Electronic throttle valve body of diesel engine

Abstract

The invention discloses an electronic throttle valve body of a diesel engine. The electronic throttle valve body comprises a main body, a printed circuit board of a control circuit, a throttle valve sheet, a limiting block, a bearing, a throttle valve shaft assembly, a magnet assembly, a socket assembly, a resetting gear assembly, a direct-current motor, a resetting spring and a dustproof cover. The printed circuit board of the control circuit is welded on the socket assembly; a limiting board is formed on a throttle valve shaft through injection molding so as to form the throttle valve shaft assembly; a resetting gear is welded on the throttle valve shaft assembly; the throttle valve shaft assembly is assembled on the throttle valve body through the bearing; and the throttle valve sheet is inserted into the throttle valve shaft and is linked through a screw. The direct-current motor is mounted in the main body through the socket assembly in a pressing manner. The resetting spring is located below the resetting gear assembly. One stand bar of the resetting spring is hung on the main body, and the other stand bar is hung on the resetting gear assembly. The electronic throttle valve body disclosed by the invention is not influenced by a magnetic field. Furthermore, an entire control system is sealed in a cavity. Compared with the prior art, a protection cover is manufactured by a metal board with higher magnetic conductivity, so that the electronic throttle valve body can be used for shielding external electromagnetic interferences.

Description

technical field [0001] The invention relates to a diesel engine, in particular to an electronic throttle body of the diesel engine. Background technique [0002] Diesel engine EFI system adopts throttle body assembly, its function is to give the engine continuously variable air flow, and avoid vibration when the engine is shut down by reducing the air flow. In order to adapt to various working conditions or cooperate with exhaust gas recirculation (EGR, Exhaust Gas Recirculation), different air flows are provided to achieve a reasonable air-fuel ratio, make it fully combustible, reduce emissions, and improve engine power and economy , comfort. [0003] At present, most of the throttle bodies used in diesel engines are contact angle position sensors. The disadvantage is that the sensor accuracy is reduced due to the easy wear of the resistive film, which affects the control accuracy of the throttle body. Most of the existing throttle body axial limit adopts metal limit plat...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the throttle bodies used in diesel engines are contact angle position sensors. The disadvantage is that the sensor accuracy is reduced due to the easy wear of the resistive film, which affects the control accuracy of the throttle body.

Most of the existing throttle body axial limit adopts metal limit plate, etc., and it is a one-way limit. The disadvantage is that it is easy to wear, and the one-way limit moves greatly, which reduces the life of the throttle body.

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