| 摘要 |
A valve actuation device for an internal combustion engine having at least one combustion cylinder, a piston positioned within said cylinder for reciprocal motion therein; a pressurized hydraulic fluid gallery in a closed lubrication system; at least one valve in gas exchange communication for either intake or exhaust, said valve equipped with a valve spring and a seat and moveable between an open and closed position as controlled by said valve actuation device, a cam shaft with a cam for actuating said valve synchronously with said piston motion, said valve actuation device comprising: a cam configured for primary and secondary valve motion; a cam follower to transmit cam movement through a hydraulic circuit in fluid communication with said hydraulic fluid gallery into the valve between an open and closed position, and a fixed stroke accumulator selectively hydraulically controlled in said hydraulic circuit for loosing a portion of cam follower motion and to effect valve motion; an electro-hydraulic control having an on state and an off state and means for selective control of fixed stroke accumulator.
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