A Novel 4WD Electric Vehicle Control Strategy Based on Direct Torque Control Space Vector Modulation Technique

Four-Wheels-Drive (4WD) electric Vehicle (EV) controlled with Direct Torque Control based Space Vector Modulation (DTC-SVM) is presented, where the electrical traction chain was well analyzed and studied from the lithium battery, the buck boost to the mechanical load behavior. The speed of four wheels is calculated independently during the turning with the electronic differential system computations which distributes torque and power to each in-wheel motor according to the requirements, adapts the speed of each motor to the driving conditions. The basic idea of this work is to maintain the initial battery state of charge (SOC) equal to 70% and the prototype was tested in several topology conditions and under speed. The simulations carried in Matlab/Simulink verified the efficiency of the proposed DTC-SVM controller, and show that the system has more favorable dynamic performance. Results also indicate that this strategy can be successfully implemented into the traction drive of the modern 4WD electric vehicles.

四轮驱动混合动力汽车整车控制器设计

基于兼具ISG起动电机和轮毂电机的四轮驱动混合动力汽车结构平台,利用MC9S12DP512单片机作为控制器的CPU,设计了CAN通讯网络结构、输入输出和看门狗应用电路,并增强了电源的EMC设计。在CodeWarriorV4.5开发环境下编写了底层驱动程序,并进行了现场测试。结果表明,电机转矩变化迅速,可以满足整车转矩的瞬时要求,验证了该控制器的可靠性和通用性。