基于动态目标调整的汽车全轮纵向力分配的研究

A Study on Vehicle All-wheel Longitudinal Force Distribution Based on Dynamic Objective Adjustment

针对现有汽车稳定性控制系统中,汽车全轮纵向力分配算法在极端工况下出现轮胎力饱和,导致滑移率控制器过多介入而出现控制振荡和对控制目标的调整不合理等问题,提出了一种新的主动动态目标调整的全轮纵向力分配算法。该算法在极端工况下,根据车辆运动状态和路面附着状态,对直接横摆力矩控制目标Mzd和纵向驱动/制动力控制目标Fxd进行主动动态的调节。仿真结果表明,采用该算法解决了现有全轮纵向力分配算法的上述问题。

In view of the problems of vehicle all-wheel longitudinal force distribution algorithm in existing vehicle stability control system that under extreme conditions, the saturation of tire forces results in too much intervention of slip controller, leading to control oscillation and that the adjustment of control objectives is irrational, a novel all-wheel longitudinal force distribution algorithm with active dynamic objective adjustment is proposed. Under extreme conditions, the algorithm conducts active dynamic adjustment on the control objectives of direct yaw moment Mzd and longitudinal driving / braking force Fxd according to the states of vehicle movement and road adhesion. The simulation results show that with the new algorithm the above mentioned problems of current all-wheel longitudinal force distribution algorithm are all resolved.