Device and method for regenerating a particle filter arranged in the exhaust tract of an internal combustion engine

Abstract

The invention relates to a device and a method for regenerating a particulate filter arranged in the exhaust section of an internal combustion engine, having at least one NO oxidation catalytic converter, which is arranged upstream of the particulate filter, for the oxidation of NO in particular to form NO2. According to the invention, at least one heating device (8; 19) is also provided upstream of the particulate filter (6), by means of which heating device (8; 19) an exhaust-gas flow (2'') which is conducted to the particulate filter (6) can be heated to a defined temperature in accordance with defined regeneration parameters, in particular in accordance with a degree of loading of the particulate filter (6) and / or in accordance with an efficiency of an NO2-based regeneration of the particulate filter (6) by means of an NO2 quantity formed in the at least one NO oxidation catalytic converter (4).

Description

technical field [0001] The invention relates to a device for regenerating a particle filter arranged in an exhaust tract of an internal combustion engine according to the preamble of claim 1 and to a device according to the preamble of claim 8 A method for regenerating a particle filter arranged in an exhaust tract of an internal combustion engine. [0002] In particular, the invention relates to a method and a device for regenerating a particle filter for an internal combustion engine operated with an excess of air, such as a diesel or gasoline engine with direct injection, as it finds application, for example, in motor vehicles or commercial vehicles . Background technique [0003] In order to reduce carbon-containing fine particles, so-called particle separators or particle filters are often used in vehicles. A typical particle separator assembly in a vehicle is known, for example, from EP 10 727 65 A2. Such a particle separator thus differs from a particle filter in t...

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Problems solved by technology

This leads to the fact that the particles have to be oxidized by means of oxygen alone, since there is no NO in this stage 2 for use, which results in prolonged regeneration times and high CO emissions

[0027] At the same time, NO oxidation catalytic converters are far less stable than catalytic converters for hydrocarbon oxidation with respect to thermal damage, since irreversible sintering of the active elements and thus a loss of NO oxidation activity occur at temperatures above 550° C. decline

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