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对瞬时转速波动进行了仿真分析计算 ;实测了发动机的瞬时转速 ;对比了实测与仿真计算的瞬时转速波形 ,两者相当一致 ;讨论了影响瞬时转速测量精度的关键因素 ;提出利用瞬时转速进行故障诊断的特征参数及判据 ,并在诊断 4 1 2 0 SG型柴油机气门漏气故障中得到证实 .
The instantaneous speed fluctuation is simulated and analyzed. The instantaneous speed of the engine is measured. The instantaneous speed waveform of the actual measurement and simulation is compared. The two are quite consistent. The key factors affecting the measurement accuracy of instantaneous speed are discussed. Diagnostic parameters and criteria of diagnosis, and in the diagnosis of 4 1 2 0 SG diesel valve valve leak was confirmed.