Engine valve actuation system

摘要

An engine valve actuation system is provided. An intake valve (32) is moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid. A cam assembly (52) is connected to move the intake valve (32) between the first position and the second position. A fluid actuator (70) is configured to selectively prevent the intake valve (32) from moving to the first position. A source of fluid (84) is in fluid communication with the fluid actuator (70). A directional control valve (88) is configured to control a flow of fluid between the source of fluid (84) and the fluid actuator (70). A control valve (82) is disposed between the source of fluid (84) and the directional control valve (88). The control valve (82) is moveable between a first position to prevent a flow of fluid between the source of fluid (84) and the directional control valve (88) and a second position to allow the flow of fluid from the source of fluid (84) to the directional control valve (88).