Continuous variable valve duration apparatus and control method for the same

A continuous variable valve duration apparatus comprising:

• a camshaft;
• a front cam unit and a rear cam unit, each of which is formed with cams, wherein the camshaft is inserted through the front and rear cam units and a phase relative to the camshaft is varied;
• a front inner wheel and a rear inner wheel configured to transmit a rotation of the camshaft to the front cam unit and the rear cam unit, respectively;
• a front guide bracket and a rear guide bracket;
• a front wheel housing and a rear wheel housing to which the front inner wheel and the rear inner wheel are rotatably inserted, respectively, wherein a front guide thread and a rear guide thread are formed in the front wheel housing and the rear wheel housing, respectively, and the front wheel housing and the rear wheel housing are configured to movably insert into the front guide bracket and the rear guide bracket, respectively;
• a front control shaft on which a front control worm for rotating the front guide thread is formed;
• a rear control shaft on which a rear control worm for rotating the rear guide thread is formed;
• a phase controller configured to selectively change a relative phase of the front control shaft and the rear control shaft;
• a main driving unit configured to rotate the rear control shaft;
• vibration sensors configured to measure a vibration of each cylinder, among a plurality of cylinders, corresponding to the front cam unit and the rear cam unit and configured to output corresponding signals;
• and
• wherein a controller is configured to control an operation of the main driving unit and the phase controller based on the corresponding signals of the respective vibration sensors.