Electronic brake system and operation method

An electronic brake system, comprising:

• a reservoir configured to store a pressure medium;
• an integrated master cylinder including a master chamber and a simulation chamber;
• a reservoir flow path configured to communicate the integrated master cylinder with the reservoir;
• a hydraulic pressure supply device including a first pressure chamber and a second pressure chamber partitioned by a hydraulic piston moving in a cylinder block by an electrical signal output in response to a displacement of a brake pedal, the first pressure chamber positioned at a forward side of the hydraulic piston and the second pressure chamber positioned at a backward side of the hydraulic piston;
• a first hydraulic circuit and a second hydraulic circuit configured to control hydraulic pressure of wheel cylinders;
• and
• a hydraulic control unit configured to control a flow of the hydraulic pressure provided from the hydraulic pressure supply device to the first and second hydraulic circuits;
• wherein the hydraulic control unit comprises:
• a first hydraulic flow path connecting the first pressure chamber and one of the first and second hydraulic circuits and configured to provide the hydraulic pressure of the first pressure chamber to one of the first and second hydraulic circuits;
• a second hydraulic flow path branched from the first hydraulic flow path to connect to the other one of the first and second hydraulic circuits and configured to provide the hydraulic pressure of the first hydraulic flow path to the other one of the first and second hydraulic circuits;
• a third hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the second hydraulic flow path to connect the second pressure chamber and configured to provide the hydraulic pressure of the second pressure chamber to the first hydraulic flow path;
• and
• a fourth hydraulic flow path branched from the first hydraulic flow path on upstream side of a branch point of the third hydraulic flow path to connect the third hydraulic flow path and configured to flow selectively the pressure medium between the first pressure chamber and the second pressure chamber.