电子差速系统轮胎附着特性模拟仿真研究

电子差速系统相对于传统的机械式差速器可以实现转矩的精准分配,根据轮胎的纵向运动特性以及侧向运动特性,结合轮胎滑移率让内外侧车轮在过弯时拥有足够的附着力,减小整车的横摆角速度,提高过弯稳定性。采用后轮双电机的驱动方案,驱动电机采用直接转矩控制的方法,由整车控制器将指定的计算转矩信号发送给电机控制器完成动力分配,所需转矩根据驾驶员的加速踏板及方向盘转角,运用阿克曼转向模型计算得到。

Simulation Study on Tire Adhesion Characteristics of Electronic Differential System

Compared with the traditional mechanical differential mechanism,the electronic differential system can achieve accurate distribution of torque.According to the longitudinal and the lateral motion characteristics of the tire,combined with the slip rate of the tire,the inner and outer wheels have sufficient adhesion during cornering,so as to reduce the vehicle’s yaw angle speed and improve cornering stability.The driving scheme of double motors for rear wheels is adopted.The driving motor adopts the direct torque control method.The vehicle controller sends the specified calculated torque signal to the motor controller to complete power distribution.The required torque is calculated according to the driver’s accelerator pedal and steering wheel angle by using ackerman steering model.