Valve actuating device, and method for controlling same

Details Valve actuating device, and method for controlling same Valve actuating device, and method for controlling same

2005-03-29

2005-03-29

Barrera, Ramon M. (Department: 2832)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090140, C251S061000, C251S062000, C251S063000, C251S063500

Reexamination Certificate

active

06871618

ABSTRACT:
A device and control method for actuating valves of a motor vehicle internal combustion engine including at least a controlled hydraulic actuator actuating the associated valve that is provided in the form of a cylinder. A mobile piston connected to the valve delimits two opposite hydraulic pressure chambers each supplied with an incompressible fluid and pressure regulated by a control unit such that the pressure prevailing in one of the chambers is alternately higher/lower than that which prevails in the other chamber to actuate the valve. Each pressure chamber of the cylinder is capable of communicating with a corresponding actuating hydraulic pressure source, which includes a pneumatic return mechanism for the fluid.

REFERENCES:
patent: 3682152 (1972-08-01), Muller-Berner
patent: 5255641 (1993-10-01), Schechter
patent: 5765515 (1998-06-01), Letsche
patent: 5833209 (1998-11-01), Steinrueck
patent: 5992819 (1999-11-01), Asskildt et al.

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