| 摘要 |
A method for operating a nitrogen oxide (NOx) storage catalytic converter ( 12' ) of an internal combustion engine ( 1 ) includes storing nitrogen oxides (NOx), which are generated by the engine ( 1 ), in a first operating phase in the NOx storage catalytic converter ( 12' ). 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, 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.
|
