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Ignition timing retard angle control apparatus for internal combustion engine

  • US 4,495,918 A
  • Filed: 11/28/1980
  • Issued: 01/29/1985
  • Est. Priority Date: 11/30/1979
  • Status: Expired due to Term
First Claim
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1. An ignition retard angle control for use in an internal combustion engine, comprising:

  • first means for detecting vibrations of the engine to produce an output in the form of an electrical signal;

    second means for discriminating part of the output signal of said first means in a characteristic frequency range in which a knock-induced vibration component appears remarkably when a knock is generated;

    third means for amplifying an output signal of said second means at a first amplification degree;

    fourth means for rectifying the output signal of said second means;

    fifth means for averaging out an output signal of said fourth means;

    sixth means for amplifying an output signal of said fifth means at a second amplification degree, said first and second amplification degrees being determined in such a manner that the peak of the instantaneous values of the amplitude of the output signal of said third means exceeds the instantaneous value of the amplitude of the output signal of said sixth means only in the presence of a knock;

    seventh means for comparing the output signals of said third and sixth means with each other to produce a knock signal showing the presence of a knock when the instantaneous value of the output signal of said third means exceeds that of the output signal of said sixth means; and

    eighth means for generating a voltage signal having an amplitude corresponding to an ignition advance angle determined by the number of revolutions per unit time of the engine, the amplitude of said voltage signal being changed in a manner to retard the ignition advance angle by a predetermined amount in response to the generation of the knock signal.

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