CN105067079A - Liquid level detection device and control method thereof - Google Patents
Liquid level detection device and control method thereof Download PDFInfo
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- CN105067079A CN105067079A CN201510482588.3A CN201510482588A CN105067079A CN 105067079 A CN105067079 A CN 105067079A CN 201510482588 A CN201510482588 A CN 201510482588A CN 105067079 A CN105067079 A CN 105067079A
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Abstract
The invention discloses a liquid level detection device and a control method thereof. The liquid level detection device comprises a shell, a single-chip microcomputer, a storage device, an alarming device, a displayer, a temperature sensor and a liquid level sensor, wherein the single-chip microcomputer and the storage device are arranged in the shell, the alarming device and the displayer are arranged on the shell, and the liquid level sensor is used for measuring the water level. The liquid level sensor comprises an inductance coil and a silicon steel bar which is arranged in the inductance coil and can move vertically relative to the inductance coil. The temperature sensor is arranged on a copper wire winding of the inductance coil. The liquid level detection device has the advantages of being high in detection precision, high in stability and reliability and wide in application range, and the limitation of the numbers of turns and the wire diameter of the induction coil are avoided.
Description
Technical field
The present invention relates to sensor technical field, especially relate to a kind of accuracy of detection high, cost is low, the liquid level detection device that security is good and control method thereof.
Background technology
There is inconvenient debugging in existing Liquid level instrument, need the slip-stick artist of specialty, the signal drift of circuit is more serious, the collection of signal is unstable, and precision is low, and production cost is high, the realization of function is complicated and unstable, the number of turns of coil and wire diameter is had to the deficiency of strict requirement.
Chinese patent mandate publication number: CN102650538A, authorize publication date on August 29th, 2012, disclose a kind of automobile fuel consumption combination metering system and oil tank liquid level transducer calibration method, mainly comprise: fuel tank, fuel tank flowline, fuel consumption meter for automobile data line, fuel consumption meter for automobile, fuel consumption meter for automobile flowline, scavenge pipe, fuel pump, oil tank liquid level sensor, oil tank liquid level sensor data cable, single-chip data processor, engine, single-chip data processor is connected with automobile fuel consumption instrument data line and oil tank liquid level sensor data cable simultaneously, the oil consumption of real-time calculating and vehicle oil wear indication gauge and the oil mass of case liquid level sensor.The weak point of this invention is that accuracy of detection is low, cannot find sensor fault.
Summary of the invention
Goal of the invention of the present invention is the deficiency that the accuracy of detection in order to overcome Liquid level instrument of the prior art is low, cannot find sensor fault, and provide a kind of accuracy of detection high, cost is low, the liquid level detection device that security is good and control method thereof.
To achieve these goals, the present invention is by the following technical solutions:
A kind of liquid level detection device, comprises housing, is located at the single-chip microcomputer in housing and storer, be located at the warning device on housing and display, temperature sensor and the liquid level sensor for measuring water level; Described liquid level sensor comprises telefault, the silicon steel that can move up and down relative to telefault be located in telefault is excellent, be located at the float of silicon steel rod lower end and the guide cylinder for holding silicon steel rod bottom and float, and guide cylinder lower end is provided with the opening that diameter is less than float diameter; Described temperature sensor is located on the copper cash winding of telefault; Single-chip microcomputer is electrically connected with warning device, telefault, storer, display and temperature sensor respectively.
Liquid level sensor of the present invention is for detecting the water level in boiler, the temperature of boiler is usually in the scope of 20 DEG C-250 DEG C, and the change of temperature can cause the drift detecting current value, therefore, invention increases the temperature sensor for detecting telefault temperature, and through 200 to 1000 tests, obtain temperature drift calibration coefficient table, be provided with the temperature relevant to the current value of the temperature T of telefault, detection signal in temperature drift calibration coefficient table and float calibration coefficient T1;
Along with the fluctuation of water level, silicon steel rod moves up and down in telefault, and telefault produces electric signal u (t); Setting initial time is a
0;
Temperature sensor detects the temperature T of telefault, and single-chip microcomputer gathers a
0a value X in moment u (t), single-chip microcomputer utilizes X, T to retrieve temperature drift calibration coefficient table, obtains the temperature drift calibration coefficient T1 corresponding with X; Single-chip microcomputer calculates and comprises a
0time be engraved in maximal value X2 and the minimum value X1 of u (t) in interior unit interval T2;
Single-chip microcomputer utilizes formula
Calculate and obtain the current detection value Z through correction of temperature drift;
As Z >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low.
Thus make the detection of water level more accurate, effectively prevent temperature, detect current value, transducer range lower limit Y1, transducer range upper limit Y2, the maximal value X2 of u (t) and minimum value X1 to the impact detecting electric current, accuracy of detection is high, stability and good reliability; To the size wide accommodation of telefault, be not subject to the restriction of the number of turns and wire diameter.
Therefore, the present invention have that accuracy of detection is high, stability and good reliability; Wide accommodation, is not subject to the feature of the number of turns of telefault and the restriction of wire diameter.
As preferably, also comprise wireless transceiver and booster circuit, wireless transceiver is electrically connected with single-chip microcomputer by booster circuit, and wireless transceiver is connected with mobile phone or computer wireless.
When water level is too high or water level is too low, while warning device sends warning message and display display alarm information, wireless transceiver can send wireless alarm signal to mobile phone or computer, thus makes long-range staff obtain the message of water level abnormality in time.
As preferably, also comprise status indicator lamp, status indicator lamp is electrically connected with single-chip microcomputer.During normal work, status indicator lamp display is green or blue; When water level is too high or water level is too low, the flicker of status indicator lamp redness.
As preferably, described alert process device comprises loudspeaker and hummer, and loudspeaker and hummer are all electrically connected with single-chip microcomputer.
A control method for liquid level detection device, comprises the steps:
(5-1) transducer range lower limit Y1 is provided with in storer, transducer range upper limit Y2, temperature drift calibration coefficient table, the current threshold W1 corresponding with water level lower limit and the current threshold W2 corresponding with water level higher limit; Be provided with the temperature relevant to the current value of the temperature T of telefault, detection signal in temperature drift calibration coefficient table and float calibration coefficient T1; Setting initial time is a
0;
(5-1-1) along with the fluctuation of water level, silicon steel rod moves up and down in telefault, and telefault produces electric signal u (t);
(5-2) temperature sensor detects the temperature T of telefault, and single-chip microcomputer gathers a
0a value X in moment u (t), single-chip microcomputer utilizes X, T to retrieve temperature drift calibration coefficient table, obtains the temperature drift calibration coefficient T1 corresponding with X; Single-chip microcomputer calculates and comprises a
0time be engraved in maximal value X2 and the minimum value X1 of u (t) in interior unit interval T2;
(5-3) single-chip microcomputer utilizes formula
Calculate and obtain the current detection value Z through correction of temperature drift; Z and current time store in memory by single-chip microcomputer;
(5-4) as Z >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z < W2, after interval time T2, make a
0value increase T2, return step (5-2).
As preferably, when working time of telefault more than 1 minute after, described step (5-4) is replaced by following step:
Single-chip microcomputer reads in storer the Z before the distance current time T2 time stored, and calculates and the mean value Z ' of Z before Z and the T2 time obtaining current time,
As Z ' >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z '≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z ' < W2, after interval time T2, make a
0value increase T2, return step (5-2).
Because the water level of boiler is in real time in fluctuation, the water level of actual measurement may be crest or wave base, the present invention gathers a value X of u (t) at interval of T2, calculate and the mean value Z ' of Z before Z and the T2 time obtaining current time, make the output of water level signal more level and smooth, and carry out the height of multilevel iudge water level with Z ', thus improve stability, the reliability of water level detecting.
As preferably, also comprise the steps: between step (5-1-1) and (5-2)
(7-1) initial value being provided with j in storer is the initial value of 1, i is 1, is provided with fault threshold E;
(7-2) single-chip microcomputer calculates the local maximum of u (t) and obtains coenvelope line u by cubic spline interpolation
up(t);
(7-3) calculate the local minimum of signal u (t) and obtain lower envelope line u by cubic spline interpolation
low(t);
(7-4) average envelope m is defined
1(t)=[u
up(t)+u
low(t)]/2;
(7-5) formula h is utilized
j(t)=u (t)-m
j(t) calculated difference h
j(t);
If (7-6) h
jt () does not meet IMF and sieves stop condition, make u (t)=h
jt (), j value increase by 1, returns step (7-2) to h
jt () proceeds to decompose; Work as h
jt () meets IMF and sieves stop condition, then obtain the 1st IMF component C of u (t) signal
1(t)=h
j(t);
(7-7) formula r is utilized
i(t)=u (t)-c
it () calculates residual components r
i(t);
(7-8) r is worked as
iwhen () does not meet decomposition stop condition t, make u (t)=r
it (), makes i value increase by 1, return step (7-2) to r
it () continues to decompose; When satisfied screening stop condition, if n1=i, obtain n1 IMF component c
i(t) and 1 residual components r
nt (), u (t) then can be expressed as
extract c
in number of sample value c of (t)
i(k), k=1,2 ..., N;
(7-9) single-chip microcomputer utilizes formula
calculate each component energy of u (t), compare each component energy E of u (t)
max, choose E
1, E
2..., E
nmiddle maximal value E
max, work as E
maxduring > E, the judgement of level sensor fault made by single-chip microcomputer, the information of display display level sensor fault, and warning device sends warning message; Single-chip Controlling liquid level sensor and temperature sensor quit work;
Work as E
maxduring≤E, proceed to step (5-2);
Wherein, the screening stop condition of (7-6), (7-8) adopts imitative Cauchy's test for convergence,
work as S
dduring < ε, screening stops, and ε is usually between 0.2 and 0.3, and T is the constant of setting; Decomposing stop condition is residual signal r
it () becomes monotonic quantity.
As preferably, T1 and X is inversely proportional to, and T1 and T is inversely proportional to.
As preferably, the span of T2 is 0.9 second to 1.2 seconds
As preferably, the span of Y1 is 3 milliamperes to 5 milliamperes, and the span of Y2 is 19 milliamperes to 23 milliamperes.
Therefore, the present invention has following beneficial effect: accuracy of detection is high, stability and good reliability; Wide accommodation, not by the number of turns of telefault and the restriction of wire diameter.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram of the present invention;
Fig. 2 is a kind of process flow diagram of embodiments of the invention 1.
In figure: single-chip microcomputer 1, storer 2, warning device 3, display 4, temperature sensor 5, liquid level sensor 6, telefault 7, silicon steel rod 8, wireless transceiver 9, booster circuit 10, status indicator lamp 11, loudspeaker 12, hummer 13, mobile phone 14.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1
Embodiment is as shown in Figure 1 a kind of liquid level detection device, comprises housing, is located at the single-chip microcomputer 1 in housing and storer 2, is located at the warning device 3 on housing and display 4, temperature sensor 5 and the liquid level sensor 6 for measuring water level; Liquid level sensor comprises telefault 7, the silicon steel rod 8 that can move up and down relative to telefault be located in telefault, be located at silicon steel rod lower end float and for holding silicon steel rod bottom and the guide cylinder of float, guide cylinder lower end is provided with the opening that diameter is less than float diameter; Described temperature sensor is located on the copper cash winding of telefault; Single-chip microcomputer is electrically connected with warning device, telefault, storer, display and temperature sensor respectively.
Also comprise wireless transceiver 9 and booster circuit 10, wireless transceiver is electrically connected with single-chip microcomputer by booster circuit, wireless transceiver and mobile phone 14 wireless connections.Also comprise status indicator lamp 11, status indicator lamp is electrically connected with single-chip microcomputer.
Alert process device comprises loudspeaker 12 and hummer 13, and loudspeaker and hummer are all electrically connected with single-chip microcomputer.
As shown in Figure 2, a kind of control method of liquid level detection device, comprises the steps:
Step 100, telefault produces electric signal
Transducer range lower limit Y1 is provided with, transducer range upper limit Y2, temperature drift calibration coefficient table, the current threshold W1 corresponding with water level lower limit and the current threshold W2 corresponding with water level higher limit in storer; Be provided with the temperature relevant to the current value of the temperature T of telefault, detection signal in temperature drift calibration coefficient table and float calibration coefficient T1; Setting initial time is a
0;
| T | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 |
| X | 10 | 11 | 11.8 | 12.5 | 13.1 | 13.6 | 14.2 | 14.7 | 15.2 | 15.6 | 15.9 | 16.3 | 16.5 | 16>8 |
| T1 | 1 | 0.909 | 0.847 | 0.800 | 0.763 | 0.735 | 0.704 | 0.680 | 0.658 | 0.641 | 0.629 | 0.613 | 0.606 | 0.595 |
Temperature drift calibration coefficient table
In temperature drift calibration coefficient table, the unit of T is DEG C, and the unit of X is mA;
Step 110, along with the fluctuation of water level, silicon steel rod moves up and down in telefault, and telefault produces electric signal u (t);
Step 200, obtains temperature drift calibration coefficient T1, the maximal value X2 of u (t) and minimum value X1 in unit interval T2=1 second
Temperature sensor detects the temperature T of telefault, and single-chip microcomputer gathers a
0a value X in moment u (t), single-chip microcomputer utilizes X, T to retrieve temperature drift calibration coefficient table, obtains the temperature drift calibration coefficient T1 corresponding with X; Single-chip microcomputer calculates and comprises a
0time be engraved in maximal value X2 and the minimum value X1 of u (t) in interior unit interval T2;
Step 300, calculates and obtains the current detection value Z through correction of temperature drift
Single-chip microcomputer utilizes formula
Calculate and obtain the current detection value Z through correction of temperature drift; Z and current time store in memory by single-chip microcomputer;
Step 400, the judgement of water level height and control
As Z >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z < W2, after interval time T2, make a
0value increase T2, return step 200.
In the present embodiment, Y1 is 4mA, Y2 is 20mA.
Embodiment 2
Embodiment 2 comprises all structures in embodiment 1 and step part, when working time of telefault more than 1 minute after, the step 400 of embodiment 1 is replaced by following step:
Single-chip microcomputer reads in storer the Z before the distance current time T2 time stored, and calculates and the mean value Z ' of Z before Z and the T2 time obtaining current time,
As Z ' >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z '≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z ' < W2, after interval time T2, make a
0value increase T2, return step 200.
Embodiment 3
Embodiment 3 comprises all structures in embodiment 1 and step part, also comprises the steps: between the step 110 of embodiment 1 and 200
(7-1) initial value being provided with j in storer is the initial value of 1, i is 1, is provided with fault threshold E;
(7-2) single-chip microcomputer calculates the local maximum of u (t) and obtains coenvelope line u by cubic spline interpolation
up(t);
(7-3) calculate the local minimum of signal u (t) and obtain lower envelope line u by cubic spline interpolation
low(t);
(7-4) average envelope m is defined
1(t)=[u
up(t)+u
low(t)]/2;
(7-5) formula h is utilized
j(t)=u (t)-m
j(t) calculated difference h
j(t);
If (7-6) h
jt () does not meet IMF and sieves stop condition, make u (t)=h
jt (), j value increase by 1, returns step (7-2) to h
jt () proceeds to decompose; Work as h
jt () meets IMF and sieves stop condition, then obtain the 1st IMF component c of u (t) signal
1(t)=h
j(t);
(7-7) formula r is utilized
i(t)=u (t)-c
it () calculates residual components r
i(t);
(7-8) r is worked as
iwhen () does not meet decomposition stop condition t, make u (t)=r
it (), makes i value increase by 1, return step (7-2) to r
it () continues to decompose; When satisfied screening stop condition, if n1=i, obtain n1 IMF component c
i(t) and 1 residual components r
nt (), u (t) then can be expressed as
extract c
in number of sample value c of (t)
i(k), k=1,2 ..., N;
(7-9) single-chip microcomputer utilizes formula
calculate each component energy of u (t), compare each component energy E of u (t)
max, choose E
1, E
2..., E
nmiddle maximal value E
max, work as E
maxduring > E, the judgement of level sensor fault made by single-chip microcomputer, the information of display display level sensor fault, and warning device sends warning message; Single-chip Controlling liquid level sensor and temperature sensor quit work;
Work as E
maxduring≤E, proceed to step 200;
Wherein, the screening stop condition of (7-6), (7-8) adopts imitative Cauchy's test for convergence,
work as S
dduring < ε, screening stops, and ε is usually between 0.2 and 0.3, and T is the constant of setting; Decomposing stop condition is residual signal r
it () becomes monotonic quantity.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (10)
1. a liquid level detection device, it is characterized in that, comprise housing, be located at the single-chip microcomputer (1) in housing and storer (2), be located at the warning device (3) on housing and display (4), temperature sensor (5) and the liquid level sensor (6) for measuring water level; Described liquid level sensor comprises telefault (7), the silicon steel rod (8) that can move up and down relative to telefault be located in telefault, be located at silicon steel rod lower end float and for holding silicon steel rod bottom and the guide cylinder of float, guide cylinder lower end is provided with the opening that diameter is less than float diameter; Described temperature sensor is located on the copper cash winding of telefault; Single-chip microcomputer is electrically connected with warning device, telefault, storer, display and temperature sensor respectively.
2. liquid level detection device according to claim 1, it is characterized in that, also comprise wireless transceiver (9) and booster circuit (10), wireless transceiver is electrically connected with single-chip microcomputer by booster circuit, and wireless transceiver is connected with mobile phone (14) or computer wireless.
3. liquid level detection device according to claim 1, is characterized in that, also comprise status indicator lamp (11), status indicator lamp is electrically connected with single-chip microcomputer.
4. the liquid level detection device according to claim 1 or 2 or 3, is characterized in that, described alert process device comprises loudspeaker (12) and hummer (13), and loudspeaker and hummer are all electrically connected with single-chip microcomputer.
5. be applicable to a control method for the liquid level detection device of claim 1, it is characterized in that, comprise the steps:
(5-1) transducer range lower limit Y1 is provided with in storer, transducer range upper limit Y2, temperature drift calibration coefficient table, the current threshold W1 corresponding with water level lower limit and the current threshold W2 corresponding with water level higher limit; Be provided with the temperature relevant to the current value of the temperature T of telefault, detection signal in temperature drift calibration coefficient table and float calibration coefficient T1; Setting initial time is a
0;
(5-1-1) along with the fluctuation of water level, silicon steel rod moves up and down in telefault, and telefault produces electric signal u (t);
(5-2) temperature sensor detects the temperature T of telefault, and single-chip microcomputer gathers a
0a value X in moment u (t), single-chip microcomputer utilizes X, T to retrieve temperature drift calibration coefficient table, obtains the temperature drift calibration coefficient T1 corresponding with X; Single-chip microcomputer calculates and comprises a
0time be engraved in maximal value X2 and the minimum value X1 of u (t) in interior unit interval T2;
(5-3) single-chip microcomputer utilizes formula
Calculate and obtain the current detection value Z through correction of temperature drift; Z and current time store in memory by single-chip microcomputer;
(5-4) as Z >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z < W2, after interval time T2, make a
0value increase T2, return step (5-2).
6. the control method of liquid level detection device according to claim 5, is characterized in that, when working time of telefault more than 1 minute after, described step (5-4) is replaced by following step:
Single-chip microcomputer reads in storer the Z before the distance current time T2 time stored, and calculates and the mean value Z ' of Z before Z and the T2 time obtaining current time,
As Z ' >=W2, Single-chip Controlling warning device is reported to the police, the information that display display water level is too high;
As Z '≤W1, Single-chip Controlling warning device is reported to the police, the information that display display water level is too low;
As W1 < Z ' < W2, after interval time T2, make a
0value increase T2, return step (5-2).
7. the control method of liquid level detection device according to claim 5, is characterized in that, also comprises the steps: between step (5-1-1) and (5-2)
(7-1) initial value being provided with j in storer is the initial value of 1, i is 1, is provided with fault threshold E;
(7-2) single-chip microcomputer calculates the local maximum of u (t) and obtains coenvelope line u by cubic spline interpolation
up(t);
(7-3) calculate the local minimum of signal u (t) and obtain lower envelope line u by cubic spline interpolation
low(t);
(7-4) average envelope m is defined
1(t)=[u
up(t)+u
low(t)]/2;
(7-5) formula h is utilized
j(t)=u (t)-m
j(t) calculated difference h
j(t);
If (7-6) h
jt () does not meet IMF and sieves stop condition, make u (t)=h
jt (), j value increase by 1, returns step (7-2) to h
jt () proceeds to decompose; Work as h
jt () meets IMF and sieves stop condition, then obtain the 1st IMF component c of u (t) signal
1(t)=h
j(t);
(7-7) formula r is utilized
i(t)=u (t)-c
it () calculates residual components r
i(t);
(7-8) r is worked as
iwhen () does not meet decomposition stop condition t, make u (t)=r
it (), makes i value increase by 1, return step (7-2) to r
it () continues to decompose; When satisfied screening stop condition, if n1=i, obtain n1 IMF component c
i(t) and 1 residual components r
nt (), u (t) then can be expressed as
extract c
in number of sample value c of (t)
i(k), k=1,2 ..., N;
(7-9) single-chip microcomputer utilizes formula
calculate each component energy of u (t), compare each component energy E of u (t)
max, choose E
1, E
2..., E
nmiddle maximal value E
max, work as E
maxduring > E, the judgement of level sensor fault made by single-chip microcomputer, the information of display display level sensor fault, and warning device sends warning message; Single-chip Controlling liquid level sensor and temperature sensor quit work;
Work as E
maxduring≤E, proceed to step (5-2);
Wherein, the screening stop condition of (7-6), (7-8) adopts imitative Cauchy's test for convergence,
work as S
dduring < ε, screening stops, and ε is usually between 0.2 and 0.3, and T is the constant of setting; Decomposing stop condition is residual signal r
it () becomes monotonic quantity.
8. the control method of liquid level detection device according to claim 5, is characterized in that, T1 and X is inversely proportional to, and T1 and T is inversely proportional to.
9. the control method of liquid level detection device according to claim 5, is characterized in that, the span of T2 is 0.9 second to 1.2 seconds.
10. the control method of the liquid level detection device according to claim 5 or 6 or 7 or 8 or 9, it is characterized in that, the span of Y1 is 3 milliamperes to 5 milliamperes, the span of Y2 is 19 milliamperes to 23 milliamperes.
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| CN105757847A (en) * | 2016-03-01 | 2016-07-13 | 浙江华通云数据科技有限公司 | Earth surface freshwater direct supply refrigerating system and control method |
| CN106370273A (en) * | 2016-11-22 | 2017-02-01 | 天津韶乐科技有限公司 | Automobile fuel tank fuel capacity calibration system and calibration method |
| CN108917876A (en) * | 2018-07-01 | 2018-11-30 | 张志栋 | Wisdom water channel reservoir level monitoring method and system |
| CN113029305A (en) * | 2021-03-25 | 2021-06-25 | 中国长江电力股份有限公司 | Self-adaptive fault diagnosis and correction system and method for hydropower station water level measurement |
| TWI781606B (en) * | 2021-05-03 | 2022-10-21 | 國立勤益科技大學 | Liquid level sensing device and method |
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| CN202204461U (en) * | 2011-07-21 | 2012-04-25 | 湘潭市华宇科技有限公司 | Device for measuring small displacement by utilizing single chip microcomputer |
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