车辆SAS/EPS集成控制系统满意优化研究

Satisfactory Optimization Design of Integrated Control System for Vehicle's SAS and EPS

基于满意优化理论,建立了半主动悬架与电动助力转向集成控制系统的数学模型,提出了半主动悬架与电动助力转向集成控制系统满意优化策略,设计了半主动悬架与电动助力转向集成控制系统及实车道路试验系统。在仿真的基础上,进行了半主动悬架与电动助力转向集成控制系统实车道路试验,分析了半主动悬架与电动助力转向集成控制系统对车辆动态性能的影响,计算和试验结果基本吻合,前悬架动挠度的峰值和标准差分别降低了14.00%和14.56%,意味着悬架对车身的冲击变小;而轮胎动位移峰值降低了11.34%,轮胎接地性能提高;横摆角速度和侧倾角峰值分别降低13.60%和14.41%,标准差分别降低15.80%和16.08%,提高了汽车的操纵稳定性。

Conventional optimization theory cannot work without the optimal solution. In order to improve this situation, a mathematic model for the design of semi-active suspension （SAS） and electric power steering （EPS） integrated control system was established based on satisfactory optimization theory. Then the satisfactory optimization method of SAS and EPS integrated control system was proposed. On this basis, SAS and EPS integrated control system and real vehicle road test system were designed. Real vehicle road test was conducted based on the simulation and then the effect on the dynamic performance of car was analyzed. The results show that the theoretical research is consistent with the test results. The peak value and the standard deviation of the front suspension deflection are reduced by 14.00% and 14.56% , respectively, meaning that the impact of suspension on the car-body become smaller. The peak of tire displacement is reduced by 11.34% so that the tire-ground performance is increased. The peaks of the suspension yaw acceleration and the roll angle are decreased by 13.60% and 14.41% , respectively. And their standard deviations are decreased by 15.80% and 16.08%, respectively, which means that the car＇s handling stability is greatly enhanced.