Lost motion full authority valve actuation system
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
Nov 4, 1998
filing date -
Nov 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lost motion variable valve actuation system utilizing a single solenoid valve or trigger valve to vary the timing of the intake and exhaust valves for a cylinder of an internal combustion engine. The solenoid controls the oil supply to the tappets, 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 independently without connecting their respective hydraulic circuits.
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