A measuring circuit of a resistive liquid level sensor and an adaptive measuring method for the measuring circuit

Abstract

The invention relates to a resistance-type liquid level sensor measuring circuit. The resistance-type liquid level sensor measuring circuit comprises an adaptive divider resistance circuit, a liquid level sensor circuit, a VCC power end, a single chip microcomputer analog-digital conversion channel circuit and a single chip microcomputer, an adaptive measuring circuit is formed, and a liquid level is sought through the liquid level sensor circuit. In the measurement process, by means of the method of changing values of resistors connected with an adjustable resistor Rs in series by selecting divider resistors, voltages of the liquid level sensor circuit are input into the single chip microcomputer analog-digital conversion channel circuit through RC filtering separately, by comparing trust values, the liquid level sensor resistance is calculated, the liquid level is sought through the adjustable resistor Rs, in the measurement process, by means of the resistance value size change of the adjustable resistor Rs, resistance-type liquid level sensors within different resistance ranges are adapted, and then the effect of achieving compatibility of the resistance-type liquid level sensors within different resistance ranges in the measurement process is achieved. An adaptive measurement method has the advantages of being easy to operate and convenient to use.

Description

【Technical field】 [0001] The invention relates to the technical field of electronic control of automobile engines, in particular to a resistance type liquid level sensor measurement circuit and an adaptive measurement method for the measurement circuit in terms of the combination of various types of resistances on the engine. 【Background technique】 [0002] In the prior art field of automobile engine electronic control systems, the liquid level sensor has been widely used in the industry. Most of the liquid level sensors in the prior art adopt a liquid level sensor that realizes accurate collection within a specified resistance range. The liquid level sensor matching circuits are all fixed, and because the resistive liquid level sensors produced by different manufacturers have different characteristic resistance ranges, the results of the calibration data collected by the liquid level sensor are inconsistent or the collected data is inaccurate. If the liquid level sensor wi...

AI Technical Summary

Problems solved by technology

The liquid level sensor matching circuits are all fixed, and because the resistive liquid level sensors produced by different manufacturers have different characteristic resistance ranges, the results of the calibration data collected by the liquid level sensor are inconsistent or the collected data is inaccurate.

If you change the liquid level sensor with another characteristic before use, you need to re-select the matching circuit and re-calibrate the data, which will cause extreme inconvenience to the user.

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