电动汽车电液复合稳定性控制器设计及分析

Design and Analysis of Electro-hydraulic Compound Stability Controller for Electric Vehicle

为提高电动汽车在极限工况下的稳定性能,设计一种电液复合稳定性控制系统。首先,搭建了电动汽车稳定性控制系统硬件在环仿真试验平台,该试验平台由硬件/软件部分组成。平台硬件部分主要包括:上位机、下位机、液压制动执行系统、PCI-6323采集卡;平台软件部分主要包括:CarSim建立的车辆多体动力学模型、Labview建立的车辆动力学控制模型、数据采集系统以及ESP泵控制系统。其次,通过设计电液复合稳定性控制策略,以整车路面负荷率最低为目标,进行驱动力/制动力优化分配,旨在最大幅度提高车辆稳定性裕度值。最后,选取正弦延迟工况进行仿真试验。结果表明:所设计的电液复合稳定性控制器,在极限工况下,明显提高了车辆操纵稳定性。

In order to improve the stability performance of electric vehicles under extreme conditions,an electro-hydraulic hybrid stability controller is designed.Firstly,a hardware-in-the-loop simulation test platform for the stability control system of electric vehicles is built.The test platform is composed of hardware/software.The hardware part of the platform mainly includes:upper computer,lower computer,hydraulic brake execution system,PCI-6323 acquisition card;platform software part mainly includes:vehicle multi-body dynamics model established by CarSim,vehicle dynamics control model established by Labview,data acquisition system,and ESP pump control system.Secondly,through the design of an electro-hydraulic composite stability control strategy,the optimal distribution of driving force/braking force is carried out with the minimum road load rate of the vehicle as the goal,so as to maximize the vehicle stability margin.Finally,select the sine delay condition for the simulation test.The results show that the electro-hydraulic composite stability controller can significantly improve vehicle handling stability under the limit conditions.