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System and method for controlling a fuel supply to an internal combustion engine

  • US 4,896,644 A
  • Filed: 01/29/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 01/30/1987
  • Status: Expired due to Term
First Claim
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1. A system for controlling a fuel supply to an internal combustion engine, comprising:

  • (a) first means for monitoring engine operating conditions;

    (b) second means for determining whether the engine presently falls in a predetermined deceleration condition on the basis of the engine operating conditions monitored by the first means and cutting the fuel supply off when it is determined that the engine presently falls in the predetermined deceleration condition;

    (c) third means for calculating a basic fuel quantity to be supplied to the engine on the basis of the engine operating conditions detected by the first means and correcting the basic fuel quantity according to a fuel recovery increment quantity when the fuel supply recovery is started after the fuel supply cut-off is carried out by the second means so as to derive a final fuel quantity supplied to the engine;

    (d) fourth means for deriving an engine load immediately before the fuel supply cut-off is carried out from the engine operating conditions detected by the first means;

    (e) fifth means for counting a first duration of time during which the fuel supply cut-off is carried out;

    (f) sixth means for deriving a residual quantity of the supplied fuel remaining on a wall of an intake air passage of the engine at a time immediately before the fuel supply cut-off is started on the basis of the engine load immediately before the engine fuel cut-off is carried out derived by the fourth means;

    (g) seventh means for deriving and setting the the fuel recovery increment quantity on the basis of the residual fuel quantity and the first duration of time counted by the fifth means; and

    (g) eighth means for supplying the final fuel quantity derived by the third means to the engine.

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