Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Reexamination Certificate
2006-05-09
2006-05-09
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
C123S305000, C123S276000
Reexamination Certificate
active
07040281
ABSTRACT:
A method of operating a gaseous-fueled internal combustion engine comprises selecting one of at least two predetermined operating modes as a function of engine load and engine speed. A first operating mode is selected when said engine is commanded to operate within a first region corresponding to a low load and low speed range, and a second operating mode is selected when said engine is commanded to operate within a second region distinct from said first region and corresponding to at least one of a greater load and a greater speed range compared to said first region. In the first operating mode, the gaseous fuel is introduced in a single injection event with the injection valve commanded to open with a constant amplitude A1. In the second operating mode, the gaseous fuel is introduced in a single injection event and the injection valve is commanded to begin with a constant amplitude A2for a predetermined time and then to open to an amplitude A3, wherein amplitude A3is greater than amplitude A2.
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Crawford John G.
Mann Kenneth R. C.
McAndrews Held & Malloy Ltd.
Westport Research Inc.
Wolfe, Jr. Willis R.
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