Coordinated Control of Hybrid Braking Based on Integrated-Electro-hydraulic Brake System

Abstract:

In the transitional conditions of hybrid braking of electric vehicle, for the impact caused by the poor cooperation between the hydraulic braking force and the motor braking force, a coordination strategy of double closedloop feedback and motor force correction was proposed. The double closed-loop feedback strategy relies on the motor force to compensate for the tracking error of hydraulic pressure of the hydraulic brake system, the purpose of the motor force correction strategy is to guarantee the motor to have the compensation capability under all transient conditions. The simulation and hardware in-loop test are carried out based on the integrated-electro-hydraulic brake system (I-EHB). The test results show that the proposed strategy can significantly reduce the impact degree in the braking force switching conditions and improve the vehicle braking comfort.

Key words:hybrid braking; integrated-electro-hydraulic brake system; transitional condition; impact degree