Loading patent…
AssigneeUmicore Galvanotechnik GmbH
InventorsJürgen Gieshoff, Martin Votsmeier, Frank-Walter Schütze, Marcus Pfeifer, Egbert Lox, Thomas Kreuzer
Estimating the term…
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.
An exhaust-gas purification system for the exhaust gases of an internal combustion engine (2) of a motor-vehicle comprising a converter shell (6) that is arranged in the exhaust-gas system closely coupled to an engine outlet and includes a first oxidation catalyst (7) that is not part of an underfloor area of the motor vehicle, and a hydrocarbon adsorber (4) having up to 0.1 g/L platinum on the hydrocarbon adsorber, wherein the platinum minimizes coking of the hydrocarbon adsorber and the hydrocarbon adsorber is arranged closely upstream of a particulate filter (5) in the underfloor area of the motor vehicle and downstream of the converter shell (6) wherein (i) the particulate filter is a wall flow filter, which is coated with a second oxidation catalyst on an entry side thereof, and (ii) the hydrocarbon adsorber and the wall flow filter are both disposed in one converter housing, wherein the particulate filter is separated from the hydrocarbon adsorber, and the engine comprises a diesel engine.
Dependencies are inferred from the claim text.