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Method of controlling fuel supply to engine by prediction calculation

  • US 4,987,888 A
  • Filed: 04/05/1988
  • Issued: 01/29/1991
  • Est. Priority Date: 04/08/1987
  • Status: Expired due to Term
First Claim
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1. A method for determining control variables of an engine of an automobile on the basis of engine operating parameters and a target air-fuel ratio, said method comprising the steps of:

  • (a) measuring a plurality of parameters representing engine operating conditions including an intake air flow at the present state of the engine;

    (b) estimating a plurality of unmeasured parameters representing engine operating conditions at the present state of the engine on the basis of said measured parameters;

    (c) predicting engine operating conditions at a coming state of the engine on the basis of the measured parameters and the estimated parameters;

    (d) determining control variables at the coming state of the engine on the basis of the predicted engine operating conditions; and

    (e) said estimating step including a step for estimating said unmeasured parameters on the basis of difference values between the measured parameters and the corresponding estimated parameters.

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