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Device for purifying exhaust gas of engine

  • US 6,014,859 A
  • Filed: 08/19/1998
  • Issued: 01/18/2000
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Term
First Claim
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1. A device for purifying the exhaust gas of an engine having an exhaust passage, the device comprising:

  • an exhaust gas purifying catalyst arranged in the exhaust passage;

    a start catalyst arranged in the exhaust passage upstream of the exhaust gas purifying catalyst;

    means for forming a gas including oxygen;

    means for forming a gas including a reducing agent;

    means for forming at least one of the gas including oxygen and the gas including the reducing agent from the exhaust gas of the engine;

    means for mixing the gas including oxygen and the gas including the reducing agent and feeding the gas mixture to the exhaust gas purifying catalyst without the gas mixture flowing into the start catalyst;

    judging means for judging whether the exhaust gas purifying catalyst is poisoned, wherein a reactivation of the exhaust gas purifying catalyst is performed when the exhaust gas is judged to be poisoned; and

    means for obtaining a cumulative fuel amount of the fuel fed to the engine during the usual engine operation, wherein the exhaust gas purifying catalyst is judged to be poisoned when the cumulative fuel amount is larger than a predetermined amount.

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