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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。
In order to study the importance of the key technologies such as the control strategy of EPS system and the assist characteristic of the electric vehicle on the steering stability and the road feel of the vehicle, the EPS system dynamic model and the three-DOF steering dynamics model are established. The control strategy of EPS system based on curve-type assist characteristic is designed. Serpentine experimental simulation. The results show that with the increase of vehicle speed, the steering stability and the road feel of the vehicle decrease along with the increase of the vehicle speed during the snake experiment. Moreover, the curve-like assist characteristic has the advantage of reaching the ideal balance point between steering lightness and road feeling . It has important engineering significance for guiding the development of EPS system, taking into account the lightness and road feel of the vehicle, improving the steering stability and safety of the vehicle, and developing the integrated control system of the electric vehicle and its chassis.