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Idling speed control system of an internal combustion engine

  • US 4,611,560 A
  • Filed: 12/07/1984
  • Issued: 09/16/1986
  • Est. Priority Date: 04/08/1983
  • Status: Expired due to Term
First Claim
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1. An idling speed control system of an internal combustion engine comprising:

  • a valve device which controls the amount of intake air for the engine;

    an actuator which includes an electric motor for variably controlling the opening of said valve device;

    rotation speed detector means for detecting the rotation speed of the engine;

    idling condition detector means for detecting the idling condition of the engine;

    feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so that said detected rotation speed of the engine under the idling condition may converge into a target idling rotation speed; and

    control means responsive to the output of detector means that detects an abnormally low rotation speed of the engine detected by said rotation speed detector means for generating control pulses that do not overlap said feedback control pulses to drive said electric motor in a predetermined direction.

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