介绍了某低温系统在线故障诊断专家系统,叙述了诊断系统的基本结构及故障监测、预测和故障处理。系统使用delphi开发工具,利用各运行参数之间的逻辑关系作为推理依据,运用经验知识和理论知识相结合作为故障诊断的理论依据,对整个低温系统进行状态监测和故障诊断,指导操作人员排除故障。 This paper introduces an online fault diagnosis expert system of a low temperature system, describes the basic structure of the diagnosis system, fault monitoring, prediction and fault handling. The system uses delphi development tools, the use of the logical relationship between the operating parameters as a basis for reasoning, the use of empirical knowledge and theoretical knowledge as a theoretical basis for fault diagnosis, the entire low-temperature systems for condition monitoring and fault diagnosis, guide operators to troubleshoot .