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Method for sensing sectional capacitance digital vehicle oil level and sensor

A technology of oil level sensor and segmental capacitance, which is applied in the field of sensing the oil level of the automobile fuel tank, can solve the problems of high price and not yet widely used, and achieve the effect of cheap price, simple structure and high precision measurement

Inactive Publication Date: 2010-05-26
昝昕武
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Problems solved by technology

Not widely used yet due to high cost

Method used

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  • Method for sensing sectional capacitance digital vehicle oil level and sensor
  • Method for sensing sectional capacitance digital vehicle oil level and sensor
  • Method for sensing sectional capacitance digital vehicle oil level and sensor

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Embodiment Construction

[0037] The technical scheme of the present invention will be described in further detail below through preferred examples in conjunction with the accompanying drawings.

[0038] The inventive method has adopted parallel plate electric capacity, see figure 1 , the principle is as follows:

[0039] The capacitance C of two parallel plate capacitors with a distance of D and an effective area of ​​S is:

[0040] C = ϵS 4 πkD - - - ( 1 )

[0041] Where: ε-dielectric constant

[0042] k-dielectric constant

[0043] It can be seen from formula (1) that if the distance D between the two plates is constant and the effective area S is fixed, the capacitance value is proportional to the dielectric constant ε between the plates.

[0044] Therefore, when the medium between the parallel plate capacitors changes, the dielectric cons...

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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 [0001] The invention belongs to the technical field of liquid level height sensing, and in particular relates to the sensing technology of the oil liquid height of an automobile fuel tank. Background technique [0002] Automotive oil level sensors can be used to detect the amount of oil in the fuel tank, engine oil, and brake tank. When the engine oil is insufficient, the sensor senses the situation in time and immediately sends an electric signal to the ECU, and the ECU starts the warning system, lights up the warning light or makes a warning sound, so as to prevent the engine from continuing to work under poor lubrication conditions, thus effectively Prevent engine damage; when the fuel oil is insufficient, remind the driver to refuel to avoid the car breaking down due to insufficient fuel; when the brake oil is insufficient, the ECU activates the warning system, lights up the warning light or makes a warning sound to avoid the car from braking Failure and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 昝昕武
Owner 昝昕武
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