System and Method for Desulfating a NOx Trap

摘要

In an apparatus having an internal combustion engine and a catalytic device for treating NO_x emissions from the internal combustion engine, a method of operating the engine comprising operating the engine for a first interval in such a manner as to store and reduce NO_x emissions in the catalytic device thereby accumulating stored sulfur in the catalytic device, and operating the engine for a second interval in such a manner as to remove a portion of the stored sulfur from the catalytic device and to leave a substantial portion of stored sulfur in the catalytic device.