Hydraulically operated valve actuation and internal combustion engine with such a valve actuation
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United States of America Patent
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Feb 26, 2013
Grant Date -
Dec 9, 2010
app pub date -
Nov 19, 2008
filing date -
Nov 23, 2007
priority date (Note) -
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Abstract
According to the invention, recuperation may be optimized for a hydraulically-operated gas exchange valve by provision of two fluid-filled pressure chambers and a movable regulating piston with two active faces each defining one of the pressure chambers. The pressure chambers are each connected to two hydraulic valves of which the first hydraulic valves may be pressurized from a first pressure reservoir and the second hydraulic valves may be connected to a base pressure reservoir. The first hydraulic valves may furthermore be connected to a second pressure reservoir. A control or regulation device switches the valves, from a rest position in a first accelerating phase and a braking phase. The second pressure reservoir is provided as pressure buffer for providing the pressure in the first pressure reservoir and/or for providing pressure for the fuel pump and/or for the fuel supply to an internal combustion engine and/or for providing pressure for a further gas exchange valve in the same or another combustion cylinder of the internal combustion engine.
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