Patent ID: 7004122

Claim:
An engine valve actuation system, comprising: an intake valve moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid; a cam assembly configured to move the intake valve between the first position and the second position, wherein the cam assembly is mechanically connected to the intake valve; a fluid actuator configured to selectively prevent the intake valve from moving to the first position, and further configured to selectively hold the intake valve at a position between the first position and the second position; a source of fluid in fluid communication with the fluid actuator; a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; a fluid passageway connecting the directional control valve with the fluid actuator; an accumulator in fluid communication with the fluid passageway; and a restricted orifice disposed between the accumulator and the fluid passageway to restrict a flow of fluid between the accumulator and the fluid passageway.