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Device for knock detection in internal combustion engine

  • US 5,996,398 A
  • Filed: 08/13/1996
  • Issued: 12/07/1999
  • Est. Priority Date: 01/22/1992
  • Status: Expired due to Term
First Claim
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1. A device for detecting knocking in an internal combustion engine, comprising a knocking sensor for sensing knocking of said internal combustion engine and producing output signals;

  • filter devices for filtering the output signals of said knocking sensor;

    an evaluation facility for obtaining the filtered signals from said devices and evaluating said filtered signals;

    means for continuously determining at least one of a frequency and a phase of the output signals of said knock sensor, said evaluation facility evaluating a change of the frequency for the purpose of the knock detection; and

    means for controlling a center frequency of at least one of said filter devices depending on a crankshaft angle, said controlling means controlling the center frequency of said at least one of filter device within a combustion cycle of the internal combustion engine so that the center frequency of said at least one filter device reduces in response to an increase of the crankshaft angle.

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