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:
Mar. 07, 2006
Filed:
Dec. 03, 2004
Martin L. Willi, Dunlap, IL (US);
Brett M. Bailey, Peoria, IL (US);
Scott B. Fiveland, East Norwich, NY (US);
Weidong Gong, Dunlap, IL (US);
Martin L. Willi, Dunlap, IL (US);
Brett M. Bailey, Peoria, IL (US);
Scott B. Fiveland, East Norwich, NY (US);
Weidong Gong, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A method and apparatus for operating an internal combustion engine is provided. The method comprises the steps of introducing a primary fuel into a main combustion chamber of the engine, introducing a pilot fuel into the main combustion chamber of the engine, determining an operating load of the engine, determining a desired spark plug ignition timing based on the engine operating load, and igniting the primary fuel and pilot fuel with a spark plug at the desired spark plug ignition timing. The method is characterized in that the octane number of the pilot fuel is lower than the octane number of the primary fuel.