Patent ID: 7827945

Claim:
A camshaft operating unit including a friction torque variation simulation unit ( 10 a - 10 f ) for a camshaft arrangement ( 11 a - 11 f ) with at least one adjustable camshaft ( 12 a - 12 f , 13 a - 13 f ) and at least one camshaft adjusting unit ( 14 a - 14 f , 15 a - 15 f ), the friction torque variation simulation unit ( 10 a - 10 f ) being provided to simulate a friction torque serving as compensation for friction differences between camshafts ( 12 a - 12 f , 13 a - 13 f ) or camshaft drives, the friction torque variation simulation unit ( 10 a - 10 f ) being designed such that torques which are effective for at least two adjusting inputs ( 16 a - 16 f , 17 a - 17 f ) of at least two camshafts ( 12 a - 12 f , 13 a - 13 f ) are on average at least substantially equal.