Variable valve actuation and engine braking
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United States of America Patent
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Mar 10, 2009
Grant Date -
Jan 10, 2008
app pub date -
Jun 29, 2007
filing date -
Jun 29, 2006
priority date (Note) -
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Abstract
Systems and methods of actuating two engine valves associated with a common engine cylinder using one or more lost motion systems and one or more control valves are disclosed. The control valves are capable of selectively trapping hydraulic fluid in the lost motion systems for auxiliary engine valve actuations and selectively releasing the hydraulic fluid to default to cam controlled valve seating of the engine valves. The systems may provide a combination of main exhaust, compression release, exhaust gas recirculation and early exhaust valve opening in preferred embodiments.
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