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Selection of velocity interval for power stroke acceleration measurements

  • US 5,056,360 A
  • Filed: 08/24/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 08/24/1990
  • Status: Expired due to Term
First Claim
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1. A method for determining crankshaft acceleration corresponding to individual power strokes of an internal combustion engine, said method comprising the steps of:

  • providing position signals at predetermined points of the rotation of said combustion engine, said points being at substantially regularly spaced rotation angles such that at least one position signal occurs during every power stroke;

    establishing one velocity measurement interval for each power stroke, each velocity measurement interval including between about 45° and

    180°

    of rotation of said crankshaft;

    measuring a time period during each respective velocity measurement interval; and

    calculating said acceleration corresponding to each individual power stroke as a function of the difference between the time period for each individual power stroke and the time period for the next successive power stroke;

    wherein each velocity measurement interval has a phase in relation to its respective power stroke such that a loss of power occurring in a particular power stroke causes a drop in the calculated acceleration corresponding to said particular power stroke and causes a smaller but substantially equal drop in the calculated accelerations corresponding to the power strokes immediately preceding and immediately following said particular power stroke.

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