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Pre-Curve Braking Planning of Battery Electric Vehicle based on Vehicle Infrastructure Cooperative System
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on October 05, 2020 by SAE International in United States
Braking energy recovery is an important method for Battery Electric Vehicle (BEV) to save energy and increase driving range. Vehicle braking system performs regenerative braking control based on driver operations. Different braking operations have a significant impact on energy recovery efficiency. This paper proposes a method for planning the braking process of a BEV based on Intelligent Vehicle Infrastructure Cooperative System (IVICS). By actively planning the braking process, the braking energy recovery efficiency is improved. Vehicles need to decelerate and brake before entering a curve. The IVICS is used to obtain information about the curve section in front of the vehicle's driving route. Then calculating the reference speed of the curve, and obtaining the vehicle's braking target in advance, so as to actively plan the vehicle braking process. First, this paper builds a vehicle dynamics model and analyzes the vehicle's dynamic characteristics when cornering to build a curve safe vehicle speed model. A safety factor is introduced to the safe speed model to calculate the reference speed in the curve, that is, the vehicle braking target. After that, the regenerative braking process is analyzed to study the relationship between the braking process elements and the braking energy recovery efficiency. With the goal of improving the braking energy recovery efficiency, and combining the vehicle's driving efficiency requirements, the planning and control strategies for the cornering braking process under different speeds and different deceleration requirements are determined. Simulation results show that actively planning the braking process of a BEV can significantly improve the braking energy recovery efficiency and increase the driving range.