Apparatus for purifying and controlling exhaust gases
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United States of America Patent
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app pub date -
Nov 21, 2001
filing date -
Aug 6, 1999
priority date (Note) -
Abandoned
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Abstract
A system having an NO.sub.x adsorption catalyst in an exhaust gas flow channel of the internal combustion engine, and adsorbing and capturing NO.sub.x in an oxidative atmosphere of an exhaust gas during lean burn running and then producing a reductive atmosphere thereby regenerating the adsorption catalyst, wherein a reduction treatment of NO.sub.x is carried out based on an estimated NO.sub.x purification rate and the NO.sub.x purification rate in the lean burn exhaust gas of the internal combustion engine is always maintained at or about a predetermined level thereby decreasing the amount of exhaust gas discharged.
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