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:
Jan. 25, 2005
Filed:
Jul. 09, 2002
Jason J. Rasmussen, Sparland, IL (US);
Kevin P. Duffy, E. Peoria, IL (US);
Kurtis M. Best, Princeville, IL (US);
Matthew R. Roth, Metamora, IL (US);
Jason J. Rasmussen, Sparland, IL (US);
Kevin P. Duffy, E. Peoria, IL (US);
Kurtis M. Best, Princeville, IL (US);
Matthew R. Roth, Metamora, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A method for operating an engine at idle that reduces NOand controls smoke and hydrocarbon emissions. An idle delivery quantity of fuel is determined and divided into a first quantity of fuel and a second quantity of fuel in approximately equal quantities. During a compression stroke of an engine piston, the first quantity of fuel is injected into an engine cylinder. Adjusting at least one of timing and quantity of the injection of the first quantity of fuel reduces, at least in part, NOemissions. At a timing angle of at least thirty degrees after the first quantity of fuel is injected and after the first quantity of fuel has been burned, there is an injection of the second quantity of fuel. Adjusting at least one of timing and quantity of the injection of the second quantity of fuel reduces, at least in part, smoke emissions.