| Energy shortage and environmental pollution is a serious problem in the current social, electric vehicle with the advantages of energy conservation and environmental protection outstanding has become the important way to solve this problem, more and more get the favor of the market. Permanent magnet brushless dc motor with its simple structure, reliable operation, good start torque and speed, etc, has been used in electric vehicles increasingly. Based on the electric vehicle permanent magnet brushless dc motor control system as the research object, in view of the present characteristics and performance requirements for electric vehicle, as well as electric vehicle permanent magnet brushless dc motor control system existence question, a kind of electric vehicle permanent magnet brushless dc motor control system solutions is given.First, the paper introduced the electric vehicle permanent magnet brushless dc motor structure and working principle, and the rotor position signal detection technology and the selection of sensor, then its mathematical model was deduced by motor basic theory formula, At last, combined with software of Matlab/Simulink, established the electric vehicle simulation model of permanent magnet brushless dc motor control system and simulation analysis, to provides reference and basis for better realize the control system hardware design and control strategy development.In this paper, the designed control system used a microcontroller combined with special integrated circuits. Microcontroller is mainly responsible for receiving and processing of signal, to realize system control strategy, information display and man-machine conversation; special integrated circuits mainly through receive control signal from Microcontroller to control the motor in real time. The combination of microcontroller and special integrated circuits, effectively reduce the burden of the microcontroller, simplifies the structure of the control system, improve the flexibility and reliability of the system. Adopts modular design for hardware of the control system, in order to reduce the use of DC/DC converter on electric vehicle, special designed power supply module, reduces the production cost of electric vehicles.In order to realize the control of the electric vehicle and motor combination, mechanical analysis for electric vehicle, established the control system model based on electric vehicle, to research the system control strategy, and puts forward the control strategy of the main program flow chart. Control system based on the speed deviation of incremental PI control mode, vehicle real-time speed as feedback signal input to microcontroller; improve the control performance of electric vehicles greatly. At the same time, through to battery management for electric vehicle, further to ensure the security and reliability of the electric vehicle.Finally introduced the electric vehicles PMBLDCM control system detection technology and achieved good results, and the related test method and principle of control system are analyzed and illustrated. The control system has simple structure, make full use of resources, high cost performance, and control for vehicle and battery management functions, effectively improve the performance of electric vehicles, it has certain commercial application prospect in the field of electric vehicles. |
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