SYSTEM AND METHOD FOR REGENERATING A DEVICE FOR CATALYTICALLY TRAPPING OXIDES OF NITROGEN

摘要

The system for regenerating a device for catalytically trapping oxides of nitrogen positioned in the exhaust line of an internal combustion engine of the diesel type, particularly belonging to a motor vehicle, comprises first means (15) of determining the mass of nitrogen oxides eliminated during a phase of eliminating the nitrogen oxides from the catalytic trap device and second means (16) of determining the mass of nitrogen oxides present in the catalytic trap device when said phase of eliminating the nitrogen oxides is initiated. The system further comprises control means (17) capable of determining when to initiate the next phase of eliminating oxides of sulphur as a function of values of a criterion dependent on said mass of nitrogen oxides eliminated and on said mass of nitrogen oxides present.