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:
Dec. 01, 2009
Filed:
Jul. 27, 2006
Johannes Walter Reuter, Ypsilanti, MI (US);
Subbaraya Radhamohan, Novi, MI (US);
Dmitry Arie Shamis, Commerce Twp, MI (US);
Christian Thomas Chimner, Royal Oaks, MI (US);
Johannes Walter Reuter, Ypsilanti, MI (US);
Subbaraya Radhamohan, Novi, MI (US);
Dmitry Arie Shamis, Commerce Twp, MI (US);
Christian Thomas Chimner, Royal Oaks, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A method is provided for regenerating a LNT in a diesel engine exhaust aftertreatment system. Typically, the aftertreatment system comprises a fuel reformer, a LNT, and a SCR catalyst in that order. Over the course of the regeneration, the concentration or flow rate of syn gas is increased, peaked, and then reduced. Preferably, the syn gas concentration or flow rate and the fuel reformer temperature are simultaneously controlled using at least a fuel injector and an engine intake air throttle. The pattern of increasing the syn gas concentration or flow rate during a first part of the regeneration and decreasing the syn gas concentration of flow rate in a latter part of the regeneration reduces the fuel penalty for the regeneration and improves the ammonia production rate as compared to a system in which the syn gas concentration or flow rate is essentially constant throughout the regeneration.