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Fuel injection amount control apparatus and method of internal combustion

  • US 20040007211A1
  • Filed: 07/08/2003
  • Published: 01/15/2004
  • Est. Priority Date: 07/10/2002
  • Status: Active Grant
First Claim
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1. A fuel injection amount control apparatus of an internal combustion engine, comprising:

  • a predicted in-cylinder intake air amount calculating unit that predicts an operating state quantity of the engine to be established at a point of time ahead of a current point of time, and calculates a predicted in-cylinder intake air amount that is an amount of intake air drawn into a particular cylinder of the engine during a particular intake stroke, based on the predicted engine operating state quantity, at a point of time before completion of the particular intake stroke of the particular cylinder;

    a basic fuel injection amount calculating unit that calculates a basic fuel injection amount for achieving a target air/fuel ratio, based on the predicted in-cylinder intake air amount calculated by the predicted in-cylinder intake air amount calculating unit and the target air/fuel ratio;

    an actual in-cylinder intake air amount calculating unit that calculates an actual in-cylinder intake air amount at a point of time after the engine operating state quantity used by the predicted in-cylinder intake air amount calculating unit for calculating the predicted in-cylinder intake air amount with respect to an intake stroke one cycle before the particular intake stroke of the particular cylinder is confirmed, the actual in-cylinder intake air amount calculating unit calculating, as the actual in-cylinder intake air amount, an amount of intake air drawn into the particular cylinder during the intake stroke one cycle before the particular intake stroke, based on the confirmed actual operating state quantity;

    a feedforward correction amount calculating unit that calculates a feedforward correction amount based on the predicted in-cylinder intake air amount for the intake stroke one cycle before the particular intake stroke and the actual in-cylinder intake air amount for the intake stroke one cycle before the particular intake stroke, the feedforward correction amount being determined so as to compensate for an excess or a shortage of the basic fuel injection amount for the intake stroke one cycle before the particular intake stroke, which excess or shortage is caused by a difference between the predicted in-cylinder intake air amount for the intake stroke one cycle before the particular intake stroke and the actual in-cylinder intake air amount for the intake stroke one cycle before the particular intake stroke;

    a feedforward fuel injection amount calculating unit that calculates a feedforward fuel injection amount by correcting the basic fuel injection amount for the particular intake stroke of the particular cylinder by using the feedforward correction amount;

    an air/fuel ratio sensor that detects an air/fuel ratio of an exhaust gas of the engine;

    a feedback correction amount calculating unit that calculates a feedback correction amount for reducing a deviation between the air/fuel ratio detected by the air/fuel ratio sensor and an air/fuel ratio of an air-fuel mixture corresponding to the exhaust gas whose air/fuel ratio is detected by the air/fuel ratio sensor, based on the air/fuel ratio of the air-fuel mixture and the detected air/fuel ratio, the air/fuel ratio of the air-fuel mixture being determined based on the feedforward fuel injection amount calculated by the feedforward fuel injection amount calculating unit with respect to a past intake stroke of the particular cylinder during which the air-fuel mixture was introduced into the cylinder;

    a final fuel injection amount calculating unit that calculates a final fuel injection amount by correcting the feedforward fuel injection amount calculated with respect to the particular intake stroke of the particular cylinder, by using the feedback correction amount; and

    a fuel injector that injects a fuel having the final fuel injection amount into the particular cylinder during the particular intake stroke.

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