Patent ID: 7870841

Claim:
A valve actuation system for an internal combustion engine comprising: a first gas exchange valve, a first cam acting on the first valve by way of a rocker pivotable about a fixed pivot axis, a second gas exchange valve, a second cam having at least two lobes and acting on the second valve by way of a second rocker pivotable about an eccentric, the second of the two lobes of the second cam being arranged to open the second valve at a time that the first valve is opened by the first cam, a selectively operable latching mechanism for latching the eccentric in a fixed position in which each of the cam lobes of the second cam causes the second valve to open, and means responsive to the position of the first rocker for causing or permitting the eccentric to move during the opening of the first valve in a sense to oppose the lifting of the second valve by the second lobe of the second cam when the latching mechanism is released.