摘要
电动助力转向系统(EPS)直接影响到汽车的操纵稳定性。建立了汽车二自由度动力学模型和EPS模型,包括转向盘和转向柱输入轴子模型、电动机模型、输出轴子模型和齿条子模型,设计了EPS模糊控制系统结构及其控制策略。模糊控制器依据汽车行驶速度、转向盘操纵转矩与理想操纵转矩之差及其变化率得到助力转矩。进行了转向盘转角角阶越输入仿真计算和EPS台架试验验证,经过模糊控制的EPS车辆最大操纵转矩下降了42.74%,提高了车辆转弯时的操纵轻便性,结果证明了模型的正确性和控制策略的有效性。
Electric power steering system（EPS） directly affects vehicle handling and stability.We establish an EPS model and a two-DOF（degree of freedom） vehicle dynamic model which include the steering wheel and steering column input shaft submodel,the motor model,and the output shaft and rack submodel.An EPS control system based on fuzzy control theory and its control strategy are designed.The power torque is obtained in accordance with vehicle speed,the difference and its rate of change between control torque and ideal control torque of steering wheel by fuzzy controller.Simulation of steering wheel angle step input and EPS bench test are carried out.It is shown that the maximum steering torque of vehicles with EPS by fuzzy control decreases by 42.74%,the controllability and stability of the vehicles are improved,and the validity of the model and the effectiveness of the control strategy are verified.
出处
《中国科技论文》
CAS
北大核心
2012年第11期813-817,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(50875112)
江苏省高校自然科学基金资助项目(11KJB580001)
关键词
电动助力转向系统
模糊控制
操纵稳定性
台架试验
electric power steering system（EPS）
fuzzy control
handling and stability
bench test
