CN105067079B - Liquid level detection device and its control method - Google Patents
Liquid level detection device and its control method Download PDFInfo
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- CN105067079B CN105067079B CN201510482588.3A CN201510482588A CN105067079B CN 105067079 B CN105067079 B CN 105067079B CN 201510482588 A CN201510482588 A CN 201510482588A CN 105067079 B CN105067079 B CN 105067079B
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Abstract
The invention discloses a kind of liquid level detection device and its control method, including housing, single-chip microcomputer and memory in housing, warning device and display on housing, temperature sensor and the liquid level sensor for measuring water level；The liquid level sensor includes inductance coil and can be located at relative to the silicon steel rod that inductance coil moves up and down, the temperature sensor on the copper cash winding of inductance coil in inductance coil.The present invention has high accuracy of detection, stability and good reliability；Wide adaptation range, the characteristics of limitation by the number of turns and line footpath of inductance coil.
Description
Technical field
The present invention relates to sensor technical field, and high more particularly, to a kind of accuracy of detection, cost is low, the good liquid of security
Level detecting apparatus and its control method.
Background technology
Existing Liquid level instrument inconvenient debugging be present, it is necessary to which the engineer of specialty, the signal drift of circuit are tighter
Weight, the collection of signal is unstable, and precision is low, and production cost is high, and the realization of function is complicated and unstable, to the number of turns and line of coil
There is the deficiency of strict requirements in footpath.
Chinese patent mandate publication number：CN102650538A, authorizes publication date August in 2012 29, discloses a kind of vapour
Car oil consumption combination metering system and oil tank liquid level transducer calibration method, mainly include：Fuel tank, fuel tank flowline, automobile fuel consumption
Gauge data wire, fuel consumption meter for automobile, fuel consumption meter for automobile flowline, oil return pipe, fuel pump, oil tank liquid level sensing
Device, oil tank liquid level sensor data cable, single-chip data processor, engine, single-chip data processor are simultaneously oily with automobile
Instrument data wire and the connection of oil tank liquid level sensor data cable are consumed, calculates oil consumption and the case liquid with vehicle oil wear indication gauge in real time
The oil mass of level sensor.The weak point of the invention is that accuracy of detection is low, can not discovery sensor failure.
The content of the invention
The goal of the invention of the present invention is that the accuracy of detection of Liquid level instrument of the prior art is low, Wu Fafa in order to overcome
The deficiency of existing sensor fault, there is provided a kind of accuracy of detection is high, and cost is low, the good liquid level detection device of security and its control
Method.
To achieve these goals, the present invention uses following technical scheme：
A kind of liquid level detection device, including housing, single-chip microcomputer and memory in housing, the alarm on housing
Device and display, temperature sensor and the liquid level sensor for measuring water level；The liquid level sensor include inductance coil,
In inductance coil can be relative to the silicon steel rod that inductance coil moves up and down, the float located at silicon steel rod lower end and for holding
Receive the guide cylinder of silicon steel rod bottom and float, guide cylinder lower end is provided with the opening that diameter is less than float diameter；The TEMP
Device is on the copper cash winding of inductance coil；Single-chip microcomputer respectively with warning device, inductance coil, memory, display and temperature
Sensor electrically connects.
The liquid level sensor of the present invention is used to detect the water level in boiler, and the temperature of boiler is generally in 20 DEG C -250 DEG C of model
In enclosing, and the change of temperature can cause the drift for detecting current value, and therefore, invention increases for detecting inductance coil temperature
Temperature sensor, and by 200 to 1000 times experiment, obtain temperature drift calibration coefficient table, be provided with temperature drift calibration coefficient table
The related temperature drift calibration coefficient T1 of the current value of temperature T, detection signal to inductance coil；
With the fluctuation of water level, silicon steel rod moves up and down in inductance coil, and inductance coil produces electric signal u (t)；Setting
Initial time is a0；
Temperature sensor detects the temperature T of inductance coil, single-chip microcomputer collection a0Moment u (t) value X, single-chip microcomputer profit
Temperature drift calibration coefficient table is retrieved with X, T, obtains the temperature drift calibration coefficient T1 corresponding with X；Single-chip microcomputer is calculated comprising a0When
U (t) maximum X2 and minimum value X1 in unit interval T2 in being engraved in；
Single-chip microcomputer utilizes formulaCalculate and obtain by correction of temperature drift
Current detection value Z；
As Z >=W2, single-chip microcomputer control warning device alarm, display shows the too high information of water level；
As Z≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level.
So that the detection of water level is more accurate, effectively prevent temperature, detection current value, transducer range lower limit Y1,
The maximum X2 and minimum value X1 of transducer range upper limit Y2, u (t) to detecting the influence of electric current, accuracy of detection is high, stability and
Good reliability；To the size wide adaptation range of inductance coil, do not limited by the number of turns and line footpath.
Therefore, the present invention has high accuracy of detection, stability and good reliability；Wide adaptation range, not by inductance coil
The characteristics of limitation of the number of turns and line footpath.
Preferably, also including wireless transceiver and booster circuit, wireless transceiver is electromechanical by booster circuit and monolithic
Connection, wireless transceiver are connected with mobile phone or computer wireless.
When water level is too high or water level is too low, in the same of warning device alert and display display alarm information
When, wireless transceiver can send wireless alarm signal to mobile phone or computer, so that long-range staff obtains water level in time
Abnormal message.
Preferably, also include status indicator lamp, status indicator lamp and monolithic mechatronics.During normal work, state refers to
Show lamp display green or blueness；Water level is too high or when water level is too low, the red flicker of status indicator lamp.
Preferably, the alert process device includes loudspeaker and buzzer, loudspeaker and buzzer are electrically connected with single-chip microcomputer
Connect.
A kind of control method of liquid level detection device, comprises the following steps：
Be provided with transducer range lower limit Y1 in (5-1) memory, transducer range upper limit Y2, temperature drift calibration coefficient table, with
Water level lower limit corresponding current threshold W1 and the current threshold W2 corresponding with water level higher limit；In temperature drift calibration coefficient table
Provided with the related temperature drift calibration coefficient T1 of temperature T, the current value of detection signal to inductance coil；Initial time is set as a0；
(5-1-1) moves up and down with the fluctuation of water level, silicon steel rod in inductance coil, and inductance coil produces electric signal u
(t)；
(5-2) temperature sensor detects the temperature T of inductance coil, single-chip microcomputer collection a0Moment u (t) value X, monolithic
Machine obtains the temperature drift calibration coefficient T1 corresponding with X using X, T retrieval temperature drift calibration coefficient table；Single-chip microcomputer, which is calculated, to be included
a0U (t) maximum X2 and minimum value X1 in unit interval T2 including moment；
(5-3) single-chip microcomputer utilizes formulaCalculate and obtain through excess temperature
Float the current detection value Z of amendment；Single-chip microcomputer stores Z and current time in memory；
(5-4) shows the too high information of water level when Z >=W2, single-chip microcomputer control warning device alarm, display；
As Z≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ＜ W2, interval time T2, make a0Value increase T2, return to step (5-2).
Preferably, after the working time of inductance coil was more than 1 minute, the step (5-4) is replaced by following step：
Single-chip microcomputer reads the Z before the time at current time T2 stored in memory, calculates and obtains current time
Z the and T2 times before Z average value Z ',
As Z ' >=W2, single-chip microcomputer control warning device alarm, display shows the too high information of water level；
As Z '≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ' ＜ W2, interval time T2, make a0Value increase T2, return to step (5-2).
Because the water level of boiler is fluctuating in real time, the water level of actual measurement is probably crest or wave base, and the present invention adopts at interval of T2
Collect u (t) value X, the average value Z ' of the Z before Z the and T2 times for calculating and obtaining current time, make the defeated of water level signal
Go out it is smoother, and with Z ' come the height of multilevel iudge water level, so as to improve the stability of water level detecting, reliability.
Preferably, also comprise the following steps between step (5-1-1) and (5-2)：
The initial value that the initial value provided with j is 1, i in (7-1) memory is 1, provided with fault threshold E；
(7-2) single-chip microcomputer calculates u (t) local maximum and obtains coenvelope line u by cubic spline interpolationup(t)；
(7-3) calculates signal u (t) local minimum and obtains lower envelope line u by cubic spline interpolationlow(t)；
(7-4) defines average envelope m1(t)=[uup(t)+ulow(t)]/2；
(7-5) utilizes formula hj(t)=u (t)-mj(t) calculating difference hj(t)；
(7-6) is if hj(t) IMF screening stop conditions are unsatisfactory for, make u (t)=hj(t), j values increase by 1, return to step (7-2)
To hj(t) continue to decompose；Work as hj(t) meet that IMF sieves stop condition, then obtain the 1st IMF components C of u (t) signals1
(t)=hj(t)；
(7-7) utilizes formula ri(t)=u (t)-ci(t) residual components r is calculatedi(t)；
(7-8) works as ri(t) when being unsatisfactory for decomposing stop condition, u (t)=r is madei(t) i values, are made to increase by 1, return to step (7-
2) to ri(t) continue to decompose；When meeting to sieve stop condition, if n1=i, n1 IMF components c is obtainedi(t) divide with 1 residue
Measure rn(t), u (t) can be then expressed asExtract ci(t) N number of sample value ci(k), k=1,2 ...,
N；
(7-9) single-chip microcomputer utilizes formulaU (t) each component energy is calculated, compares u (t) each component
ENERGY Emax, choose E1, E2..., EnMiddle maximum Emax, work as EmaxDuring ＞ E, single-chip microcomputer makes the judgement of level sensor fault,
Display shows the information of level sensor fault, warning device alert；Single-chip microcomputer controls liquid level sensor and temperature
Degree sensor is stopped；
Work as EmaxDuring≤E, step (5-2) is transferred to；
Wherein, (7-6), the screening stop condition of (7-8) use imitative Cauchy's test for convergence,Work as SDSieve and stop during ＜ ε, for ε generally between 0.2 and 0.3, T is to set
Fixed constant；Decomposition stop condition is residual signal ri(t) it is changed into monotonic function.
Preferably, T1 is inversely proportional with X, T1 is inversely proportional with T.
Preferably, T2 span is 0.9 second to 1.2 seconds
Preferably, Y1 span is 3 milliamperes to 5 milliamperes, Y2 span is 19 milliamperes to 23 milliamperes.
Therefore, the present invention has the advantages that：Accuracy of detection height, stability and good reliability；Wide adaptation range, no
Limited by the number of turns and line footpath of inductance coil.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the present invention；
Fig. 2 is a kind of flow chart of embodiments of the invention 1.
In figure：Single-chip microcomputer 1, memory 2, warning device 3, display 4, temperature sensor 5, liquid level sensor 6, inductor wire
Circle 7, silicon steel rod 8, wireless transceiver 9, booster circuit 10, status indicator lamp 11, loudspeaker 12, buzzer 13, mobile phone 14.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment 1
Embodiment as shown in Figure 1 is a kind of liquid level detection device, including housing, single-chip microcomputer 1 in housing and is deposited
Reservoir 2, warning device 3 and display 4 on housing, temperature sensor 5 and the liquid level sensor 6 for measuring water level；
Liquid level sensor include inductance coil 7, in inductance coil can relative to the silicon steel rod 8 that inductance coil moves up and down, set
In the float of silicon steel rod lower end and guide cylinder for accommodating silicon steel rod bottom and float, guide cylinder lower end be provided with diameter be less than it is floating
The opening of sub- diameter；The temperature sensor is on the copper cash winding of inductance coil；Single-chip microcomputer respectively with warning device, inductance
Coil, memory, display and temperature sensor electrical connection.
Also include wireless transceiver 9 and booster circuit 10, wireless transceiver passes through booster circuit and monolithic mechatronics, nothing
Line transceiver and the wireless connection of mobile phone 14.Also include status indicator lamp 11, status indicator lamp and monolithic mechatronics.
Alert process device includes loudspeaker 12 and buzzer 13, loudspeaker and buzzer with monolithic mechatronics.
As shown in Fig. 2 a kind of control method of liquid level detection device, comprises the following steps：
Step 100, inductance coil produces electric signal
Be provided with transducer range lower limit Y1 in memory, transducer range upper limit Y2, temperature drift calibration coefficient table, with water level
Limit value corresponding current threshold W1 and the current threshold W2 corresponding with water level higher limit；In temperature drift calibration coefficient table be provided with
The related temperature drift calibration coefficient T1 of the temperature T of inductance coil, the current value of detection signal；Initial time is set as a0；
| 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 T unit for DEG C, X unit is mA；
Step 110, as the fluctuation of water level, silicon steel rod move up and down in inductance coil, inductance coil produces electric signal u
(t)；
Step 200, temperature drift calibration coefficient T1, u (t) maximum X2 and minimum value X1 in second unit interval T2=1 are obtained
Temperature sensor detects the temperature T of inductance coil, single-chip microcomputer collection a0Moment u (t) value X, single-chip microcomputer profit
Temperature drift calibration coefficient table is retrieved with X, T, obtains the temperature drift calibration coefficient T1 corresponding with X；Single-chip microcomputer is calculated comprising a0When
U (t) maximum X2 and minimum value X1 in unit interval T2 in being engraved in；
Step 300, calculate and obtain the current detection value Z by correction of temperature drift
Single-chip microcomputer utilizes formulaCalculate and obtain by correction of temperature drift
Current detection value Z；Single-chip microcomputer stores Z and current time in memory；
Step 400, the judgement and control of water level height
As Z >=W2, single-chip microcomputer control warning device alarm, display shows the too high information of water level；
As Z≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ＜ W2, interval time T2, make a0Value increase T2, return to step 200.
In the present embodiment, Y1 4mA, Y2 20mA.
Embodiment 2
Embodiment 2 includes all structure and step parts in embodiment 1, when the working time of inductance coil is more than 1 point
Zhong Hou, the step 400 of embodiment 1 are replaced by following step：
Single-chip microcomputer reads the Z before the time at current time T2 stored in memory, calculates and obtains current time
Z the and T2 times before Z average value Z ',
As Z ' >=W2, single-chip microcomputer control warning device alarm, display shows the too high information of water level；
As Z '≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ' ＜ W2, interval time T2, make a0Value increase T2, return to step 200.
Embodiment 3
Embodiment 3 includes all structure and step parts in embodiment 1, between the step 110 of embodiment 1 and 200 also
Comprise the following steps：
The initial value that the initial value provided with j is 1, i in (7-1) memory is 1, provided with fault threshold E；
(7-2) single-chip microcomputer calculates u (t) local maximum and obtains coenvelope line u by cubic spline interpolationup(t)；
(7-3) calculates signal u (t) local minimum and obtains lower envelope line u by cubic spline interpolationlow(t)；
(7-4) defines average envelope m1(t)=[uup(t)+ulow(t)]/2；
(7-5) utilizes formula hj(t)=u (t)-mj(t) calculating difference hj(t)；
(7-6) is if hj(t) IMF screening stop conditions are unsatisfactory for, make u (t)=hj(t), j values increase by 1, return to step (7-2)
To hj(t) continue to decompose；Work as hj(t) meet that IMF sieves stop condition, then obtain the 1st IMF components c of u (t) signals1
(t)=hj(t)；
(7-7) utilizes formula ri(t)=u (t)-ci(t) residual components r is calculatedi(t)；
(7-8) works as ri(t) when being unsatisfactory for decomposing stop condition, u (t)=r is madei(t) i values, are made to increase by 1, return to step (7-
2) to ri(t) continue to decompose；When meeting to sieve stop condition, if n1=i, n1 IMF components c is obtainedi(t) divide with 1 residue
Measure rn(t), u (t) can be then expressed asExtract ci(t) N number of sample value ci(k), k=1,2 ...,
N；
(7-9) single-chip microcomputer utilizes formulaU (t) each component energy is calculated, compares u (t) each component
ENERGY Emax, choose E1, E2..., EnMiddle maximum Emax, work as EmaxDuring ＞ E, single-chip microcomputer makes the judgement of level sensor fault,
Display shows the information of level sensor fault, warning device alert；Single-chip microcomputer controls liquid level sensor and temperature
Degree sensor is stopped；
Work as EmaxDuring≤E, step 200 is transferred to；
Wherein, (7-6), the screening stop condition of (7-8) use imitative Cauchy's test for convergence,Work as SDSieve and stop during ＜ ε, for ε generally between 0.2 and 0.3, T is to set
Fixed constant；Decomposition stop condition is residual signal ri(t) it is changed into monotonic function.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
After having read the content of the invention lectured, those skilled in the art can make various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (9)
1. a kind of control method of liquid level detection device, liquid level detection device includes housing, single-chip microcomputer (1) in housing and
Memory (2), warning device (3) and display (4) on housing, temperature sensor (5) and the liquid for measuring water level
Level sensor (6)；The liquid level sensor include inductance coil (7), in inductance coil can be relative on inductance coil
Silicon steel rod (8), the float located at silicon steel rod lower end and the guide cylinder for accommodating silicon steel rod bottom and float of lower movement, it is oriented to
Cylinder lower end is provided with the opening that diameter is less than float diameter；The temperature sensor is on the copper cash winding of inductance coil；Monolithic
Machine electrically connects with warning device, inductance coil, memory, display and temperature sensor respectively；It is characterized in that including following step
Suddenly：
Transducer range lower limit Y1, transducer range upper limit Y2, temperature drift calibration coefficient table and water level are provided with (1-1) memory
Lower limit corresponding current threshold W1 and the current threshold W2 corresponding with water level higher limit；It is provided with temperature drift calibration coefficient table
The related temperature drift calibration coefficient T1 of the current value of temperature T, detection signal to inductance coil；Initial time is set as a0；
(1-1-1) moves up and down with the fluctuation of water level, silicon steel rod in inductance coil, and inductance coil produces electric signal u (t)；
(1-2) temperature sensor detects the temperature T of inductance coil, single-chip microcomputer collection a0Moment u (t) value X, single-chip microcomputer profit
Temperature drift calibration coefficient table is retrieved with X, T, obtains the temperature drift calibration coefficient T1 corresponding with X；Single-chip microcomputer is calculated comprising a0When
U (t) maximum X2 and minimum value X1 in unit interval T2 in being engraved in；
(1-3) single-chip microcomputer utilizes formulaCalculate and obtain repairing by temperature drift
Positive current detection value Z；Single-chip microcomputer stores Z and current time in memory；
(1-4) shows the too high information of water level when Z >=W2, single-chip microcomputer control warning device alarm, display；
As Z≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ＜ W2, interval time T2, make a0Value increase T2, return to step (1-2).
2. the control method of liquid level detection device according to claim 1, it is characterized in that, in addition to wireless transceiver (9)
With booster circuit (10), wireless transceiver is by booster circuit and monolithic mechatronics, wireless transceiver and mobile phone (14) or electricity
Brain wireless connection.
3. the control method of liquid level detection device according to claim 1, it is characterized in that, in addition to status indicator lamp
(11), status indicator lamp and monolithic mechatronics.
4. the control method of liquid level detection device according to claim 1, it is characterized in that, the alert process device includes
Loudspeaker (12) and buzzer (13), loudspeaker and buzzer with monolithic mechatronics.
5. the control method of liquid level detection device according to claim 1, it is characterized in that, when the working time of inductance coil
After 1 minute, the step (1-4) is replaced by following step：
Single-chip microcomputer reads the Z before the time at current time T2 that stores in memory, calculate and obtain current time Z and
The average value Z ' of Z before the T2 times,
As Z ' >=W2, single-chip microcomputer control warning device alarm, display shows the too high information of water level；
As Z '≤W1, single-chip microcomputer control warning device alarm, display shows the too low information of water level；
After W1 ＜ Z ' ＜ W2, interval time T2, make a0Value increase T2, return to step (1-2).
6. the control method of liquid level detection device according to claim 1, it is characterized in that, step (1-1-1) and (1-2) it
Between also comprise the following steps：
The initial value that the initial value provided with j is 1, i in (6-1) memory is 1, provided with fault threshold E；
(6-2) single-chip microcomputer calculates u (t) local maximum and obtains coenvelope line u by cubic spline interpolationup(t)；
(6-3) calculates signal u (t) local minimum and obtains lower envelope line u by cubic spline interpolationlow(t)；
(6-4) defines average envelope m1(t)=[uup(t)+ulow(t)]/2；
(6-5) utilizes formula hj(t)=u (t)-mj(t) calculating difference hj(t)；
(6-6) is if hj(t) IMF screening stop conditions are unsatisfactory for, make u (t)=hj(t), j values increase by 1, return to step (6-2) is to hj
(t) continue to decompose；Work as hj(t) meet that IMF sieves stop condition, then obtain the 1st IMF components c of u (t) signals1(t)=
hj(t)；
(6-7) utilizes formula ri(t)=u (t)-cj(t) residual components r is calculatedi(t)；
(6-8) works as ri(t) when being unsatisfactory for decomposing stop condition, u (t)=r is madei(t) i values, are made to increase by 1, return to step (6-2) is right
ri(t) continue to decompose；When meeting to sieve stop condition, if n1=i, n1 IMF components c is obtainediAnd 1 residual components r (t)n
(t), u (t) can be then expressed asExtract ci(t) N number of sample value ci(k), k=1,2 ..., N；
(6-9) single-chip microcomputer utilizes formulaU (t) each component energy is calculated, compares u (t) each component energy
Emax, choose E1, E2..., EnMiddle maximum Emax, work as EmaxDuring ＞ E, single-chip microcomputer makes the judgement of level sensor fault, display
Device shows the information of level sensor fault, warning device alert；Single-chip microcomputer controls liquid level sensor and temperature to pass
Sensor is stopped；
Work as EmaxDuring≤E, step (1-2) is transferred to；
Wherein, (6-6), the screening stop condition of (6-8) use imitative Cauchy's test for convergence,Work as SDSieve and stop during ＜ ε, for ε generally between 0.2 and 0.3, T is to set
Fixed constant；Decomposition stop condition is residual signal ri(t) it is changed into monotonic function.
7. the control method of liquid level detection device according to claim 1, it is characterized in that, T1 is inversely proportional with X, T1 and T into
Inverse ratio.
8. the control method of liquid level detection device according to claim 1, it is characterized in that, T2 span is 0.9 second
To 1.2 seconds.
9. the control method of the liquid level detection device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, its feature
It is that Y1 span is 3 milliamperes to 5 milliamperes, Y2 span is 19 milliamperes to 23 milliamperes.
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| CN105757847B (en) * | 2016-03-01 | 2018-09-07 | 淳安华通云数据科技有限公司 | Surface fresh water direct-furnish refrigeration 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 |
| CN113029305B (en) * | 2021-03-25 | 2023-09-19 | 中国长江电力股份有限公司 | Hydropower station water level measurement self-adaptive fault diagnosis and correction system and method |
| 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 micro displacement by utilizing single chip microcomputer |
| CN102650538A (en) * | 2012-05-24 | 2012-08-29 | 上海神舟汽车节能环保有限公司 | Combined measurement system for automobile fuel consumption and calibration method for oil tank liquid level sensor of |
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