The Study Of Braking Performance Stability And Energy Efficient Recovery For Complex Regenerative Braking System

The motor in pure electric vehicles can work in the state of power generation and recover part of kinetic energy during braking. The pure electric vehicle has a brake energy recovery system consisting of motor/generator–battery, but there is a problem of low efficiency in energy recovery and release. However, the brake energy recovery system consisting of pump/motor-accumulator has high efficiency in energy recovery and release. So, the hydraulic and electric regenerative braking system were compounded together to recover braking energy, in order to retrieve a simple electric regenerative braking system weaknesses.This paper analyzed the various hydraulic regenerative drive systems, and then the rear type parallel drive system was determined for vehicle driver program based on the actual structural parameters of electric bus. The hydraulic system structure and components parameters were designed and hydraulic regenerative braking system works were analyzed for simulation analysis.The control methods for electro-hydraulic hybrid brake energy recovery system were based on the analysis of typical regenerative braking strategy. Brake force distribution has used parallel distribution strategy. The hydraulic and electric regenerative braking systems were working together when the vehicle recovered braking energy. When the car was started and accelerated, the hydraulic system beginning to release stored energy.ADAMS and AMESim software were used to build electric bus in the virtual prototype model and electro-hydraulic hybrid brake energy recovery system. Accordance with the relevant national standards, the models were carried on the power performance and urban cycle condition simulation in maximizing braking energy recovery and achieving the best braking performance, under the premise in order to improve vehicle dynamic performance and extend vehicle driving range. This paper finally made an analysis for hydraulic regenerative braking system efficiency factor. Simulation results show that the use of electro-hydraulic hybrid regenerative braking system significantly improve the electric vehicle acceleration and climbing performance, and extend the driving range of electric vehicle.