Fuel supply control system for internal combustion engine
First Claim
1. A fuel supply control system for an internal combustion engine, comprising:
- intake air flow rate detecting means for detecting an intake air flow rate of said engine;
basic fuel amount calculating means for calculating a basic fuel amount supplied to said engine according to the intake air flow rate detected by said intake air flow rate detecting means;
an air-fuel ratio detecting means for detecting an air-fuel ratio provided in an exhaust system of said engine;
air-fuel ratio correction coefficient calculating means for calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio detecting means coincides with a target air-fuel ratio;
correlation parameter calculating means for calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate detecting means, using a sequential statistical processing algorithm;
learning means for calculating a learning correction coefficient relating to a change in characteristics of said intake air flow rate detecting means, using the at least one correlation parameter vector; and
fuel amount control means for controlling an amount of fuel to be supplied to said engine using the basic fuel amount, the air-fuel ratio correction coefficient, and the learning correction coefficient.
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Accused Products
Abstract
A fuel supply control system for an internal combustion engine wherein a basic fuel amount supplied to said engine can be calculated according to the intake air flow rate detected by said intake air flow rate sensor. An air-fuel ratio correction coefficient can be calculated for correcting an amount of fuel to be supplied to the engine so that the detected air-fuel ratio coincides with a target air-fuel ratio. At least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by the intake air flow sensor, can be calculated using a sequential statistical processing algorithm. A learning correction coefficient relating to a change in characteristics of the intake air flow rate sensor can be calculated using the correlation parameter. An amount fuel to be supplied to the engine can be controlled using the basic fuel amount, the air-fuel ratio correction coefficient, and the learning correction coefficient.
10 Citations
27 Claims
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1. A fuel supply control system for an internal combustion engine, comprising:
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intake air flow rate detecting means for detecting an intake air flow rate of said engine;
basic fuel amount calculating means for calculating a basic fuel amount supplied to said engine according to the intake air flow rate detected by said intake air flow rate detecting means;
an air-fuel ratio detecting means for detecting an air-fuel ratio provided in an exhaust system of said engine;
air-fuel ratio correction coefficient calculating means for calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio detecting means coincides with a target air-fuel ratio;
correlation parameter calculating means for calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate detecting means, using a sequential statistical processing algorithm;
learning means for calculating a learning correction coefficient relating to a change in characteristics of said intake air flow rate detecting means, using the at least one correlation parameter vector; and
fuel amount control means for controlling an amount of fuel to be supplied to said engine using the basic fuel amount, the air-fuel ratio correction coefficient, and the learning correction coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel supply control system for an internal combustion engine, comprising:
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intake air flow rate detecting means for detecting an intake air flow rate of said engine;
basic fuel amount calculating means for calculating a basic fuel amount supplied to said engine, according to the intake air flow rate detected by said intake air flow rate detecting means;
an air-fuel ratio detecting means for detecting an air-fuel ratio provided in an exhaust system of said engine;
air-fuel ratio correction coefficient calculating means for calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio detecting means coincides with a target air-fuel ratio;
correlation parameter calculating means for calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate detecting means, using a sequential statistical processing algorithm;
fuel amount control means for controlling an amount of fuel to be supplied to said engine using the basic fuel amount and the air-fuel ratio correction coefficient; and
abnormality determining means for determining an abnormality in said intake air flow rate detecting means according to an element of the at least one correlation parameter vector.
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10. A fuel supply control method for an internal combustion engine, comprising the steps of:
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a) detecting an intake air flow rate of said engine by an intake air flow rate sensor;
b) calculating a basic fuel amount supplied to said engine, according to the intake air flow rate detected by said intake air flow rate sensor;
c) detecting an air-fuel ratio of an air-fuel mixture to be supplied to said engine, by an air-fuel ratio sensor provided in an exhaust system of said engine;
d) calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio sensor coincides with a target air-fuel ratio;
e) calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate sensor, using a sequential statistical processing algorithm;
f) calculating a learning correction coefficient relating to a change in characteristics of said intake air flow rate sensor using the at least one correlation parameter vector; and
g) controlling an amount of fuel to be supplied to said engine, using the basic fuel amount, the air-fuel ratio correction coefficient, and the learning correction coefficient. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A fuel supply control method for an internal combustion engine, comprising the steps of:
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a) detecting an intake air flow rate of said engine by an intake air flow rate sensor;
b) calculating a basic fuel amount supplied to said engine, according to the intake air flow rate detected by said intake air flow rate sensor;
c) detecting an air-fuel ratio of an air-fuel mixture to be supplied to said engine, by an air-fuel ratio sensor provided in an exhaust system of said engine;
d) calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio sensor coincides with a target air-fuel ratio;
e) calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate sensor, using a sequential statistical processing algorithm;
f) controlling an amount of fuel to be supplied to said engine using the basic fuel amount and the air-fuel ratio correction coefficient; and
g) determining an abnormality in said intake air flow rate sensor according to the at least one correlation parameter.
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19. A computer program embodied in a computer-readable medium causing a computer to carry out a fuel supply control method for an internal combustion engine, said fuel supply control method comprising the steps of:
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a) detecting an intake air flow rate of said engine by an intake air flow rate sensor;
b) calculating a basic fuel amount supplied to said engine, according to the intake air flow rate detected by said intake air flow rate sensor;
c) detecting an air-fuel ratio of an air-fuel mixture to be supplied to said engine, by an air-fuel ratio sensor provided in an exhaust system of said engine;
d) calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio sensor coincides with a target air-fuel ratio;
e) calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate sensor, using a sequential statistical processing algorithm;
f) calculating a learning correction coefficient relating to a change in characteristics of said intake air flow rate sensor, using the at least one correlation parameter vector; and
g) controlling an amount of fuel to be supplied to said engine using the basic fuel amount, the air-fuel ratio correction coefficient, and the learning correction coefficient. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A computer program embodied in a computer-readable medium causing a computer to carry out a fuel supply control method for an internal combustion engine, said fuel supply control method comprising the steps of:
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a) detecting an intake air flow rate of said engine by an intake air flow rate sensor;
b) calculating a basic fuel amount supplied to said engine, according to the intake air flow rate detected by said intake air flow rate sensor;
c) detecting an air-fuel ratio of an air-fuel mixture to be supplied to said engine, by an air-fuel ratio sensor provided in an exhaust system of said engine;
d) calculating an air-fuel ratio correction coefficient for correcting an amount of fuel to be supplied to said engine so that the air-fuel ratio detected by said air-fuel ratio sensor coincides with a target air-fuel ratio;
e) calculating at least one correlation parameter vector which defines a correlation between the air-fuel ratio correction coefficient and the intake air flow rate detected by said intake air flow rate sensor using a sequential statistical processing algorithm;
f) controlling an amount of fuel to be supplied to said engine using the basic fuel amount and the air-fuel ratio correction coefficient; and
g) determining an abnormality in said intake air flow rate sensor according to the at least one correlation parameter.
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Specification