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Apparatus for controlling the number of enabled cylinders of an internal combustion engine upon deceleration

  • US 4,276,863 A
  • Filed: 04/30/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 05/12/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling the number of enabled cylinders of an internal combustion engine having a plurality of cylinders during deceleration, comprising:

  • (a) first means for producing a first signal indicative of the rotational speed of a crankshaft of said engine;

    (b) second means for producing a second signal indicative of deceleration of said engine;

    (c) a plurality of threshold detecting circuits having respective inputs and outputs, said inputs being connected to said first means for producing respective output signals responsive to said first signal at each of said outputs, the thresholds of said detecting circuits being arranged stepwise;

    (d) a plurality of switching means responsive to the output signals of said threshold detecting circuits for stepwise increasing the number of enabled cylinders as said engine decelerates;

    (e) third means responsive to said second signal for enabling the stepwise increase upon deceleration of said engine; and

    (f) means for varying the thresholds of said threshold detecting circuits in accordance with the engine temperature.

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