Wheel Drive Electric Vehicle Based On Dsp Control

The two In-wheels Driven Electric Vehicle (EV) is one of the developing directions for further EVs. Its development has been synchronizing with that of the researching and industrializing of EVs in the world. Because of its perfect controlling performance and potential in engineering applications, more and more efforts have been devoted to the two In-wheels Driven EV by both academicians and engineers alike. This thesis strives to the comprehensive study of the DSP control system of a two In-wheels Driven EV.Firstly, the advantages of the permanent magnet brushless in-wheel motors used for this type of EVs are elucidated. The mathematical model of the permanent magnet brushless in-wheel motors is proposed and the performances of the aforementioned motors are studied using computer simulations.Secondly, using the whole control strategy and digital signal processing technique, the DSP based control system of a Two In-wheel Driven EV is developed. The system uses one DSP2407A chip to independently control the two driven motors, giving rise to a excellent controlling ability and a running stability of the controlled EVs.Moreover, a communication system using CAN and RS232 buses is designed and integrated in the control system for purposes of real-time monitoring, controlling, managing of the EVs operating states. The communication system has been tested and run functionally on an experiment platform.Thirdly, while studying the control system based on DSP, the main concerns are focused on the rotor position measurement, the phase current measurement and the energy feedback system design. More specially, a novel rotor position measuring method, the integrated rotor position measurement method, is designed; a measuring method for phase currents in the full-bridge chopper operation condition is proposed; and a prototype of the driven system of EVs with energy feedback capability is designed.Finally, the EMC problems associated with the PCBs of the designed hardware as well as the system level EMC problems of the whole vehicle is explored.