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. 24, 2012
Filed:
Feb. 20, 2008
Paul Spurk, Weiterstadt, DE;
Stèphanie Frantz, Hanau, DE;
Thomas Le Tallec, Sartrouville, FR;
Olivier Teysset, Poissy, FR;
Wilfried Mueller, Karben, DE;
Gerald Jeske, Neuberg, DE;
Paul Spurk, Weiterstadt, DE;
Stèphanie Frantz, Hanau, DE;
Thomas Le Tallec, Sartrouville, FR;
Olivier Teysset, Poissy, FR;
Wilfried Mueller, Karben, DE;
Gerald Jeske, Neuberg, DE;
Umicore AG & Co. KG, Hanau-Wolfgang, DE;
Abstract
Soot filters for removing soot from the exhaust gas of lean-burn engines become blocked with progressive operating duration on account of the deposition of soot, and must therefore be regenerated at regular intervals. It has been found that reliable operation of the soot filter is possible only if an active regeneration is carried out from time to time by increasing the exhaust-gas temperature to the soot ignition temperature. For this purpose, an oxidation catalytic converter is usually arranged upstream of the soot filter, and the exhaust-gas temperature is increased by means of the catalytic combustion of additionally injected fuel. Here, the oxidation catalytic converter is subjected to high temperature loading and therefore ages very quickly. It has surprisingly been found that the ageing of the oxidation catalytic converter can be slowed if said oxidation catalytic converter is split into at least two separate catalytic converters and the distance between said separate catalytic converters is 2 to 30 mm.