本文从发动机的动力特性出发,对气缸工作过程故障机理进行了分析。在缸压频率中提取了缸压特征量,用试验方法论证,用同样的方法从气缸盖上缸压振动响应信号中提取的缸压特征量也能够表征气缸压力。利用气缸压力对气门间隙和点火提前角的工作状态进行识别,从而达到对发动机的动力性能进行监测的目的。 Based on the dynamic characteristics of the engine, this paper analyzes the failure mechanism of the cylinder working process. The cylinder pressure characteristic is extracted from the cylinder pressure frequency. With the test method, the cylinder pressure can be characterized by the same method to extract the cylinder pressure characteristic signal from the cylinder pressure vibration response signal. The use of cylinder pressure on the valve clearance and ignition timing of the working state to identify, so as to achieve the engine’s dynamic performance monitoring purposes.