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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.:

US 9903291 B1

PDFFull Text
Date of Patent:
Feb. 27, 2018

Filed:

Sep. 23, 2014

Method of controlling nox by pna

Applicant:

Ford Global Technologies, Llc, Dearborn, MI (US);

Inventors:

Joseph Robert Theis, Rockwood, MI (US);

Christine Kay Lambert, Dearborn, MI (US);

Justin Anthony Ura, Livonia, MI (US);

Assignee:

Ford Global Technologies, LLC, Dearborn, MI (US);

Attorneys:

Julia Voutyras

McCoy Russell LLP

Primary Examiner:

Binh Q Tran

Int. Cl.
CPC ...
F01N 3/00 (2006.01); F02D 41/14 (2006.01); F01N 13/00 (2010.01); F01N 3/20 (2006.01); F02D 41/00 (2006.01); F02D 41/30 (2006.01); F02D 41/06 (2006.01); F02D 41/40 (2006.01); F02D 41/02 (2006.01); F01N 9/00 (2006.01); F01N 3/08 (2006.01);
U.S. Cl.
CPC ...
F02D 41/1462 (2013.01); F01N 3/2066 (2013.01); F01N 9/00 (2013.01); F01N 13/008 (2013.01); F01N 13/009 (2014.06); F02D 41/005 (2013.01); F02D 41/0235 (2013.01); F02D 41/064 (2013.01); F02D 41/1461 (2013.01); F02D 41/1463 (2013.01); F02D 41/30 (2013.01); F02D 41/401 (2013.01); F01N 3/0807 (2013.01); F01N 3/0842 (2013.01); F01N 2410/06 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1602 (2013.01); F01N 2900/1614 (2013.01); F02D 41/402 (2013.01); F02D 2200/0802 (2013.01); F02D 2200/0811 (2013.01); Y02T 10/24 (2013.01); Y02T 10/44 (2013.01); Y02T 10/47 (2013.01);
Abstract

Methods and systems are provided for reducing engine cold-start emissions. An exhaust system having a passive NOx adsorber (PNA) may store NOx during an engine cold-start until conditions are optimal for release of the stored NOx to a downstream SCR catalyst. Based on PNA conditions, including a NOx load and a PNA bed temperature, adjustments to EGR rate and/or injection timing may be made to achieve a catalytically favorable ratio of NOx species upstream of the SCR catalyst, after the SCR catalyst has reached its light-off temperature.

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