基于差动制动的SUV防侧翻控制仿真研究

摘要

在汽车行驶安全性研究中,为提高SUV极限行驶性能中的抗侧翻能力,建立了一种差动制动的防侧翻控制方法.建立了三自由度SUV侧翻模型,并在SUV侧翻模型的基础上推导出横向载荷转移率,作为汽车的动态侧翻性能指标,用来定量的表示汽车的侧翻稳定性能,并用特定值作为控制系统的触发因子,从而在符合控制条件时通过PID控制器对侧向加速度差值进行控制,进而进行制动力的分配,实现差动制动控制.以Matlab/Simulink和CarSim仿真软件作为仿真平台对SUV防侧翻控制系统进行联合仿真,仿真结果表明在典型工况下SUV防侧翻性能得到有效改善,横向载荷转移率值降低12.5%左右.实验证明,研究结果对SUV防侧翻控制系统的设计具有一定参考价值.%In order to improve the rollover stability in extreme driving situation of the goal SUV,a differential braking control strategy was proposed in this paper.A SUV rollover model of three freedom degrees was established,and on this basis this paper chose Lateral-Load Transfer Ratio (LTR) as the dynamics performance to indicate the rollover stability of the vehicle.When the system detects the danger of rollover,the controller will be triggered by LTR,and then differential braking will brake the wheel for rollover prevention.The software toolbox of Matlab/Simulink and CarSim was used to simulation the mode.The results show that the differential braking control system for SUV designed in this paper can steady the rollover motion.And the simulation results show that the study has certain reference value for the practical application of prevent system of SUV.