US 5,003,950 AGranted

Apparatus for control and intake air amount prediction in an internal combustion engine

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsSenji Kato, Hidehiro Oba

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Abstract

An apparatus to calculate the intake pipe pressure using the degree of throttle opening and the engine speed, to use this intake pipe pressure to calculate a current intake pipe pressure, and to determine a predicted value from this current intake pipe pressure and control fuel injection duration and/or spark timing. Because changes in the atmospheric pressure and changes in the air amount flowing through a bypass bypassing the throttle, etc., cause errors in the values predicted for the intake pipe pressure, there are irregularities in the exhaust emissions. The atmospheric pressure and the intake pipe pressure, etc., detected by a pressure sensor are used to correct the predicted value, and prevent irregularities and the like in exhaust emissions.

Claims24

Dependent claims

An internal combustion engine control apparatus, comprising:

a first detection means for detecting a degree of throttle opening;
a second detection means for detecting an engine speed;
measurement means for measuring a value of one of an amount of intake air taken into the combustion chamber and a physical quantity corresponding to the intake air amount;
prediction means which calculates an intake pipe pressure for a constant state, on the basis of a current degree of throttle opening and a current engine speed, and uses said intake pipe pressure and a constant status to predict a value for a future point in time a certain period in advance of a current time, of one of the amount of intake air taken into the combustion chamber and a physical quantity corresponding to the intake air amount;
a correction means for using the value measured by said measurement means to correct the value predicted by said prediction means;
and
a control means for controlling one or both of the fuel injection duration and the spark timing, on the basis of the corrected predicted value and the engine speed.

4 more elements

An internal combustion engine intake air amount prediction apparatus, comprising:

a first detection means for detecting a degree of throttle opening;
a second detection means for detecting an engine speed;
a measurement means for measuring a value of one of an amount of intake air taken into the combustion chamber and a physical quantity corresponding to the intake air amount;
a first calculation means which uses a current degree of throttle opening and a current engine speed as the basis for calculating an intake pipe pressure for a constant status, and uses said intake pipe pressure for the constant status to calculate a value of one of the amount of intake air taken into the combustion chamber and a physical quantity corresponding to this intake air amount for a current time,
a prediction means for predicting a value of one of the amount of intake air taken into the combustion chamber and a physical quantity corresponding to the intake air amount for a future point in time a certain period in advance of said current time,
a second calculation means that uses the value measured by said measurement means and the difference between said value at a current time and said predicted value, or that uses the predicted value and the difference between said value for a current time and the value measured by said measurement means, as the basis for predicting one of an amount of intake air, or a physical quantity corresponding to the intake air amount.

3 more elements

Dependencies are inferred from the claim text.