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Apparatus and method for controlling ignition timing for internal combustion engine

  • US 4,799,469 A
  • Filed: 01/05/1987
  • Issued: 01/24/1989
  • Est. Priority Date: 01/08/1986
  • Status: Expired due to Term
First Claim
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1. A method for controlling ignition timing comprising the steps of:

  • determining a fundamental ignition timing amount based on an engine operating condition;

    determining a direction of change in an engine speed which indicates whether the speed is increasing or decreasing;

    determining a correction ignition timing amount based on the direction of change in the engine speed, said correction ignition timing amount having a value which is substantially ineffective at an engine speed in the vicinity of a point at which the direction of change of the engine speed is inverted and is a maximum value at a time point at which the changing rate of the engine speed is maximum; and

    determining ignition timing by adding or subtracting said correction ignition timing amount to or from said fundamental ignition timing amount.

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