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:
Sep. 22, 2009
Filed:
Nov. 30, 2006
William Lanier Easley, Jr., West Peoria, IL (US);
David Michael Milam, Dunlap, IL (US);
Stephan Donald Roozenboom, Washington, IL (US);
Michael Steven Bond, Chillicothe, IL (US);
Amir Kapic, Dunlap, IL (US);
William Lanier Easley, Jr., West Peoria, IL (US);
David Michael Milam, Dunlap, IL (US);
Stephan Donald Roozenboom, Washington, IL (US);
Michael Steven Bond, Chillicothe, IL (US);
Amir Kapic, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An exhaust treatment system for an engine is disclosed and may have an air induction circuit, an exhaust circuit, and an exhaust recirculation circuit. The air induction circuit may be configured to direct air into the engine. The exhaust circuit may be configured to direct exhaust from the engine and include a turbine driven by the exhaust, a particulate filter disposed in series with and downstream of the turbine, and a catalytic device disposed in series with and downstream of the particulate filter. The exhaust recirculation circuit may be configured to selectively redirect at least some of the exhaust from between the particulate filter and the catalytic device to the air induction circuit. The catalytic device is selected to create backpressure within the exhaust circuit sufficient to ensure that, under normal engine operating conditions above low idle, exhaust can flow into the air induction circuit without throttling of the air.