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Knock detecting device

  • US 4,354,378 A
  • Filed: 04/18/1980
  • Issued: 10/19/1982
  • Est. Priority Date: 04/21/1979
  • Status: Expired due to Term
First Claim
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1. A knock detecting device for a multiple cylinder engine, comprising:

  • a sensor for detecting vibrations of the body of the engine and producing output signals indicative thereof;

    a plurality of averaging circuits, each of said averaging circuits corresponding to a separate one of said cylinders;

    a first switch means for distributing output signals from said sensor developed in association with individual cylinders to said corresponding averaging circuits in synchronism with ignitions of said individual cylinders;

    a second switch means for selecting output signals from said corresponding averaging circuits in synchronism with said ignitions thereby providing individual corresponding reference signals for each of said cylinders; and

    a detecting means for detecting a knocking state of each of said cylinders in dependence on said corresponding reference signal for each cylinder.

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