Rollover of commercial heavy vehicles can cause enormous economic losses and fatalities.It is easier for such vehicles to rollover if the driver’s steering frequency is close to the critical frequency of the vehicle...Rollover of commercial heavy vehicles can cause enormous economic losses and fatalities.It is easier for such vehicles to rollover if the driver’s steering frequency is close to the critical frequency of the vehicle’s roll motion;however,the critical roll frequency has rarely been investigated.In this study,the second-order transfer function between the steering input and roll angle was developed to calculate the critical frequency of the vehicle’s roll motion.The simulated spectrum and transfer function were then used to dynamically predict the peak lateral load transfer ratio.Laboratory experiments were conducted using a scaled vehicle to verify the critical roll frequency.The results suggest that the peak value of the lateral load transfer ratio during steering can be accurately determined from the driver’s input,and the critical roll frequency has a dominant effect on the dynamic rollover of heavy vehicles.展开更多
文摘通过线控转向(Steer-by-Wire,SBW)系统控制汽车方向盘转角提高某汽车在极限行驶中抗侧翻能力.建立SBW整车模型,基于紧急避让、紧急掉头和蛇行运动等3种危险操纵稳定性工况分析,得出该车易侧翻的结论.提出基于横向载荷转移率(Lateral Load Transfer Ratio,LTR)的车辆动态防侧翻控制算法,通过SIMULINK与Car Sim的联合仿真平台,建立转向优化控制模型.仿真结果表明在典型工况下该车防侧翻性能得到明显改善.
基金Supported by Major Program of the National Natural Science Foundation of China(61134004)Doctorate Foundation of Northwestern Polytechnical University(CX 200912)
基金supported by the National Natural Science Foundation of China(NSFC)under Grant 51905483.
文摘Rollover of commercial heavy vehicles can cause enormous economic losses and fatalities.It is easier for such vehicles to rollover if the driver’s steering frequency is close to the critical frequency of the vehicle’s roll motion;however,the critical roll frequency has rarely been investigated.In this study,the second-order transfer function between the steering input and roll angle was developed to calculate the critical frequency of the vehicle’s roll motion.The simulated spectrum and transfer function were then used to dynamically predict the peak lateral load transfer ratio.Laboratory experiments were conducted using a scaled vehicle to verify the critical roll frequency.The results suggest that the peak value of the lateral load transfer ratio during steering can be accurately determined from the driver’s input,and the critical roll frequency has a dominant effect on the dynamic rollover of heavy vehicles.
