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本文在灰色理论基础上提出了诊断柴油机故障的灰色优劣关联度法，并用于６Ｅ３９０柴油机的工况评价和故障诊断，收到了良好的效果。
In this paper, based on the gray theory, a gray relational method of gray fault diagnosis for diesel engine is put forward and applied to the condition evaluation and fault diagnosis of 6E390 diesel engine, and the good results are obtained.