| 摘要 |
The present invention relates to a method for the desulfurization of an NOx storage catalyst situated in an exhaust system of an internal combustion engine, whereby, for the desulfurization, the internal combustion engine is alternatingly operated in a lean mode at lambd>1 and a rich mode at lambd<1. During the desulfurization process, the present invention provides for the progress of the desulfurization being monitored, using a change in a parameter relating to intervals (In), whereby the interval (In) lasts from the beginning of an nth rich operating phase (Tf,n), until the measured value drops below a predetermined lambda threshold value (Sf) downstream from the NOx storage catalyst (16). Furthermore, the progress of the desulfurization is monitored, using a change in a lambda probe voltage (Un) downstream from the NOx storage catalyst (16), which is determined at the end of a predetermined interval at the beginning of an nth rich operating phase (Tf,n). |
