Method for avoiding an internal coking of an injection hole for injection holes in a multi-hole injection valve
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United States of America Patent
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Jul 25, 2006
Grant Date -
Feb 10, 2005
app pub date -
Jul 26, 2002
filing date -
Sep 15, 2001
priority date (Note) -
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Abstract
A method for avoiding an injector orifice internal coking of the spray orifices of a multi-orifice fuel injector of a direct injection internal combustion engine, e.g., of a motor vehicle, is provided. Fuel is injected into a combustion chamber of the internal combustion engine by multiple injections. The fuel is injected by a first main injection during the intake stroke and by a subsequent postinjection during the compression stroke before the ignition time. Thereby, during a long operation of the internal combustion engine, especially in a homogeneous operation, the injection time does not have to be continually increased in order to compensate for the increasingly shrinking cross section of the spray orifices.
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