Design of Regenerative Braking Strategy for Hybrid Electric Vehicle Based on Sensitivity Ratio

Based on the braking system of hybrid electric vehicles (HEVs), a method based on sensitivity ratio decision- making is proposed to coordinate the multi-objective requirements of stability and economy in vehicle regenerative braking. Firstly, the grid method is used to calculate the fitness of the braking force distribution coefficient α of each front and rear wheel under each braking intensity z, and the Pareto solution set is obtained through non-dominated sorting. Then the decision method of nonlinear variable weight sensitivity ratio is adopted offline to obtain the best coordination α. Next the one-dimensional mapping table (1-D table) of z and α is built, and embedded into the braking energy strategy to achieve the coordination of stability and economy. Finally, the simulation is carried out in ADVISOR simulation software, and the results show that the stability of this strategy is better than the traditional ADVISOR strategy, and the brake recovery rate is increased by 43.55%.