| 摘要 |
The invention relates to a method for desulphurating at least one NOx-storage catalyst that is arranged in an exhaust channel of a combustion engine. Desulphurisation is initiated after a given threshold value which represents a relation of the NOx-concentration upstream and downstream in relation to the NOx-storage catalyst according to the NOx-mass that is embedded in the NOx-storage catalyst. A minimum temperature is adjusted for the NOx-storage catalyst and a working mode of the combustion engine is adjusted with lambda </= 1 for the desulphurisation. At least one operational parameter of the combustion engine is at least temporarily influenced (measure) in order to obtain said working mode and/or said minimum temperature. According to the invention, at least a first operational parameter of the combustion engine (12) is adjusted when the threshold value is reached. Said parameter increases an exhaust temperature and guarantees for the working mode of the combustion engine (12) with lambda </= 1. At least one additional operational parameter of the combustion engine (12) is adjusted after a period of time has gone by and when the minimum temperature has not been reached. Said last parameter increases the exhaust temperature and guarantees for the working mode of the combustion engine (12) with lambda </= 1. |
