Electrohydraulic valve actuator assembly

Details Electrohydraulic valve actuator assembly Electrohydraulic valve actuator assembly

2005-12-06

2005-12-06

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090130

Reexamination Certificate

active

06971347

ABSTRACT:
A value actuator assembly for an engine includes a movable engine valve a movable spool valve and dual feedback channels with flow regulated by a pair of orifices. The valve actuator assembly also includes a driving channel interconnecting the spool valve and the engine valve. The feedback channels interconnecting the engine valve and the spool valve. First and second feedback channels communicate between the second and third fluid chambers and fourth and fifth fluid chambers of the spool valve. Orifices restrict fluid flow through the feedback channels as needed to actuate the spool valve and thereby improve valve controllability.

REFERENCES:
patent: 5421545 (1995-06-01), Schexnayder
patent: 5456222 (1995-10-01), Schechter
patent: 5638781 (1997-06-01), Sturman
patent: 6109284 (2000-08-01), Johnson et al.
patent: 6263842 (2001-07-01), De Ojeda et al.
SAE Technical Paper Serial 2002-01-1109, “Production Elector-Hydraulic Variable Valve-Train for a New Generation of I.C. Engines”, Jeff Allen and Don Law; Mar. 4-7, 2002; pp 9.

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