Patent ID: 9221449
Filing Date: 2015-12-29
Classification: B60T

Abstract:
1. An electric brake system for a vehicle, the electric brake system comprising: a reservoir configured to store oil, a master cylinder provided with two hydraulic circuits and adapted to generate hydraulic pressure using the oil stored in the reservoir, an input rod disposed to contact the master cylinder and configured to move forward according to foot force applied to a brake pedal, a pedal displacement sensor configured to sense a displacement of the brake pedal connected to the input rod; a pressure supply unit connected to the reservoir via a hydraulic channel to receive oil from the reservoir, and the pressure supply unit configured to supply hydraulic pressure according to the sensed displacement; a hydraulic control unit configured to perform braking of the vehicle according to the hydraulic pressure supplied by the pressure supply unit; first and second switching valves linked between the pressure supply unit and the hydraulic control unit, and configured to control a transfer of hydraulic pressure to the hydraulic control unit by opening and closing operations of the switching valves; a first pressure sensor connected to the pressure supply unit, respectively, and configured to sense pressure on the pressure supply unit; a second pressure sensor connected to the master cylinder, and configured to sense pressure on the master cylinder; a return channel connected to the hydraulic channel, and configured to allow the hydraulic pressure which is supplied to the hydraulic control unit to be discharged therethrough and transferred to the pressure supply unit; a check valve installed in the hydraulic channel to prevent backflow of pressure from the pressure supply unit and configured to allow the oil to be suctioned into and stored in the pressure supply unit; a simulator connected to the master cylinder and configured to provide reaction force according to the foot force applied to the brake pedal; and an electronic control unit (ECU) connected to the pedal displacement sensor and the first and second pressure sensors, and configured to control wherein the pressure supply unit comprises, wherein the hydraulic control unit comprises, wherein the first and second switching valves are connected to the first and second circuits respectively, and the first switching valve is configured to control the hydraulic pressure supplied to the first circuit, and the second switching valve is configured to control the hydraulic pressure supplied to the second circuit, and wherein the first switching valve is a Normally Opened solenoid valve, and the second switching valve is a Normally Closed solenoid valve.