Apparatus and method for performing rear-wheel regenerative braking control of ESC integrated regenerative braking system

An apparatus for controlling a rear-wheel regenerative braking of an electronic stability control (ESC) integrated regenerative braking system of a vehicle, comprising:

• a pedal cylinder unit connected to a reserve unit storing oil and configured to generate an oil pressure when a brake pedal is pressed;
• a motor configured to be driven by an electric signal generated in response to displacement of the brake pedal;
• a master cylinder unit connected to the pedal cylinder unit and configured to generate a braking oil pressure through a master piston that is moved forward or backward by the driving of the motor;
• a control unit configured to:
• in a state in which the vehicle is in a regenerative braking coordinated control mode, perform front-wheel pressure control on the motor according to a pressure desired by a driver based on the brake pedal in a case where a rear-wheel regenerative braking force occurs;
• perform reverse pressure control on the motor as much as a variation in the rear-wheel regenerative braking force in a case where reduction of the rear-wheel regenerative braking force occurs;
• and
• perform drive pressure control on the motor in a case where the reduction of the rear-wheel regenerative braking force is completed;
• and
• a plurality of oil pressure relief valves provided on a plurality of oil pressure channels extending from the reserve unit to a plurality of wheel cylinders configured to brake a plurality of wheels, wherein the control unit is configured to control opening and closing of the plurality of oil pressure relief valves.