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:
Jan. 27, 2015
Filed:
Apr. 18, 2012
Edward M. Derybowski, Hanover Park, IL (US);
Brad J. Adelman, Chicago, IL (US);
Shyam Santhanam, Aurora, IL (US);
Edward M. Derybowski, Hanover Park, IL (US);
Brad J. Adelman, Chicago, IL (US);
Shyam Santhanam, Aurora, IL (US);
International Engine Intellectual Property Company, LLC., Lisle, IL (US);
Abstract
An exhaust after-treatment system is described. Generally speaking, the system includes separate primary and secondary NOreducing systems for delivering reductant (e.g. urea and ammonia) to an exhaust stream, a sensor system for determining relevant operating conditions and an electronic control module for activating the reducing systems. The two NOreducing systems include flow control modules coupled to the electronic control module. Methods for reducing NOin an exhaust stream are also described. Generally speaking, the methods include the steps of determining a need for NOreduction in an exhaust stream, determining temperature of exhaust stream, and injecting at least one of a primary reductant and a secondary reductant into the exhaust stream based on the determined temperature of the exhaust stream. Typically, the primary reductant comprises urea and the secondary reductant comprises ammonia.