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:
Aug. 21, 2012
Filed:
Jun. 16, 2009
Joseph Robert Theis, Rockwood, MI (US);
Joseph Robert Theis, Rockwood, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
According to at least one aspect of the present invention, there is provided an emission control system which includes a reductant injector injecting a pre-determined amount of a reductant into a vehicle exhaust passage, and sensors measuring an exhaust space velocity, a selective catalytic reduction (SCR) catalyst temperature, and a before-SCR nitrogen oxide (NO) concentration, wherein the predetermined amount of the reductant is a function of the exhaust space velocity, the before-SCR NOconcentration, and the SCR catalyst temperature. In at least one particular embodiment, the predetermined amount of the reductant is measured according to equation (I) y=ax; wherein y is the flow of the reductant; x is the product of the exhaust space velocity and the before-SCR NOconcentration; and 'a' and 'n' are each independently a function of the catalytic temperature (“T”) of the selective catalytic reduction catalyst.