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:
Nov. 29, 2011
Filed:
Jan. 02, 2008
Steven Fraser, Indianapolis, IN (US);
Steven Fraser, Indianapolis, IN (US);
Cummins IP, Inc, Minneapolis, MN (US);
Abstract
An apparatus, system, and method are disclosed for real-time diagnosis of a NO-adsorption catalyst (NAC). The method includes verifying that a NAC temperature exceeds a threshold, determining that the NAC is in a steady-state operating condition, and surveying a first oxygen sensor upstream of the NAC and a second oxygen sensor downstream of the NAC. The method further includes calculating a lambda difference between the first and second oxygen sensors, and interpreting a NAC regeneration indicator. The method further includes determining a lean-to-rich transition and a rich-to-lean transition area based on the lambda difference and the regeneration indicator. The method concludes with setting a NAC function indicator according to the lean-to-rich transition area and the rich-to-lean transition area.