Fault detection method for an engine exhaust valve control means, means

The present invention discloses a fault detection method for an engine exhaust valve control means, the control means includes a pressure regulator, the pressure tube or disconnected end communicating with the atmosphere through an electromagnetic valve, the other end of the exhaust control valve is driven to open the push rod by a spring degrees, the exhaust valve control amount of the engine exhaust gas pipe into the turbocharger, thereby controlling the intake pressure of the intake pipe; method to obtain the rate of change of the duty ratio of the solenoid valve, the intake pressure change rate; and then determining whether the intake pressure in line with the duty rate of change of change of the rate of change, if the exhaust valve control unit normally found; otherwise, if the exhaust valve control unit finds a failure. This method should be found with the intake pressure solenoid valve duty cycle changes correspondingly to the degree of change characteristic, and as a judgment condition to achieve a simple and accurate investigation whether the exhaust valve control unit failure. The present invention also discloses a failure detection device for an engine exhaust valve control unit.