基于案例推理的故障诊断系统广泛应用于机械、电气、电子及电热等领域。叙述了一种可直接处理连续参量的改进案例模型,阐述了该模型相对于普通案例模型具有抗噪声能力强的优点,给出了改进案例模型的构造方法及案例检索和索引编排算法。给出对某典型案例的故障诊断结果,验证该模型的优点。 Fault diagnosis system based on case-based reasoning is widely used in mechanical, electrical, electronic and electric fields. An improved case model which can deal with continuous parameters directly is described. The advantages of the model in comparison with the common case model with strong anti-noise ability are described. The construction method of the improved case model and case-based indexing and indexing algorithm are given. The fault diagnosis results of a typical case are given and the advantages of the model are verified.