Electro-hydraulic lost-motion valve train

Details Electro-hydraulic lost-motion valve train Electro-hydraulic lost-motion valve train

2006-07-18

2006-07-18

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090130, C123S19800E, C251S129190

Reexamination Certificate

active

07077083

ABSTRACT:
An electro-hydraulic lost motion system for variable valve activation including a master piston and an accumulation piston in a first bore, defining a hydraulic pressure chamber therebetween, in response to rotation of an engine cam. A slave piston in the engine head and hydraulically connected to the pressure chamber opens and closes an engine valve. A servo-valve behind the accumulation piston controls the mobility of the accumulation piston via a fluid control chamber. When the control chamber is made hydraulically rigid, the system actuates the engine valve. When the control chamber is vented through the servo-valve, the accumulation piston is movable in lost motion, preventing the engine valve from opening. All intermediate degrees of valve opening are possible. Preferably, the servo-valve, control chamber, accumulation piston, and a control piston are comprehended in a modular subassembly which may be positioned adjacent the master piston or the slave piston.

REFERENCES:
patent: 4716863 (1988-01-01), Pruzan
patent: 5934643 (1999-08-01), Cooke
patent: 6227154 (2001-05-01), Wakeman
patent: 6736092 (2004-05-01), Borean et al.
patent: 2003/0221663 (2003-12-01), Vanderpoel et al.

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