US5590638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel metering control system for internal combustion engine
Assignee: Honda Motor Co Ltd
•
Filing: 1995-10-19
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Granted: 1997-01-07
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Expires: 2015-10-19
Abstract
Abstract A fuel metering control system for an internal combustion engine including feedback loop having an adaptive controller and an adaptation mechanism that estimates a controller parameters θ. The adaptive controller corrects the quantity of fuel injection to bring a controlled variable at least obtained based on an output of said air/fuel ratio sensor to a desired value. The adaptation mechanism is input with the controlled variable once per prescribed crank angle such as a TDC of a certain cylinder of a four-cylinder engine and estimates the controller parameters (vector) such that the adaptive controller is operated to synchronize with every 4 prescribed crank angle such as every TDC of all cylinders of the internal combustion engine, or with every prescribed crank angle such as every TDC. With the arrangement, the system enables adaptive control of a commercially practical internal combustion engine without degrading control performance.
Inventors
- 👤 Yoichi Nishimura
- 👤 Hidetaka Maki
- 👤 Yusuke Hasegawa
- 👤 Shusuke Akazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/02; F02D41/14; F02D41/1401; F02D41/1402; F02D41/1438; F02D41/1473; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2454; F02D2041/1409; F02D2041/1413; F02D2041/1415; F02D2041/1416; F02D2041/1417; F02D2041/1418; F02D2041/142; F02D2041/1426; F02D2041/1433; F02D2250/00; F02D2250/12; F02D41/1444; F02D41/1454; F02D41/1456; F02D41/2477; F02D41/2483
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
181 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller correcting the quantity of fuel injection Tim to bring a controlled variable y at least obtained based on an output of said air/fuel ratio sensor to a desired value u; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 2
Independent Claim
181 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller correcting the quantity of fuel injection Tim to bring a controlled variable y at least obtained based on an output of said air/fuel ratio sensor to a desired value u; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 3
Dependent Claim
48 words
A system according to claim 1, wherein said adaptation mechanism is input with an average of the controlled variables for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controlled variables.
Claim 4
Dependent Claim
49 words
A system according to claim 1, wherein said adaptation mechanism is input with an average of the controller parameters θ for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controller parameters.
Claim 5
Dependent Claim
30 words
A system according to claim 1, wherein said adaptation mechanism is input with the controlled variable synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 6
Dependent Claim
33 words
A system according to claim 2, wherein said adaptation mechanism is input with the average of the controlled variables synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 7
Dependent Claim
33 words
A system according to claim 3, wherein said adaptation mechanism is input with the average of the controller parameters synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 8
Dependent Claim
21 words
A system according to claim 1, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 9
Dependent Claim
21 words
A system according to claim 2, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 10
Dependent Claim
21 words
A system according to claim 3, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 11
Dependent Claim
14 words
A system according to claim 7, wherein said prescribed crank angle is a TDC.
Claim 12
Dependent Claim
14 words
A system according to claim 8, wherein said prescribed crank angle is a TDC.
Claim 13
Dependent Claim
14 words
A system according to claim 9, wherein said prescribed crank angle is a TDC.
Claim 14
Independent Claim
186 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller determining a correction coefficient KSTR for correcting the quantity of fuel injection Tim to bring a controlled variable KACT, obtained based on an output of said air/fuel ratio sensor, to a desired air/fuel ratio KCMD; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 15
Independent Claim
186 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller determining a correction coefficient KSTR for correcting the quantity of fuel injection Tim to bring a controlled variable KACT, obtained based on an output of said air/fuel ratio sensor, to a desired air/fuel ratio KCMD; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 16
Dependent Claim
48 words
A system according to claim 13, wherein said adaptation mechanism is input with an average of the controlled variables for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controlled variables.
Claim 17
Dependent Claim
49 words
A system according to claim 13, wherein said adaptation mechanism is input with an average of the controller parameters θ for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controller parameters.
Claim 18
Dependent Claim
30 words
A system according to claim 13, wherein said adaptation mechanism is input with the controlled variable synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 19
Dependent Claim
33 words
A system according to claim 14, wherein said adaptation mechanism is input with the average of the controlled variables synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 20
Dependent Claim
33 words
A system according to claim 15, wherein said adaptation mechanism is input with the average of the controller parameters synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 21
Dependent Claim
21 words
A system according to claim 16, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 22
Dependent Claim
21 words
A system according to claim 17, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 23
Dependent Claim
21 words
A system according to claim 18, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 24
Dependent Claim
14 words
A system according to claim 19, wherein said prescribed crank angle is a TDC.
Claim 25
Dependent Claim
14 words
A system according to claim 20, wherein said prescribed crank angle is a TDC.
Claim 26
Dependent Claim
14 words
A system according to claim 21, wherein said prescribed crank angle is a TDC.
Claim 27
Independent Claim
183 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller correcting the quantity of fuel injection Tim to bring a controlled variable of an estimated quantity of cylinder intake fuel Gfuel to a desired value of the quantity of fuel injection Tim; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 28
Independent Claim
183 words
A system for controlling fuel metering for a multi-cylinder internal combustion engine, including: an air/fuel ratio sensor installed at an exhaust system of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection Tim for individual cylinders at least based on the detected engine operating conditions; a fuel injector for injecting fuel in the individual cylinders of the engine in response to the determined quantity of fuel injection; and a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters θ, said adaptive controller correcting the quantity of fuel injection Tim to bring a controlled variable of an estimated quantity of cylinder intake fuel Gfuel to a desired value of the quantity of fuel injection Tim; wherein said fuel injection quantity determining means determines the quantity of fuel injection Tim at a predetermined crank angular cycle; and said adaptation mechanism is input with the controlled variable synchronously with a cycle longer than the predetermined crank angular cycle.
Claim 29
Dependent Claim
48 words
A system according to claim 25, wherein said adaptation mechanism is input with an averages of the controlled variables for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controlled variables.
Claim 30
Dependent Claim
49 words
A system according to claim 25, wherein said adaptation mechanism is input with an average of the controller parameters θ for the cycle longer than the predetermined crank angular cycle, and said adaptation mechanism estimates the controller parameters θ at least based on the average of the controller parameters.
Claim 31
Dependent Claim
30 words
A system according to claim 25, wherein said adaptation mechanism is input with the controlled variable synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 32
Dependent Claim
33 words
A system according to claim 26, wherein said adaptation mechanism is input with the average of the controlled variables synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 33
Dependent Claim
33 words
A system according to claim 27, wherein said adaptation mechanism is input with the average of the controller parameters synchronously with a prescribed crank angle of one of the cylinders of the engine.
Claim 34
Dependent Claim
21 words
A system according to claim 25, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 35
Dependent Claim
21 words
A system according to claim 26, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 36
Dependent Claim
21 words
A system according to claim 27, wherein said adaptive controller is operated synchronously with every prescribed crank angle of all cylinders.
Claim 37
Dependent Claim
14 words
A system according to claim 31, wherein said prescribed crank angle is a TDC.
Claim 38
Dependent Claim
14 words
A system according to claim 32, wherein said prescribed crank angle is a TDC.
Claim 39
Dependent Claim
14 words
A system according to claim 33, wherein said prescribed crank angle is a TDC.
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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) | 2000-01-07 | 2000-07-08 | 2001-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-07 | 2004-07-08 | 2005-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-07 | 2008-07-08 | 2009-01-07 | $7700.00 | Window Closed / Lapsed |