| 摘要 |
A method for the desulfurization of an NO<SUB>x </SUB>storage catalyst arranged 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 lambda>1 and a rich mode at lambda<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 (I<SUB>n</SUB>), whereby the interval (I<SUB>n</SUB>) lasts from the beginning of an n<SUB>th </SUB>rich operating phase (T<SUB>f,n</SUB>), until the measured value drops below a predetermined lambda threshold value (S<SUB>f</SUB>) downstream from the NO<SUB>x </SUB>storage catalyst ( 16 ). Furthermore, the progress of the desulfurization is monitored, using a change in a lambda probe voltage (U<SUB>n</SUB>) downstream from the NO<SUB>x </SUB>storage catalyst ( 16 ), which is determined at the end of a predetermined interval at the beginning of an n<SUB>th </SUB>rich operating phase (T<SUB>f,n</SUB>). |
