关键词: 电动液压助力转向, 助力特性曲线, 设计, 仿真

Abstract: The assist characteristic curve of EHPS was analyzed and the function of the curve was given． For designing the assist characteristic curve of EHPS，the relationship of the steering assist power， torque on steering wheel and steering resistance torque from ground was analyzed，and the model of steering resistance torque from ground was built． By building all parts of models of EHPS，motor rotating speed was deduced and the 3 － D assist characteristic curve map of motor speed， steering wheel angular velocity and vehicle speed was plotted． For applying the assist characteristic curve to practice，BP neural network was used to optimize the assist characteristic curve，and then the assist characteristic curve under any vehicle speed was obtained． Simulation of the EHPS verified this assist characteristic curve having a good performance．

Key words: EHPS, assist characteristic curve, design, simulation