The Research Of Controlling Strategy On Regenerative Braking And Energy Recovery Of Electric Vehicle

Regenerative braking and energy recovery are the most important operating mode and the key energy-saving technologies in Electric Vehicles. Regenerative braking plays an important role in solving the weak point in driving range of electric vehicles and the low energy density of batteries, which are the critical factors in restricting the development of EV. Under the background of the project converting a conventional fuel vehicle to an EV, the following work in the technologies of regenerative braking and energy recovery has carried on in this paper.(1) A regenerative braking controlling strategy which took braking efficiency and energy recovery into consideration designed in this paper. Then, the working area of mechanical braking, mechanical and electric hybrid braking and electric braking were divided.At the same time, their mathematic modules about braking force distribution were established.(2) The Multi-objective Optimization Problem (MOP) in mechanical and electric hybrid braking area was optimized through the algorithem of Multiple Objective Particle Swarm Optimization (MOPSO), the braking force distribution scheme according to the driver’s braking intention was selected form the non-dominated solutions by the method of Technical for Order Preference by Similarity to an Ideal Solution (TOPSIS). Finally, the surface of braking force distribution in the whole mechanical and electric hybrid braking area of Electric Vehicle (EV) was obtained under the situation of invariable speed.(3) The secondary development of the braking force distribution module in ADVISOR2002Simulation Software was made and the simulation module of regenerative braking controlling strategy was established. The UDDS circulation road condition in American was chosed to make the offline simulation test. By the contrast analysis of the simulation results, the braking force distribution strategy which took the braking efficiency and energy recovery into consideration not only satisfied the restricted conditions of regenerative braking, but also made a greater degree of ascention in the aspect of both braking efficiency and energy recovery.