Apparatus and method for controlling headrest of vehicle seat

An apparatus for controlling a headrest for a vehicle seat, the apparatus comprising:

• a headrest disposed at an upper side of the vehicle seat and that moves to an upper end or a lower end;
• a slider that moves the seat forward or rearward;
• a recliner that rotates the seat forward or rearward;
• a drive unit that operates the headrest, the slider and the recliner, the drive unit including a first drive unit connected to the headrest, a second drive unit connected to the slider, and a third drive unit connected to the recliner;
• a sensor unit connected to the first, the second, and the third drive units of the drive unit and that detects a position of the headrest, a position of the slider, and a rotation angle of the recliner;
• an input unit that receives an inputted operation instruction to operate the slider and the recliner from a user;
• and
• a control unit that controls the first, the second, and the third drive units of the drive unit based on the inputted operation instruction and operates the headrest upward or downward by controlling the first drive unit in accordance with the detected position of the slider and the detected rotation angle of the recliner,
• wherein the control unit prevents the headrest from contacting a sun visor at a front side of the vehicle seat by not operating the headrest downward when the detected rotation angle of the recliner is less than 25° from a rearmost side and adjusting a height of the headrest downward to a lowermost end when the detected rotation angle is 25° or more from the rearmost side.