Abstract
For the disadvantages of current electric vehicles regenerative braking, a new design of regenerative brake-by-wire system based on mechanical-electron-magnetism integration is proposed. The new system has electromagnetic braking mode and hybrid braking mode, the former uses electromagnetic braking and the latter combines electromagnetic braking with friction braking. In the hybrid braking mode, the new system can realize friction braking without extra actuator energy. To research the braking characteristics and braking principle of the regenerative brake-by-wire system, the vehicle dynamic model is established. The braking performance and energy recovery efficiency of the system are studied under emergency braking condition. The results show the regenerative brake-by-wire system based on mechanical-electron-magnetism integration not only meets brake comfort under low braking strength and stability under high braking strength, and brake efficiency, but also has better braking response and robustness. With the feature of variable pedal ratio, it conforms to driver’s pedal feeling. The control parameters are reduced and the performance of control system is improved. The new braking system can maintain a high recovery efficiency in a wide range of brake strength and increase the driving range of electric vehicles effectively.
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