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Exhaust-gas cleaning device for engine

  • US 20020119080A1
  • Filed: 02/25/2002
  • Published: 08/29/2002
  • Est. Priority Date: 02/27/2001
  • Status: Active Grant
First Claim
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1. An exhaust-gas cleaning device for an engine, said exhaust-gas cleaning device comprising:

  • an HC-adsorbing catalytic converter disposed in an exhaust passage, the HC-adsorbing catalytic converter including;

    an HC-adsorbing material which adsorbs HC contained in exhaust gas and releases adsorbed HC as temperature increases;

    an oxygen storage material which occludes oxygen when the concentration of oxygen in the exhaust gas is high and releases occluded oxygen as the oxygen concentration drops; and

    an oxidizing catalytic metal which oxidizes HC released from the HC-adsorbing material; and

    an oxygen concentration controller which controls the oxygen concentration in the exhaust gas on the upstream side of the HC-adsorbing catalytic converter in such a manner that oxygen is released from the oxygen storage material when the engine is in an operating condition in which HC is released from the HC-adsorbing material.

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