Fuel injector with boosted needle closure
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United States of America Patent
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Aug 4, 2009
Grant Date -
Apr 17, 2008
app pub date -
Oct 15, 2007
filing date -
Oct 17, 2006
priority date (Note) -
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Abstract
Fuel injectors with boosted needle control providing controlled and rapid needle closure. Boost and drive pistons are provided for hydraulic actuation to controllably close the needle, with the boost piston reaching a mechanical stop before the needle reaches the closed position, with the drive piston alone providing adequate hydraulic force to hold the needle closed. In a preferred embodiment, fuel from the intensifier is coupled to the top of the boost and drive pistons to close the needle, and controllably coupled to the bottom of the boost and drive pistons to allow pressure in the needle chamber to open the needle. Apparatus for control of fuel pressure to the bottom of the boost and drive pistons is disclosed.
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