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PID控制混合动力电动汽车(HEV)动态过程,要达到控制要求时,力矩可能超出设计范围。提出了采用Smith预估器控制动态过程;该办法能克服大纯滞后,增强控制系统稳定性。SIMULINK仿真表明,其控制效果优于常规PID控制。在相同的条件下,阶跃响应时间短,而且所需要力矩小,使得动态过程控制更易于实现。可见Smith预估器具有更好的稳定性和鲁棒性,对于大时间滞后系统是一种比较实用的控制方法,更加适合于HEV控制。
PID controls HEV dynamic processes, which may be out of design to meet control requirements. A Smith predictor is proposed to control the dynamic process. This method can overcome the large lag and enhance the stability of the control system. SIMULINK simulation shows that the control effect is better than the conventional PID control. Under the same conditions, the step response time is short, and the torque required is small, making the dynamic process control easier to implement. Visible Smith predictor has better stability and robustness, is a more practical control method for large time lag system, more suitable for HEV control.