Research Of In-wheel Drive Control System In Electric Vehicle's Technology

With the increasingly serious environmental pollution and the oil crisis, the auto industry is facing severe challenges. To the sustainable development of the automobile industry, the world's major automobile companies are starting to research various new types of pollution-free environmentally friendly vehicles, In all development projects, the use of the electric motor-driven equipment for electric cars can truly achieve "zero pollution", it has become a vehicle of research and development focus. In a wide range of technical options of the electric vehicles, the Wheel-driven electric vehicles have become a new research direction. With its ideal control characteristics and extensive application, which has attracted academic and engineering's widespread concern, china in these fields, it is just a start. In this paper, electric vehicle electric-wheel Drive System as a research object, we focus on the research and analysis of the DSP control systems in two-wheel drive electric vehicles.Compared to the traditional fuel vehicles, Wheel-driven electric vehicles each driving wheel's torque can be controlled individually. According to the traditional electric vehicles and fuel vehicles' different technical characteristics, we build an electric car driving system, focus on the wheel motor selection, control methods, and rely on driver's driving feel, compare and choose the motor control strategies.In order to solve the electric car's curve driving process, the wheels moving about no equal to the distance. Based on the traditional electronic differential algorithm, this paper presents a relying on wheel speed to calculate the margin of electronic torque algorithm. In addition, based on fuzzy control method, we realize the vehicle slip ratio's control. Consequently it improves vehicle maneuverability, stability and security. According to the simulation results it demonstrated the system's good performance.In view of the above-driven system, by using DSP chip we design two-wheel motor drive control system, and through owned hardware and software design, Combining electronic differential algorithm and the slip rate control algorithm, it reasonably controls electric vehicles' two driving wheels, thus the electric vehicles achieve good dynamic and static operational characteristics.In addition, in order to achieve drive control system and battery management systems, human-machine interface display systems and other equipments for data communications, we design a CAN bus communication agencies, and tie-in hardware and software design.