基于主动脉冲后轮转向的侧翻稳定性仿真与试验

Simulation and Test of Rollover Stability Based on Rear Wheel Pulsed Active Steering

本文中提出了一种新的后轮主动脉冲转向技术来提高车辆的侧翻稳定性能,并对其进行仿真分析和试验研究。首先,设计液压脉冲发生系统,并分析其运行对悬架参数和后轮转向角度的影响,基于实验SUV车辆建立多自由度的车辆侧翻动力学模型,并分析不同脉冲参数对车辆侧翻性能的影响,确定最优的脉冲参数;接着,提出车辆侧翻动态稳定指标,设计相应的控制策略,并基于Car Sim和Simulink进行联合仿真分析;最后,在实验SUV车辆上安装液压脉冲发生器,进行整车试验。仿真和试验结果表明:所提出的策略不仅可以降低车辆侧倾因子和侧倾角,有效改善车辆的抗侧翻能力,且能减少质心侧偏角和侧向加速度,提高车辆的横向稳定性。

To improve the rollover stability performance of vehicle, a novel rear wheel pulsed active steeringtechnique is proposed, simulated and tested in this paper. Firstly, a hydraulic pulse generation system is designedand the effects of its operation on suspension parameters and rear wheel steering angle are analyzed. A multi-DOFvehicle rollover dynamics model is established based on an experimental SUV and the effects of different pulse parameterson the rollover stability performance of vehicle are analyzed, with the optimal pulse parameter determined.Then a vehicle dynamic rollover stability indicator is proposed with its corresponding control strategy devised, and aCarSIM/Simulink co-simulation is conducted. Finally the hydraulic pulse generator designed is installed on experimentalSUV to perform vehicle tests. The results of simulation and tests show that the strategy proposed can not onlyreduce the rollover factor and roll angle of vehicle, effectively improving the rollover resistance of vehicle, but alsolower the sideslip angle and lateral acceleration of mass center, enhancing the lateral stability of vehicle.