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:
Mar. 02, 2010
Filed:
Oct. 19, 2006
Friedemann Rohr, Hanau, DE;
Lutz Marc Ruwisch, Darmstadt, DE;
Markus Koegel, Seligenstadt, DE;
Juliane Kluge, Munich, DE;
Ulrich Goebel, Hattersheim, DE;
Friedemann Rohr, Hanau, DE;
Lutz Marc Ruwisch, Darmstadt, DE;
Markus Koegel, Seligenstadt, DE;
Juliane Kluge, Munich, DE;
Ulrich Goebel, Hattersheim, DE;
Umicore AG & Co. KG, Hanau-Wolfgang, DE;
Abstract
A nitrogen oxide storage catalytic converter which is operated for a relatively long time at low exhaust-gas temperatures in the range between 120 and 250° C. exhibits a decreasing storage capacity as a result of incomplete regeneration at said temperatures. In order to re-establish the original storage capacity of the catalytic converter which is operated in this way, two-stage regeneration is proposed, wherein the storage catalytic converter is initially partially regenerated at the low exhaust gas temperature by means of a switch from the lean mode to the rich mode, and wherein subsequently, with rich exhaust gas again, the exhaust-gas temperature of the engine is raised into a range of between 300 and 400° C. for complete regeneration.