Device and method for determining the need for regeneration in a nox storage catalyst
AssigneeVolkswagen Aktiengesellschaft
InventorsHermann Hahn, Michael Lindlau, Soren Hinze
Life of this patent
Estimating the term…
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.
Claims13
Method claim 1, characterized in that the engine power (P) is taken into consideration in form of an instantaneous engine power (Pm) of the internal combustion engine 10).
Method according to one of the preceding claims, characterized in that for the determination there is also taken into consideration an accelerator pedal position (αfp).
Method according to one of the preceding claims, characterized in that for the determination there is also taken into consideration a gear ratio (u) of a gear.
Method according to one of the preceding claims, characterized in that for the determination there is also taken into consideration a driving situation (FS) of the motor vehicle.
Method according to one of the preceding claims, characterized in that the engine power (P) is taken into consideration in form of a projected motor power gradient (δPp) during a predetermined time horizon (Tp).
Method according to one of the preceding claims, characterized in that the engine power (P) is taken into consideration in form of a projected motor power (Pp) at the end of the predetermined time horizon (Tp).
Method according to one of the preceding claims, characterized in that a parameter (KWR) is determined as a measure for the need for regeneration, wherein the parameter (KWR) increases with increasing engine power (Pm), increasing projected engine power (Pp) or increasing projected engine power gradient (δPp).
Method according to one of the preceding claims, characterized in that a parameter (KWR) is determined as a measure for the need for regeneration, wherein the parameter (KWR) increases with increasing acceleration gradient (δa) or with a more depressed accelerator pedal position (αfp).
Device for determining a need for regeneration of a NOx storage catalyst (18) which is arranged in an exhaust channel (12) of an at least temporarily lean-running combustion engine (10) for motor vehicles, characterized in that a control device (30) is provided in which a procedure for determining the need for regeneration as a function of an engine power (P) of the internal combustion engine (10) and a remaining NOx storage capacity of the NOx storage catalyst (18) is stored in digitized form.
Dependencies are inferred from the claim text.