Research On Drive Control System For Electric Vehicles Based On TC1782

As the key technology of electric vehicle, the performance of motor drive system is related to the security, power and economy of the whole car. In this paper, the control system of Permanent magnet synchronous motor(PMSM) for electric car has been studied. Deciding control strategy combined with the characteristics of the electric vehicle, and making design scheme. The content mainly includes the following several parts:Firstly, the vector control method of PMSM has been studied. According to the actual working condition characteristics of electric car, such as acceleration, climbing, the speed and torque double closed-loop is chosed as the control method and the simulation model is built in Matlab/Simulink platform. The correctness of model is verified from the simulation results.Secondly, the hardware testing platform of the PMSM is bulit. The drive system hardware platform of PMSM is designed by IPM and 32-bit DSP TC1782 of Infineon, and the IPM is used as the driving module, and the DSP is used as the core of controller. The General purpose timer array(GPTA) and High Tec are used to realize the voltage space vector algorithm, and the main program and interrupt program are designed. From experimental results, the motor drive system designed in the paper can realize the precise speed and torque control of PMSM, and meet the requirements of the driving technology for electric vehicles.Thirdly, In order to meet the requirements of safety design for automobile safety function ISO26262, a sensorless speed estimation algorithm based on sliding mode observer(SMO) is proposed. The algorithm, redundancy design, can ensure the system work normally when resolver or its decoding chip is failure. The Matlab/Simulink is used to build the simulation model based on SMO. The simulation results show that the proposed control method is feasible and has good robustness.