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. 20, 2012
Filed:
May. 12, 2004
Jürgen Gieshoff, Biebergemünd, DE;
Martin Votsmeier, Maintal, DE;
Frank-walter Schütze, Rodenbach, DE;
Marcus Pfeifer, Solingen, DE;
Egbert Lox, Hochwaldhausen, DE;
Thomas Kreuzer, Karben, DE;
Jürgen Gieshoff, Biebergemünd, DE;
Martin Votsmeier, Maintal, DE;
Frank-Walter Schütze, Rodenbach, DE;
Marcus Pfeifer, Solingen, DE;
Egbert Lox, Hochwaldhausen, DE;
Thomas Kreuzer, Karben, DE;
Umicore Galvanotechnik GmbH, Schwabisch Gmund, DE;
Abstract
The present invention describes an exhaust-gas purification system for an internal combustion engine made of an oxidation catalyst arranged close to the engine, a subsequent hydrocarbon adsorber and a particulate filter arranged downstream thereof and provided with another oxidation catalyst. The oxidation catalyst ensures that emission limits with respect to carbon monoxide and hydrocarbons are satisfied in normal driving mode. During operating states with exhaust-gas temperatures below about 200° C., the oxidation catalyst can no longer oxidize carbon monoxide and hydrocarbons. Instead, the hydrocarbons are adsorbed by the hydrocarbon adsorber during these operating phases. In order to initiate the periodical regeneration of the particulate filter, the exhaustgas temperature of the internal combustion engine is raised by engine modifications. The increased exhaust-gas temperature leads to desorption of the previously stored hydrocarbons, which are then burned at the oxidation catalyst of the particulate filter, thereby supporting the regeneration of the particulate filter.