Abstract:

Two and fourwheel drive electric vehicle models were built based on the EHB system to realize regenerative braking. In accordance with “under the premise of meeting the regulatory requirements, braking energy recovery maximization” principle, the optimal braking force distribution, parallel system of power distribution and a fixed ratio of braking force distribution algorithm were carried out, to compare braking energy recovery of frontwheel drive and fourwheel drive electric vehicles,respectively. Simulation results show that frontwheel drive system for electric vehicles using the optimal power allocation algorithm recover more braking energy; fourwheel drive electric vehicle using a fixed ratio of braking force distribution algorithm has the highest energy recovery rate; fourwheel drive and frontwheel drive electric vehicle with maximum energy recovery braking force distribution strategy, energy recovery rate is almost the same, economy is not significant different. However, fourwheel drive electric vehicle braking force distribution method is a fixed ratio, which is closer to the ideal braking force distribution curve than the precursor, due to that it is more secure.

Key words: vehicle engineering, electric vehicle, regenerative braking, four-wheel drive, front wheel drive