Combined resistance type sensor

Abstract

The invention relates to a combined resistance type sensor which comprises a liquid level sensor, a signal conversion unit, a singlechip microcomputer unit, a combined resistance control unit and a power supply unit, wherein the output end of the liquid level sensor is connected with the input end of the signal conversion unit; the output end of the signal conversion unit is connected with the input end of the singlechip unit; the PWM (Pulse Width Modulation) signal output end of the singlechip unit is connected with the input end of the combined resistance control unit; the resistance signal output end of the combined resistance control unit is connected with a liquid level indicating instrument. The combined resistance type sensor is controlled by a singlechip microcomputer, a current value or voltage value output by the liquid level sensor is converted into a nonlinear combined resistance signal which is then output, so that when a voltage output type or current output type sensor is matched and connected with a moving coil type or moving-magnetic type cross coil fuel gauge, the fuel quantity value indicated by the fuel gauge can be still kept at high accuracy, the liquid level indication error is greatly reduced, and the application range of a capacitance, voltage or current type sensor is expanded.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to a synthetic resistance sensor. Background technique [0002] Traditional oil quantity sensors for automobiles and motorcycles use float-type liquid level sensors. This sensor is a sliding wire resistive sensor. Using the principle of leverage, the position of the float changes, driving the sliding wire resistive potentiometer to rotate, thereby changing the resistance value. Finally, it is displayed on the fuel gauge. When the height of the fuel tank is high, due to the large transmission force of the lever, it is easy to cause wear and damage to the slide wire resistive potentiometer. Current output type (the output current has a corresponding relationship with the liquid level) or voltage output type (the output voltage has a corresponding relationship with the liquid level). The oil gauge mostly uses the principle of moving coil or moving magnet cross coil. For the moving coil or mov...

AI Technical Summary

Problems solved by technology

[0003] The invention mainly solves the problem that the oil quantity value indicated by the oil gauge has a large error when the original current output type sensor and voltage output type sensor for measuring the liquid level are matched with the moving coil type and the moving magnet cross coil oil gauge. Technical problem: Provide a kind of synthetic resistive sensor, it can convert the electric current value that the electric current output type sensor outputs or the voltage value that the voltage output type sensor outputs into the non-linear synthetic resistance signal, promptly is equivalent to converting into resistive sensor, so When matched with the moving coil or moving magnet cross coil oil gauge, the accuracy of the oil quantity value indicated by the oil gauge can be improved and the error can be reduced

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