Capacitance electronic type fuel sensor

Abstract

The invention discloses a capacitance electronic type fuel sensor, comprising a capacitance sensing unit, a capacitance measurement unit and a capacitance / liquid level conversion unit, wherein the capacitance sensing unit is a composite tubing capacitance element, comprising a metal external tube and a metal internal tube, and the metal external tube and the metal internal tube compose the a fuel liquid level sensor capacitor; the capacitance sensing unit is used for conversing fuel liquid level into a relevant capacitance value; the metal external tube and the metal internal tube of the capacitance sensing unit are respectively connected to an input terminal of the capacitance measurement unit by lead; the capacitance measurement unit is used for measuring a capacitance value of the capacitive sensor unit; and the capacitance / liquid level conversion unit is electrically connected to the capacitance measurement unit, for conversing the capacitance value form the capacitance measurement unit into liquid level. The sensor of the invention is simple and easy to manufacture, resolves common oversized distribution parameter in the capacitance fuel sensor and not-easy accurate measurement of the capacitance parameter.

Description

technical field [0001] The invention relates to a fuel sensor, in particular to a capacitive electronic fuel sensor. Background technique [0002] In the automotive fuel sensor market, fuel sensors mainly include reed rheostat fuel sensor, sliding rheostat fuel sensor, capacitive fuel sensor and pressure fuel sensor. The swing arm type and dry spring have the highest domestic market share. Tube fuel sensor. The capacitive fuel sensor has attracted widespread attention due to its advantages of high precision, good temperature characteristics, and ease of manufacture. Among the capacitive fuel sensors, variable medium capacitive sensors are the most widely used. At present, the main difficulties in the realization of its products are as follows: [0003] 1. It is easily affected by distribution parameters. Capacitive sensors are measured as capacitance values, so the product is easily affected by distribution parameters, resulting in measurement errors; [0004] 2. Capacitan...

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Problems solved by technology

[0005] The object of the present invention is to provide a simple and easy-to-manufacture capacitive electronic fuel sensor, which solves the problems that the common distribution parameters in capacitive fuel sensors are too large and the capacitance parameters are difficult to measure accurately, and the capacitive electronic fuel sensor described in the present invention The capacitance measurement circuit and algorithm adopted by the sensor can effectively reduce the error of capacitance value measurement

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