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采用框架式专家系统知识表达方式（外壳）与双向模糊推理机相结合的方法，实现对内燃机车柴油发动机磨损状态的自动和智能推理诊断。介绍了利用针对具体诊断对象的可装卸的知识库结构，使本文方法构造的专家系统外壳具备了较好的通用性。
The automatic and intelligent inferential diagnosis of diesel engine wear state of diesel locomotive is realized by combining the method of frame expert system knowledge expression (shell) and bidirectional fuzzy inference engine. The disassembly and reorganization of the knowledge base structure for the specific diagnosis object is introduced, which makes the expert system housing constructed by this method possesses good versatility.