The Design Of Motor Control System Based On FPGA For Four-wheel Drive Electric Car

The car industry is one of the most important symbol of modern industrial civilization, entering the 21st century, with the strengthening awareness of environmental protection and the expanding energy crisis, people have no choice but to reconsider the current status and future of the automobile industry. Electric cars have advantages including energy-saving, zero-exhausting and low noise etc, it is the real green traffic tools. BLDCM is the best choice in the driving system of electric cars. This thesis takes the electric control 4wd driving system as the main research object, using the FPGA as core controller to do the interrelated analysis and research.Firstly this thesis carry on research in the present situation and development trend of electric cars and its driving system control methods at home and abroad. Find out the control method of BLDCM and development of its controller.Secondly, this thesis analyze the technology of driving system of the electric cars and use the FPGA as the core controller according to the characteristics of driving control system and the request in improving the integration. As a digital device, FPGA usually use in controlling digital motor, with a certain degree of digital transformation of the system it could be used to control BLDCM. The FPGA adopt unique parallel computing circuit, could using to control multiple objects independently and its performance is not affected, avoiding the complex timing problems in design, improving the system integration and the anti-interference ability.Using Altera FPGA as core controller to design the driving control system in electric cars. The system includes controlling and driving parts. Controlling part is mainly composed of FPGA and A/D converting modules. Driving circuit includes power converting circuits and isolation circuit. Choose of PID control as the main algorithm for four wheels motor independent controlling, doing simulations under Quartus II environment.Finally, through the commissioning and experiment to realize the reliability of whole system, and the good performance in speed adjustment.