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Ignition/misfire detector for an internal combustion engine

  • US 4,567,755 A
  • Filed: 02/28/1984
  • Issued: 02/04/1986
  • Est. Priority Date: 03/03/1983
  • Status: Expired due to Fees
First Claim
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1. A device for the detection of ignition/misfire in an internal combustion engine comprising:

  • pressure detection means for detecting changes in the combustion pressure in said engine and producing an output indicative thereof,timing detection means for calculating a reference angular position of the rotation of said engine, andignition/misfire decision means for deciding the occurrence of ignition/misfire of said engine, said ignition/misfire decision means comprising;

    (a) positive value comparison means for comparing said output of said pressure detection means with a pedetermined positive reference voltage,(b) negative value comparison means for comparing said output of said pressure detection means with a predetermined negative reference voltage,(c) first counting means for measuring the period from the generation of and output of said positive value comparison means to the generation of an output of said negative value comparison means and producing an output indicative of said measuring,(d) second counting means for measuring the period which is twice the period from the generation of said output of said positive value comparison means to the generation of an output reference signal from said timing detection means and producing an output indicative of said measuring, and(e) comparison means for comparing said output of said first counting means and said output of said second counting means.

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