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:
Jun. 18, 2019
Filed:
Sep. 09, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Jon C. Miller, Fenton, MI (US);
Michael A. Smith, Clarkston, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
Provided is a method for controlling an exhaust gas treatment system, wherein the system includes an exhaust gas stream supplied by an exhaust gas source to a selective catalytic reduction (SCR) device and a particulate filter device. The method comprises detecting a threshold level of reductant deposits proximate the SCR device, and initiating a selective catalytic reduction device service in response thereto. A threshold level of reductant deposits is detected using a reductant deposit model comprising determining an actual SCR NOconversion using measured process variables; and comparing the actual SCR NOconversion to a calibrated NOconversion value. The calibrated NOconversion value is determined using exhaust gas flow and system temperature values which substantially correspond to the process variables under which the actual SCR NOconversion was determined. The device service can include increasing the exhaust gas temperature or initiating an active regeneration of the particulate filter device.