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. 13, 2019
Filed:
Apr. 14, 2017
Applicant:
Ford Global Technologies, Llc, Dearborn, MI (US);
Inventors:
Assignee:
Ford Global Technologies, LLC, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/02 (2006.01); F01N 3/20 (2006.01); F01N 11/00 (2006.01); F01N 13/00 (2010.01); F01N 3/08 (2006.01);
U.S. Cl.
CPC ...
F01N 3/206 (2013.01); F01N 3/0814 (2013.01); F01N 3/0842 (2013.01); F01N 11/00 (2013.01); F01N 13/0093 (2014.06); F01N 2430/06 (2013.01); F01N 2550/03 (2013.01); F01N 2560/025 (2013.01); F01N 2610/03 (2013.01); F01N 2900/1402 (2013.01); Y02T 10/24 (2013.01); Y02T 10/47 (2013.01);
Abstract
The present subject matter relates to a method and a treatment system monitor for monitoring an engine exhaust after-treatment system containing more than one Lean NOTraps (LNT). The method includes receiving an exhaust gas of a desired air-fuel ratio upstream of a respective LNT. The LNT is further regenerated using a richer than stoichiometric exhaust air-fuel ratio and subsequently an air-fuel ratio received downstream of the LNT is evaluated. Further, a working state of a respective LNT is determined based on the monitoring of the air-fuel ratio and oxygen level upstream and downstream of the LNT.