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:
Jul. 23, 2002
Filed:
Nov. 15, 2000
Frank Ament, Troy, MI (US);
David B. Brown, Brighton, MI (US);
David A. Frank, Rochester Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An improved method of “adaptive” control that optimizes NO conversion efficiency while minimizing fuel consumption. This method limits the NO level in the feedstream to a NO catalyst to a level that the catalyst can process by adjusting certain engine parameters, namely exhaust gas recirculation percentage, air-to-fuel ratio, and spark ignition timing in a spark-ignition engine or fuel injection timing in a compression-ignition engine. This method results in improved fuel efficiency over previous methods of controlling NO emissions by allowing longer periods of lean operations.