Abstract: A system for determining the level of sulphur poisoning of a depollution device integrated into the exhaust line of a motor vehicle engine involves controlling the operation thereof, switching the system between a lean storage mode and a rich storage mode, calculating the sulphur storage speed in the lean mode, calculating the sulphur elimination speed in the rich mode, calculating the quantity of sulphur stored in the depollution device during the operation of the engine and comparing the quantity of sulphur with threshold values for determining a poisoning level of the depollution device.

Abstract: The invention relates to a system for the removal of SOx (sulphur oxide) stored in a nitrogen oxide (NOx) trap associated with an oxidation catalyst and disposed in an exhaust line of an engine, said system including a stop module (54) capable of controlling the stopping a NOx trap purge task as a function of the SOx removal speed estimated by an estimator (60).

Abstract: The invention relates to a system for determining the level of sulphur poisoning of depollution means integrated into the exhaust line of a motor vehicle engine, said system being associated with means for controlling the operation thereof, for switching the system between a lean storage mode and a rich storage mode. The inventive system is characterised in that it comprises means (19) for calculating the sulphur storage speed in the lean mode, means (20) for calculating the sulphur elimination speed in the rich mode, means (21, 22) for calculating the quantity of sulphur stored in the depollution means during the operation of the engine and means for comparing (23) the quantity of sulphur with threshold values for determining a poisoning level of the depollution means.

Abstract: This system for the elimination of SOx (Sulphur Oxide) stored in a NOx (24) (Nitrogen Oxide) trap associated with an oxidation catalyst and placed upstream of a particle filter (26) in an exhaust line of a motor vehicle engine comprises a feed supervisor (32) able only to trigger the execution of an operation to flush out the NOx trap and cancel the execution of an operation to regenerate the particle filter, when the flushing out operation is to be performed immediately before or after the regeneration operation.