基于Gim轮胎的四轮驱动汽车牵引力控制地面驱动力修正方法

摘要

In the study of four-wheel drive vehicle traction control system, there is a deviation regarding the tire longitudinal force from Gim tire model as ground driving force directly. A correction method for ground driving force was proposed, and simulations on both high and low adhesion coefficient ground were carried out to simulate the influence on the vehicle velocity with the deviation of ground driving force. The simulation results show that the deviation of ground driving force is almost zero on the high adhesion coeffi-cient road. But on the low adhesion coefficient road, the deviation of ground driving force has a significant influence on vehicle velocity. There is a larger deviation of ground driving force on the low adhesion coefficient road, which significantly affects the control precision of the four-wheel drive vehicle traction control system. The proposed correction method for ground driving force improves the accuracy of the traction control system.%针对四轮驱动汽车牵引力控制系统的研究，直接将Gim轮胎模型得出的轮胎纵向力作为地面对轮胎的驱动力存在偏差。提出了地面驱动力的修正方法，并在高、低附着系数路面模拟地面驱动力偏差对车速的影响。仿真结果表明，高附着系数路面上地面驱动力偏差几乎为0；低附着系数路面上地面驱动力偏差对整车车速的影响显著；低附着系数路面存在着较大地面驱动力偏差，显著影响到四轮驱动汽车牵引力控制系统的控制精度，所提出的地面驱动力修正方法提高了牵引力控制系统的准确性。