Institut Francais Du Pe'trole

Peugeot Citroen Automobiles Sa

Rémi Noirot

Jean-Baptiste Dementhon

Michel Castagne

Sébastien Gindre

A method is intended for desulfation of a nitric oxide trap () and regeneration of a particle filter () arranged in an exhaust line () for treating exhaust gas from an internal-combustion engine (), notably a Diesel engine. The saturation rate of the trap and the clogging rate of the filter are evaluated and, as soon as one of the rates reaches a threshold value, the fuel/air ratio of the exhaust gas is increased without it reaching a fuel/air ratio of 1, then desulfation of trap () is performed in association with regeneration of particle filter ().

Method and device intended for desulfation of a nitric oxide trap and regeneration of a particle filter

The invention relates to a method for regenerating a particle filter () integrated into an exhaust line () of an internal combustion engine (), wherein the exhaust gas flows into the filter via an inflow surface () and exit the filter via an outflow surface (). According to the invention, the internal temperature of at least two regions of the filter () is monitored during regeneration of the filter; the oxygen content of the exhaust gas is reduced if at least one of the monitored temperatures rises above a critical temperature; the oxygen content of the exhaust gas is increased in order to continue regeneration if all of the monitored temperatures are below said critical temperature.

Method and device for regenerating a particle filter integrated into an exhaust line of an internal combustion engine

Process for the decontamination of the emissions from an internal combustion engine (), the exhaust line () of which is equipped with a particle filter (), characterized in that an NOtrap additive is added to the fuel, so that the said additive is found trapped within the soot, and in that, at the time of the regenerations of the particle filter (), the engine () is controlled with a richness balance according to at least one alternation of a lean-mixture phase and of a rich-mixture phase, in order to bring about the adsorption of the NOfrom the exhaust gases by the said additive during the lean-mixture phase or phases and to bring about the oxidation of the soot particles by the adsorbed NOduring the rich-mixture phase or phases. Device for the implementation of this process.

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Garchizy, France

Rémi Noirot