本文首先提出了故障状态系数的概念,在大量的实验基础上总结出“故障特征—故障特征量—故障状态系数”的机械故障珍断研究方法。文中以内燃机连杆钢套磨损为例,介绍了其在内燃机维修状态预测和故障珍断上的应用。 In this paper, the concept of fault state coefficient is first proposed. Based on a large number of experiments, the research method of mechanical fault diagnosis based on “fault feature - fault feature quantity - fault state factor” is summarized. In this paper, the wear of the connecting rod steel sleeve of an internal combustion engine is taken as an example, and its application in the prediction of the maintenance status of the internal combustion engine and the fault diagnosis are introduced.