Method and device for fault diagnosis of shutdown solenoid valve and shutdown control system

Abstract

The invention discloses a method and device for fault diagnosis of a shutdown solenoid valve and a shutdown control system. The method includes the steps that after a shutdown control signal is monitored and first time passes, whether the value of the rotating speed of an engine is larger than a preset rotating speed threshold value or not is detected, and when the value of the rotating speed is larger than the preset rotating speed threshold value, a fault of the shutdown solenoid valve is determined. The method and device can judge whether the engine stalls or not when the shutdown control signal is sent out, so that the opening and closing states of the shutdown solenoid valve are accurately judged, and then whether the shutdown solenoid valve itself breaks down or not is found. The method and device can judge the states of the shutdown solenoid valve for the control system and an aircraft pilot in time, so that the control system and the aircraft pilot timely adjust control law bases conveniently, and the safe shutdown of the engine is ensured.

Description

technical field [0001] The invention relates to the field of engine control, in particular to a fault diagnosis method and device for a parking solenoid valve and a parking control system. Background technique [0002] The parking solenoid valve is one of the important components in the engine control system, and the engine parking is first realized by controlling the parking solenoid valve. When the driver sends a parking signal to the engine control system, the engine control unit immediately sends a parking control signal to the parking solenoid valve, that is, the parking solenoid valve is energized, and the fuel supply to the engine combustion chamber is cut off when the parking solenoid valve is energized, and the engine loses fuel. Then it will turn off and stop. [0003] see figure 1 At present, the parking solenoid valve fault diagnosis device is generally a control loop judgment method (including control loop open circuit, short circuit, load impedance, etc.), an...

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Problems solved by technology

[0004] The object of the present invention is to provide a fault diagnosis method, device and parking control system of a parking solenoid valve, so as to solve the problem that the current parking solenoid valve fault diagnosis device cannot detect when the hardware circuit is intact, such as the parking solenoid valve does not operate or the action is not in place, etc. If the valve itself fails, it cannot truly reflect the technical problems of the opening and closing states of the parking solenoid valve

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