Intelligent optimization of EV comfort based on a cooperative braking system

Abstract

To address the comfort of an electric vehicle, a coupling mechanism between mechanical friction braking and electric regenerative braking was studied. A cooperative braking system model was established, and comprehensive simulations and system optimizations were carried out. The performance of the cooperative braking system was analyzed. The distribution of the braking force was optimized by an intelligent method, and the distribution of a braking force logic diagram based on comfort was proposed. Using an intelligent algorithm, the braking force was distributed between the two braking systems and between the driving and driven axles. The experiment based on comfort was carried out. The results show that comfort after optimization is improved by 76.29% compared with that before optimization by comparing RMS value in the time domain. The reason is that the braking force distribution strategy based on the optimization takes into account the driver’s braking demand, the maximum braking torque of the motor, and the requirements of vehicle comfort, and makes full use of the braking torque of the motor. The error between simulation results and experimental results is 5.13%, which indicates that the braking force’s distribution strategy is feasible.

Critical review on optimal regenerative braking control system architecture, calibration parameters and development challenges for EVs

“…To control and estimate the regenerative braking force, various brake control strategies (fuzzy, neural network, model predictive, sliding mode control, etc) are used, which are used to improve the performance of the regenerative braking controller 51,52 . Also, these control strategies are used to optimize the braking force distributions between regenerative braking and hydraulic braking system in the vehicle, also which depends upon the various sensor inputs (BPP, speed, SOC) from the driver 53 . For example, in the case of hard brake, the hydraulic brakes will also function simultaneously with the regenerative braking.…”

Hierarchical coordinated control strategy for regenerative braking energy recuperation with an electrobooster

“…1 Because EVs utilize renewable energy and have high energy efficiency, produce zero emissions and make little noise, they became the primary focal point of the automotive industry and research institutions. 2,3 However, the short range of EVs is a vital factor that restricts their popularization and development. Increasing battery capacity is a solution for increasing the range of EVs, though associated risks would increase.…”