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Vehicle oil level sensing system

An oil level sensing and automotive technology, which is applied in the field of automotive oil level sensing systems, can solve the problems of small capacitance of capacitive sensors, difficulty in achieving high-precision measurement, and no temperature compensation circuit, so as to improve measurement accuracy and structure Simple, Inexpensive Effects

Inactive Publication Date: 2015-09-23
CHENGDU CONETON SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, since the capacitance of capacitive sensors is generally small, the conditioning circuit of the sensor is often affected by parasitic capacitance and environmental changes, making it difficult to achieve high-precision measurement
However, in the existing capacitive sensor oil level detection system, no temperature compensation circuit is set, and the gas oil level changes obviously when the gasoline is heated. Therefore, the present invention mainly overcomes the oil level error caused by heating.

Method used

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  • Vehicle oil level sensing system

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Embodiment 1

[0013] Such as figure 1 shown.

[0014] An automotive oil level sensing system, including a capacitor placed in the fuel tank, the two poles of the capacitor are connected to a demodulator, one signal of the demodulator is input to an oscillation control amplifier, and the other is input to a current control amplifier, and the oscillation control amplifier The output of the oscillator is connected to the oscillator, the output of the oscillator is connected to the current limiter, the output of the current limiter is connected to the current control circuit, the output of the current control amplifier is also connected to the current control circuit, and one output of the current control circuit is used as a signal source output, The other input is to the oscillation control amplifier and the voltage regulator, the output of the voltage regulator is to the current detector, and the output of the current detector is output as a signal source.

[0015] When the oil enters betwe...

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Abstract

The invention discloses a vehicle oil level sensing system, comprising a capacitor body placed in a fuel tank. Two electrodes of the capacitor body are connected with a demodulator. One path of signals of the demodulator is input to an oscillation control amplifier, and the other path is input to a current control amplifier. The output of the oscillation control amplifier is connected with an oscillator, and the output of the oscillator is connected with a current limiter. The output of the current limiter is connected with a current control circuit. The output of the current control amplifier is connected with the current control circuit. One path of the output of the current control circuit is used as signal source output, and the other path is input to the oscillation control amplifier and a voltage regulator. The voltage regulator outputs to a current detector. The output of the current detector is used as signal source output.

Description

technical field [0001] The invention relates to an automobile oil level measuring technology, in particular to an automobile oil level sensing system. Background technique [0002] In today's oil level detection field, capacitive sensors are widely used due to their simple structure, good dynamic response, high sensitivity, and ability to work in harsh environments. However, since the capacitance of a capacitive sensor is generally small, the conditioning circuit of the sensor is often affected by parasitic capacitance and environmental changes, making it difficult to achieve high-precision measurement. However, in the existing capacitive sensor oil level detection system, no temperature compensation circuit is provided, and the gas oil level changes obviously when gasoline is heated. Therefore, the present invention mainly overcomes the oil level error caused by heating. Contents of the invention [0003] The object of the present invention is to provide an automobile o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 陈晓琦
Owner CHENGDU CONETON SCI & TECH