Vehicle Stability Control with Regenerative Braking and Electronic Brake Force Distribution for a Four-Wheel Drive Hybrid Electric Vehicle

Abstract

Vehicle stability control for a four-wheel drive (4WD) hybrid electric vehicle is investigated using the regenerative braking of the rear motor and electrohydraulic brake (EHB). A fuzzy-rule-based control algorithm is proposed, which generates the direct yaw moment to compensate for the errors of the sideslip angle and yaw rate. Performance of the stability control logic is evaluated for J-turn and single-lane change. It is found from the simulation results that the regenerative braking of the rear motor is able to provide improved stability compared with the vehicle performance without any control. It is found that better performance can be achieved by applying the regenerative braking plus the EHB control. In addition, the optimal distribution ratio of the EHB force is presented to minimize the EHB power consumption. The simulation results show that the required torque level by the optimal EHB distribution ratio control is much lower than that of the fixed distribution ratio, while providing almost the same control performance. It is expected that the vehicle stability control algorithm suggested in this study is able to offer improved vehicle stability.