本文应用模糊数学理论,建立了发动机故障辅助诊断的综合评判模式,并对模糊关系矩阵进行计算机优化。通过程序设计,实现了既能进行故障诊断,又能在不增加计算机内存的情况下,随机对大量经验进行总结、深化和保存的目的。对国产拖拉机发动机故障进行微电脑辅助诊断结果,取得了诊断准确率高和诊断速度快的满意效果。本文是微电脑辅助诊断系统在拖拉机发动机上的实际应用,在其他复杂设备上也可以应用。 In this paper, the fuzzy mathematics theory is used to establish a comprehensive evaluation model of engine fault diagnosis, and computer optimization of the fuzzy relation matrix is ​​carried out. Through program design, it realizes the purpose of not only diagnosing faults but also summing up, deepening and preserving a large amount of experiences randomly without increasing the memory of the computer. The microcomputer-assisted diagnosis of domestic tractor engine failure has achieved satisfactory results of high diagnostic accuracy and rapid diagnosis. This article is the practical application of microcomputer-aided diagnosis system on the tractor engine, which can also be applied on other complex equipment.