| 摘要 |
A procedure for operating an exhaust gas treatment device arranged in the exhaust gas area of a combustion engine, which requires for the catalytically supported conversion of the NOx emission of the combustion engine a reagent, whose dosage is determined by a dosage signal depending on a NOx actual value that is contained in the exhaust gas treatment device and that is measured by a NOx sensor, which is contained in the exhaust gas treatment device downstream after a catalyzer, as well as a device for implementing the procedure is suggested. The dosage singal is influenced by a correcting signal depending on a measure for the operating time of the exhaust gas treatment device in the sense of an increase of the dosage of the reagent. The strategy according to the invention allows the condsideration of a long-term drift of the NOx emissions of the combustion engine and/or of long-term drifts of individual drifts of the exhaust gas treatment device and ensures a preset minimum NOx conversion rate for the entire operating time of the exhaust gas treatment device.
|
