US5908463A
Expired / Lapsed
US
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Fuel metering control system for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1995-12-29
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Granted: 1999-06-01
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Expires: 2015-12-29
Abstract
Abstract A fuel metering control system for an internal combustion engine having a plurality of cylinders. The system includes an air/fuel ratio sensor and engine operating condition detecting means for detecting engine operating conditions such as engine speed and engine load. The basic quantity of fuel injection is determined by retrieving mapped data according to the detected parameters. A plurality of controllers are provided all using outputs of the air/fuel ratio sensor. The controllers are configured to receive the sensor outputs through filters having different cutout frequency so as to avoid control interference therebetween.
Inventors
- 👤 Shusuke Akazaki
- 👤 Yusuke Hasegawa
- 👤 Isao Komoriya
- 👤 Hidetaka Maki
- 👤 Yoichi Nishimura
- 👤 Toshiaki Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:50
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/02; F02D41/14; F02D41/1401; F02D41/1402; F02D41/1438; F02D41/1473; F02D2041/1409; F02D2041/1413; F02D2041/1415; F02D2041/1416; F02D2041/1417; F02D2041/1418; F02D2041/142; F02D2041/1426; F02D2041/1433; F02D41/1444; F02D41/1454; F02D41/1456
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
187 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; feedback loops having a plurality of controllers each inputs an output of said air/fuel ratio sensor as a controlled variable and operates to determine feedback correction coefficient, that changes a manipulated variable corresponding to the quantity of fuel injection, such that the controlled variable is brought to a desired value; and a fuel injector for injecting fuel in the individual cylinders of the engine in response to the manipulated variable; wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another.
Claim 2
Independent Claim
187 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; feedback loops having a plurality of controllers each inputs an output of said air/fuel ratio sensor as a controlled variable and operates to determine feedback correction coefficient, that changes a manipulated variable corresponding to the quantity of fuel injection, such that the controlled variable is brought to a desired value; and a fuel injector for injecting fuel in the individual cylinders of the engine in response to the manipulated variable; wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another.
Claim 3
Dependent Claim
94 words
A system according to claim 1, further including individual cylinder air/fuel ratio estimating means comprising: a model describing a behavior of the exhaust system of the engine and inputting an output of said air/fuel ratio sensor; observing means for observing an internal state of the exhaust system described by said model; and estimating means for estimating air/fuel ratios of the individual cylinders based on an output of said observing means; wherein at least one of the controllers calculates the feedback correction coefficient for individual cylinders of the engine based on the estimated air/fuel ratios.
Claim 4
Dependent Claim
17 words
A system according to claim 2, wherein at least one of the filters is a low-pass filter.
Claim 5
Dependent Claim
46 words
A system according to claim 1, wherein at least one of the controllers is a controller based upon a control law expressed in a recursion formula and calculates the feedback correction coefficient using the controlled variable and the manipulated variable in accordance with the recursion formula.
Claim 6
Dependent Claim
17 words
A system according to claim 1, wherein at least one of the filters is a low-pass filter.
Claim 7
Dependent Claim
155 words
A system according to claim 1, further including: individual cylinder air/fuel ratio estimating means comprising: a model describing a behavior of the exhaust system of the engine and inputting an output of said air/fuel ratio sensor through a first one of the plurality of filters; observing means for observing an internal state of the exhaust system described by said model; and estimating means for estimating air/fuel ratios of the individual cylinders based on an output of said observing means; and said plurality of controllers includes a first controller that calculates feedback correction coefficient for individual cylinders of the engine based on the estimated air/fuel ratios, and a second controller uses a control law expressed in a recursion formula and calculates a feedback correction coefficient using an input of the air/fuel ratio sensor through a second one of the plurality of filters as the controlled variable and the manipulated variable in accordance with the recursion formula.
Claim 8
Dependent Claim
16 words
A system according to claim 6, wherein the first and the second filters are low-pass filters.
Claim 9
Dependent Claim
25 words
A system according to claim 7, wherein the low-pass filter of the second filter has a cutout frequency less than that of the first filter.
Claim 10
Dependent Claim
45 words
A system according to claim 1, wherein at least one of the controllers is a controller using a control law expressed in a recursion formula and calculates the feedback correction coefficient using the controlled variable and the manipulated variable in accordance with the recursion formula.
Claim 11
Dependent Claim
17 words
A system according to claim 9, wherein at least one of the filters is a low-pass filter.
Claim 12
Dependent Claim
17 words
A system according to claim 6, wherein at least one of the filters is a low-pass filter.
Claim 13
Independent Claim
183 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; fuel correcting means having a plurality of controllers each inputs an output of said air/fuel ratio sensor in order to determine fuel correction coefficients based upon the detected air/fuel ratio output by the air/fuel ratio sensor, and to correct the quantity of fuel injection; and a fuel injector for injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection; wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another.
Claim 14
Independent Claim
183 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; fuel correcting means having a plurality of controllers each inputs an output of said air/fuel ratio sensor in order to determine fuel correction coefficients based upon the detected air/fuel ratio output by the air/fuel ratio sensor, and to correct the quantity of fuel injection; and a fuel injector for injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection; wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another.
Claim 15
Dependent Claim
107 words
A system according to claim 12, wherein one of the controllers includes an estimating means for estimating air/fuel ratios of individual cylinders from an exhaust gas system behavior describing means which describes a behavior of the exhaust gas system, said exhaust gas system behavior describing means including a model means describing the behavior of the exhaust system of the engine and an observer means which observes an internal state of the exhaust system described by said model means, and at least one of the controllers calculates the fuel correction coefficient for individual cylinders of the engine based upon the estimated air/fuel ratios estimated by the estimating means.
Claim 16
Dependent Claim
53 words
A system according to claim 12, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and calculates the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 17
Dependent Claim
17 words
A system according to claim 12, wherein at least one of the filters is a low-pass filter.
Claim 18
Dependent Claim
161 words
A system according to claim 12, wherein said plurality of controllers includes a first controller for calculating a first fuel correction coefficient for individual cylinders of the engine based upon an estimated air/fuel ratio derived from an exhaust gas system behavior describing means which describes the behavior of the exhaust gas system, said exhaust gas system behavior describing means includes a model means describing a behavior of the exhaust system of the engine and inputting the output of the air/fuel ratio sensor through a first sensor and an observer means for observing an internal state of the exhaust system described by said model means; and said plurality of controllers includes a second controller which adaptively determines a second fuel correction coefficient using an input of the air/fuel ratio sensor through a second filter such that the detected air/fuel ratio is brought to a desired air/fuel ratio, wherein said second controller is based upon a control law expressed as a recursion formula.
Claim 19
Dependent Claim
15 words
A system according to claim 16, wherein said first and second filters are low-pass filters.
Claim 20
Dependent Claim
25 words
A system according to claim 17, wherein the low-pass filter of the second filter has a cutout frequency less than that of the first filter.
Claim 21
Dependent Claim
17 words
A system according to claim 17, wherein at least one of the filters is a low-pass filter.
Claim 22
Dependent Claim
17 words
A system according to claim 16, wherein at least one of the filters is a low-pass filter.
Claim 23
Dependent Claim
53 words
A system according to claim 13, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and calculates the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 24
Dependent Claim
17 words
A system according to claim 21, wherein at least one of the filters is a low-pass filter.
Claim 25
Independent Claim
210 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an engine air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; control means for controlling fuel injected into the engine based upon outputs from the air/fuel ratio sensor and the engine operating condition detecting means, said control means including a) fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; and b) fuel correcting means having a plurality of controllers that input an output of said air/fuel ratio sensor to determine fuel correction coefficients based upon the output of the air/fuel ratio sensor, and to correct the quantity of fuel injection, wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another; and a fuel injector for injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection.
Claim 26
Independent Claim
210 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: an engine air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; control means for controlling fuel injected into the engine based upon outputs from the air/fuel ratio sensor and the engine operating condition detecting means, said control means including a) fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; and b) fuel correcting means having a plurality of controllers that input an output of said air/fuel ratio sensor to determine fuel correction coefficients based upon the output of the air/fuel ratio sensor, and to correct the quantity of fuel injection, wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another; and a fuel injector for injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection.
Claim 27
Dependent Claim
95 words
A system according to claim 23, wherein one of the controllers includes an estimating means for estimating air/fuel ratios of individual cylinders from an exhaust gas system behavior describing means which describes a behavior of the exhaust gas system, said exhaust gas system behavior describing means including a model means describing the behavior of the exhaust system of the engine and an observer means which observes an internal state of the exhaust system described by said model means, and at least one of the controllers calculates the fuel correction coefficient based upon the air/fuel ratio.
Claim 28
Dependent Claim
17 words
A system according to claim 24, wherein at least one of the filters is a low-pass filter.
Claim 29
Dependent Claim
50 words
A system according to claim 23, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and-calculates the fuel correction coefficient using the output of the air/fuel ratio sensor quantity of fuel injection in accordance with the recursion formula.
Claim 30
Dependent Claim
17 words
A system according to claim 26, wherein at least one of the filters is a low-pass filter.
Claim 31
Dependent Claim
17 words
A system according to claim 23, wherein at least one of the filters is a low-pass filter.
Claim 32
Dependent Claim
166 words
A system according to claim 23, wherein said plurality of controllers includes a first controller for estimating a first fuel correction coefficient for individual cylinders of the engine based upon an estimated air/fuel ratio derived from an exhaust gas system behavior describing means which describes the behavior of the exhaust gas system, said exhaust gas system behavior describing means includes a model means describing behavior of the exhaust system of the engine while inputting the air/fuel ratio at a confluence point through a first one of the filters and an observer means for observing an internal state of the exhaust system described by said model means; and said plurality of controllers includes a second controller which adaptively determines a second fuel correction coefficient using an input of the air/fuel ratio sensor through a second one of the filters such that the detected air/fuel ratio is brought to a desired air/fuel ratio, wherein said second controller is based upon a control law expressed as a recursion formula.
Claim 33
Dependent Claim
15 words
A system according to claim 29, wherein said first and second filters are low-pass filters.
Claim 34
Dependent Claim
25 words
A system according to claim 30, wherein the low-pass filter of the second filter has a cutout frequency less than that of the first filter.
Claim 35
Dependent Claim
53 words
A system according to claim 25, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and calculates the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 36
Dependent Claim
17 words
A system according to claim 32, wherein at least one of the filters is a low-pass filter.
Claim 37
Independent Claim
174 words
A method for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising the steps of: detecting an air/fuel ratio of the engine by an air/fuel ratio sensor installed at an exhaust system of the engine; detecting engine operating conditions including at least engine speed and engine load; determining the quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; determining a plurality of fuel correction coefficients based upon the output of the air/fuel ratio sensor; and correct the quantity of fuel injection, said plurality of fuel correction coefficients being determined with a plurality of controllers in a feedback manner such that the air/fuel ratio is brought to a desired value, wherein the output of the air/fuel ratio sensor is input to at least one of the controllers through at least one of a plurality of filters whose cutout frequency characteristics are different from one another; and injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection.
Claim 38
Independent Claim
174 words
A method for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising the steps of: detecting an air/fuel ratio of the engine by an air/fuel ratio sensor installed at an exhaust system of the engine; detecting engine operating conditions including at least engine speed and engine load; determining the quantity of fuel injection for individual cylinders based on at least the detected engine operating conditions; determining a plurality of fuel correction coefficients based upon the output of the air/fuel ratio sensor; and correct the quantity of fuel injection, said plurality of fuel correction coefficients being determined with a plurality of controllers in a feedback manner such that the air/fuel ratio is brought to a desired value, wherein the output of the air/fuel ratio sensor is input to at least one of the controllers through at least one of a plurality of filters whose cutout frequency characteristics are different from one another; and injecting fuel in the individual cylinders of the engine based upon the corrected quantity of fuel injection.
Claim 39
Dependent Claim
78 words
A method according to claim 34, further including the step of estimating the air/fuel ratios of individual cylinders from an exhaust gas system behavior describing means which describes a behavior of the exhaust gas system and includes the step of describing the behavior of the exhaust gas system of the engine and observing the internal state of the exhaust system, and calculating the fuel correction coefficient for individual cylinders of the engine based upon the estimated air/fuel ratio.
Claim 40
Dependent Claim
45 words
A method according to claim 34, including the step of using a control law expressed in a recursion formula and calculating the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 41
Dependent Claim
21 words
A method according to claim 36, including the step of using a low-pass filter for at least one of the filters.
Claim 42
Dependent Claim
22 words
A method according to claim 37, further comprising the step of using a low-pass filter for at least one of the filters.
Claim 43
Dependent Claim
127 words
A method according to claim 37, including estimating a first fuel correction coefficient for individual cylinders of the engine based upon an estimated air/fuel ratio derived from an exhaust gas system behavior describing means which describes a behavior of the exhaust gas system and includes the step of describing the behavior of the exhaust system of the engine while inputting the output of the air/fuel ratio through a first filter and observing an internal state of the exhaust system; and adaptively determining a second fuel correction coefficient using an input of the air/fuel ratio sensor through a second filter such that the detected air/fuel ratio is brought to the desired air/fuel ratio, wherein the adaptive correction is based upon a control law expressed as a recursion formula.
Claim 44
Dependent Claim
19 words
A method according to claim 39, including the step of using low-pass filters for said first and second filters.
Claim 45
Dependent Claim
31 words
A method according to claim 40, includes the step of having a cut out frequency of the low-pass filter of the second filter being less than that of the first filter.
Claim 46
Dependent Claim
46 words
A method according to claim 34, including the step of using a control law expressed in a recursion formula and calculating the fuel correction coefficient using the output of the air/fuel ratio sensor for correcting the quantity of fuel injection in accordance with the recursion formula.
Claim 47
Dependent Claim
21 words
A method according to claim 42, including a step of using at least one of the filters as a low-pass filter.
Claim 48
Dependent Claim
18 words
A method according to claim 34, including using a low-pass filter for at least one of the filters.
Claim 49
Dependent Claim
132 words
A computer system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least detected engine operating conditions; fuel correcting means having a plurality of controllers which input an output of an air/fuel ratio sensor and which determine fuel correction coefficients, said fuel correcting means for correcting the quantity of fuel injection, wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another, wherein fuel injected in the individual cylinders of the engine are based upon the corrected quantity of fuel injection.
Claim 50
Dependent Claim
132 words
A computer system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, comprising: fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders based on at least detected engine operating conditions; fuel correcting means having a plurality of controllers which input an output of an air/fuel ratio sensor and which determine fuel correction coefficients, said fuel correcting means for correcting the quantity of fuel injection, wherein at least one of the controllers is input with the output of the air/fuel ratio sensor through at least one of a plurality of filters, said filters having cutout frequency characteristics which are different from one another, wherein fuel injected in the individual cylinders of the engine are based upon the corrected quantity of fuel injection.
Claim 51
Dependent Claim
108 words
A computer system according to claim 45, wherein one of the controllers includes an estimating means for estimating the air/fuel ratios of individual cylinders from an exhaust gas system behavior describing means which describes behavior of the exhaust gas system, said exhaust gas system behavior describing means including a model means describing the behavior of the exhaust system of the engine and an observer means which observes an internal state of the exhaust system described by said model means, and at least one of the controllers calculates the fuel correction coefficient for individual cylinders of the engine based upon the estimated air/fuel ratio estimated by the estimating means.
Claim 52
Dependent Claim
18 words
A computer system according to claim 46, wherein at least one of the filters is a low-pass filter.
Claim 53
Dependent Claim
54 words
A computer system according to claim 49, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and calculates the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 54
Dependent Claim
18 words
A computer system according to claim 48, wherein at least one of the filters is a low-pass filter.
Claim 55
Dependent Claim
18 words
A computer system according to claim 45, wherein at least one of the filters is a low-pass filter.
Claim 56
Dependent Claim
162 words
A computer system according to claim 45, wherein said plurality of controllers includes a first controller for estimating a first fuel correction coefficient for individual cylinders of the engine based upon an estimated air/fuel ratio derived from an exhaust gas system behavior describing means which describes a behavior of the exhaust gas system, said exhaust gas system behavior describing means includes a model means describing the behavior of the exhaust system of the engine while inputting an output of an air/fuel ratio sensor through a first filter and an observer means for observing an internal state of the exhaust system described by said model means; and said plurality of controllers includes a second controller which adaptively determines a second fuel correction coefficient using an input of the air/fuel ratio sensor through a second filter such that the detected air/fuel ratio is brought to a desired air/fuel ratio, wherein said second controller is based upon a control law expressed as a recursion formula.
Claim 57
Dependent Claim
16 words
A computer system according to claim 51, wherein said first and second filters are low-pass filters.
Claim 58
Dependent Claim
26 words
A computer system according to claim 52, wherein the low-pass filter of the second filter has a cutout frequency less than that of the first filter.
Claim 59
Dependent Claim
54 words
A computer system according to claim 45, wherein at least one of the controllers is an adaptive controller based upon a control law expressed in a recursion formula and calculates the fuel correction coefficient using the output of the air/fuel ratio sensor and the quantity of fuel injection in accordance with the recursion formula.
Claim 60
Dependent Claim
18 words
A computer system according to claim 54, wherein at least one of the filters is a low-pass filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |