Patent ID: 6209317
Filing Date: 2001-04-03
Classification: B01D,F01N,F02D,F02M,Y02T

Abstract:
An exhaust gas purifying apparatus for an internal combustion engine comprising:a selective reduction type NO.sub.x catalyst disposed in an exhaust gas passageway of the internal combustion engine, said catalyst reduces or decomposes NOX in the presence of hydrocarbon in an ambient atmosphere with excessive oxygen;an absorbent which absorbs and desorbs a reductant provided in an upstream region of the selective reduction type NO.sub.x catalyst; andcatalyst temperature lowering suppression means for suppressing lowering of a temperature of the selective reduction type NO.sub.x catalyst when a load on the internal combustion engine is reduced, wherein:said catalyst temperature lowering suppression means is an exhaust gas flow rate limiting means for suppressing a flow rate of an exhaust gas which flows into the selective reduction type NO.sub.x catalyst.