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Methods and apparatus for detecting misfires

  • US 7,801,671 B1
  • Filed: 09/04/2007
  • Issued: 09/21/2010
  • Est. Priority Date: 09/05/2006
  • Status: Active Grant
First Claim
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1. A method of identifying one or more misfires occurring in an internal combustion engine, the method including the steps of:

  • a. running the engine;

    b. measuring the pressure pulses from the exhaust of the engine;

    c. generating a waveform from the measured pressure pulses;

    d. dividing the waveform into segments, one for each cylinder of the engine, wherein each segment represents a pressure pulse;

    e. associating each waveform segment with the cylinder which generated the pressure pulse; and

    f. examining each waveform segment for features which indicate a misfire.

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