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:
Oct. 28, 2014
Filed:
Jul. 11, 2012
Stephen Paul Levijoki, Swartz Creek, MI (US);
Brett B. Thompson, Farmington Hills, MI (US);
Justin A. Shetney, Livonia, MI (US);
Paul Jasinkiewicz, Northville, MI (US);
Stephen Paul Levijoki, Swartz Creek, MI (US);
Brett B. Thompson, Farmington Hills, MI (US);
Justin A. Shetney, Livonia, MI (US);
Paul Jasinkiewicz, Northville, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An exhaust diagnostic system comprises a selective catalyst reduction (SCR) component testing module, an exhaust stream temperature management module, and a test enabling module. The component testing module executes an SCR component efficiency test. The exhaust stream temperature management module adjusts a temperature of the SCR component to a predetermined temperature range. The test enabling module executes a process for depleting a reductant load and subsequently initiates an SCR component efficiency test while the temperature of the SCR catalyst is within the predetermined temperature range. A method for diagnosing an exhaust system comprises determining an efficiency of an SCR component and selectively adjusting a temperature of the SCR component to a predetermined temperature range. The method also includes executing a process for depleting a reductant load and initiating an SCR component efficiency test while the temperature of the SCR component is within the predetermined temperature range.