Redundant Brake Boost Control Strategy of Integrated Electro-hydraulic Braking System

The traditional braking system has been unable to meet the redundant safety requirements of the intelligent vehicle for the braking system. At the same time, under the change of electrification and intelligence, the braking system needs to have the functions of braking boost, braking energy recovery, braking redundancy and so on. Therefore, it is necessary to study the redundant braking boost control of the integrated electro-hydraulic braking system. Based on the brake boost failure problem of the integrated electro-hydraulic brake system, this paper proposes a redundant brake boost control strategy based on the Integrated Brake Control system plus the Redundant Brake Unit configuration, which mainly includes fault diagnosis of Integrated Brake Control brake boost failure, recognition of driver braking intention based on pedal force, pressure control strategy of Integrated Brake Control brake boost and pressure control strategy of Redundant Brake Unit brake boost. The designed control strategy of redundant brake boost is tested and verified on the real vehicle platform. The results show that the designed control strategy can effectively judge the brake boost fault of Integrated Brake Control and accurately identify the driver’s braking intention after the Integrated Brake Control is in brake boost failure. After receiving the expected braking pressure of the driver, the braking pressure is built by Redundant Brake Unit, which can accurately respond to the driver’s braking request and improve the redundant safety of the braking system.