Investigation Of Regenerative Braking System Property On Electric Vehicle

Electric vehicles run zero exhaust emission,it is beneficial to environmental protection.With the technological development,electric cars can gradually become the surrogate products of fuel cars.Regenerative braking system is particular to electric cars,it is an effective method to increase driving range of electric vehicles.It can slow down or brake the vehicle during vehicle braking performance.Under ensuring the braking conditions,it can through the drive motor convert kinetic energy into electrical energy ,the electrical energy can be stored in the battery,meanwhile it generat all or part of the vehicle braking force required.The paper analyse the mechanics in the process of regenerative braking,study on the principle and influence factor of regenerative braking system ,relative analysis the merit and demerit of differrent types of battery and motors,on this basis,regard ADVISOR as the simulation platform,the paper build the simulation models of battery,motor and DC/DC in the ADVISOR.Meanwhile,regenerative braking system in PHEV and PHEV in ADVISOR are the object of study, simulation models of vehicle,drive cycle,fuel converter and power bus were built.Regenerative braking control strategy formulate proportional relation of regenerative braking and mechanical braking,how to distribution regenerative braking and mechanical braking has become the key problem of raising regenerative braking energy.This paper research on the distribution of braking force in the braking process and put forward recovering force energy as much as possible by way of raising proportional relation of regenerative braking.Two typical control strategy and particular control strategy in ADVISOR were analyzed and we put forward a new control strategy.Used simulation models and new control strategy,the dynamic performance and fuel economy on the CYC_UDDS and NEDC driving cycle are simulated by ADVISOR software,we get simulation results of fuel consumption,emission,dynamic, charging efficiency and discharging efficiency of brttery, gearbox efficiency and fuel converter efficiency.From the simulation results,the new control strategy is proved to be more effective and practical compared with the original control strategy, it gives some guidance for the later researchs.