为了研究电动汽车EPS系统控制策略和助力特性等关键技术对汽车的操纵稳定性和转向路感的重要性,建立了EPS系统动力学模型和汽车三自由度转向动力学模型.设计了基于曲线型助力特性的EPS系统控制策略.进行了蛇形实验仿真.结果表明:蛇形实验过程中,随着车速的提高,汽车的操纵稳定性和路感随之降低；并且曲线型助力特性更具有在转向轻便性和路感之间达到理想的平衡点的优势.对于指导EPS系统的开发、兼顾汽车行驶的轻便性和路感、提高汽车行驶的操纵稳定性和安全性,以及对于电动汽车及其底盘集成控制系统的开发都具有重要的工程应用意义.%The control strategy is one of the key technologies of EPS system, and the assistance characteristic has great importance to the vehicle handiness and road feeling. Based on the EPS dynamic model and the 3-DOF full vehicle model, the EPS control strategy based on curved assistance characteristic is designed. Pylon course slalom situation is executed and the rusults shown that along with the increase in speed the handiness and road feeling are all decreased, and the curved assistance characteristic has the superiority to find the better balance between handiness and road feeling. It has engineering significance to the overall design, function enhancement and optimization and steering manipulation and safety improvement, and also to the electric vehicle and its integrated chassis control system development.
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