Valve control system for internal combustion engine has rotation phase controller with coupling with hold and disengaged states, generator of holding torque in holding direction

摘要

The system has a rotor rotated by an engine crankshaft (9), a camshaft (2) rotated according to the rotation of the rotor to open and close an inlet valve (1) and an outlet valve (4)and a rotation phase controller for variably controlling a rotation phase of the camshaft relative to the rotor, whereby the rotation phase controller is arranged between the rotor and the camshaft. The rotation phase controller has a coupling that can be optionally set into a hold state, in which relative rotation between the rotor and camshaft is prevented in at least one direction, or a disengaged state in which the relative rotation can take place, and a generator of holding torque in the direction in which relative motion is prevented in the hold state.