基于模糊PID电流跟踪控制的EPS仿真分析

Electric power steering simulation analyze based on Fuzzy PID current tracking control

在对电动助力转向系统(EPS)结构分析的基础上,结合汽车动力学特性建立EPS数学模型,依靠Simulink平台搭建了EPS系统仿真模型.本文采用模糊自适应PID控制策略对电机目标电流进行跟踪控制,并且为抑制路面干扰对电机电流采取了补偿措施.在不同路面和不同车速下对系统的常规助力控制,阻尼控制进行仿真分析,仿真结果表明了该控制策略的有效性和实用性,目标电流跟踪效果良好.与无助力系统相比,汽车方向盘操纵转矩明显降低,驾驶员获得了良好的转向路感,系统能有效抑制颠簸路面对方向盘的冲击.

Through analyzing of the electric power steering （ EPS ） structure and union the vehicle dynamic characteristics, this paper establishes a mathematical model of EPS.And the EPS system simulation model based on Simulink is built.The fuzzy self-adaptive PID control strategy is adopted to control the actual current of the motor tracking precisely the target current, and the motor current compensation that for inhibition of road surface disturbance is taken.Conventional assist control and damp control that apply to the system with the different road and different speed are simulated and analyzed.The simulation results show that this strategy is effective and practical target current tracking effect is better; The vehicle of steering moment decrease apparently compare with the non-assistant power system;The driver could get seemly road feel;The wallop to steering wheel is restrained effectively when the vehicle is driving on the uneven road.