Electronic brake system and control method thereof

An electronic brake system comprising:

• a master cylinder connected to a reservoir storing oil, the master cylinder including a master chamber and a master piston provided at the master chamber, and configured to discharge the oil according to pedal effort of a brake pedal;
• a sensor configured to measure a displacement of the brake pedal;
• a pedal simulator configured to provide a reaction force according to pedal effort of the brake pedal and including a simulator chamber connected to the master cylinder to accommodate the oil;
• a hydraulic actuator provided between the master cylinder and a wheel cylinder and configured to control a hydraulic pressure flow delivered to the wheel cylinder;
• a first hydraulic pressure supply device operated by an electrical signal which is output by corresponding to the displacement of the brake pedal, and configured to supply a hydraulic pressure to the hydraulic actuator;
• and
• a second hydraulic pressure supply device provided between the reservoir and the master cylinder, wherein a vibration pedal feel is provided to the brake pedal by hydraulic pressure pulsation generated by the second hydraulic pressure supply device provided between the reservoir and the master cylinder,
• wherein the master cylinder has first and second chambers, and
• wherein a first flow path, comprising an inspection valve and a check valve connected in parallel and connected between the first chamber of the master cylinder and the reservoir, and a second flow path, comprising the second hydraulic pressure supply device connected between the second chamber of the master cylinder and the reservoir, are separated from each other.