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

Abstract

The invention relates to a method for regenerating a particulate filter arranged in the exhaust gas tract of an internal combustion engine, having at least one NO oxidation catalytic converter arranged upstream of the particle filter for the oxidation of NO, in particular to form NO2, and having at least one heating device for raising the temperature of an exhaust gas stream. According to the invention, by means of the at least one heating device (8), a defined quantity of thermal energy is produced, with which the temperature of the NO oxidation catalytic converter (4) is set in a defined temperature range, wherein the temperature range is preferably predefined as a function of a level of loading of the particulate filter (6) with carbon black and / or of an efficiency of the NO2-based regeneration of the particle filter (6) by means of the quantity of NO2 formed at the at least one NO oxidation catalytic converter (4).

Description

technical field [0001] The invention relates to a method for regenerating a particle filter arranged in an exhaust tract of an internal combustion engine and a device 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 of an internal combustion engine operated with excess air, such as a diesel engine or a gasoline engine with direct injection, which are used, for example, in passenger cars or trucks. Background technique [0003] To minimize carbonaceous fine particles, so-called particle separators or particle filters are often used in motor vehicles. A typical construction of a particle separator for use in motor vehicles is known, for example, from EP 10 727 65 A2. Such a particle separator differs from a particle filter in that the exhaust gas flow is guided along the separator structure, whereas in a particle filter the...

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Problems solved by technology

This leads to the oxidation of the particles only by means of oxygen, since no nitrogen dioxide is provided in this state, which prolongs the regeneration time and leads to large carbon monoxide emissions

[0027] At the same time, catalytic converters for the oxidation of nitrogen monoxide are less stable than catalytic converters for the oxidation of hydrocarbons with regard to thermal damage, since at temperatures above 550° C. the active components are irreversibly sintered and thus lead to a reduction in the activity of nitrogen oxides

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