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Engine control system and method for minimizing cylinder-to-cylinder speed variations

  • US 4,495,920 A
  • Filed: 04/07/1983
  • Issued: 01/29/1985
  • Est. Priority Date: 04/09/1982
  • Status: Expired due to Fees
First Claim
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1. A method for injecting fuel in an internal combustion engine having a plurality of cylinders, comprising the steps of:

  • (a) successively detecting the speed of said engine at predetermined angular positions of an output shaft of said engine which correspond to said cylinders respectively and generating therefrom a series of first signals representing individual engine speed values of said cylinders;

    (b) generating a basic injection control value representing the quantity of fuel to be injected in each of said cylinders as a function of said detected engine speed;

    (c) sensing for each of said cylinders when the detected engine speed is steady;

    (d) when said detected engine speed is steady, deriving a second signal representing an average value of said first signals during a predetermined period;

    (e) successively detecting a deviation of each of said first signals from said second signal;

    (f) generating a fuel injection trimming value for each of said cylinders in response to said deviation;

    (g) detecting whether said trimming value is smaller or greater than a predetermined value;

    (h) if said trimming value is smaller than said predetermined value, trimming said basic injection control value according to said trimming value;

    (i) if said trimming value is greater than said predetermined value, resetting said trimming value to zero; and

    (j) operating each of said fuel injectors in response to said trimmed basic injection control value.

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