Control of a hydraulic type variable valve timing mechanism utilizing torque acting on a camshaft to transfer oil between an advance chamber and a retard chamber to cause a variation in a rotational phase of the camshaft, is implemented by computing a manipulated variable at each one cycle of the torque, based on the deviation between a detection value of the rotational phase and a target value thereof.

 
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< Hydraulic actuation system for improved engine control

< System and method for adaptive control of variable valve lift tappet switching

> Approach for facilitating engine mode transitions

> Cam phaser having pre-loaded spring for biasing the rotor through only a portion of its range of authority

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