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将AR（n）时序模型处理方法应用于内燃机活塞-气缸磨损故障和排气阀漏气故障的诊断中，对有关问题如定阶检验、FFT功率谱和AR（n）自回归谱的各自特点等作了讨论。
The AR (n) time series model processing method is applied in the diagnosis of internal combustion engine piston-cylinder wear failure and exhaust valve air leak failure. The related problems such as the rank test, FFT power spectrum and AR (n) autoregression spectrum For discussion.