Fuel injection system and method of operation for a gaseous fuelled engine with liquid pilot fuel ignition
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United States of America Patent
Stats
-
Mar 18, 2008
Grant Date -
Oct 26, 2006
app pub date -
Mar 24, 2006
filing date -
Sep 26, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pilot fuel injection valve is mountable in a cylinder head of an engine and injects a liquid pilot fuel directly into a combustion chamber. The pilot fuel injection valve comprises a cooling system to keep the pilot fuel at a temperature that is lower than the lowest initial boiling point for the pilot fuel that occurs inside the fuel injection valve. The pilot fuel injection valve further comprises a thermally insulated nozzle having an outer surface that is not cooled by the cooler cylinder head and the cooler pilot fuel held inside the fuel injection valve. During operation, the nozzle's outer surface can be heated to a temperature that is not significantly lower than the final boiling point of the pilot fuel so that a significant amount of pilot fuel does not condense on the nozzle surface during engine operation.
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