针对工程机械电气控制系统故障特点,以挖掘机起动回路的故障为例,借助故障树分析方法,分析了顶事件故障概率和各底事件的重要度,优化了工程机械电气控制系统故障的诊断及预防,验证了故障树分析法在工程机械电气控制系统故障诊断及预防中应用的可行性和有效性。 Aiming at the fault characteristics of electrical control system of construction machinery, taking the fault of excavator starting circuit as an example, the failure probability of top event and the importance of each event are analyzed with the help of fault tree analysis method, and the fault diagnosis of construction machinery electrical control system is optimized. Prevent and verify the feasibility and effectiveness of fault tree analysis in the fault diagnosis and prevention of electrical machinery control system.