METHOD AND DEVICE FOR DESULFATING A NOx ACCUMULATOR CATALYST

摘要

The invention relates to a method for desulfating an NOx accumulator catalyst (4) in the exhaust gas system of an internal combustion engine (1) with direct injection. Said method comprises the following stages: Executing a retarded injection into the exhaust gas during the exhaust cycle of the internal combustion engine (1) in a desulfation mode and supplying an excess of oxygen to the exhaust gas in the desulfation mode, in such a way that post-combustion occurs in the NOx accumulator catalyst (4) to aid desulfation.