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Apparatus for estimating intake air amount

  • US 4,974,563 A
  • Filed: 05/19/1989
  • Issued: 12/04/1990
  • Est. Priority Date: 05/23/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for estimating an intake air amount in an intake pipe of an engine having at least one cylinder connected to a the intake pipe for conducting air into the cylinder and a surge supressor located in the intake pipe at a first point upstream of the cylinder, said estimating apparatus comprising:

  • means for detecting an amount (Q) of air flowing into the intake pipe from the atmosphere, the air-flow detecting means being located at a second point in the intake pipe upstream of the first point such that the surge suppressor is disposed between the cylinder and the air-flow detecting means;

    means for detecting a rotation speed (ω

    ) of the engine;

    means for estimating an amount {mc(k+1)} of air conducted into the cylinder, using the following equation based on a physical model that takes the surge suppressor into account and that is based on the law of conservation of mass encompassing the air-flow amount (Q), the rotation speed (ω

    ) and the intake air amount {mc(k)};

    
    
    space="preserve" listing-type="equation">mc(k+1)=α

    ·

    Q/ω



    ·

    mc(k) where α and

    β

    are constants determined by the law of conservation of mass and mc(k) is a prior estimate of the amount of air entering the engine cylinder; and

    means for controlling at least one engine operating parameter based on the estimated intake air amount.

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