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:
Nov. 25, 2014
Filed:
Feb. 25, 2012
Jess W. Gingrich, San Antonio, TX (US);
Terrence F. Alger, Ii, San Antonio, TX (US);
Raphael Gukelberger, San Antonio, TX (US);
Jess W. Gingrich, San Antonio, TX (US);
Terrence F. Alger, II, San Antonio, TX (US);
Raphael Gukelberger, San Antonio, TX (US);
Southwest Research Institute, San Antonio, TX (US);
Abstract
A method using exhaust gas recirculation (EGR) in an internal combustion engine. The engine has at least one 'dedicated EGR cylinder', whose entire exhaust is recirculated back to all the engine cylinders. The dedicated EGR cylinder is operated at a rich air-fuel ratio, and the other cylinders are operated stoichiometrically so that a conventional three way catalyst may be used to treat the exhaust. A fuel injector is used to inject fuel into the combustion chamber of the dedicated EGR cylinder after initiation of the main combustion event. This post injection method overcomes flammability limits of a dedicated EGR cylinder, and increases the hydrogen (H2) and carbon monoxide (CO) in its exhaust.