Fault detection method and device for engine waste gas valve control unit

Abstract

The invention discloses a fault detecting method for a control unit of an engine exhaust gas valve, and the control unit comprises a pressure regulator, one end of a pressure pipe is connected or disconnected with atmosphere through a solenoid valve while the other end thereof controls openness of the exhaust gas valve by driving a push rod via a spring, the exhaust gas valve controls exhaust air quantity from the exhaust gas pipe of the engine into a supercharger, and further controls inlet pressure of the air inlet pipe; the method comprises the following steps of: firstly acquiring change rates of the duty ratio and the inlet pressure of the solenoid valve; judging whether the change rate of the inlet pressure satisfies the variation tendency of the change rate of the duty ratio, if so, confirming the control unit of the exhaust gas valve in a normal status; if not, confirming it in trouble. Through the method, the inlet pressure shall be correspondingly changed along with the change of the duty ratio of the solenoid valve, in order to simply and precisely judge whether the control unit of the exhaust gas valve is in trouble. The invention further discloses a fault detecting device for the control unit of the engine exhaust gas valve.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a fault detection method and device for an engine waste gas valve control unit. Background technique [0002] On gasoline and gas engines, when the throttle control cannot increase the intake pressure under certain operating conditions, it is necessary to adjust the waste gas valve of the supercharger and related components to achieve the purpose of controlling the intake pressure. [0003] Please refer to figure 1 and figure 2 , figure 1 It is a structural schematic diagram of the exhaust valve control unit of the engine in the prior art, figure 2 for figure 1 Schematic diagram of the control of the medium pressure regulator. [0004] The waste gas valve control unit mainly includes a pressure regulator 1 , the control port 11 of the pressure regulator 1 communicates with two pressure pipes 12 , and the two pressure pipes 12 are connected or disconnected with the atmosphe...

AI Technical Summary

Problems solved by technology

[0008] However, in the long-term use process, the spring 13 of the pressure regulator 1, the waste gas valve 2 and the corresponding three-way solenoid valve 3 will have various failures, such as the three-way solenoid valve 3 cannot be opened and closed normally, and the waste gas valve 2 is under high temperature conditions for a long time. Adhesion occurs below and the spring 13 cannot be reset normally, etc., resulting in the failure of the exhaust valve 2 system to work normally, affecting the intake pressure, thereby affecting the output power and emission of the engine

[0009] In view of this, in view of the above technical problems, it is urgent to propose a fault detection method for the engine exhaust valve control unit to monitor the working state of the exhaust valve in real time and avoid the failure of the exhaust valve control unit to affect the output power and emission efficiency of the engine.

Images