Electromagnetic valve fault diagnosis method and device and gas engine

The invention relates to an electromagnetic valve fault diagnosis method and device and a gas engine. An electromagnetic valve is of a parallel structure, a driving pin of the electromagnetic valve is connected with an electromagnetic valve control module, and the electromagnetic valve fault diagnosis method comprises the following steps: in the opening process of the electromagnetic valve, monitoring the current slope of the electromagnetic valve and the voltage on the driving pin of the electromagnetic valve; and based on the current slope of the electromagnetic valve and/or the voltage on the driving pin, determining the fault of the electromagnetic valve. According to the electromagnetic valve fault diagnosis method, the single-branch open-circuit fault of the electromagnetic valve of the parallel structure is accurately recognized through abnormal detection of the load current change slope of the electromagnetic valve, and the defect that a driving chip cannot detect the fault is overcome. 本发明涉及一种电磁阀故障诊断