US5694910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling air-fuel ratio of internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1996-02-05
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Granted: 1997-12-09
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Expires: 2016-02-05
Abstract
Abstract An apparatus for controlling the air-fuel ratio of an internal combustion engine has an air-fuel ratio sensor for detecting an air-fuel ratio of the internal combustion engine, and a fuel supply control device for controlling an amount of fuel supplied to the internal combustion engine based on the air-fuel ratio detected by the air-fuel ratio sensor. The fuel supply control device has a feedback control system for controlling the amount of fuel supplied to the internal combustion engine through a feedback control loop according to a sliding mode control process in order to equalize the detected air-fuel ratio with a target air-fuel ratio.
Inventors
- 👤 Yusuke Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/1403; F02D41/1438; F02D41/1439; F02D41/1441; F02D41/1473; G; G05; G05B; G05B13/00; G05B13/02; G05B13/0205; G05B13/0255; F02D2041/1413; F02D2041/1415; F02D2041/1418; F02D2041/1426; F02D2041/1433
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
An apparatus for controlling the air-fuel ratio of an internal combustion engine, comprising: air-fuel ratio detecting means for detecting an air-fuel ratio of the internal combustion engine; and fuel supply control means for controlling an amount of fuel supplied to the internal combustion engine based on the air-fuel ratio detected by said air-fuel ratio detecting means, said fuel supply control means comprising feedback control means for controlling the amount of fuel supplied to the internal combustion engine through a feedback control loop according to a sliding mode control process in order to equalize the detected air-fuel ratio with a target air-fuel ratio, wherein a hyperplane of said sliding mode control process is set up at least by two state quantities depending on the detected air-fuel ratio and the target air-fuel ratio.
Claim 2
Independent Claim
131 words
An apparatus for controlling the air-fuel ratio of an internal combustion engine, comprising: air-fuel ratio detecting means for detecting an air-fuel ratio of the internal combustion engine; and fuel supply control means for controlling an amount of fuel supplied to the internal combustion engine based on the air-fuel ratio detected by said air-fuel ratio detecting means, said fuel supply control means comprising feedback control means for controlling the amount of fuel supplied to the internal combustion engine through a feedback control loop according to a sliding mode control process in order to equalize the detected air-fuel ratio with a target air-fuel ratio, wherein a hyperplane of said sliding mode control process is set up at least by two state quantities depending on the detected air-fuel ratio and the target air-fuel ratio.
Claim 3
Dependent Claim
104 words
An apparatus according to claim 1, wherein said fuel supply control means has means for determining an amount of fuel to be supplied to the internal combustion engine depending on at least a rotational speed and an intake air pressure of the internal combustion engine, and wherein said feedback control means has means for controlling the amount of fuel supplied to the internal combustion engine through the feedback control loop by correcting the amount of fuel to be supplied to the internal combustion engine according to the sliding mode control process in order to equalize the detected air-fuel ratio with said target air-fuel ratio.
Claim 4
Dependent Claim
43 words
An apparatus according to claim 1, further comprising a catalytic converter associated with an exhaust system of the internal combustion engine for purifying exhaust gases emitted from the internal combustion engine, said air-fuel ratio detecting means being positioned downstream of said catalytic converter.
Claim 5
Dependent Claim
26 words
An apparatus according to claim 1, wherein the two state quantities are determined by a difference between the detected air-fuel ratio and the target air-fuel ratio.
Claim 6
Independent Claim
257 words
An apparatus for controlling the air-fuel ratio of an internal combustion engine, comprising: air-fuel ratio detecting means for detecting an air-fuel ratio of the internal combustion engine; and fuel supply control means for controlling an amount of fuel supplied to the internal combustion engine based on the air-fuel ratio detected by said air-fuel ratio detecting means, said fuel supply control means comprising feedback control means for controlling the amount of fuel supplied to the internal combustion engine through a feedback control loop according to a sliding mode control process in order to equalize the detected air-fuel ratio with a target air-fuel ratio; a catalytic converter associated with an exhaust system of the internal combustion engine for purifying exhaust gases emitted from the internal combustion engine, said air-fuel ratio detecting means being positioned downstream of said catalytic converter; and second air-fuel ratio detecting means positioned upstream of said catalytic converter, wherein said feedback control means comprises first feedback control means for determining a target air-fuel ratio upstream of said catalytic converter according to the sliding mode control process depending on an air-fuel ratio detected by the air-fuel ratio detecting means positioned downstream of said catalytic converter, and second feedback control means for controlling the amount of fuel supplied to the internal combustion engine through the feedback control Iccp in order to equalize an air-fuel ratio detected by the second air-fuel ratio detecting means positioned upstream of said catalytic converter with the target air-fuel ratio upstream of said catalytic converter which is determined by said first feedback control means.
Claim 7
Independent Claim
257 words
An apparatus for controlling the air-fuel ratio of an internal combustion engine, comprising: air-fuel ratio detecting means for detecting an air-fuel ratio of the internal combustion engine; and fuel supply control means for controlling an amount of fuel supplied to the internal combustion engine based on the air-fuel ratio detected by said air-fuel ratio detecting means, said fuel supply control means comprising feedback control means for controlling the amount of fuel supplied to the internal combustion engine through a feedback control loop according to a sliding mode control process in order to equalize the detected air-fuel ratio with a target air-fuel ratio; a catalytic converter associated with an exhaust system of the internal combustion engine for purifying exhaust gases emitted from the internal combustion engine, said air-fuel ratio detecting means being positioned downstream of said catalytic converter; and second air-fuel ratio detecting means positioned upstream of said catalytic converter, wherein said feedback control means comprises first feedback control means for determining a target air-fuel ratio upstream of said catalytic converter according to the sliding mode control process depending on an air-fuel ratio detected by the air-fuel ratio detecting means positioned downstream of said catalytic converter, and second feedback control means for controlling the amount of fuel supplied to the internal combustion engine through the feedback control Iccp in order to equalize an air-fuel ratio detected by the second air-fuel ratio detecting means positioned upstream of said catalytic converter with the target air-fuel ratio upstream of said catalytic converter which is determined by said first feedback control means.
Claim 8
Dependent Claim
74 words
An apparatus according to claim 5, wherein said first feedback control means comprises means for determining the target air-fuel ratio upstream of said catalytic converter by correcting a reference target air-fuel ratio upstream of said catalytic converter according to the sliding mode control process in order to equalize the air-fuel ratio detected by the air-fuel ratio detecting means positioned downstream of said catalytic converter with a target air-fuel ratio downstream of said catalytic converter.
Claim 9
Dependent Claim
38 words
An apparatus according to claim 5, wherein said second feedback control means comprises means for controlling the amount of fuel supplied to the internal combustion engine through the feedback control loop according to the sliding mode control process.
Claim 10
Dependent Claim
116 words
An apparatus according to claim 7, wherein said fuel supply control means has means for determining an amount of fuel to be supplied to the internal combustion engine depending on at least a rotational speed and an intake air pressure of the internal combustion engine, and wherein said second feedback control means has means for controlling the amount of fuel supplied to the internal combustion engine through the feedback control loop by correcting the amount of fuel to be supplied to the internal combustion according to the sliding mode control process in order to equalize the air-fuel ratio detected upstream of said catalytic converter with the target air-fuel ratio determined by said first feedback control means.
References Cited (Backward Citations)
US5020502A
Cited
US4934328A
Cited
US5117631A
Cited
JPH04224425A
Cited
JPH05180040A
Cited
JPH05216504A
Cited
US5442270A
Cited
US5546916A
Cited
US5462037A
Cited
US5535135A
Cited
US5548514A
Cited
US5566071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-08 | 2001-06-09 | 2001-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-08 | 2005-06-09 | 2005-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-08 | 2009-06-09 | 2009-12-09 | $7700.00 | Window Closed / Lapsed |