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Idle engine speed control apparatus

  • US 5,146,888 A
  • Filed: 06/21/1991
  • Issued: 09/15/1992
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Fees
First Claim
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1. An idle engine speed control apparatus for a multiple cylinder engine, comprising:

  • a throttle valve disposed in each intake manihold branch upstream of each cylinder of the engine;

    means defining an air passage connected with each intake manifold branch downstream of said throttle valve;

    an idle control valve disposed in each air passage, an opening state of said control valve being changeable to control an amount of air flowing in said air passage;

    means setting a target value of an idle engine speed;

    means for detecting a crankangle of the engine;

    means for calculating an engine speed in a combustion stroke of each cylinder of the engine in accordance with said detected crankangle; and

    means for feedback-controlling the opening state of said idle control valve so that the calculated engine speed is brought into agreement with said target value.

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