Electric brake system

An electric brake system comprising:

• a hydraulic pressure supply device configured to generate hydraulic pressure using a piston that is activated by means of an electrical signal output corresponding to a displacement of a brake pedal, and including a first pressure chamber provided at one side of the piston, which is movably accommodated inside a cylinder block, and connected to one or more wheel cylinders, and a second pressure chamber provided at the other side of the piston and connected to one or more wheel cylinders;
• a first hydraulic circuit configured to include a first hydraulic flow path connecting the first pressure chamber to the one or more of wheel cylinders;
• a second hydraulic circuit configured to include a second hydraulic flow path connecting the second pressure chamber to the one or more of wheel cylinders;
• a first dump valve installed at a first dump flow path branching from the first hydraulic flow path and connecting a reservoir for storing oil therein to the first pressure chamber;
• a second dump valve installed at a second dump flow path branching from the second hydraulic flow path and connecting the reservoir to the second pressure chamber;
• a plurality of inlet valves configured to independently control an opening and closing of each of the first and second hydraulic flow paths;
• an electronic control unit (ECU) configured to control an operation of a motor and an opening and closing of each of the valves, and execute a dump mode that discharges hydraulic pressure of a single wheel cylinder among the one or more wheel cylinders;
• a balance valve configured to control an opening and closing of a balance flow path connecting the first hydraulic circuit to the second hydraulic circuit;
• a master cylinder for generating hydraulic pressure by a pedal effort of the brake pedal;
• and
• a backup flow path capable of directly supplying oil discharged from the master cylinder to the wheel cylinders when the hydraulic pressure supply device operates abnormally,
• wherein the backup flow path is connected to the balance flow path.

An electric brake system comprising:

• a hydraulic pressure supply device configured to generate hydraulic pressure using a piston that is activated by means of an electrical signal output corresponding to a displacement of a brake pedal, and including a first pressure chamber provided at one side of the piston, which is movably accommodated inside a cylinder block, and connected to one or more wheel cylinders, and a second pressure chamber provided at the other side of the piston and connected to one or more wheel cylinders;
• a first hydraulic circuit configured to include a first hydraulic flow path connecting the first pressure chamber to the one or more of wheel cylinders;
• a second hydraulic circuit configured to include a second hydraulic flow path connecting the second pressure chamber to the one or more of wheel cylinders;
• a first dump valve installed at a first dump flow path branching from the first hydraulic flow path and connecting a reservoir for storing oil therein to the first pressure chamber;
• a second dump valve installed at a second dump flow path branching from the second hydraulic flow path and connecting the reservoir to the second pressure chamber;
• a plurality of inlet valves configured to independently control an opening and closing of each of the first and second hydraulic flow paths;
• an electronic control unit (ECU) configured to control an operation of a motor and an opening and closing of each of the valves, and execute a dump mode that discharges hydraulic pressure of a single wheel cylinder among the one or more wheel cylinders;
• a balance valve configured to control an opening and closing of a balance flow path connecting the first hydraulic circuit to the second hydraulic circuit;
• and
• a master cylinder for generating hydraulic pressure by a pedal effort of the brake pedal and include two chambers,
• wherein the electronic control unit (ECU) executes a backup mode that directly supplies oil discharged from the master cylinder to the wheel cylinders when the hydraulic pressure supply device operates abnormally, and
• in the backup mode, one of the chamber of the master cylinder supplies oil to the first hydraulic circuit, and the other chamber of the master cylinder supplies oil to the second hydraulic circuit.