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Control apparatus for internal combustion engine

  • US 5,479,897 A
  • Filed: 08/19/1994
  • Issued: 01/02/1996
  • Est. Priority Date: 08/20/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling an internal combustion engine, said apparatus comprising:

  • an electronic control unit for modelling behavior of said internal combustion engine based on a dynamic model of said behavior and for producing operating control signals based on said modelling;

    means for detecting a running state of said internal combustion engine and for providing running state signals representing said running state to said electronic control unit; and

    an actuator for controlling said running state of said internal combustion engine based on at least one of said control signals produced by said electronic control unit,wherein said electronic control unit comprises input means, output means, memory means and microprocessor means programmed to perform the steps of;

    (a) obtaining said running state signals from said running state detection means via said input means;

    (b) maintaining and outputting state variables based on present and past values of said running state signals and on present and past values of said produced operating control signals;

    (c) calculating, in realtime, model constants of said dynamic model on the basis of the value of a past operating control signal as well as on the values of present and past running state signals;

    (d) calculating an optimal feedback gain on the basis of said calculated model constants;

    (e) determining and accumulating a difference between a target running state signal and said obtained running state signals;

    (f) calculating a present operating control signal for said actuator on the basis of;

    said calculated optimal feedback gain, said accumulated difference value and said maintained state variables; and

    (g) providing to said actuator via said output means, said present operating control signal as said at least one control signal.

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