Abstract:The Electric-control Hydraulic Brake (EHB) system of automobile is a brake control mode which combines the technology of wire control within hydraulic control unit. The dynamic performance of EHB directly affects the braking effect of the whole automobile. In order to improve the control efficiency of EHB system, in this paper, the working characteristics of EHB system are analyzed firstly, and then the simulation model of EHB system is established by using AMESim software. Based on the proposed model, the control strategy of EHB system is designed with PWM and logic threshold method. Finally, the pressure following and ABS braking effect are tested. The test results show that the designed control method can achieve the effective braking of the vehicle, which has a good effect on the response characteristics of the target pressure and greatly improves the braking performance of the vehicle.