US4721082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling an air/fuel ratio of a vehicle mounted internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1987-01-22
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Granted: 1988-01-26
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Expires: 2007-01-22
Abstract
Abstract A method determines a control parameter of an air/fuel ratio of an internal combustion engine having an idle rotational speed control device by which the throttle valve is opened when an electric unit such as the head light or the air conditioner is turned on during the idling of the engine. The air/fuel ratio is controlled to be leaner than a target air fuel ratio when the engine is idling, and controlled to a further leaner side when the electric unit is operating during the idling of the engine.
Inventors
- 👤 Yoshitaka Hibino
- 👤 Takeshi Fukuzawa
- 👤 Atsushi Totsune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:31
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1486; F02D41/1487; F02D41/04; F02D41/08; F02D41/083; F02M; F02M3/00; F02M3/06; F02M3/07; F02M3/075; F02D41/1444; F02D41/1454; F02D41/1456
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A control method of controlling an air/fuel ratio of an internal combustion engine having a throttle valve and an idle rotational speed control device by which an opening degree of the throttle valve is increased when a unit of large electric load is operating while the engine is idling, the control method comprising steps of: detecting an idling operation of said internal combustion engine; controlling, when said idling operation is detected, an air/fuel ratio of mixture to be supplied to said internal combustion engine to a lean side with respect to a target air/fuel ratio which is to be used in a steady state operation of said internal combustion engine; detecting an operation of said unit of large electric load during the idling operation of said internal combustion engine; and controlling the air/fuel ratio of mixture to be supplied to said internal combustion engine to a further lean side with respect to said target air/fuel ratio when said operation of said unit of large electric load is detected.
Claim 2
Dependent Claim
168 words
A control method of controlling an air/fuel ratio of an internal combustion engine having a throttle valve and an idle rotational speed control device by which an opening degree of the throttle valve is increased when a unit of large electric load is operating while the engine is idling, the control method comprising steps of: detecting an idling operation of said internal combustion engine; controlling, when said idling operation is detected, an air/fuel ratio of mixture to be supplied to said internal combustion engine to a lean side with respect to a target air/fuel ratio which is to be used in a steady state operation of said internal combustion engine; detecting an operation of said unit of large electric load during the idling operation of said internal combustion engine; and controlling the air/fuel ratio of mixture to be supplied to said internal combustion engine to a further lean side with respect to said target air/fuel ratio when said operation of said unit of large electric load is detected.
References Cited (Backward Citations)
US4376427A
Cited
US4617890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |