The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2007
Filed:
May. 08, 2006
Kenneth R. C. Mann, Vancouver, CA;
John G. Crawford, Etobicoke, CA;
Kenneth R. C. Mann, Vancouver, CA;
John G. Crawford, Etobicoke, CA;
Westport Power Inc., , CA;
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.