电动汽车转矩定向分配差速器建模与动态仿真

本文中提出一种新型具备转矩定向分配功能差速器的集中式电驱动桥系统。该集中驱动系统可以在不改变总驱动转矩的条件下,类似分布式驱动方式实现驱动转矩在左右轮间的任意分配,从而产生改变车辆横摆动力学的直接横摆力偶矩。首先,分析了转矩定向分配差速器结构特点及其工作原理;其次,利用键合图理论建立了其动力学模型,并仿真分析了其动态响应特性;然后,设计了转矩响应控制系统以改善该差速器的动态性能;最后,嵌入整车模型进行了联合仿真。结果表明,装备该差速器的车辆可任意分配左右轮驱动转矩,并有效改善车辆操控特性。

Modelling and Dynamic Simulation of Torque Vectoring Differential for EV

A centralized electric drive-axle system having a novel differential with torque vectoring function is proposed.This centralized drive system can achieve arbitrary distribution of driving torque between the left and right wheels like the distributed drive-style,without changing the total driving torque,so as to generate a direct yaw moment which can change the yaw dynamics of the vehicle.Firstly,the structural characteristic and working principle of the torque-vectoring differential is analyzed.Secondly,the dynamics model is established by using the bond-graph theory,and its dynamic response characteristics are analyzed by simulation.Then,the torque response control system is designed to improve dynamic performance of the proposed differential.Finally,it is embedded into the vehicle model to implement joint simulation.The results show that the vehicle equipped with the proposed differential can distribute arbitrarily the driving torque between the left and right wheels,and the vehicle handling performance is effectively improved.