Verfahren zur Erfassung einer Schädigung von wenigsens einem in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Speicherkatalysator

摘要

The invention relates to a method for detecting deterioration of at least one NOx storage catalyst arranged in the exhaust line of an internal combustion engine, whereby at least one exhaust gas constituent is detected by a gas sensor which is arranged downstream from said NOx storage catalyst and a signal corresponding to the content of said exhaust gas constituent is provided, whereupon a change in the operating mode of said internal combustion engine occurs, leading to at least one change in the lambda value with respect to the NOx storage catalyst, by at least temporarily influencing an operational parameter of the internal combustion engine. According to the invention, a) a signal trajectory of the at least one gas constituent is detected by the gas sensor during and after a change in the working mode of the internal combustion engine and b) the signal trajectory of the at least one gas constituent is compared with a predeterminable setpoint signal trajectory for the at least one gas constituent during at least one time period.