Self-regulating electrohydraulic valve actuator assembly

Details Self-regulating electrohydraulic valve actuator assembly Self-regulating electrohydraulic valve actuator assembly

2005-08-16

2005-08-16

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090110, C123S090130, C251S030010, C251S129030, C251S129150

Reexamination Certificate

active

06928966

ABSTRACT:
A valve actuator assembly for an engine includes a movable engine valve, a movable spool valve and four on/off valves. An intermediate channel interconnects the spool valve and first and second on/off valves. A driving channel connects the spool valve and a first fluid chamber for driving the engine valve. First and second feedback channels communicate between the second and third fluid chambers and fourth and fifth fluid chambers of the spool valve. Third and fourth on/off valves enable and disable the feedback channels to improve valve controllability.

REFERENCES:
patent: 5456222 (1995-10-01), Schechter
patent: 5638781 (1997-06-01), Sturman
patent: 6109284 (2000-08-01), Johnson et al.
patent: 6173685 (2001-01-01), Sturman
patent: 6263842 (2001-07-01), DeOjeda et al.
patent: 6739293 (2004-05-01), Turner et al.
patent: 6837196 (2005-01-01), Sun
patent: 1464794 (2004-10-01), None

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