Research on control for regenerative braking of electric vehicle

The limitation of driving range is the key restriction for the development of EV (electric vehicle), and regenerative braking is an effective approach to extend the driving range of electric vehicle. To protect the battery from broken caused by large charging current during regenerative braking, the control strategy that makes the charging current as control object is proposed in this paper. To ensure the robustness of the closed-loop system under the presence of uncertainties, such as parameter perturbation and unknown model dynamics, and to minimize the effect of disturbance, such as the variation of the voltage of battery, state of the road, and the driving profile of vehicle, the design of controllers for regenerative braking is transformed into the weighted mixed-sensitivity problem, and the H infinity robust controller for regenerative braking is designed. Finally, experimental researches on XJTUEV-1 under different driving modes are performed. The experimental results show that Hoo robust controller is prior to the traditional PI controller in both steady-state tracking error and response speed. Additionally the Hoo robust controller for regenerative braking can recover more energy than PI controller during the EV braking.