Control strategy of energy recovery of electric vehicles based on braking strength

A control strategy based on braking strength is proposed to improve energy recovery rate of electric vehicles based on traditional braking force distribution strategy. Apportionment of mechanical and electric braking forces is analyzed when brake strength is low. Control strategy under different braking strength is improved according to highest efficiency braking torque and ECE laws and applied conditions of this strategy are explained. A real electric vehicle model is built in AVL-CRUISE under NEDC and FTP75 road conditions. Simulation results show that the proposed strategy can obviously improve braking energy utilization rate and guarantee braking stability.