Oil tank oil level sensing mechanism and sensor using oil tank oil level sensing mechanism

Abstract

The invention discloses an oil tank oil level sensing mechanism and a sensor using the oil tank oil level sensing mechanism. The oil tank oil level sensing mechanism comprises a signal circuit moduleand a moving module which perform mutual induction. The signal circuit module comprises a circuit board assembly; a processing circuit assembly which is arranged on the circuit board assembly; an induction assembly which is arranged on the circuit board assembly, wherein the induction assembly is connected with the processing circuit assembly and the induction assembly and the moving module are inmutual induction; and an induction film which is arranged on the circuit board assembly and covers the induction assembly. The position signal precision is high and the resolution ratio is high; thecost is low and the structure is simple; the stability of the position signal of the sensor in a severe working environment is ensured; the induction film made of the soft magnetic material has the characteristics of low coercive force, low magnetic saturation density and high magnetic conductivity, the material can realize the maximum magnetization intensity or magnetic saturation by using the minimum external magnetic field and the fastest speed, and when the external magnetic field disappears, the material can be demagnetized at the fastest speed.

Description

technical field [0001] The invention relates to a fuel tank oil level sensing mechanism and a sensor using the fuel tank oil level sensing mechanism. Background technique [0002] Automobile fuel tank oil level sensor is a measuring instrument tailored for the precise measurement of automobile fuel tank oil level. [0003] In the current existing technology, the oil (liquid) level sensor is divided into two types: contact induction and non-contact induction. The contact oil level sensor uses a sliding potentiometer as the basic detection element, which is driven by a float. Use an ohmmeter to detect its resistance value, so as to achieve the purpose of displaying the oil level. This type of contact oil level sensor is low in cost, but when the oil dirt covers the potentiometer, its resistance value will change, causing great errors, and even failure of function. Make this type of oil level sensor a very short-lived wearing part. [0004] Another type of non-contact oil lev...

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Problems solved by technology

[0006] 1) The technical principle of the reed switch determines the characteristics of its single-point position detection. As the float (magnet) moves up and down, a reed switch can only detect one position of the float (magnet) at a time and output the switch signal. If If long-distance detection is required, multiple reed switches are required, which makes the resolution of the position signal very low and the accuracy is extremely poor;

[0007] 2) With the extension of the detection distance of the application end, the manufacturing cost of the oil level sensor is increasing continuously, and the current requirements for energy saving and emission reduction of automobiles are continuously increasing, and the detection of automobile oil level is particularly important. Accurate oil level measurement can reduce energy consumption. Therefore, in order to increase the accuracy of the sensor, the back-end single-chip microcomputer is required to perform linear correction processing, which also increases the difficulty of oil level detection;

[0008] 3) The demagnetization of the float (magnet) at high temperature and the detection distance from the reed switch will affect the switch point of the reed switch, resulting in a decrease in the accuracy of the position signal

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