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Model-based diagnosis is a new type of intelligent reasoning technology that is developed to overcome the serious defects of traditional expert system diagnosis method,which is a popular method in the 1970s.The basic point of view of model-based reasoning is that the knowledge of the internal structure and behavior of a device can be used to diagnose the device.On one hand.the actual system behavior is monitored.On the other hand,the internal model will predict system behavior.When there are non-negligible differences between the two results,a potential fault is detected by the diagnosis process [l].