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Method for detecting crankshaft oscillations

  • US 5,747,678 A
  • Filed: 11/08/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 11/08/1994
  • Status: Expired due to Term
First Claim
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1. A method for detecting oscillations of a crankshaft of an internal combustion engine, which comprises:

  • determining if an engine is within a predetermined rpm range;

    ascertaining an amplitude of a crankshaft vibration if the engine is within the predetermined rpm range;

    determining if the amplitude is greater than a limit value;

    ascertaining a frequency of the crankshaft vibration if the amplitude is greater than the limit value;

    determining if the frequency is within a predetermined frequency range; and

    ascertaining an oscillation of the crankshaft and suppressing for a predeterminable period of time a process for detecting combustion misfires by evaluating fluctuations in the crankshaft speed, if the frequency is within the predetermined frequency range.

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