分离路面上车辆紧急制动时稳定性分析与控制

传统的制动防抱死系统在分离路面上紧急制动时制动效能不尽理想,四通道ABS能够产生最大的制动力但却容易跑偏,而侧向稳定性较好的三通道ABS将增加制动距离.针对这种情况,提出了采用基于四通道ABS的主动前轮转向控制系统,该方法将在最大限度地提高车辆纵向制动力的同时保持车辆的侧向稳定性.建立了一个基于虚拟样机的全功能多体动力学模型,采用联合仿真的方法对车辆在分离路面上高速紧急制动过程进行了动力学仿真.仿真结果表明,提出的控制策略能够提高车辆在分离路面上紧急制动时的侧向稳定性.

Analysis and Control of Vehicle Emergency Braking Stability on Split-mu Road Surfaces

Braking efficiency is unsatisfactory on split-mu road surfaces for vehicles equipped with conventional anti-lock braking systems.Conventional four-channel ABS braking on this type of road surface causes the vehicle to deviate from the desired direction,and three-channel ABS increases stopping distance.An active front steering control was designed to improve lateral stability while braking on split-mu road surfaces with four-channel ABS,thereby producing maximum braking force.A full function vehicle model was designed and assembled,and dynamic analysis was performed using multi-body dynamics software and Simulink for split-mu road surfaces where one side of the road was a strip of ice and the other side dry asphalt.Simulation results show that active front steering improves vehicle lateral stability under braking on split-mu road surfaces.