Patent US5638801A successfully refreshed from Google Patents.
US5638801A
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Fuel metering control system for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1996-02-23
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Granted: 1997-06-17
•
Expires: 2016-02-23
Abstract
Abstract A system for controlling fuel metering for a multi-cylinder internal combustion engine. In the system, a feedback loop having an adaptive controller and an adaptation mechanism coupled to the adaptive controller for estimating controller parameters θ is provided. The adaptive controller calculates a feedback correction coefficient using internal variables including the controller parameters θ, to correct a quantity of fuel injection obtained by retrieving mapped data by engine speed and engine load, to bring a detected air/fuel ratio to a desired air/fuel ratio. The internal variables of the adaptive controller are set such that the feedback correction coefficient is 1.0 or thereabout, when the engine operation has shifted from an open-loop control region to the feedback control region.
Inventors
- 👤 Hidetaka Maki
- 👤 Shusuke Akazaki
- 👤 Yusuke Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:53
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/1402; F02D41/1438; F02D41/1473; F02D2041/1413; F02D2041/1415; F02D2041/1426; F02D2041/1433; F02D41/1444; F02D41/1454; F02D41/1456
Claims Analysis
Total Claims: 68
Claim 1
Independent Claim
304 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; basic fuel injection quantity determining means coupled to said engine operating condition detecting means, for determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said output fuel injection quantity determining means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means sets the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 2
Independent Claim
304 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; basic fuel injection quantity determining means coupled to said engine operating condition detecting means, for determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said output fuel injection quantity determining means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means sets the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 3
Dependent Claim
16 words
A system according to claim 1, wherein the internal variables are expressed in a recursion formula.
Claim 4
Dependent Claim
32 words
A system according to claim 1, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 5
Dependent Claim
16 words
A system according to claim 3, wherein the internal variables are expressed in a recursion formula.
Claim 6
Dependent Claim
27 words
A system according to claim 1, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 7
Dependent Claim
32 words
A system according to claim 5, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 8
Dependent Claim
16 words
A system according to claim 5, wherein the internal variables are expressed in a recursion formula.
Claim 9
Dependent Claim
24 words
A system according to claim 1, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 10
Dependent Claim
27 words
A system according to claim 8, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 11
Dependent Claim
32 words
A system according to claim 8, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 12
Dependent Claim
16 words
A system according to claim 8, wherein the internal variables are expressed in a recursion formula.
Claim 13
Dependent Claim
19 words
A system according to claim 1, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 14
Dependent Claim
24 words
A system according to claim 12, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 15
Dependent Claim
27 words
A system according to claim 12, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 16
Dependent Claim
32 words
A system according to claim 12, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 17
Dependent Claim
16 words
A system according to claim 12, wherein the internal variables are expressed in a recursion formula.
Claim 18
Dependent Claim
17 words
A system according to claim 1, wherein the internal variables include past values of the controller parameters.
Claim 19
Dependent Claim
19 words
A system according to claim 17, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 20
Dependent Claim
24 words
A system according to claim 17, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 21
Dependent Claim
27 words
A system according to claim 17, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 22
Dependent Claim
32 words
A system according to claim 17, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 23
Dependent Claim
16 words
A system according to claim 17, wherein the internal variables are expressed in a recursion formula.
Claim 24
Dependent Claim
25 words
A system according to claim 1, wherein the feedback correction coefficient is a predetermined value that is multiplied by the basic quantity of fuel injection.
Claim 25
Dependent Claim
17 words
A system according to claim 23, wherein the internal variables include past values of the controller parameters.
Claim 26
Dependent Claim
19 words
A system according to claim 23, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 27
Dependent Claim
24 words
A system according to claim 23, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 28
Dependent Claim
32 words
A system according to claim 23, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 29
Dependent Claim
16 words
A system according to claim 23, wherein the internal variables are expressed in a recursion formula.
Claim 30
Dependent Claim
14 words
A system according to claim 23, wherein the predetermined value is 1.0 or thereabout.
Claim 31
Dependent Claim
17 words
A system according to claim 29, wherein the internal variables include past values of the controller parameters.
Claim 32
Dependent Claim
307 words
A computer program controlled system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; basic fuel injection quantity determining means coupled to said engine operating condition detecting means, for determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said output fuel injection quantity determining means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means sets the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 33
Dependent Claim
307 words
A computer program controlled system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; basic fuel injection quantity determining means coupled to said engine operating condition detecting means, for determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said output fuel injection quantity determining means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means sets the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 34
Dependent Claim
28 words
A computer program controlled system according to claim 31, wherein the feedback correction coefficient is a predetermined value that is multiplied by the basic quantity of fuel injection.
Claim 35
Dependent Claim
20 words
A computer program controlled system according to claim 31, wherein the internal variables include past values of the controller parameters.
Claim 36
Dependent Claim
22 words
A computer program controlled system according to claim 31, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 37
Dependent Claim
27 words
A computer program controlled system according to claim 31, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 38
Dependent Claim
30 words
A computer program controlled system according to claim 31, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 39
Dependent Claim
35 words
A computer program controlled system according to claim 31, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 40
Dependent Claim
19 words
A computer program controlled system according to claim 31, wherein the internal variables are expressed in a recursion formula.
Claim 41
Independent Claim
224 words
A method for controlling fuel metering for a multi-cylinder internal combustion engine, comprising the steps of: detecting an air/fuel ratio in exhaust gas of the engine; detecting engine operating conditions including at least engine speed and engine load; determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; feedback controlling with an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; determining an output quantity of fuel injection, while correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control regions; and injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: setting internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 42
Independent Claim
224 words
A method for controlling fuel metering for a multi-cylinder internal combustion engine, comprising the steps of: detecting an air/fuel ratio in exhaust gas of the engine; detecting engine operating conditions including at least engine speed and engine load; determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; feedback controlling with an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; determining an output quantity of fuel injection, while correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control regions; and injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: setting internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 43
Dependent Claim
25 words
A method according to claim 39, wherein the feedback correction coefficient is a predetermined value that is multiplied by the basic quantity of fuel injection.
Claim 44
Dependent Claim
17 words
A method according to claim 39, wherein the internal variables include past values of the controller parameters.
Claim 45
Dependent Claim
19 words
A method according to claim 39, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 46
Dependent Claim
24 words
A method according to claim 39, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 47
Dependent Claim
27 words
A method according to claim 39, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 48
Dependent Claim
29 words
A method according to claim 39, wherein the desired value is a desired air/fuel ratio, and the controller parameters are set based on at least the desired air/fuel ratio.
Claim 49
Dependent Claim
16 words
A method according to claim 39, wherein the internal variables are expressed in a recursion formula.
Claim 50
Dependent Claim
229 words
A computer program for controlling fuel metering for a multi-cylinder internal combustion engine, said computer program comprising the steps of: detecting an air/fuel ratio in exhaust gas of the engine; detecting engine operating conditions including at least engine speed and engine load; determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; feedback controlling with an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; determining an output quantity of fuel injection, while correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: setting the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 51
Dependent Claim
229 words
A computer program for controlling fuel metering for a multi-cylinder internal combustion engine, said computer program comprising the steps of: detecting an air/fuel ratio in exhaust gas of the engine; detecting engine operating conditions including at least engine speed and engine load; determining a basic quantity of fuel injection for a cylinder of the engine based on at least the detected engine operating conditions; feedback controlling with an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value; discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions; determining an output quantity of fuel injection, while correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: setting the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 52
Dependent Claim
26 words
A computer program according to claim 47, wherein the feedback correction coefficient is a predetermined value that is multiplied by the basic quantity of fuel injection.
Claim 53
Dependent Claim
15 words
A computer program according to claim 47, wherein the predetermined value is 1.0 or thereabout.
Claim 54
Dependent Claim
18 words
A computer program according to claim 47, wherein the internal variables include past values of the controller parameters.
Claim 55
Dependent Claim
20 words
A computer program according to claim 47, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 56
Dependent Claim
25 words
A computer program according to claim 47, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 57
Dependent Claim
28 words
A computer program according to claim 47, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 58
Dependent Claim
30 words
A computer program according to claim 47, wherein the desired value is a desired air/fuel ratio, and the controller parameters are set based on at least the desired air/fuel ratio.
Claim 59
Dependent Claim
17 words
A computer program according to claim 47, wherein the internal variables are expressed in a recursion formula.
Claim 60
Independent Claim
328 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; control means, coupled to said air/fuel ratio sensor and said engine operating condition detecting means, for controlling an amount of fuel to be injected into the engine, said controls means including: a) basic fuel injection quantity determining means for determining a basic quantity of fuel injection for a cylinder of the engine, based on at least the detected engine operating conditions, b) a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value, c) feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions, and d) output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said control means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means setting the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 61
Independent Claim
328 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising: an air/fuel ratio sensor located in an exhaust system of the engine for detecting an air/fuel ratio in exhaust gas of the engine; engine operating condition detecting means for detecting engine operating conditions including at least engine speed and engine load; control means, coupled to said air/fuel ratio sensor and said engine operating condition detecting means, for controlling an amount of fuel to be injected into the engine, said controls means including: a) basic fuel injection quantity determining means for determining a basic quantity of fuel injection for a cylinder of the engine, based on at least the detected engine operating conditions, b) a feedback loop means coupled to said basic fuel injection quantity determining means, and having an adaptive controller and an adaptation mechanism coupled to said adaptive controller for estimating controller parameters, said adaptive controller calculating a feedback correction coefficient using internal variables that include at least said controller parameters, to correct the basic quantity of fuel injection to bring a controlled variable obtained based at least on the detected air/fuel ratio to a desired value, c) feedback control region discriminating means for discriminating whether engine operation is in a feedback control region based on the detected engine operating conditions, and d) output fuel injection quantity determining means for determining an output quantity of fuel injection, said output fuel injection quantity determining means correcting the basic quantity of fuel injection using said feedback correction coefficient when the engine operation is discriminated to be in the feedback control region; and fuel injection means coupled to said control means, for injecting fuel into the cylinder of the engine based on the output quantity of fuel injection; wherein: said feedback loop means setting the internal variables of the adaptive controller such that the feedback correction coefficient is a predetermined value, when the engine operation has shifted from an open-loop control region to the feedback control region.
Claim 62
Dependent Claim
25 words
A system according to claim 56, wherein the feedback correction coefficient is a predetermined value that is multiplied by the basic quantity of fuel injection.
Claim 63
Dependent Claim
17 words
A system according to claim 56, wherein the internal variables include past values of the controller parameters.
Claim 64
Dependent Claim
19 words
A system according to claim 56, wherein the internal variables include a past value of the feedback correction coefficient.
Claim 65
Dependent Claim
24 words
A system according to claim 56, wherein the internal variables include a past value of an input, which is input to the adaptation mechanism.
Claim 66
Dependent Claim
27 words
A system according to claim 56, wherein the internal variables include a past value of a gain matrix that determines an estimation speed of the controller parameters.
Claim 67
Dependent Claim
32 words
A system according to claim 56, wherein the desired value is a desired air/fuel ratio, and said feedback loop means sets the controller parameters based on at least the desired air/fuel ratio.
Claim 68
Dependent Claim
16 words
A system according to claim 56, wherein the internal variables are expressed in a recursion formula.
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