Electro-mechanical brake device and method of controlling the same

A method of controlling an electro-mechanical brake device, the method comprising:

• a central electronic control unit awaking operation of switching a central electronic control unit to an awake mode based on a wake-up signal received from a wake-up sensor;
• a wheel electronic control unit awaking operation of transmitting a signal using in-vehicle communication such that a wheel electronic control unit is switched from a sleep mode to the awake mode;
• a current control operation of, in response to detecting a braking input of a driver, supplying a current to a motor mounted on an electro-mechanical brake using current control to generate a braking force;
• a comparing operation of comparing a parking braking force to a magnitude of a required braking force based on the braking input;
• a braking force generating operation of, in response to determining that the parking braking force is determined to be less than the required braking force, controlling the wheel electronic control unit to release the parking braking force and generate the required braking force, and in response to determining the parking braking force is greater than or equal to the required braking force, releasing the parking braking force and maintaining the braking force generated in a wheel;
• a position control operation of, in response to determining that the braking force reaches the required braking force or the braking force is maintained, switching the current control to a position control;
• and
• an initializing operation of not performing initializing the electro-mechanical brake at a time point at which the sleep mode is switched to the awake mode, but initializing the electro-mechanical brake at a time point at which, after ignition is turned on, a braking force release signal indicating that the driver starts to take a foot off a brake pedal is transmitted to start the vehicle in a stopped state and a decrease in stroke intensity of the driver's foot on the brake pedal is detected by a stroke sensor such that the required braking force generated by the braking input of the driver is decreased, wherein the initializing the electro-mechanical brake includes identifying a contact point between a brake pad and a disc in response to determining that a piston mounted on the electro-mechanical brake is retracted and adjusting a gap between the disc and the brake pad based on the contact point.