本文讨论了用CAR时间序列模型来辨识液压系统的阶和参数。文中提出了AIC定阶准则和辅助变量法结合,来确定模型阶和参数的方法,进一步根据估计参数的渐近正态性确定模型的子阶和时滞。文中应用该方法辨识了液压位置系统的阶和参数。仿真和实测阶跃响应比较,证明得到的辨识模型是有效的。 This article discusses the use of CAR time series models to identify hydraulic system steps and parameters. In this paper, we propose a method to determine the model order and parameter by combining the AIC order criterion and the auxiliary variable method, and further determine the sub-order and the time-delay of the model based on the asymptotic normality of the estimated parameters. The method is applied to identify the order and parameters of hydraulic position system. The comparison between simulation and measured step response proves that the identification model obtained is effective.