Brake-Blending Control of EVs

Abstract With the aim of cooperative optimization of regeneration efficiency and ride comfort, the regenerative-braking energy-management strategy is investigated for electrified passenger cars. In this chapter the blending brake model, including a nonlinear electric powertrain model and a hydraulic brake system model, are developed in MATLAB/Simulink. The control effects and regeneration efficiencies of the control strategies in a typical deceleration process are studied and analyzed via simulation and vehicle testing. Moreover, since the regenerative braking provided by an electric powertrain is far different from conventional friction braking with respect to the system dynamics, the effects of the powertrain nonlinearities, i.e., the backlash and flexibility on vehicle drivability and brake-blending performance during regenerative decelerations are investigated. To further improve brake-blending control performance, a mode-switching-based active control algorithm with a hierarchical architecture is developed for the backlash and flexibility compensation. The proposed control algorithms are compared with the baseline one under the regeneration-braking process. The simulation results show that the vehicle drivability and blended-braking performance can be significantly enhanced by the developed control algorithm.

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