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. 17, 2013
Filed:
Oct. 06, 2011
Applicant:
Nicholas Michael Zayan, Fenton, MI (US);
Inventor:
Nicholas Michael Zayan, Fenton, MI (US);
Assignee:
AVL North America, Inc., Plymouth, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01N 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In one implementation of the disclosed technique, a NOx sensor polynomial algorithm is used to discriminate between NOx and ammonia emission. The polynomial algorithm uses the SCR's time constant property to infer the 'loading state' of the SCR and estimate both the NOx conversion and quantity of ammonia slip. The polynomial algorithm assesses this by differentially analyzing the upstream and downstream NOx sensor signals through a comparison of the polynomial coefficients.