Key Technologies and Research Progress of Brake-by-wire System for Intelligent Electric Vehicles

Intelligent electric vehicles require the brake system to realize functions such as active braking and braking energy recovery, and traditional brake systems cannot meet the above requirements. The brake-by-wire system has the advantages of compact structure, rapid response, precise control, and strong compatibility. It is an ideal actuator for autonomous driving and has become a current research hotspot. To systematically and timely grasp the development trend of this field, the key technologies and research progress of the brake-by-wire system for intelligent electric vehicles are reviewed. The types and characteristics of the brake-by-wire system are introduced, and the development trend and research focus of the structural scheme of the brake-by-wire system are clarified. Then the typical products and characteristics of the brake-by-wire system are summarized, and the overall control architecture of the brake-by-wire system for an intelligent connected electric vehicle is proposed. On this basis, the key technologies such as testing and modeling of the brake-by-wire system, power cylinder pressure control, wheel cylinder pressure control, wheel cylinder pressure estimation, solenoid valve control, clamping force control, pedal feel simulation control, sensor fault diagnosis, and personalized control are sorted out. The vehicle's longitudinal motion control methods, such as anti-lock braking, adaptive cruise, and automatic emergency braking based on the brake-by-wire system, are summarized. Finally, the problems faced by the research on the brake-by-wire system for intelligent electric vehicles and the future development trend are analyzed and prospected. © 2024 Chinese Mechanical Engineering Society. All rights reserved.