High-accuracy non-contact waste gas recirculation valve position sensor

Abstract

The invention discloses a high-accuracy non-contact waste gas recirculation valve position sensor, which comprises a cylindrical shell, a circuit board, a magnet, a sliding handle, a magnetic shielding cover, metal terminal pins and a hall chip, wherein the circuit board and the metal terminal pins are installed in clamping grooves on the internal side wall of the shell, the hall chip is installed on the circuit board, the rear end of the sliding handle is slideably installed in the shell, the magnet is installed on one side of the sliding handle, the magnetic shielding cover is installed in the side wall of the shell, the front end of the sliding handle penetrates through an opening at the bottom of the magnetic shielding cover and stretches out of the shell, the hall chip can cut the magnetic induction lines of the magnet when the magnet moves along with the sliding handle, and the hall chip and the magnet are always in a non-contact state. By adopting a non-contact method, the problem of contact wear is solved, the service life of the sensor is greatly prolonged, the special structure can effectively prevent dust and vapor and the high-accuracy linear output characteristic is obtained.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system of an automobile engine, in particular to a high-precision non-contact exhaust gas recirculation valve position sensor. Background technique [0002] Exhaust gas recirculation (EGR) systems are used to reduce the emission of nitrogen oxides (NOX) in the exhaust gas. Nitrogen and oxygen can only react chemically under the conditions of high temperature and high pressure. The temperature and pressure in the combustion chamber of the engine meet the above conditions, especially during forced acceleration. [0003] The exhaust gas recirculation valve position sensor, also referred to as the EGR valve position sensor, is a key component in the recirculation system. Its main function is to accurately measure the position of the EGR valve so that the ECU can implement control to achieve the best engine EGR rate. When the engine is running under load, the EGR valve opens, allowing a smal...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-precision non-contact exhaust gas recirculation valve position sensor to solve the problem that the prior art exhaust gas recirculation valve position sensor is easy to wear due to the frequent sliding of the metal shrapnel contact relative to the ceramic resistance sheet during the working process. In turn, the exhaust gas recirculation valve position sensor is invalid and damaged, the output linearity is difficult to control, and it is more sensitive to dust and water vapor.

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