Fuel injector with needle control system that includes F, A, Z and E orifices
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United States of America Patent
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May 28, 2013
Grant Date -
May 10, 2012
app pub date -
Nov 8, 2010
filing date -
Nov 8, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A common rail fuel injector includes a needle valve member that moves to open and close nozzle outlets for a fuel injection event responsive to pressure in a needle control chamber. Between injection events, the needle control chamber is fluidly connected to the fuel inlet by a first pathway that includes a Z orifice, and fluidly connected to the fuel inlet by a second pathway that includes an F orifice, an intermediate chamber and an A orifice. During an injection event, the needle control chamber is fluidly connected to a drain outlet by a third pathway that includes the A orifice, the intermediate chamber and an E orifice. Different performance characteristics are achieved by adjusting the sizes of the respective of F, A, Z and E orifices.
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