Engine safety shutdown system and oil injection turn-off method and device of engine

The invention provides an engine safety shutdown system and an oil injection turn-off method and device of an engine. The oil injection turn-off method of the engine comprises the steps that the state of a key switch T15 is monitored; when the T15 is located at the falling edge, a timer is triggered to start timing; and when the timing indication of the timer reaches the delay of the preset time, an oil injection turn-off path is activated. In the oil injection turn-off method of the engine, the trigger condition of oil injection turn-off only uses the state of T15 instead of any condition related to the original logic, so that the situation that flameout cannot be performed due to common cause failure or cascade failure between conditions with logic relationship caused by the same condition is avoided, and therefore the engine can be safely stopped. 本申请提供了一种发动机安全停车系统及其喷油关断方法、装置，该发动机喷油关断方法包括：监测钥匙开关T15的状态；当所述T15处于下降沿时，触发定时器开始计时；当所述定时器的计时指示达到预定时间的延时时，激活喷油关断路径。本申请提供的该发动机喷油关断方法中，喷油关断的触发条件只使用T15的状态，而不采用任何与原有逻辑相关的条