Method and device to monitor the desulphurization of NOx storage catalytic converters

摘要

This method desulphurises the NOx absorption catalyst (3) of an engine (1) exhaust system. When this becomes necessary, the exhaust temperature is raised, to a level adequate for desulphurisation, which lies below a maximum predetermined temperature limit. Desulphurisation occurs with the engine running rich. On completion, normal engine operation is resumed. Equipment to carry out the process is also claimed. There are temperature sensors (T1,T2), measuring the exhaust gas temperature, situated immediately upstream and downstream the storage catalyst.