The Research On Development Of Controller For EV AC Motor And EV

The EV uses the Electric energy as the power and has the advantage of no emission. The application of EV will have a good prospect in the future.The controlling technology of driving motor is core of EV power system. It is one of the new technologies by using direct torque controlling method to control the AC motor in which is used in the EV.AC motor driving system is taken as the research object. The direct torque controlling method is applied in the EV AC motor driving system. The AC motor controller and EV controller are integrated into one in order to reduce the cost and improve the reliability.The character of all of the EV AC motor driving system is analyzed and the direct torque controlling method is compared with others according to the EV requirements. The current and future development of AC motor controlling technology and the theory construction and algorithm by using the space voltage vector method are discussed.The working theory of the AC motor are analyzed and set up the model of AC motor with controlling system. The model of AC motor direct torque controlling according to the foundation of previous analysis are realized. Introduce the critical parameter of magnetic linkage controlling and its realization method. The model to observe magnetic linkage and torque are used in order to obtain the perfect closed loop controlling effect. At last The AC motor direct torque controlling model are set up and the simulation are done and the expected result are reached. The vehicle model is set up according to the vehicle force formual. At last simiulation of two models are finished.The CAN bus in the EV and the protocol of CAN communication are designed. The American TI company's DSP TMS320LF2407 is selected as the controller. The whole circuit can be divided into two parts. One part is the core circuit which uses the TMS320LF2407. The other one use the IMP to drive the high voltage section. The whole circuit can complete sampling the position of shift,sampling the position of the pedal,output controlling variables and communication part and so on.The recycling energy strategy is introduced. The importance of recycling energy is discussed especially in the city situation. It can decrease the lose of mechanical braking system and use the energy again through recycling the energy in the braking process. The character of the recycling is analyzed and the plan of recycling is designed. It includes that the motor braking and mechanical braking are rationally allocated. At last the recycling system is optimized by using the fuzzy controlling method.The embed systemμC/OS-II is introduced; the transplant in the DSP2407 is finished. After the previous work is finished, all the task design is finished. At the end, the software testing in the hardware in loop method is finished.