Exhaust emission control system having a nitrogen oxide adsorber and method for desulfating the nitrogen oxide adsorber
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United States of America Patent
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Jan 18, 2005
Grant Date -
Oct 17, 2002
app pub date -
May 5, 2000
filing date -
May 5, 1999
priority date (Note) -
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Abstract
An exhaust emission control system having a nitrogen oxide adsorber and a desulfating device, and a method for desulfating a nitrogen oxide absorber are disclosed. The desulfating device is managed so as to establish an oscillatingly rich and lean exhaust gas composition during a respective desulfating operation, and contains an oxygen accumulator downstream from the nitrogen oxide adsorber. The nitrogen oxide adsorber is effectively desulfated by way of a corresponding desulfating method, and released sulfur compounds are thereby simultaneously oxidized. The exhaust emission control systems can be utilized, for example, with a motor vehicle internal combustion engine.
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