximately seven inches wide by sixteen inches high with a deep drawn stainless steel back.
- Mirror element 42 is either first surface chrome or silvered glass sealed in a vinyl channel to prevent component damage and to absorb shock and road vibration.
- Mirror display system 40 includes one or two back lighted three digit LCD displays 44,46 visible through clear windows in the mirror element. The mirror may be heated to defog or deice the unit.
- Connection box 80 supplies power to LCD display 44,46 and back-lights (not shown) and includes circuitry for operating transceiver 60 to detect and calculate a range of obstructions .
- the connection box includes a conventional microprocess or microcontroller for operating and receiving echo signals from the transceiver 60, calculating a range to a sensed object, comparing the calculated range with predetermined display activation maximum distance values and, in response, activating and supplying range data signals to respective displays 44 and 46.
- Connection box 80 accommodates up to two channels of sensor inputs for sensor located on the rear and one side of the vehicle. Each channel controls one or more transceivers 60 for detecting obstructions behind or to one side of the vehicle. Multiple transceiver units provide inputs to a channel to increase lateral coverage of the system. As shown in Figure 2, multiple transceivers 60 are located along the rear and side of trailer 24 to insure full sensor coverage. The transceiver unit of both channels transmit in parallel to emit ultrasonic acoustic waves. Return ultrasonic echo signals are separately supplied by each group of sensors to the associated channel and separately processes and displayed on a respective LCD display 44, 46. Ultrasonic transducers constituting transceivers 60 are commercially available, for example, from the Polaroid Corporation.
- Each unit includes an ultrasonic transmitter for emitting an ultrasonic signal of about 50 kHz and a receiver for sensing a reflection of the emitted signal.
- the connection box 80 measures the time difference and calculates a distance to a sensed obstruction. If the sensed obstruction is calculated to be within a predetermined distance specified for that sensor channel, the respective LCD display and back light are activated and the distance to the obstruction is displayed.
- Ultrasonic transceivers 60 are connected in series or are "daisey chained" by interconnect cables 66 to form a first channel of sensors mounted along the rear bumper of the vehicle in linear array 62.
- the first channel of sensors is connected by cable 68a to connection box 80 mounted in the cab of the vehicle tractor 22.
- Connection box 80 includes a controller for driving transceivers 60 to emit an ultrasonic pulse, receiving a return ultrasonic echo, computing a distance to an obstruction reflecting the ultrasonic wave, and supplying a binary coded decimal (BCD) data signal indicating the computed distance.
- a second array of ultrasonic transceiver (not shown) forming a second sensor channel is connected to connection box 80 by cable 68b.
- Multiple LCD displays 44a, 46a are located along opposite side of the mirror element 42a and are visible through transparent windows formed therein.
- An ultrasonic transducer 72 is shown in figures 7A-7D.
- the unit is relatively small in size, measuring approximately 1*$ inches wide by 1 inch high by h inch deep.
- the transducer functions as a loudspeaker to emit a pulse of ultrasonic energy and as an electrostatic microphone to receive the reflected signal or "echo.”
- the transducer may be mounted as shown in Figure 8 to provide a complete ultrasonic transceiver 60.
- transceiver 60 includes housing 70 with ultrasonic transducer 72 mounted therein.
- Housing 70 is made of conventional sheet metal and includes a box shaped front cover 71 ( Figures 9a-9c) having an open back and an opposite front.
- a large square central aperture in the front is covered with an acoustically transparent screen 76 to protect transducer 72 from foreign objects.
- Cover 71 engages a peripheral lip of square ultrasonic sensor back panel 72 ( Figures 10a and 10b) and is secured to sensor back panel 72 using bolts inserted through holes 73 of cover 71 engaging corresponding threaded apertures 75 in the lip of back panel 72.
- Sensor back panel 72 is secured to a vehicle by through-bolts 78.
- housing 70 may be attached to a vehicle using L-shaped ultrasonic mounting bracket 79 ( Figures lla-llc) which engages and secures to sensor back panel 72 using through bolts 78.
- Transducer 72 is centrally positioned within housing 70 by front panel 74.
- front panel 74 is formed in the shape of a square with a large central square recessed portion.
- An oval aperture is formed in the recess portion with a plurality of holes formed thereabout for securing a transceiver to the panel.
- the ultrasonic transducer is relatively small, it may instead be incorporated into an existing vehicle structure with minimal modification.
- Light units such as taillight assemblies provide environmental protection for the transducer.
- the assemblies include an ultrasonic transparent plastic covering as shown in Figures 13a and 13b or an aperture through the plastic.
- Taillight assembly 130 includes a metallic taillight shell 132 with a peripheral lip for mounting the assembly in an aperture formed in the body of a vehicle.
- a socket lamp 134 is mounted to shell 132 by a bracket.
- An incandescent lamp 136 is installed in lamp socket 134 and is supplied with electric power through insulated electric wire 138 to illuminate lamp 136.
- Transducer 72 is installed below lamp 136 and is supported directly behind lens cover 140 by a conventional bracket member (not shown.)
- Lens 140 may be a multifaceted optically translucent plastic material for projecting light emitted from lamp 136.
- the lens may form a Freznel lens to further direct and concentrate light from lamp 136.
- the plastic may be optically clear, partially opaque or colored as is conventional for vehicle taillights and running lights.
- a suitable plastic type and thickness is chosen.
- an aperture 142 through the plastic or a window area of a suitable ultrasonic transparent material, such as a fine screen material, may be provided in the lens to minimize attenuation of the transmitted and received signals. / (,
- vehicle 150 includes a taillight assembly 130 mounted in the rear portion 152 of the vehicle.
- the vehicular measuring system may be readily installed in a vehicle by either modifying or replacing an existing taillight to incorporate an ultrasonic transducer without requiring modifications to the structure of the vehicle.
- Including an ultrasonic transducer in a taillight assembly 130 or running light assembly 154 on a side of the vehicle further accommodates optimal placement of the transducers without removing or relocating existing vehicle lighting.
- connection box 80 includes a first side face 82 including connectors 84 and 86 for connecting electronics contained within the connection box to first and second daisey chained channels of transceivers.
- An opposite side panel 88 includes a connector 90 accepting cable 82 for supplying signals to mirror display system 40.
- Connector 92 is used to supply d.c. power to the connection box which distributes power to the other systems as required.
- a front panel 94 includes a power fuse holder 96 and a display mode switch 98 for selecting digital display readings in either feet or meters.
- the control electronics housed in connector box 80 and the display electronics of the mirror display system are shown in the schematic diagram of Figure 16.
- the controller and display electronics 100 of the vehicular distance measuring system includes a conventional microprocessor 102, binary-coded-decimal (BCD) to seven segment converters/drivers (display drivers) 110-116 and seven-segment liquid crystal displays (LCDs) 120.
- BCD binary-coded-decimal
- LCDs seven segment liquid crystal displays
- Microprocessor 102 includes an on-chip erasable programmable read only memory (EPROM) storing a set of operating instructions, random access memory (RAM) for temporary storage of operating data, a central processing unit for performing arithmetic and logic operations, and first and second parallel input/output (I/O) ports PA0-PA7 and PB0-PB5.
- First I/O port PA0- PA7 of microprocessor 102 includes I/O terminals PA0- PA3 supplying parallel MOS level BCD data signals to display drivers 110-116. The remaining I/O terminals PA7-PA4 of the first I/O port are connected to respective display enable terminals of display drivers 110-116.
- Output terminals A-G of display drivers 110- 116 are connected to respective segments of dual seven- segment LCD displays 120 and 122.
- a first I/O terminal PB0 of the second output port is connected in parallel to light emitting diodes (LEDs) 144 through drivers 140 and 142.
- LEDs 144 are mounted in the mirror display system behind LCD displays 120 and 122 to illuminate the displays in response to detection of an obstruction within a predetermined threshold distance.
- I/O terminal PB1 of the second output port provides a clock signal to display drivers 110-116 and LCD displays 120 and 122.
- the clock signal is used to synchronize data transfers from the first output port of microprocessor 102 to display drivers 110-116 and LCD displays 120 and 122.
- I/O terminal PB2 provides a transmit control signal under program control to each of the transceivers through bipolar transistor Ql .
- I/O terminal PB3 receives a logic signal from display mode switch 98 through amplifier 136.
- Microprocessor 102 periodically reads the logic level at I/O terminal PB3 and scales a computed distance to a detected obstruction to selectively display the distance in either feet or meters.
- I/O terminals PB5 and PB4 receive respective echo signals ECH01 and ECH02 from first and second sensor channels .
- Each sensor channel includes a comparator 130 receiving at an inverting input an echo signal from a respective ultrasonic transceivers in parallel comprising a sensor channel.
- a noise suppression capacitor is connected from the inverting input terminal of comparators 130 to ground.
- a non-inverting input of the comparator is connected to a reference voltage. If any of the transceivers detect an ultrasonic return echo signal, current is drawn through pull-up resistor 134 connected to the inverting input terminal causing the voltage level applied to the inverting terminal to decrease, i.e., go low with respect to the reference voltage.
- the output from comparator 130 is supplied to invertor 132 which reinverts the signal level and supplies a respective echo signal to input terminals PB5 and PB4.
- voltage regulator 160 Power to all components of electronics 100 is provided by voltage regulator 160. Nominal vehicle 12 volt power is supplied to voltage regulator 160 which supplied five volt MOS operating voltage to system components. Twelve volt direct current is supplied directly to electrical heater units of the mirror display units .
- transducer transmit controller 202 which receives a transmit control signal from controller and display electronics 100 and, in II response, provides an ultrasonic output signal of a predetermined duration to transducer 200 through output transistor 204 and output transformer 206.
- Ultrasonic waves received by transducer 200 are converted to electrical signals and supplied to signal processor 212.
- Signal processor 212 is responsive to a frequency set by tuned circuit 214 to detect a return echo corresponding to the frequency of the transmitted signal.
- signal processor 212 supplies a detector signal to an inverting input of comparator 216.
- the output of comparator 216 is provided in parallel with the output of other transmitters of the channel to controller and display electronics 100.
- microprocessor 102 periodically supplies a transmit control signal in parallel to ultrasonic transceivers of both channels and initiates a timer.
- each transceiver In response to the transmit control signal, the transmitters of each transceiver generates an ultrasonic signal causing the respective transducers to emit ultrasonic acoustic wave energy toward areas of potential obstructions or hazards. The acoustic wave energy is bounced off of obstructions, creating an acoustic echo receivable by the transducer. In response to receiving an acoustic echo, the transducer provides a corresponding electrical signal to signal processor 212. The detector output from signal processor 212 is supplied to microprocessor 102 on a corresponding channel. Microprocessor 102 alternately receives signals from each of the channels and, using the timer, determines a round trip time required for the acoustic wave energy to travel to, and return from the obstruction. The microprocessor translates the time into a distance and compares the computed distance to a predetermined threshold distance value for that channel .
- the system has an accuracy and display resolution of one-tenth of a foot over an operating range of 1.5 inches to over ten feet. Distances to objects over ten feet from the vehicle are suppressed in view of system range constraints and to avoid generating spurious warning indications to the operator.
- microprocessor 102 If the computed distance is within a display range corresponding to the threshold distance, microprocessor 102 provides a display output signal indicating distance to the obstruction to the corresponding display channel in the selected units, i.e., feet or meters . If no obstruction to the corresponding display channel is detected within the threshold distance for either channel, both displays are blanked and the illumination therefor is extinguished.
- the inventions include electric heating elements in the mirror display units to defrost, defog and deice the mirrors and to maintain a satisfactory operational environment for the LCD displays .
- Another feature of the invention includes pellicle mirror portions forming half silvered display windows in the mirror whereby the LCD displays are only visible when back lighted. Blanked displays, being darker than the ambient light level, would not be visible so that the vehicle operator would not be distracted by the display and the full surface area of the mirror unit would constitute usable image area .
- the invention provides an obstruction detection and ranging system including a mirror display unit providing conventional rear view vision to a driver in combination with an integrated digital display.
- the digital display is viewable through an at optical window in the mirror whereby the operator does not redirect his or her vision away from the mirror to observe the display. Because the display is blanked when no object is detected within a predetermined distance from the vehicle, the operator is not distracted by spurious indications on the display.
- mirror display system is described using LCDs. light emitting diode displays may be substituted thereby eliminating the need for separate backlighting LEDs.
- system is described including two channels of sensors, fewer or greater number of channels may be incorporated to provide a desired hazard warning detection zone.
- ultrasonic ranging is described, other ranging systems may be used including radio detection and ranging (radar), infrared and radio transponder systems.
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Closed-Circuit Television Systems (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU46648/93A AU4664893A (en) | 1992-07-02 | 1993-07-02 | Vehicular distance measuring system with integral mirror display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/908,267 US5303205A (en) | 1990-02-26 | 1992-07-02 | Vehicular distance measuring system with integral mirror display |
US908,267 | 1992-07-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994001787A1 true WO1994001787A1 (en) | 1994-01-20 |
Family
ID=25425480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1993/006345 WO1994001787A1 (en) | 1992-07-02 | 1993-07-02 | Vehicular distance measuring system with integral mirror display |
Country Status (5)
Country | Link |
---|---|
US (2) | US5303205A (en) |
CN (1) | CN1086016A (en) |
AU (1) | AU4664893A (en) |
IL (1) | IL106210A0 (en) |
WO (1) | WO1994001787A1 (en) |
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CN1086016A (en) | 1994-04-27 |
IL106210A0 (en) | 1993-11-15 |
US5793308A (en) | 1998-08-11 |
US5303205A (en) | 1994-04-12 |
AU4664893A (en) | 1994-01-31 |
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