Be aimed at the characteristic of the fault influencing to exhaust, building the fault diagnosis expert system through idea and method of the analyzing exhaust gas emission component is researched.

并针对影响汽车排放的故障的特点，通过废气排放成分分析的诊断思路及方法，对构建尾气分析专家系统进行了研究。

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Practical methods of on-site diagnosis and internal leakage prevention are presented through an analysis in the mechanism of internal leakage in hydraulic system.

本文通过对液压系统故障机理的分析，比较全面地提出了现场诊断和预防内漏故障的实用方法。

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Through study of the testing technique for oil feed circuit and designing principle of data fusion, the realization of fault test and diagnosis for hydraulic system was illustrated.

通过对液压系统供油回路的信号测试过程及信息融合方案的设计分析，阐明了液压系统故障检测和诊断的实现过程。

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