LOST MOTION FULL AUTHORITY VALVE ACTUATION SYSTEM

摘要

A lost motion valve actuation system utilizing a single solenoid valve (105) or trigger valve (80) to vary the timing of the intake (26) and exhaust (56) valves for a cylinder of an internal combustion engine. The solenoid controls the oil supply (100) to the tappets (20, 50), which in turn, determine valve motion in response to a camshaft lobe. The system allows independent control of each valve and provides for advanced features such as enhanced intake air swirl, two-valve or four-valve operation and staggered valve opening. The invention provides for valve operation even in the event of a total loss of system hydraulic pressure. The invention provides the practical benefits of a fully-variable system while preserving the security and reliability of a mechanical, cam-driven valve train. The invention provides for filling the exhaust and intake tappets (20, 50) independently without connecting their respective hydraulic circuits.