Design And Control Strategy Of Drive System In Electric Vehicle

Electric vehicle has the characteristics such as complicated operating conditions, harsh environment and high power density. In order to ensure the comfort, efficiency and security when driving, many researchers have raised a lot of high-performance control algorithms based on the actual situation of EV and added the fault-tolerant control strategies in control algorithms to enhance the safety performance of the car.It’s necessary to use high-performance control strategies to make the driver feel comfortable and improve the efficiency of the system. This paper has done theoretical analysis of V/F algorithm based on SVPWM and rotor field-oriented vector control, meanwhile MATLAB/Simulink is used to simulate these algorithms. Drive system will inevitably malfunction while EV is long-running. When failure happens, EV must operate normally or limp to a safe area to ensure people’s safety. In this paper, a fault-tolerant method is analysed when the current sensor and speed sensor are out of work. The phase angle compensation method is used to reduce the shock of current and torque when rotor field-oriented vector control is switched to V/F control, and simulation is done in MATLAB/Simulink.A7.5kW controller is developed based on digital signal processor TMS320F28335according to the requirement of experiment, and this paper analyses its hardware architecture. C language is used to program for motor control algorithm implemented on this bench, and software structure is hierarchical. The experimental plat uses the CAN bus to communicate with upper computer to display and collect data. The correctness of the algorithm and feasibility of the simulation model is verified through analysing data and result of experimental.