Research On Motor Controller Of In-Wheel For Electric Test Vehicle

With the continuous development of the automobile industry,environmental pollution and energy crisis is becoming more and more serious.Pure electric vehicle has become a hot spot in the research and development of automotive industry.In electric vehicle driving various ways,the electric vehicle driven by in-wheel motor out of the limitations of traditional fuel cars in structure,with high energy efficiency,simplifying the body structure,driving a variety of advantages.In this paper,according to the current research hotspots,with wheel-type brushless DC motor as the control object,based on CAN with the in-wheel motor controller research and design with micro-controller dsPIC30F4011 as the core to match the electric test vehicle on the master control system of the in-wheel motor control system.Based on the internal structure and operation principle of the wheel-type brushless DC motor,this paper analyzes the voltage regulation and torque control strategy of the motor,and adopts the scheme of double closed-loop control of the motor speed.In-wheel motor controller hardware circuit uses modular design,the whole system is divided into control module,power drive module,CAN transceiver module and power supply module circuit,etc.The control module uses the motor-specific control chip dsPIC30F4011,its inherent CAN communication interface directly communicate with the vehicle controller,comply with the design concept of automobile network control.Power drive module circuit according to the motor parameters,use IRS2186(S)as the driver chip,power MOSFET choose IPP120N10S4-05 formed a 24 tube power inverter bridge.In the aspect of software design,in-wheel motor controller driver and CAN communication program are designed,and expounds the PWM control signal,position detection,speed calculation and double closed-loop control program,etc.For CAN communication software design,the choice is based on CAN 2.0 B protocol standard data to develop its own application layer communication protocol.And on this basis,the CAN communication message sending and receiving process of the motor controller node is designed.Then,the Simulink simulation model of double closed-loop control system with motor speed is built based on the mathematical model of the motor,and the simulation results of the model are analyzed.The simulation model of the double closed-loop control system of the motor speed is built by MATLAB/Simulink,the no-load steady-state running test of the motor is carried out and the partial output waveform of the motor control system is observed and analyzed.The actual vehicle running test is conducted in the in-wheel motor drive electric test vehicle by using of the CAN bus communication control circuit board and the CAN bus protocol which is designed.The in-wheel motor running data is collected during the electric test vehicle running.Through the simulation and experimental results analysis shows that double closed-loop control strategy and CAN bus control system can meet the expected demand and the motor operating requirements.