US 2003/0170577 A1Published application

Method and device for treating diesel exhaust gas

AssigneeDaimlerChrysler AG

InventorsTillmann Braun, Oliver Ebelsheiser, Bernd Krutzsch, Klaus-Juergen Marquardt, Michel Weibel, Guenter Wenninger

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Abstract

In a method for burning deposited soot particles in a particle filter on an exhaust device of a diesel engine, first of all, in a known way, a catalytic converter produces NO2 from exhaust gas. This NO2 reduces the ignition temperature of soot to such an extent that it burns at normal exhaust-gas temperature. Furthermore, there is provision to add fuel additive, which likewise allows the ignition temperature of the soot to be reduced. The sulphur content in the fuel is determined, and either generation of NO2 or the addition of additive is used as a function of this measurement. This preferably takes place automatically. To determine the sulphur content, it is possible, for example, to use a sulphur sensor in the tank.

Claims24

Dependent claims

A method for removing particles, which have been deposited on a filter arranged in an exhaust system of an internal combustion engine which is operated with fuel, by combustion, comprising:

determining a sulphur content in the fuel, passing NO-containing exhaust gas over a catalytic converter upstream of the filter in order to convert the NO in the exhaust gas into NO2, and then using NO2-containing exhaust gas to burn the particles which have been deposited on the filter when the sulphur content is lower than a predetermined sulphur content, the quantity of NO which has been converted into NO2 being sufficient to enable the combustion of the particles to be carried out at a temperature of less than 400° C., and
adding an additive which contains a metal salt of an organic compound to the fuel in order to reduce the ignition temperature of the particles which have been deposited on the filter to below the normal ignition temperature of the particles when the sulphur content is higher than the predetermined sulphur content.

Dependencies are inferred from the claim text.

Facts

Application: 10/361,008Filed 10 Feb 2003
Priority: DE 102 05 380.49 Feb 2002
Published: 11 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F01N 9/002
Electrical control of exhaust gas treating apparatus: of filter regeneration
F01N 3/0231
Using means for regenerating the filters, e.g. by burning trapped particles: using special exhaust apparatus upstream of the filter for producing…
F01N 3/029
Using means for regenerating the filters, e.g. by burning trapped particles: by adding non-fuel substances to exhaust
F01N 3/035
In combination with other devices: with catalytic reactors