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:
Jun. 21, 2005
Filed:
Apr. 30, 2003
Patrick G. Szymkowicz, Shelby Township, MI (US);
Arjun D. Tuteja, Novi, MI (US);
Roger B. Krieger, Birmingham, MI (US);
Patrick G. Szymkowicz, Shelby Township, MI (US);
Arjun D. Tuteja, Novi, MI (US);
Roger B. Krieger, Birmingham, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Exhaust gas temperature is increased to improve the effectiveness of an after-treatment system having an activation temperature by deactivating one or more engine cylinders to increase the exhaust gas temperature from the remaining cylinders (during acceleration) or to decreasing exhaust gas flow rate (during deceleration or idling). In the system of the invention, a controller effects the deactivation and reactivation of cylinders and/or decrease and increase of exhaust gas flow in response to one or more sensors providing input of exhaust gas temperature or information from which exhaust gas temperature can be approximated. By achieving and maintaining the activation temperature, the present invention improves the effectiveness of after-treatment devices thereby lowering regulated emissions to desired levels.