The Research On Driving Motor Control System For Extended Range Electric Vehicle

With the progress of human civilization, the global energy crisis is increasing and the human living environment is deteriorating. Fuel vehicle emissions is an important factor in the current environmental issues. Compared with the traditional fuel vehicles, the extended range electric vehicle alleviate the world's energy crisis and global environmental issues, because of its better fuel economy and lower emissions. So more and more attentions are paid to the related research for its significant.In this paper, associated with the relevant research status of electric vehicles, the drive motor control system of electric vehicles are researched. Motor control technology is one of the key technologies for extended-range electric car, the drive motor control system is the power core unit of extended-range electric vehicle. Efficient and feasible control strategies directly affect the dynamic performance and fuel economy of electric vehicle. High-efficiency, high-performance permanent magnet synchronous motors become mainstream of electric vehicle drive motor. Therefore, we use permanent magnet synchronous motor as the drive motor for extended-range electric vehicle.Extended range electric vehicle drive control technology of permanent magnet synchronous motor is the study focus of this dissertation. First, a brief introduction for the permanent magnet synchronous motor is presented, based on the principle of coordinate transformation the mathematical models of permanent magnet synchronous motors in each coordinate system are obtained, and the vector control model for the permanent magnet synchronous motor is built in MATLAB/Simulink to lay the foundation for the later improved control strategy. Then, based on the principle of sliding mode control with variable structure and mathematical model of permanent magnet synchronous motors, the sliding mode control of permanent magnet synchronous motor is researched in this dissertation. Because of the time lag, the space lag and other reasons, there is a big shake vibration for the drive motor control system based on the traditional sliding mode observer. To solve this problem, we take some measures such as replacing the switching function with the function of the Sigmoid, optimizing current observer and adding the segmentation phase compensation, to improve the traditional sliding mode observer. An improved sliding mode observer based on no position vector control technology are proposed.Secondly, based on MATLAB/Simulink in permanent magnet synchronous motor vector control model, the establishment of a position sensorless permanent magnet synchronous motor control system model based on sliding mode observer, and two control strategies are simulated. Through multiple sets of simulation experiments, and their corresponding experimental waveforms were analyzed. The simulation results show that:improved sliding mode observer control method of the motor control system has good dynamic performance, improve the accuracy of observation, ability to enhance the anti-chattering.Finally, based on TI's motor control kit and DSP control chip, motor drive control system platform for permanent magnet synchronous motor is built, and the experimental test are did on the drive motor control system experimental platform. The experimental results indicate that the control strategy based on improved sliding mode observer for extended range electric vehicle permanent magnet synchronization motor with a strong practicability.