Digital capacitance type liquid level measuring sensor

A liquid level measurement and capacitive technology, which is applied in the field of digital capacitive liquid level measurement sensors, can solve the problems of short service life, inaccurate readings, large reading errors, etc., and achieve the effect of long service life and accurate readings

Inactive Publication Date: 2010-04-07
HEFEI UNIV OF TECH
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  • Abstract
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Problems solved by technology

Because the core component of the float type liquid level sensor is a variable resistor, it performs mechanical movement with the change of the liquid level and is directly exposed to the fuel. Long-term use leads to a large reading error. The disadvantage of this type of sensor is that the reading is not accurate and the service life Short, the driver cannot accurately grasp the current accurate fuel volume
[0003] Now the car's oil quantity

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  • Digital capacitance type liquid level measuring sensor
  • Digital capacitance type liquid level measuring sensor
  • Digital capacitance type liquid level measuring sensor

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Capacitive liquid level sensor is the application of the capacitance value and the electrode's facing area, spacing and the dielectric constant of the medium between the electrodes. When two of the quantities are kept unchanged and the third quantity is changed, the capacitance value changes accordingly. This principle is realized. With the maturity of microelectromechanical system (MEMS) processing technology, we can make capacitive electrodes on silicon substrates, which can form large-scale arrays, obtain high-precision, low-energy sensors, and reduce costs. , more suitable for mass production.

[0023] The invention provides a novel digital capacitive liquid level measurement sensor based on MEMS technology, which can be used for the liquid level measurement of automobile fuel tanks, and can also be used in the fields of chemical industry, petroleum, water l...

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Abstract

The invention relates to the liquid level measuring field, in particular to a digital capacitance type liquid level measuring sensor comprising a capacitance probe, a data acquisition circuit, a data receiving circuit and a display, wherein the output of the capacitance probe is connected with the data acquisition circuit, the output of the data receiving circuit is connected with the display, and the data acquisition circuit is connected with the data receiving circuit via CAN and LIN network. The invention overcomes the shortages of incorrect reading and limited service life of the prior art and has the advantages of accurate reading and long service life, oil mass display can be integrated with other parameters, such as speed per hour and temperature display.

Description

technical field [0001] The invention relates to a digital capacitive liquid level measurement sensor used in chemical industry, petroleum, water level and other relevant liquid level measurement fields. Background technique [0002] Liquid level sensors include input liquid level sensors (rod type, cable type), flange type liquid level sensors (single flange, double flange), magnetic flap liquid level sensors and float liquid level sensors, etc. According to different environmental requirements, corresponding sensors can be selected. At present, most of the sensors used to measure the fuel volume of automobile fuel tanks are float type liquid level sensors. The measurement principle is to put a float into the liquid, the float will drive the resistance of the variable resistor to change according to the change of the liquid level, and then control the display according to the change of the current in the circuit to obtain the real-time liquid level value. Because the core c...

Claims

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Application Information

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IPC IPC(8): G01F23/26
Inventor 许高斌张肖康陈兴周革李一方
Owner HEFEI UNIV OF TECH
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