CN101713684A - Method for sensing sectional capacitance digital vehicle oil level and sensor - Google Patents
Method for sensing sectional capacitance digital vehicle oil level and sensor Download PDFInfo
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- CN101713684A CN101713684A CN200910190981A CN200910190981A CN101713684A CN 101713684 A CN101713684 A CN 101713684A CN 200910190981 A CN200910190981 A CN 200910190981A CN 200910190981 A CN200910190981 A CN 200910190981A CN 101713684 A CN101713684 A CN 101713684A
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Abstract
The invention relates to a method for sensing a sectional capacitance digital vehicle oil level and a sensor. A plurality of groups of parallel plate capacitors which are arranged at equal intervals on a measuring height and have equal or approximate initial capacitance value are taken as measuring elements, wherein the height of the whole measuring elements is approximate or equal to that of an oil tank, the whole measuring elements are arranged in the oil tank, and the group number of the parallel plate capacitors soaked in an oil is also correspondingly changed when the oil level is changed; after a group of parallel plate capacitors is soaked in the oil, the capacitance value of the parallel plate capacitors becomes higher than the initial capacitance value; and a processing circuit compares the capacitance value of each group of parallel plate capacitors with the initial capacitance value to know the group number of the soaked capacitors in the measuring elements and an oil height value is obtained by multiplying the group number by a layout interval between the parallel plate capacitors so as to measure the vehicle oil level. The method has no mechanical moving component, is suitable for different oil media, solves the problem of oil level demixing, is also in favour of prolonging the service life of the sensor, and has the advantages of simple structure, low technological requirements and low price.
Description
Technical field
The invention belongs to the liquid level field of sensing technologies, be specifically related to sensing technology automotive oil tank fluid height.
Background technology
Automobile oil level sensor can be used for detecting oil mass, engine motor oil oil mass and the brake fuel tank fuel quantity in the fuel oil fuel tank.When engine motor oil is not enough, this situation of the timely sensing of this sensor also sends electric signal immediately to ECU, and ECU then starts warning system, lights emergency warning lamp or the sound that gives a warning, avoid engine under the situation of insufficient lubrication, to work on, thereby prevent that effectively engine from damaging; When fuel quantity is not enough, remind human pilot to refuel, avoid because Low oil Fuel causes the automobile halfway to cast anchor; When the brake fluid quantity not sufficient, ECU starts warning system, lights emergency warning lamp or the sound that gives a warning, and avoids emergency episodes such as automobile generation brake failure.
Oil level position transducer commonly used at present can be divided into types such as condenser type fuel level sensor, ultrasound wave fuel level sensor, resistance-type fuel level sensor, optics fuel level sensor and magnetostriction type fuel level sensor according to principle.The sensor of these types relative merits separately are as follows:
The condenser type fuel level sensor
This liquid level sensor is simple in structure, and reliability is very high; High temperature resistant and the high pressure of popping one's head in, the on-the-spot face width that adapts to; Power consumption is extremely low, is suitable for the measurement of inflammable and explosive danger medium.With regard to present capacitance level transducer, when carrying out level gauging, must know the relative dielectric constant of measured liquid.In addition, when measuring that liquid is inhomogeneous, relative dielectric constant changes or fluid to be measured when changing, just must demarcate again, thereby limit its usable range greatly.
The ultrasound wave fuel level sensor
According to the ultrasonic pulsative signal that ultrasonic probe sends, in liquid, propagate, be reflected after running into the interface of air and liquid, can obtain ultrasonic propagation time after receiving echoed signal.Utilize its velocity of propagation and travel-time to calculate its propagation distance, obtain liquid level.The easy temperature influence of this sensor, and price is more expensive.
The resistance-type fuel level sensor
The resistance that this method utilizes resistivity height, material that temperature coefficient is big to make applies the variation that voltage detects oil level in conjunction with the fuel level sensor float with at the resistance two ends.Temperature is high more, and resistance is high more.When resistance is immersed in the fluid, temperature descends, and resistance detects changes in resistance also along with decline, can obtain the variation of fuel oil.This sensor is to adhere to the Fe-Ni sheet resistance on metal forming, thereby makes the electrothermal fuel level sensor.
The influence of measuring accuracy liquid body pollution condition is very big, easily produce mistake, and response speed is slow.Corrosion takes place and causes inefficacy in addition, at present used carbon resister easily in gasoline.
The optics fuel level sensor
This method is utilized reflection of light or transmission principle, carries out oil-level measurement according to the difference of reflection or transmitted light intensity or luminous flux.Owing to cost an arm and a leg, be not extensive use of as yet at present.
The magnetostriction type fuel level sensor
Magnetostrictive liquid level sensor is to utilize the magnetostrictive effect of material to experience the variation of liquid surface float, thereby reaches the purpose of non-cpntact measurement oil level.This fuel level sensor measuring accuracy height, environmental suitability is strong, security good, easy for installation, also can be applicable to level gauging fields such as oil, chemical industry, because of costing an arm and a leg, in the aircraft oil-level measurement, use mostly at present.
Summary of the invention
The present invention is directed to the fuel tank fluid height sensor relative merits separately of different principle in the present prior art, propose a kind of method for sensing sectional capacitance digital vehicle oil level and sensor of inner no mechanical moving component, realize measurement level height based on the parallel flat capacitance principle.
Technical scheme of the present invention is as follows:
A kind of method for sensing sectional capacitance digital vehicle oil level, its adopt many groups initial capacitance value of arranging to equate in the measuring height equal intervals or close parallel flat electric capacity as measuring assembly, the height of whole measurement assembly near or equal the fuel tank height, described measurement assembly is the non-tight formula, be installed in the fuel tank, oil level changes, and the fluid height of measuring in the assembly changes simultaneously, is immersed in also corresponding the changing of parallel flat capacitance group number in the fluid; After fluid immersed parallel flat electric capacity, the capacitance of parallel flat electric capacity its initial value relatively can become big; Described measurement assembly is by output line connection processing circuit, the capacitance and the initial capacitance value that compare parallel flat electric capacity by treatment circuit, in case capacitance is greater than the initial capacitance value, treatment circuit just has voltage output, just represents that fluid has immersed this group electric capacity; When oil level in the fuel tank changes, the capacitance group number that is immersed in the fluid also can change, thereby there is the treatment circuit way of voltage output to know the capacitance group number of measuring submergence in the assembly by judgement, multiply by and measure that the arrangement pitch between the parallel flat electric capacity can obtain the fluid height value in the assembly, realize that automobile oil level measures.
According to above-mentioned automotive oil tank oil level method for sensing, the invention also discloses a kind of sensing sectional capacitance digital vehicle oil level device, described fuel level in tank sensor comprises that one is measured assembly and treatment circuit.
Described measurement assembly is equated by many groups initial capacitance value of arranging in the measuring height equal intervals or close parallel flat electric capacity constitutes, the height of whole measurement assembly near or equal the fuel tank height, described measurement assembly is the non-tight formula, and be installed in the fuel tank, measure assembly by output line connection processing circuit.
Described treatment circuit adopts multi-disc capacity measurement chip CAV424 to carry out the test of capacitance; The initial capacitance value of each group parallel flat electric capacity is replaced with a close fixed condenser of appearance value, as the fixed capacity C of CAV424
X1, the C of CAV424
X2Connect one group of parallel flat electric capacity measuring in the assembly; In case appearance value that voltage output promptly represents parallel flat electric capacity is arranged greater than the initial capacitance value, promptly has fluid to enter this group parallel flat electric capacity.
Perhaps, described treatment circuit is made up of many groups capacitance test circuit and comparator circuit, and parallel flat electric capacity is connected to the input end of capacitance test circuit, capacitance is converted to the electric signal of being convenient to comparison; The anode of comparator circuit is received in the output of capacitance test circuit, compare with initial capacitance value institute electrical signal converted from negative terminal, in case comparator circuit has signal output, the capacitance of then representing parallel flat is greater than initial value, and promptly fluid has entered into this group parallel flat electric capacity.
When oil level changes, the fluid height of measuring in the assembly changes simultaneously, be immersed in also corresponding the changing of capacitance group number in the fluid, the group number that treatment circuit is output as high level can change, the treatment circuit group number that is output as high level by judgement obtains the capacitance group number of fluid submergence, multiplying each other with arrangement pitch to obtain the fluid height value, realizes that automobile oil level measures.
Respectively organize parallel flat electric capacity in the described measurement assembly and vertically arrange successively from bottom to top, integral installation is in fuel tank; Or respectively organize parallel flat electric capacity and liquid level by same angle and be in tilted layout successively in fuel tank from bottom to top; Or respectively organize parallel flat electric capacity and be parallel to liquid level respectively and be arranged in the fuel tank successively from bottom to top.
As seen, advantage of the present invention is fairly obvious:
At first, it adopts sectional type parallel flat capacitance principle to realize the sensing of oil level, has realized large-range measuring;
The second, it is a kind of oil-level measurement of inner non mechanical movable, has realized the characteristics of survey sensor sensing unit on-mechanical contact, helps prolonging the serviceable life of sensor;
The 3rd, it adopts equally spaced areal survey mode to measure, and has eliminated the influence of factors such as environment, realized the oil-level measurement with media independent, and measurement result is not subjected to the influence of fluid layering;
The 4th, can increase the group number of electric capacity in the unit height, thereby realize more high-precision measurement according to the actual requirements;
The 5th, it is simple in structure, and technological requirement is not high, low price.
Description of drawings
Fig. 1 is a parallel flat capacitance principle synoptic diagram;
Fig. 2 is the implementation that a kind of parallel flat capacitive transducer is measured oil level;
Fig. 3 is the linear relationship chart that the parallel flat capacitive transducer is measured oil level;
Fig. 4 is the mounting structure synoptic diagram of this sensor;
Fig. 5 is the circuit diagram of CAV424 as a kind of treatment circuit.
Fig. 6 is the realization block diagram of another kind of treatment circuit.
Fig. 7 is the circuit diagram of Fig. 6 specific implementation.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is carried out further detailed presentations by preferred embodiment.
The inventive method has adopted parallel flat electric capacity, and referring to Fig. 1, its principle is as follows:
Two is that its appearance value of two parallel plates electric capacity C of S is at a distance of D, useful area:
Wherein: ε-specific inductive capacity
The k-dielectric constant
From formula (1) as can be seen, if the distance D of two-plate is a constant, useful area S is fixedly the time, and capacitance is directly proportional with dielectric constant ε between pole plate.
Thereby when the medium between parallel flat electric capacity changed, DIELECTRIC CONSTANT changed, and the capacitance of electric capacity can corresponding changing.Thereby, can know at an easy rate by the change of measuring this capacitor's capacity whether medium change has taken place between parallel flat electric capacity.
Based on this, the oil level position sensing method that the present invention proposes is as follows:
Employing is arranged in fluid height equal intervals, initial capacitance equates or close many groups parallel flat electric capacity constitutes the measurement assembly, and the height of this measurement assembly is approaching or equal the fuel tank height, and vertically is installed on the fuel tank medial surface.This electric capacity is the non-tight formula, and when oil level changed, the fluid height of measuring in the assembly changed simultaneously, corresponding the changing of capacitance group number of being flooded by fluid.
Respectively organize the capacitance that electric capacity records in the assembly and handle measuring, compare, obtain the capacitance group number that flooded by fluid, multiply by arrangement pitch and can obtain the fluid height value, realize that automobile oil level measures with the initial capacitance value through back-end circuit.
From the method for foregoing description of the present invention as can be known, it has adopted the fixing parallel flat electric capacity of open structure, when oil level changes, measure also corresponding the changing of level height in the assembly, when fluid is in a certain parallel flat electric capacity, as shown in Figure 2, the D apart of two-plate, plate width W, pole plate height L, fluid height L
1, the fluid DIELECTRIC CONSTANT
2, dielectric constant of air ε
1, then this parallel flat electric capacity can be regarded the parallel connection of two parallel flat electric capacity as, and one is formed by fluid, and another is formed by air, and then total capacitance is:
According to formula (2) as can be seen, the appearance value C of electric capacity:
C＝A[B+(ε
2-ε
1)L
1] (3)
Wherein,
B＝ε
1L (5)
DIELECTRIC CONSTANT when structure certain (being that polar plate spacing D, width W, height L are constant), air
1DIELECTRIC CONSTANT for constant, fluid
2During for constant, A, B are constant in the formula 4,5, i.e. the height L of capacitance and fluid
1Linear.Shown in the solid line among Fig. 3.Also be, adopt the capacity plate antenna of the fixed sturcture of the capacitance structure preparation shown in Fig. 2, its appearance value and fluid height are linear, see Fig. 3, in case there is fluid to enter between two-plate, capacitance is just big than initial capacitance value, thereby just can judge whether there has been the fluid medium in the parallel flat electric capacity by the appearance value of measuring electric capacity.
Referring to Fig. 4, based on the above method, the invention allows for a kind of specific implementation structure of sensor on sensing automotive oil level that this method forms, it measures assembly 1 by one and corresponding treatment circuit is formed.Measuring assembly 1 is many groups parallel flat electric capacity of equidistantly arranging along the measuring height direction, the initial capacitance value of every group of parallel flat electric capacity equates, the length of measuring assembly 1 near or equal the height of fuel tank 2, be installed in fuel tank 2 medial surfaces, fluid can enter between the two-plate of respectively organizing electric capacity.Measure assembly by output line connection processing circuit, measuring-signal is handled.Among this figure, parallel flat electric capacity adopts vertically parallel, and the form of equidistantly arranging successively from bottom to top.For easy to make, one of them flat board of all parallel flat electric capacity all is arranged on the same pole plate, and the height of each parallel flat electric capacity is h1, and adjacent two parallel flat electric capacity spacings are h-h1; Another flat board of parallel flat electric capacity is shared, referring to Fig. 4.
Measuring-signal is handled and can be adopted following technology to realize, as shown in Figure 5.CAV424 among Fig. 5 is a chip of measuring electric capacity, C
X1Be fixed capacity, C
X2Be measured capacitance.CAV424 is such as principle, and one by capacitor C
OSCThe reference oscillator of determining frequency is being controlled the integrator of the constant symmetric construction identical with the cycle of two phase places.The amplitude of these two integrators passes through capacitor C
X1And C
X2Determine.Relatively the voltage amplitude difference of two integrators just can draw capacitor C
X1And C
X2Relative capacitance variations difference, this differential signal converts d. c. voltage signal and through the output of the adjustable differential signal output stage of output promptly 5. and the V 6. to by a secondary low-pass filter
DIFF, promptly obtain accurate capacitance.
Because electric capacity involved in the present invention has two classes, a class is the many groups electric capacity that participates in measurement; Another kind of for these initial values that participates in the electric capacity of measurement, here can replace with a fixed capacity.Thereby can utilize multi-disc CAV424 to carry out the measurement of this two classes electric capacity, with the initial capacitance value as fixed capacity C
X1In case, have voltage output to represent that promptly this electric capacity has fluid to enter.
The processing of measuring-signal also can realize by other mode, referring to Fig. 6 and Fig. 7.Described treatment circuit is made up of many groups capacitance test circuit and comparator circuit.Parallel flat electric capacity is connected to the input end of capacitance test circuit, capacitance is converted to the electric signal of being convenient to comparison; The anode of comparator circuit is received in the output of capacitance test circuit, compare with initial capacitance value institute electrical signal converted from negative terminal, in case comparer has signal output, then represent the capacitance of parallel flat and greater than initial value, fluid has been immersed between this group parallel flat electric capacity.Every group of capacitance test circuit is divided into the test circuit and the electric capacity initial value test circuit of parallel flat electric capacity.
The specific implementation method can be carried out according to scheme shown in Figure 7.Parallel flat electric capacity is connected to the Cx1 place shown in Fig. 7, and the fixed capacity of utilizing an appearance value to be a bit larger tham parallel flat electric capacity initial value is connected to the Cx2 place; LM555 and peripheral circuit constitute an oscillatory circuit, and its 3 pin output signal frequency is directly proportional with 2 capacitor's capacities that pin connects.The frequency signal of oscillatory circuit output is received f respectively
In1And f
In2The place, the frequency-voltage conversion circuit of being made up of LM2907 and peripheral circuit converts the frequency signal of importing to be directly proportional with it voltage signal.The output of frequency-voltage conversion circuit is received respectively in the comparer of being made up of LM239 and peripheral circuit the rear end and is compared; Wherein, the Vout1 that is directly proportional with the parallel flat capacitance receives the comparer anode, and the Vout2 that is directly proportional with parallel flat electric capacity initial capacitance value receives the comparer negative terminal; For guaranteeing comparability, the front end electric parameter of the two is in full accord.When parallel flat capacitance during greater than its initial capacitance value, comparer is output as high level, represents this group parallel flat capacitance greater than its initial value, and fluid has immersed reorganization electric capacity.Otherwise be low level.Figure 7 shows that the treatment circuit unit of one group of parallel flat electric capacity, actual circuit should increase processing unit according to the constitute capacitance group number of measuring assembly.
Claims (8)
1. method for sensing sectional capacitance digital vehicle oil level is characterized in that:
Many groups initial capacitance value that employing is arranged in the measuring height equal intervals equate or close parallel flat electric capacity as measuring assembly, the height of whole measurement assembly near or equal the fuel tank height, described measurement assembly is the non-tight formula, is installed in the automotive oil tank; Oil level changes, and the fluid height of measuring in the assembly changes simultaneously, is immersed in also corresponding the changing of parallel flat capacitance group number in the fluid, and after fluid immersed parallel flat electric capacity, the capacitance of parallel flat electric capacity its initial capacitance value relatively can become big; Described measurement assembly is by output line connection processing circuit, the capacitance and the initial capacitance value that compare parallel flat electric capacity by treatment circuit, in case capacitance is greater than the initial capacitance value, treatment circuit just has voltage output, and expression fluid has immersed this group electric capacity; When oil level in the fuel tank changes, the capacitance group number that is immersed in the fluid also can change, the treatment circuit way that voltage output is arranged by judgement, thereby know the capacitance group number of measuring submergence in the assembly, multiply by and measure the arrangement pitch between the parallel flat electric capacity in the assembly, can obtain the fluid height value, realize the automobile oil level measurement.
2. sectional capacitance digital vehicle fuel level in tank sensor of realizing the described method of claim 1 is characterized in that: described sensor comprises that one is measured assembly and treatment circuit;
Described measurement assembly is equated by many groups initial capacitance value of arranging in the measuring height equal intervals or close parallel flat electric capacity constitutes, the height of whole measurement assembly near or equal the fuel tank height, described measurement assembly is the non-tight formula, and be installed in the fuel tank, measure assembly by output line connection processing circuit.
Described treatment circuit adopts multi-disc capacity measurement chip CAV424 to carry out the test of capacitance; The initial capacitance value of each group parallel flat electric capacity is replaced with a close fixed condenser of appearance value, as the fixed capacity C of CAV424
X1, the C of CAV424
X2Connect one group of parallel flat electric capacity measuring in the assembly; In case capacitance that voltage output promptly represents parallel flat electric capacity is arranged greater than the initial capacitance value, promptly has fluid to enter this group parallel flat electric capacity;
Perhaps, described treatment circuit is made up of many groups capacitance test circuit and comparator circuit, and parallel flat electric capacity is connected to the input end of capacitance test circuit, capacitance is converted to the electric signal of being convenient to comparison; The anode of comparator circuit is received in the output of capacitance test circuit, compare with initial capacitance value institute electrical signal converted from negative terminal, in case comparator circuit has signal output, the capacitance of then representing parallel flat is greater than initial value, and promptly fluid has entered into this group parallel flat electric capacity;
When oil level changes, the fluid height of measuring in the assembly changes simultaneously, be immersed in also corresponding the changing of capacitance group number in the fluid, the group number that treatment circuit is output as high level can change, the treatment circuit group number that is output as high level by judgement obtains the capacitance group number of fluid submergence, thereby knows the fluid height.
3. sensing sectional capacitance digital vehicle oil level device according to claim 2 is characterized in that:
Described every group of capacitance test circuit comprises parallel flat capacitance test circuit and electric capacity initial value test circuit, parallel flat capacitance test circuit succusion principle, one group of parallel flat electric capacity measuring in the assembly is connected in the oscillatory circuit of LM555 formation, capacitance is converted to the frequency values that is directly proportional with capacitance; Initial capacitance value test circuit is consistent with parallel flat capacitance test circuit principle, just is a bit larger tham the fixed capacity replacement of parallel flat initial capacitance value with an appearance value, and through behind the capacitance test circuit, capacitance has been converted to the frequency values that is directly proportional with it.
4. sensing sectional capacitance digital vehicle oil level device according to claim 3 is characterized in that:
Described parallel flat capacitance test circuit and electric capacity initial value test circuit frequency values directly compare, perhaps connect FV convertor more respectively, be converted into the magnitude of voltage that is directly proportional with it, be input to the input end of comparator circuit respectively through the magnitude of voltage after the conversion, the comparator circuit anode is received in the output of parallel flat capacitance test circuit, the comparator circuit negative terminal is received in the output of electric capacity initial value test circuit, when in case comparator circuit is output as high level, represent this group parallel flat capacitance greater than its initial capacitance value, promptly fluid has immersed reorganization electric capacity.
5. according to claim 2,3 or 4 described sensing sectional capacitance digital vehicle oil level devices, it is characterized in that:
Respectively organize parallel flat electric capacity in the described measurement assembly and vertically arrange successively from bottom to top, integral installation is in fuel tank; Or respectively organize parallel flat electric capacity and liquid level by same angle and be in tilted layout successively in fuel tank from bottom to top; Or respectively organize parallel flat electric capacity and be parallel to liquid level respectively and be arranged in the fuel tank successively from bottom to top.
6. sensing sectional capacitance digital vehicle oil level device according to claim 5 is characterized in that:
The spacing of respectively organizing parallel flat electric capacity in the described measurement assembly is adjusted according to measurement requirement, increase electric capacity in the unit length the group number, reduce arrangement pitch and can increase measuring accuracy, otherwise then reduce measuring accuracy.
7. sensing sectional capacitance digital vehicle oil level device according to claim 2 is characterized in that:
The employed back-end processing circuit of described measurement assembly is as logic determines, not as the measurement of actual capacitance value.
8. sensing sectional capacitance digital vehicle oil level device according to claim 2 is characterized in that:
Employed fixed capacity in the employed treatment circuit of described measurement assembly, its capacitance should be a bit larger tham the initial capacitance value of parallel flat electric capacity.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922958A (en) * | 2010-09-21 | 2010-12-22 | 重庆德格科技发展有限公司 | Combed capacitance type oil-level sensor box capable of blocking oil level fluctuation |
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN103017863A (en) * | 2012-12-12 | 2013-04-03 | 重庆德格科技发展有限公司 | Parallel-plate multi-electrode capacitance type oil level sensor |
| CN103575360A (en) * | 2012-07-19 | 2014-02-12 | 北京航天试验技术研究所 | Circuit measuring achieving method for segmentation capacitor liquid level sensor |
| CN104296830A (en) * | 2014-10-24 | 2015-01-21 | 杰克缝纫机股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN105222855A (en) * | 2015-09-15 | 2016-01-06 | 苏州塔夫电子科技有限公司 | A kind of fuel tank Height of oil measurement mechanism |
| CN106894404A (en) * | 2017-03-22 | 2017-06-27 | 中交武汉港湾工程设计研究院有限公司 | A kind of rubble bedding slip casting full weight detection sensor and detecting system |
| CN107003171A (en) * | 2014-10-08 | 2017-08-01 | 半导体元件工业有限责任公司 | Horizon sensor and method |
| CN111397701A (en) * | 2020-03-20 | 2020-07-10 | 西安交通大学 | Capacitive liquid level sensor and calibration method and measurement method thereof |
| CN111947027A (en) * | 2020-07-31 | 2020-11-17 | 广东省特种设备检测研究院东莞检测院 | Low-temperature liquefied gas level measuring method |
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2009
- 2009-09-25 CN CN200910190981A patent/CN101713684A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN101922958A (en) * | 2010-09-21 | 2010-12-22 | 重庆德格科技发展有限公司 | Combed capacitance type oil-level sensor box capable of blocking oil level fluctuation |
| CN103575360A (en) * | 2012-07-19 | 2014-02-12 | 北京航天试验技术研究所 | Circuit measuring achieving method for segmentation capacitor liquid level sensor |
| CN103575360B (en) * | 2012-07-19 | 2016-05-11 | 北京航天试验技术研究所 | Merogenesis capacitive liquid level sensor measuring circuit implementation method |
| CN103017863A (en) * | 2012-12-12 | 2013-04-03 | 重庆德格科技发展有限公司 | Parallel-plate multi-electrode capacitance type oil level sensor |
| CN107003171A (en) * | 2014-10-08 | 2017-08-01 | 半导体元件工业有限责任公司 | Horizon sensor and method |
| CN104296830A (en) * | 2014-10-24 | 2015-01-21 | 杰克缝纫机股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN105222855A (en) * | 2015-09-15 | 2016-01-06 | 苏州塔夫电子科技有限公司 | A kind of fuel tank Height of oil measurement mechanism |
| CN106894404A (en) * | 2017-03-22 | 2017-06-27 | 中交武汉港湾工程设计研究院有限公司 | A kind of rubble bedding slip casting full weight detection sensor and detecting system |
| CN111397701A (en) * | 2020-03-20 | 2020-07-10 | 西安交通大学 | Capacitive liquid level sensor and calibration method and measurement method thereof |
| CN111947027A (en) * | 2020-07-31 | 2020-11-17 | 广东省特种设备检测研究院东莞检测院 | Low-temperature liquefied gas level measuring method |
| CN111947027B (en) * | 2020-07-31 | 2022-03-18 | 广东省特种设备检测研究院东莞检测院 | Low-temperature liquefied gas level measuring method |
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Open date: 20100526 |