Method for determining regeneration parameter values ​​of a multi-LNT catalyst system and device for data processing

Abstract

Method for determining regeneration parameter values ​​of a multiple LNT catalyst system with at least two LNT catalysts arranged in series (LNT1, LNT2, ..., LNT n ) and for regeneration by means of the action of reducing species on the nitrogen oxides stored in the LNT catalysts (LNT1, LNT2, ..., LNT n ), comprising the following steps: - Setting initial values ​​for regeneration parameters of each LNT catalyst (LNT1, LNT2, ..., LNT n ), - Determining an aging function (AF1, AF2, ..., AF) n ) for each LNT catalyst (LNT1, LNT2, ..., LNT n ), - Determining updated values ​​of the regeneration parameters by applying the aging functions (AF1, AF2, ..., AF1). n) on the initial values ​​of the regeneration parameters, wherein the regeneration parameters are selected from a group comprising the target value of the combustion air ratio (CAR) and the duration of the regeneration, - Subsequent regeneration of the multi-LNT catalyst system with the determined updated values ​​of the regeneration parameters, whereby with increasing aging either the duration of the regeneration is shortened or the target value for the air-fuel ratio (AFR) during regeneration is reduced.