| 摘要 |
The invention relates to a method for operating a nitrogen oxide (NOx) storage catalytic converter (12') of an internal combustion engine (1), especially of a motor vehicle. Nitrogen oxides (NOx), which are generated by the engine (1), are stored in a first operating phase in the NOx storage catalytic converter (12') and, in a second operating phase, nitrogen oxides stored in the NOx storage catalytic converter (12') are discharged from the NOx storage catalytic converter (12'). The start of the second operating phase is determined based on a nitrogen oxide (NOx) fill level (mnosp) of the NOx storage catalytic converter (12') and the NOx fill level (mnosp) is modeled based on a nitrogen oxide (NOx) storing model (30). To be able to precisely and reliably determine the start and the end of the second operating phase, it is suggested that a first value of the nitrogen oxide (NOx) mass flow (msnonk_s) rearward of the NOx storage catalytic converter (12') is detected and the NOx storing model (30) is corrected in dependence upon the detected first value.
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