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Method for recognizing irregular combustions in a cylinder of an internal combustion engine

  • US 5,503,009 A
  • Filed: 12/29/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 12/03/1990
  • Status: Expired due to Fees
First Claim
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1. A method for recognizing irregular combustions in a cylinder of an internal-combustion engine, comprising the steps of:

  • obtaining two rotational speed measurements of a crankshaft for each cylinder of an internal combustion engine at two respective crankshaft positions in an acceleration phase, at least one of said two crankshaft positions being located after top dead center for the cylinder, said two speeds defining a speed curve;

    calculating a gradient of said speed curve from said two speeds, andrecognizing an irregular combustion when said speed gradient falls below a predetermined limit value;

    varying a distance of said crankshaft positions from one another and from top dead center depending upon load and on speed of the internal combustion engine.

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