Smith预估器控制混合动力电动汽车动态过程的仿真

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.

Simulation of Hybrid Electric Vehicle (HEV) Dynamic Process

The torque may exceed designing value when dynamic processes of Hybrid Electric Vehicle (HEV) are controlled using PID. Smith control system is provided to control Hybrid Electric Vehicle (HEV) dynamic process, and the method can overcome time lag, and can increase the stability of system. Simulation shows, the method is better than PID. In same condition, step response time is shorter, and torque required is smaller, so the method makes the control easier. So Smith control system has stability robustness better, and is adaptive to control time lag, and is better for HEV control.