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Exhaust purifying apparatus and method for internal combustion engine

  • US 20010011455A1
  • Filed: 01/16/2001
  • Published: 08/09/2001
  • Est. Priority Date: 02/03/2000
  • Status: Active Grant
First Claim
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1. An exhaust purifying apparatus for an internal combustion engine, the exhaust purifying apparatus comprising:

  • a catalyst that purifies exhaust gas emitted from the internal combustion engine;

    a first passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said first passage including an accelerated cooling portion having a cross section that permits a first quantity of heat to be released from the exhaust gas in the first passage;

    a second passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said second passage having a cross section that permits a second quantity of heat that is smaller than said first quantity of heat to be released from the exhaust gas in the second passage; and

    a flow amount controller that controls amounts of exhaust gas flowing through the first passage and through the second passage, such that;

    (i) the amount of exhaust gas flowing through the first passage is made larger than the amount of exhaust gas flowing through the second passage when a temperature of exhaust gas emitted from the engine is to be lowered by a relatively large degree before the exhaust gas flows into the catalyst, and (ii) the amount of exhaust gas flowing through the second passage is made larger than the amount of exhaust gas flowing through the first passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively small degree before the exhaust gas flows into the catalyst.

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