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:
Jun. 05, 2012
Filed:
Oct. 20, 2009
Giovanni Cavataio, Dearborn, MI (US);
Jeong Yeol Kim, Troy, MI (US);
Michael Goebelbecker, Dearborn Heights, MI (US);
Paul M Laing, Canton, MI (US);
Christine Kay Lambert, Dearborn, MI (US);
Giovanni Cavataio, Dearborn, MI (US);
Jeong Yeol Kim, Troy, MI (US);
Michael Goebelbecker, Dearborn Heights, MI (US);
Paul M Laing, Canton, MI (US);
Christine Kay Lambert, Dearborn, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
Systems and methods for reducing NOx emissions using a branched exhaust system with a first and second turbine including an emission-control device containing a zeolite, are described. In one example approach, a method comprises: during a first duration when exhaust temperature is below a first temperature threshold, directing exhaust gas through the second turbine and the emission-control device, and adjusting the second turbine to control intake boost; and during a second duration following the first, directing exhaust gas through the first turbine, and adjusting the first turbine to control intake boost. In this way, the first and second turbines may provide a greater degree of boost control in order to reduce boost fluctuations while enabling storing cold start NOx emissions for later reduction.