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为了诊断铲运机液压系统的故障，针对ＣＹ９２２Ｄ型铲运机，采用ＰＲＯＬＯＧ语言建立了人工智能专家诊断系统，该系统应用上下文树分析的理论和逐步细分的方法，可进行逐项检测，层层排除，直到查出故障。
In order to diagnose the failure of hydraulic system of scraper, artificial intelligence expert diagnosis system is established in PROLOG for the CY922D scraper. The system uses the theory of context tree analysis and the method of subdivision step by step, Layer exclusion until detected fault.