전후륜 독립구동 전기자동차의 제동력 분배 최적화

Abstract

To extend the driving range of electric vehicles, various studies to maximize the driving efficiency such as optimization of driving force distribution are performed. Because an electric vehicle can recover energy through regenerative braking, it can be optimized to minimize energy consumption. However, because braking is directly related to the safety, it is required to achieve stable braking by distributing torque to the front and rear wheels. The maximum torque of the motor may not satisfy the required braking force, so hydraulic braking force can be required. In this study, the regenerative braking force distribution is optimized within the range of securing the braking stability of the vehicle by considering ideal braking force distribution and ECE regulations for braking. Modeling and simulation of front and rear axle independently driven electric vehicles is carried out, and the driving force and braking force are optimized. It is designed to satisfy the required braking force by the regenerative braking of the motor and support of the mechanical braking when needed. Through the WLTP cycle simulation, it is confirmed that the SOC consumption is decreased compared with the braking force distribution based on the I-Curve.