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:
Jul. 05, 2016
Filed:
Apr. 09, 2014
Ford Global Technologies, Llc, Dearborn, MI (US);
Frank Korpics, Belleville, MI (US);
Dean Pennala, Howell, MI (US);
Devesh Upadhyay, Canton, MI (US);
Hao Wu, Kitchener, CA;
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
Systems and methods for detecting ammonia slip in an exhaust system based upon transient NOx sensor responses are described. In one example method, an exhaust system allocates tailpipe NOx sensor output to NOx and NHlevels responsive to the transient sensors using a segment length method that processes the transient signals based on the total segment lengths calculated within a window. A ratio of segment lengths relative to a threshold is determined for a measured and expected NOx rate of change downstream of an SCR that is further used to determine a probability of NOx and NHbased on the measured sensor activities, and a controller is included to adjust one or more parameters based on the allocation and changes of sensor output.