关键词: 因果网络, 故障诊断, 关联模式

Abstract: In the procedure of fault diagnosis by probabilistic causal network model，the solution of the diagnostic problem can not be directly gotten by the traditional reasoning algorithm，furthermore，multi-level，multi-node complicated causal network may lead to the problem of “combinatorial explosion” and the exponential increase in computational cost etc.The competition-based connectionist model reasoning algorithm based on probabilistic causal network is put forward and the algorithm is modified.The problem of multi-level，multi-node complicated causal network reasoning is solved by the algorithm presented，and the complexity of the diagnosis is reduced.Finally，the advantages and the engineering practicability are demonstrated by a practical example.

Key words: causal network, fault diagnosis, connectionist model