A study on the control strategy for maximum energy recovery by regenerative braking in electric vehicles

The regenerative braking control strategy for a light hybrid electric vehicle (LHEV) is studied in this paper. Specifically, a braking control strategy for maximum energy recovery is proposed first with an objective of highest overall efficiency, and the charging powers are optimized by using sequential quadratic programming technique to obtain optimized torque working points of ISG motor. Then a simulation model for LHEV is built, a tracking control is performed over optimized torque of ISG motor with fuzzy control scheme, and a simulation is conducted on three different braking forces respectively with NEDC cycle to obtain energy recovery ratios in regenerative braking. Finally a real vehicle test corresponding to simulation conditions is carried out to verify the effectiveness of control strategy proposed.