Electro-hydraulic engine valve actuation

Details Electro-hydraulic engine valve actuation Electro-hydraulic engine valve actuation

2007-03-27

2007-03-27

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C251S054000, C251S030010, C251S057000, C091S047000, C091S051000, C091S403000, C091S404000

Reexamination Certificate

active

11206601

ABSTRACT:
Hydraulic actuator as an element of a system for controlling an engine valve is presented. The actuator includes a fluidic actuation chamber, defined by an actuation piston that increases chamber volume as the actuation piston is urged away from a neutral. Chamber includes a high pressure fluid inlet and a fluid outlet. A fluidic actuator control chamber, defined by a control piston connected to the actuation piston that increases chamber volume as the actuation piston is urged away from neutral. A control fluid outlet is connected to a fluid control spool valve. The fluid outlet of the actuation chamber is fluidly connected to an inlet of the control valve. There is a valve actuation plunger operably connected to the actuation piston, and a drain outlet to maintain a fluidic backpressure to the actuator control chamber.

REFERENCES:
patent: 6386346 (2002-05-01), Kim et al.
patent: 6966285 (2005-11-01), Sun
patent: 7040266 (2006-05-01), Sun et al.

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