【摘要】 为了充分发挥四轮独立电驱动型式在直接横摆力矩控制系统中对改善车辆动力学性能的优势,提出了一种新的全轮纵向力优化分配方法。基于四轮独立驱动特点建立了侧重提高稳定性和侧重改善机动性的两种目标函数,分别用于降低整车路面附着负荷和降低整车横摆响应滞后。综合直接横摆力矩需求、地面附着及电机驱动限制得出全轮纵向力优化分配的约束条件。基于模糊理论设计了以车辆质心侧偏角为变量的权重函数,并对约束优化两种目标函数得出的纵向力分配值进行实时动态调整。该方法进一步提高了车辆在直接横摆力矩控制下的整车路面附着潜力并改善横摆响应速度,提升了车辆稳定性和机动性。更多还原

【Abstract】 A tire longitudinal force optimization distribution method was developed to take full advantage of the four wheel independent electric drive with direct yaw control.The characteristics of the four wheel independent electric drive were used to develop two target indexes with vehicle stability and vehicle maneuverability as top-priorities.The first index increases the vehicle grip margin while the other quickens the vehicle yaw response.The two target indexes are then optimized based on the constraint conditions deduced from the yaw control requirement,the road adhesion limit and the motor traction ability.Fuzzy weighting using the side slip angle dynamically regulates the optimization results to increase the vehicle-road adhesion potential and reduce the vehicle yaw motion delay.更多还原