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Engine misfire detection

  • US 7,292,933 B2
  • Filed: 11/01/2005
  • Issued: 11/06/2007
  • Est. Priority Date: 11/15/2004
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a malfunction of an engine, the engine having a rotating member and an angular position correlated with an angular orientation of the rotating member, the engine having an engine speed, the method comprising:

  • determining the engine speed at a plurality of angular positions;

    multiplying the engine speed by a sine function of the angular position to provide a first product;

    passing the first product through a first low pass filter to produce a first output; and

    detecting the malfunction of the engine using the first output.

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