Valve actuating device, and method for controlling same
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United States of America Patent
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-
Mar 29, 2005
Grant Date -
Jun 17, 2004
app pub date -
Aug 29, 2003
filing date -
Oct 5, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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