Study On Regenerative Braking For Electric-Wheel Vehicle

The auto companies, universities, scholars, and even the governments around the world have paid attention to the electric car and the new technologies of it, because that the electric car has the advantages as follows:high efficiency, zero emissions, low noise and simple structure.The electric cars are outstanding at the aspects of energy conservation and environmental protection, not only because their source of power is purely environment friendly, but also because regenerative braking technique can be applied to them. With this method, the ratio of energy utilization of electric cars will be effectively increased.In order to ensure the safety of the braking condition and recycle the braking energy as far as possible, to formulate the regenerative braking control strategy is required.The first part of this text introduces the regenerative braking system in such details:structures, the significance, principles and operational processes. The design requirements of designing a regenerative braking system are put forward as follow: the braking stability, riding comfort and the ratio of energy recovery of this system.In the second part, the factors of influencing braking force balance performance of a car are introduced. In addition, the qualities of three kinds of common regenerative braking strategies are discussed in this part. And then a new regenerative braking force distribution, which is applied to electric cars with in-wheel motor, has been put forward.In the third part, with the aid of the powerful simulation ability of the ADVISOR, which has code open for secondary development, new models were established based on its original modules like vehicle, wheel, motor and the controller modules.In the last part of this paper, a braking strategy has been simulated respectively in a typical driving cycle condition and a typical breaking condition. The strategy also has been evaluated in the last part of the paper.