基于模糊控制的EPS车辆操纵稳定性研究

Research on Vehicle Handling and Stability with EPS Based on Fuzzy Control

摘要:

电动助力转向系统(EPS)通过电动机提供助力转矩,协助驾驶员进行转向操纵;在EPS动力学分析的基础上,建立了EPS和汽车二自由度动力学模型,设计了基于模糊控制理论的EPS控制系统及其控制策略,在Simulink中搭建EPS及其模糊控制系统模型,得到汽车车身侧偏角和横摆角速度仿真结果;计算结果表明,与无助力的机械式转向系统相比,装备EPS的车辆车身侧偏角的峰值和标准差分别减少了18.8%和19.1%,具有更好的汽车操纵稳定性。

Abstract:

The torque was provided by the electric motor of electric power steering system (EPS) to assist driver steering. EPS and vehicle two degrees of freedom dynamic model were established on the basis of kinetic analysis of EPS, EPS control system based on fuzzy control theory and its control strategy were disigned. The EPS and its fuzzy control system model were established in simulink, vehicle body side slip angle and yaw rate graphics were obtained. The simulation analysis showed that, peak and standard deviation vehicle side slip angle were decreased by 18.8% and 19.1%, vehicle handling and stability were improved significantly by EPS compared with the mechanical steering systems.