Patent ID: 6679207
Filing Date: 2004-01-20
Classification: F01L,F02B,Y02T

Abstract:
A valve actuation system, comprising:an engine valve moveable between a first position where the engine valve prevents a flow of fluid relative to the engine valve and a second position where the engine valve allows a flow of fluid relative to the engine valve; a first cam rotatable to move the engine valve from the first position to the second position during a first lift period; a second cam rotatable to affect movement of the engine valve between the first position and the second position during a second lift period; and a phase shifting device operatively connected to the second cam and adapted to adjust the rotational phase of the second cam relative to the first cam, the phase shifting device adapted to adjust the phase of the second cam relative to the first cam between a first phase where the second lift period overlaps with the first lift period such that the engine valve returns to the first position at the end of the first lift period and a second phase where the second lift period is delayed with respect to the first lift period such that the engine valve returns to the first position at the end of the second lift period.