模糊逻辑诊断技术在一定程度上模拟了人处理模糊信息的思维方法，为机器故障诊断的研究和发展注入了新的活力．本文提出了一种新的模糊逻辑诊断算法，并给出了模糊逻辑诊断算法整体性能的综合评判指标．该算法继承了常用算法中的取小（“∧”）运算，而将常用算法中的取大（“∨”）及累加（“Σ”）运算发展为连乘（“Π”）运算，以求得故障存在的可能度．将其用于某工程机械液压系统的故障诊断，效果良好 Fuzzy logic diagnosis technology to a certain extent, simulates the human way of thinking fuzzy information processing, fault diagnosis for the study and development has injected new vitality. In this paper, a new fuzzy logic diagnosis algorithm is proposed, and the comprehensive evaluation index of the overall performance of the fuzzy logic diagnosis algorithm is given. The algorithm inherits the small (“∧”) operation of the commonly used algorithms and develops the “∨” and “Σ” Find out the possibility of failure. It is used to diagnose the fault of a hydraulic system of a construction machinery, and the effect is good