US 7,555,998 B2
System and method for hydraulic valve actuation
Zhou Yang, South Windsor, Conn. (US); Andrew Brzoska, Burlington, Conn. (US); Brian Ruggiero, East Granby, Conn. (US); David B Smith, Westfield, Mass. (US); James Judd, Union, S.C. (US); Neil Fuchs, New Hartford, Conn. (US); and Michael Dailey, Bloomfield, Conn. (US)
Assigned to Jacobs Vehicle Systems, Inc., Bloomfield, Conn. (US)
Filed on Dec. 01, 2005, as Appl. No. 11/290,518.
Prior Publication US 2007/0125327 A1, Jun. 07, 2007
Int. Cl. F01L 9/02 (2006.01)
U.S. Cl. 123—90.12  [123/90.15; 251/129.15] 23 Claims
OG exemplary drawing
 
1. A variable valve actuation system for an internal combustion engine valve comprising:
a hydraulic valve actuation system operatively connected to the engine valve;
a first control valve operatively connected to the hydraulic valve actuation system, said first control valve adapted to selectively release hydraulic fluid from the hydraulic valve actuation system to close the engine valve; and
a second control valve operatively connected to the hydraulic valve actuation system, said second control valve adapted to selectively release hydraulic fluid from the hydraulic valve actuation system to close the engine valve independent of the operation of the first control valve to selectively release hydraulic fluid from the hydraulic valve actuation system, and wherein said first control valve is further adapted to selectively release hydraulic fluid from the hydraulic valve actuation system independent of the operation of the second control valve.