Process for determining fuel quantity
First Claim
1. A process for determining a fuel quantity to be fed into an internal combustion engine during each intake stroke, comprising the steps of:
- (a) determining an air intake cross-section and an angular velocity of a crank shaft for a current stroke;
(b) determining a current intake-pipe pressure associated with predetermined operating conditions based on the air intake cross-section and angular velocity;
(c) determining a time constant for a change in the intake-pipe pressure based on the air intake cross-section and the angular velocity of the crank shaft;
(d) determining a projected intake-pipe pressure for a next stroke based on the current intake-pipe pressure associated with predetermined operating conditions, and the time constant for the change in intake-pipe pressure;
(e) determining an air mass sucked into the air intake for an intake stroke based upon the projected intake pipe pressure for the next stroke; and
(f) determining the fuel quantity to be fed to each cylinder for the next stroke based on the air mass determinations made in step (e) and a wall film model.
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Abstract
In order to determine the fuel quantity to be fed into an internal combustion engine during each stroke of the engine, the air mass sucked into each cylinder for combustion during each intake stroke is determined based on an intake-pipe pressure. A current air mass is determined using a measured value for the intake-pipe pressure. Subsequently, during a period in which there is no change in an air intake cross-section for each cylinder, the air mass is determined using a projected intake-pipe pressure, and the fuel quantity to be fed to each cylinder during the current and subsequent intake strokes is determined based on the air mass determinations and a wall film model.
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Citations
12 Claims
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1. A process for determining a fuel quantity to be fed into an internal combustion engine during each intake stroke, comprising the steps of:
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(a) determining an air intake cross-section and an angular velocity of a crank shaft for a current stroke; (b) determining a current intake-pipe pressure associated with predetermined operating conditions based on the air intake cross-section and angular velocity; (c) determining a time constant for a change in the intake-pipe pressure based on the air intake cross-section and the angular velocity of the crank shaft; (d) determining a projected intake-pipe pressure for a next stroke based on the current intake-pipe pressure associated with predetermined operating conditions, and the time constant for the change in intake-pipe pressure; (e) determining an air mass sucked into the air intake for an intake stroke based upon the projected intake pipe pressure for the next stroke; and (f) determining the fuel quantity to be fed to each cylinder for the next stroke based on the air mass determinations made in step (e) and a wall film model. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for determining a fuel quantity to be fed into an internal combustion engine during each intake stroke, comprising the steps of:
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a. measuring a present intake pipe pressure, for a present intake stroke, for each cylinder; b. predicting, during a period when there is no change in an air intake cross-section for each cylinder, a subsequent intake pipe pressure, for a subsequent intake stroke, for each cylinder based upon at least the present intake pipe pressure for each cylinder; c. determining, for each cylinder, an air mass sucked therein for the subsequent intake stroke based upon the predicted subsequent intake pipe pressure for each cylinder; and d. determining a fuel quantity to be fed to each cylinder during the subsequent intake stroke based upon the air mass determinations of step c. - View Dependent Claims (9, 10)
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11. A process for determining a fuel quantity to be fed into an internal combustion engine during each intake stroke, comprising the steps of:
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a. measuring a present intake pipe pressure, for a present intake stroke, for each cylinder; b. predicting, during a period when there is no change in an air intake cross-section for each cylinder, a subsequent intake pipe pressure, for a subsequent intake stroke, for each cylinder based upon at least the present intake pipe pressure for each cylinder; c. determining, for each cylinder, a subsequent air mass sucked therein for the subsequent intake stroke based upon the predicted subsequent intake pipe pressure for each cylinder; d. determining a temperature of a present air mass sucked into each cylinder; e. determining an air mass correction value based upon the temperature of the present air mass; f. correcting, for each cylinder, the subsequent air mass determined in step c based upon the air mass correction value; and d. determining a fuel quantity to be fed to each cylinder during the subsequent intake stroke based upon the corrected subsequent air mass determinations of step f and a wall film model. - View Dependent Claims (12)
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Specification