Method and arrangement for carrying out a feedback flushing process in the case of an emission limit the direction of a motor vehicle

摘要

The present invention relates to a method and an arrangement (10) for the treatment of the exhaust gases of a vehicle, wherein the arrangement (10) an emission limiting before the direction (36) with at least one upstream block (46) and a downstream block (48) in each case for storing no φ × φ, wherein the block (48) arranged downstream is a lower nominal capacitance than the block (46) arranged upstream has. A between the upstream and downstream of which is located on board the blocks (46, 48) arranged oxygen sensor (42) generates an output signal, which the oxygen concentration in the emission limiting before the direction (36) represents. A motor control unit (14) transmits a rich operating state, in order in the emission limiting before the direction (36) of stored, no φ × φ flush out. The engine control unit (14) selects further comprising the rich operating state of the engine (12) for the no φ × φ - flushing into a function of the output signal of the oxygen sensor (42), in order to substantially all of the no φ × φ from the downstream block (48) of releasing. The de-selecting is preferably carried out after expiration of an additional time delay, which is calculated, in order to achieve a sufficient amount of excess hydrocarbons to make available.