1. The principle of the oil level sensor is to use the capacitance formed by filling the liquid medium between the positive and negative detectors to change linearly with the liquid level, and convert the change of the capacitance (that is, the change of the liquid level) into a standard electrical signal output;
2, the core components of the product use highly integrated special capacitance measurement chip;
3. After accurate temperature compensation and linear correction, it has the advantages of high precision, high stability and continuous measurement, and has strong independence.
Under normal circumstances is a sliding rheostat, the resistance value is controlled by a float, with the amount of oil, the resistance value will change, under the condition that the loading voltage is fixed, the output current changes. The current value is reflected in the automobile instrument and converted into the amount of gasoline in a certain proportion.
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Generally, due to the irregularity of the fuel tank, the resistance change of the rheostat is not regular