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Controller for internal combustion engine

  • US 20030010317A1
  • Filed: 07/16/2002
  • Published: 01/16/2003
  • Est. Priority Date: 07/16/2001
  • Status: Active Grant
First Claim
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1. A controller for an internal combustion engine, comprising:

  • lean correcting means for setting a lean correction value for correcting a fuel injection amount by decreasing the fuel injection amount during an operation after a cold start of an internal combustion engine and controlling an air-fuel ratio of the internal combustion engine to be leaner than a stoichiometric air-fuel ratio;

    engine speed fluctuation detecting means for detecting fluctuations in revolution speed of the internal combustion engine;

    correction amount calculating means for calculating a correction value for correcting the air-fuel ratio to the rich side on the basis of the engine speed fluctuation detected by the engine speed fluctuation detecting means;

    final correction value calculating means for calculating a final correction value of this time by selecting either a final correction value of last time or a correction value calculated by the correction amount calculating means as a correction value which suppresses the engine speed fluctuation more; and

    fuel injection amount correcting means for correcting the fuel injection amount on the basis of the lean correction value and the final correction value.

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