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Internal combustion engine misfire detection with engine acceleration and deceleration correction during a repetitive misfire condition

  • US 6,023,651 A
  • Filed: 10/17/1997
  • Issued: 02/08/2000
  • Est. Priority Date: 10/17/1996
  • Status: Expired due to Term
First Claim
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1. A misfire detecting apparatus for an internal combustion engine, said apparatus comprising:

  • means for outputting a rotation signal indicative of an engine output shaft rotation;

    means for calculating rotational speed of said shaft based on said rotation signal in connection with cylinder firings;

    means for calculating an elementary term representing variation in said rotational speed between firings of two selected cylinders separated by a predetermined number of cylinder firings;

    means for calculating a correcting term by dividing a variation in rotational speed of said shaft for cylinder firings separated by a predetermined number of combustion cycles for one of the selected cylinders by an integer multiple of a total number of engine cylinders; and

    misfire detecting means for correcting the elementary term with the correcting term and for detecting a misfire of the internal combustion engine based on the thus corrected elementary term.

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