Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1998-09-09
2000-04-04
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9011, 251 3001, F01L 902
Patent
active
060448156
ABSTRACT:
A hydraulically-assisted engine valve actuator and method for assisting in the actuation of an engine valve includes a translatable pilot valve that is operably coupled to and controlled by a pilot valve positioning system. A servo piston is in fluid communication with the pilot valve and is operably coupled to the engine valve. The pilot valve positioning system controls translation of the pilot valve to meter hydraulic fluid under pressure to and from the servo piston. The hydraulic fluid under pressure causes the servo piston to closely follow the translation of the pilot valve to effect a desired profile of translational opening and closing motion of the engine valve.
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Calfa Jeffrey P.
Lo Weilun
Navistar International Transportation Corp.
Sullivan Dennis Kelly
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