当输入一个E - ICAS指示的故障症状，该专家系统即能够通过一步步推理实现故障定位并给出相应的维护建议。

Once a fault symptom indicated by the EICAS is input, by inferring step by step, the expert system can locate it in the engine and provide some homologous constructive maintenance advice.

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最后，课题对发动机故障诊断专家系统进行了开发，并详细介绍了知识库的建立和维护、推理机制的设计等。

Finally, the thesis develops expert system of engine fault diagnosis, and introduces setting-up and maintenance of knowledge base, design of reasoning mechanism and so on in detail.

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本系统的基本功能分为知识表达、知识推理、知识获取和知识维护。

The basic function of the system included knowledge expressing, reasoning, acquisition, maintenance.

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