Apparatus for purifying and controlling exhaust gases
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United States of America Patent
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Jun 29, 2004
Grant Date -
N/A
app pub date -
May 16, 2000
filing date -
Aug 9, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for purifying and controlling exhaust gases having NO.sub.x adsorption catalyst in the exhaust gas duct therein, and conducting exhaust gas purification by adsorbing or capturing NO.sub.x in the oxidative atmosphere of lean exhaust gas, producing a reductive atmosphere and regenerating the adsorption catalyst, characterized by carrying out a reduction treatment of NO.sub.x on the basis of a calculated quantity of adsorbed NO.sub.x, said calculated quantity of adsorbed NO.sub.x being obtained by subtracting the quantity of NO.sub.x directly reduced to N.sub.2 from the total NO.sub.x in exhaust gas, can maintain the NO.sub.x purification rate in the lean burn exhaust gas of internal combustion engine always at a prescribed level or above and thereby lowering the quantity of discharged harmful exhaust gas.
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