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:
Aug. 12, 2014
Filed:
May. 12, 2011
Min Sun, Troy, MI (US);
Jean-yves Lavallee, Farmington Hills, MI (US);
Min Sun, Troy, MI (US);
Jean-Yves Lavallee, Farmington Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An internal combustion engine is configured to operate in a compression-ignition combustion mode and includes an exhaust aftertreatment system having an ammonia-selective catalytic reduction device. A method for operating the engine includes determining a present engine NOx generation rate, determining a NOx reduction rate of the ammonia-selective catalytic reduction device, determining an ammonia slip rate from the ammonia-selective catalytic reduction device corresponding to the NOx reduction rate of the ammonia-selective catalytic reduction device and the present engine NOx generation rate, and controlling engine operation to adjust the present engine NOx generation rate in response to the ammonia slip rate from the ammonia-selective catalytic reduction device.