具有变传动比功能的客车电液复合转向系统机理研究

The transmission ratio of the existing steering system for the passenger car can not be changed, and the electric power steering and electro-hydraulic power steering provide the power alone is difficult to coordinate the driver’s steering sense and the vehicle’s steering economy. Aim at these problems, this project proposes an electro-hydraulic compound steering system with variable transmission ratio. Therefore, it will be the main developing direction of passenger car's power steering technology in a certain period of the future. In this project, the dynamic model of electro-hydraulic compound steering system and whole vehicle is established firstly. Secondly, the control laws of variable transmission ratio and stability control of active steering intervention under different working conditions are revealed. Then, considering the bandwidth and dynamic response rate of the motor and hydraulic actuator, the torque coordination control strategy of the compound steering system is formulated to satisfy the steering road sense, steering stability and steering economy. Finally, the subjective and objective test evaluation method of electro-hydraulic compound steering system is constructed. Through the research of the above contents, it can provide a theoretical basis and technical support for the design and development of the passenger car’s electro-hydraulic compound steering system.

针对现有客车转向系统传动比固定不可改变，以及电动助力转向和电动液压助力转向单独助力时难以协调转向路感和转向经济性之间矛盾的问题，本项目提出一种具有变传动比功能的客车电液复合转向系统，将是未来一定时期内客车动力转向技术的主要发展方向。本项目建立电液复合转向及整车系统动力学模型，揭示不同工况下系统变传动比控制规律以及主动转向干预稳定性控制规律，考虑两套转向执行机构的带宽和动态响应速度等因素，制定满足转向路感、转向稳定性和转向经济性等多个目标的复合转向系统转矩协调控制策略，构建电液复合转向系统的主客观试验评价方法。通过上述问题的研究，为客车电液复合转向系统的设计与开发提供理论基础和技术支持。

针对现有客车转向系统传动比固定不可改变，以及电动助力转向和电动液压助力转向单独助力时难以协调转向路感和转向经济性之间矛盾的问题，本项目提出一种具有变传动比功能的客车电液复合转向系统。本项目建立了电液复合转向系统与整车系统动力学模型，探索了电液复合转向系统变传动比控制规律，分析了电液复合转向系统机电液耦合机理，研究了电液复合转向系统的转矩协调控制，开展了电液复合转向系统的多学科不确定性优化设计，开发了具有变传动比功能的电液复合转向系统的试验样车和硬件在环仿真平台，进行了硬件在环仿真试验和实车性能试验。本项目发表SCI检索论文8篇（其中II区以上SCI论文6篇）；出版专著1部；授权发明专利9件。依托该项目，项目负责人为第二完成人获得江苏省科学技术一等奖1项。此外，项目负责人为第二指导教师，指导学生获得中国国际“互联网+”创新创业大赛高教主赛道、产业赛道、国际赛道的5项国赛金奖。通过上述问题的研究，为客车电液复合转向系统的设计与开发提供理论基础和技术支持。