Apparatus and method for controlling ESC-integrated regenerative braking system

An apparatus for controlling an ESC-integrated regenerative braking system, comprising:

• a pedal cylinder unit connected to a reservoir unit storing oil therein, the pedal cylinder unit configured to generate a hydraulic pressure by pressing a brake pedal;
• a motor configured to be driven by an electrical signal output in response to a displacement of the brake pedal;
• a master cylinder unit connected to the pedal cylinder unit and configured to form a hydraulic pressure for braking through a master piston moving forward and backward by the driving of the motor;
• a control unit configured to detect a leakage of oil while a vehicle is traveling or stops, based on a change in pressure in a hydraulic passage, during at least one of a plurality of controls of the master cylinder unit;
• and
• a hydraulic control valve provided in the hydraulic passage for connecting the reservoir unit to a wheel cylinder configured to brake each wheel, the hydraulic control valve being opened and closed under control of the control unit,
• wherein, if a difference in pressure defined as required pressure−formed pressure is less than a specified reference pressure difference, the control unit outputs a suspect signal indicating there is a possibility of the leakage of oil, accumulates a number of outputs of the suspect signal, and when the accumulated number of outputs of the suspect signal is equal to or more than a predetermined reference number, determines that the leakage of oil occurs.