Electro-mechanical brake

An electro-mechanical brake comprising a piston configured to push a brake pad towards a wheel disc by driving a motor, the electro-mechanical brake comprising:

• a position detection unit detecting a position of the piston;
• a current detection unit detecting a value of current flowing through the motor;
• a motor controller controlling the motor to move the piston toward the wheel disc for a preset time when a vehicle is stopped;
• and
• a contact point calculation unit calculating a contact point that is a position of the piston when the brake pad starts to contact with the wheel disc,
• wherein the contact point calculation unit calculates a first position that is a position of the piston when a first current value is detected using the current detection unit, and a second position, spaced apart from the first position by a preset distance in a direction away from the wheel disc, and the contact point calculation unit determines the second position as the contact point,
• wherein the first current value is a current value on a section in which the current value detected using the current detection unit is linearly changed within a predetermined error range with respect to the position of the piston, and
• the preset distance is set based on a specification of the electro-mechanical brake, and is calculated based on the first current value and the position of the piston when the first current value is detected using the current detection unit,
• wherein the current value is non-linearly increased in a non-linear section after the contact point, and when an operating distance is further increased past the non-linear section, the current value is linearly increased in a linear section, and
• wherein the first position is located in the linear section, and the second position is located in the non-linear section.