Method for desulfating an NOx accumulator catalytic converter
AssigneeVolkswagen Aktiengesellschaft
InventorEkkehard Pott
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Abstract
An NOx accumulator catalytic converter for an internal combustion engine is desulfonated by providing a plurality of intermittent rich/lean operating cycles of the engine wherein rich operation is at a lambda of less than 0.985, and wherein the duration of rich mixture operation is limited to reduce hydrogen sulfide emission.
Claims12
A method for desulfating an NOx accumulator catalytic converter in the exhaust of an internal combustion engine operated with a normal lean mixture comprising operating said catalytic converter at a predetermined desulfating temperature and intermittently operating said engine with a rich mixture having a lambda value of less than 0.985 and said lean mixture for a plurality of rich/lean cycles, said rich mixture operation having a duration selected to be short so that emission of hydrogen sulfide is reduced.
Dependencies are inferred from the claim text.