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Apparatus and method for engine idle speed control

  • US 4,794,898 A
  • Filed: 02/29/1988
  • Issued: 01/03/1989
  • Est. Priority Date: 08/08/1983
  • Status: Expired due to Term
First Claim
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1. An engine idle speed control apparatus for use with an engine driven generator of an automobile having at a least a field coil, comprising:

  • (a) switching means for controlling current flowing through said field coil of said generator;

    (b) first means for detecting first data which is a function of conduction rate of said switching means;

    (c) second means for detecting second data which is a function of the rotational speed of said engine or said generator;

    (d) computing means responsive to the detected first data received from said first means and responsive to the detected second data received from said second means for;

    deriving a reference which is determined as a function of a desired conduction rate of said switching means, corresponding to said second data, from said computing means;

    comparing said detected first data with the reference;

    producing a control signal in accordance with the results of the comparison; and

    (e) idle speed control means responsive to said control signal for controlling the rotational speed of said engine, so that the detected first data approaches the reference.

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