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电喷发动机的故障定位目前常用故障码及专家系统辅助分析法，这２种方法定位的准确性还不太理想．本文提出一种基于替代比较法原理的计算机硬件仿真法．理论分析和初步的试验结果表明：仿真替代式故障定位法是一种独特、有效的方法．
EFI engine fault location commonly used fault codes and expert system-assisted analysis, the accuracy of these two methods of positioning is less than ideal. This paper presents a computer simulation method based on the principle of alternative comparison method. Theoretical analysis and preliminary test results show that simulation of the alternative fault location method is a unique and effective method.