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:
Jul. 21, 2009
Filed:
Jan. 07, 2008
Eberhard Jacob, Krailing, DE;
Eberhard Jacob, Krailing, DE;
Emitec Gesellschaft Fuer Emissiontechnologie mbH, Lohmar, DE;
Abstract
A method for reducing the particle and nitrogen oxide proportion in an exhaust gas flow of an internal combustion engine includes supplying a reducing agent to the exhaust gas flow, subjecting the exhaust gas flow containing the reducing agent to particle filtering, and then carrying out a selective catalytic reduction of at least a portion of the nitrogen oxides in the exhaust gas flow. The method and an exhaust gas treatment unit make it possible to simultaneously reduce the proportion of particles and nitrogen oxides in the exhaust gas. Ammonia, in particular, is used as the reducing agent. Regeneration of the particle filter is promoted by leading an ammonia-containing flow of gas through the particle filter. The method and device make it possible to consume less fuel with the same reaction rate and, at the same time to reduce available installation space, in comparison with existing corresponding prior art systems.