Abstract: The invention relates to a device and method for determining the need for regeneration in a NOx storage catalyst (18) arranged in the exhaust train (12) of an at least periodically lean-operating internal combustion engine (10) for a motor vehicle. According to the invention, the need for regeneration is determined according to the engine power (P) of the internal combustion engine (10) and the remaining NOx storage capacity of the NOx storage catalyst.

Abstract: The invention relates to a method and device for controlling the NOx regeneration of a NOx storage catalyst (14) disposed in the exhaust gas train (12) of an internal combustion engine (10) of a motor vehicle. The NOx regeneration is at least initiated when a threshold value is exceeded for a load state of a NOx storage catalyst (14) or a NOx emission downstream from the NOx storage catalyst (14). According to the invention, it is detected (a) whether the internal combustion engine (10) is idling and (b) alternately or in any possible combination, the threshold value for the load state or the NOx emission is increased; the NOx regeneration is only initiated after a specific amount of time has elapsed and a current NOx regeneration is interrupted when a shift occurs into an idling mode.

Abstract: The invention relates to a method for controlling a NOx storage catalyst by means of a NOx-sensitive measuring device, especially a NOx sensor, that is arranged downstream in relation to the NOx storage catalyst which is arranged in an exhaust gas channel of a combustion engine. According to the invention, a reference time (t0) is determined by means of a signal path of the NOx-sensitive measuring device (18) after the combustion engine (10) has been switched into a lean operating mode. Said reference time is used as the timely starting point for controlling processes being related to the NOx storage catalyst (16). The invention also relates to a device for carrying out the method.

Abstract: The invention relates to a device and method for determining the need for regeneration in a NOx storage catalyst (18) arranged in the exhaust train (12) of an at least periodically lean-operating internal combustion engine (10) for a motor vehicle. According to the invention, the need for regeneration is determined according to the engine power (P) of the internal combustion engine (10) and the remaining NOx storage capacity of the NOx storage catalyst.

Abstract: The invention relates to a method for controlling a NOx storage catalyst by means of a NOx-sensitive measuring device, especially a NOx sensor, that is arranged downstream in relation to the NOx storage catalyst which is arranged in an exhaust gas channel of a combustion engine. According to the invention, a reference time (to) is determined by means of a signal path of the NOx-sensitive measuring device (18) after the combustion engine (10) has been switched into a lean operating mode. Said reference time is used as the timely starting point for controlling processes being related to the NOx storage catalyst (16). The invention also relates to a device for carrying out the method.