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Hydraulic engine valve actuation system including independent feedback control

United States Patent

8,453,619
June 4, 2013
View the Complete Patent at the US Patent & Trademark Office
A hydraulic valve actuation assembly may include a housing, a piston, a supply control valve, a closing control valve, and an opening control valve. The housing may define a first fluid chamber, a second fluid chamber, and a third fluid chamber. The piston may be axially secured to an engine valve and located within the first, second and third fluid chambers. The supply control valve may control a hydraulic fluid supply to the piston. The closing control valve may be located between the supply control valve and the second fluid chamber and may control fluid flow from the second fluid chamber to the supply control valve. The opening control valve may be located between the supply control valve and the second fluid chamber and may control fluid flow from the supply control valve to the second fluid chamber.
Marriott; Craig D. (Clawson, MI)
GM Global Technology Operations LLC (
12/ 984,233
20120168654
January 4, 2011
GOVERNMENT LICENSE RIGHTS The Government of the United States of America has rights in this invention pursuant to Contract No. DE-FC26-05NT-42415 awarded by the United States Department of Energy.