Internal-combustion engines – Combustion chamber means having fuel injection only – Having a particular relationship between injection and...
Reexamination Certificate
2007-10-16
2007-10-16
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Having a particular relationship between injection and...
C123S299000, C123S260000
Reexamination Certificate
active
11382208
ABSTRACT:
A method of injecting gaseous fuel into an internal combustion engine comprises selecting one of at least two predetermined operating modes as a function of engine load and engine speed. The engine includes a fuel injection valve with an actuator for changing a commanded amplitude for lifting a valve needle during injection, and for changing, from one combustion cycle to the next, the shape of an actuation pulse defined by commanded amplitude plotted against time. In a first operating mode, which corresponds to low load and low speed range, the actuation pulse has a rectangular shape. In a second operating mode, which corresponds to at least one of a greater load and a greater speed range, the actuation pulse includes at least two shape-defining segments with the commanded amplitude for the first segment being less than 90% of the amplitude for a subsequent second segment.
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Crawford John G.
Mann Kenneth R. C.
Hoang Johnny H.
McAndrews Held & Malloy Ltd.
Westport Power Inc.
Wolfe Willis R.
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