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Method and apparatus to determine the timing of cyclically repetitive events, particularly ignition instant for internal combustion engines

  • US 4,082,069 A
  • Filed: 02/24/1976
  • Issued: 04/04/1978
  • Est. Priority Date: 03/20/1975
  • Status: Expired due to Term
First Claim
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1. Method to determine the timing of the ignition instant with respect to cyclical operation of a movable part of an internal combustion engine, in dependence on engine speed, comprising the steps ofgenerating a sequence of pulses as a function of movement of, and synchronously with operation of the engine part;

  • generating a first reference pulse upon occurrence of a predetermined position of the engine part;

    determining a timing interval having a predetermined timing duration upon generation of the first reference pulse;

    generating a second reference pulse occurring after said first reference pulse, and after said timing interval;

    counting the pulses of the pulse sequence after termination of the timing pulse and until occurrence of said second reference pulse, and accumulating said count in a counter (16);

    decrementing the count in the counter until the count state of the counter (16) has reached a predetermined level;

    and generating an output signal when the count state of said counter has reached said predetermined level.

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