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. 18, 2017
Filed:
Mar. 01, 2016
Fev North America, Inc., Aachen, DE;
Tamas Szailer, Clarkston, MI (US);
Harsha Nanjundaswamy, Rochester Hills, MI (US);
Joel Deussen, Hartland, MI (US);
Dean Tomazic, Orion Township, MI (US);
FEV North America, Inc., Auburn Hills, MI (US);
Abstract
Methods and apparatuses for monitoring an oxidation catalyst in a vehicle exhaust system include a diesel internal combustion engine with an exhaust system that has an EGR, a DOC/DPF downstream from the EGR, an SCR catalyst downstream of the DOC/DPF, a first NOx sensor located upstream of the DOC/DPF, and a second NOx sensor located downstream of the SCR catalyst. A monitoring cycle of the exhaust system during operation of the diesel ICE includes executing a DPF regeneration event, shutting off the EGR, terminating urea dosing to the SCR catalyst, emptying NHstorage in the SCR catalyst, and intrusively maintaining the temperature of the DOC/DPF within a predetermined temperature range. Readings from the first NOx sensor and the second NOx sensor allow for a ratio between first NOx sensor readings and second NOx sensor readings, the ratio providing an indication as to whether or not the DOC/DPF is failing or operating properly.