US4499882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling air-fuel ratio in internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1983-12-29
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Granted: 1985-02-19
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Expires: 2003-12-29
Abstract
Abstract A system for controlling the air-fuel ratio of an internal combustion engine includes a transient fuel amount increasing device for regulating the supply fuel amount in the transient state of the engine on the basis of the detection of the transient state of the engine, an air-fuel ratio deviation detecting device for detecting the air-fuel ratio deviation from the optimum air-fuel ratio, and a transient fuel increase amount correcting device for correcting the fuel increase amount in the transient state of the engine in accordance with the air-fuel ratio deviation detected by the air-fuel ratio deviation detecting device. The air-fuel deviation from the optimum air-fuel ratio of the air-fuel mixture upon deposition of a deposit on the back surface of the intake valve is prevented, and the drivability of an automobile is improved.
Inventors
- 👤 Kimitaka Saito
- 👤 Tokio Kohama
- 👤 Tsuneyuki Egami
- 👤 Tsutomu Saito
- 👤 Susumu Nogami
- 👤 Yukio Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:40
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/047; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1481
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A system for controlling the air-fuel ratio in an internal combustion engine comprising: a transient fuel amount increasing means for regulating the supply fuel amount in the transient state of the engine on the basis of the detection of the transient state of the engine; an air-fuel ratio deviation detecting means for detecting the deviation of the air-fuel ratio in the transient state of the engine from the optimum air-fuel ratio; and a transient fuel increase amount correcting means for correcting the fuel increase amount in the transient state of the engine in accordance with the air-fuel ratio deviation detected by said air-fuel ratio deviation detecting means.
Claim 2
Independent Claim
107 words
A system for controlling the air-fuel ratio in an internal combustion engine comprising: a transient fuel amount increasing means for regulating the supply fuel amount in the transient state of the engine on the basis of the detection of the transient state of the engine; an air-fuel ratio deviation detecting means for detecting the deviation of the air-fuel ratio in the transient state of the engine from the optimum air-fuel ratio; and a transient fuel increase amount correcting means for correcting the fuel increase amount in the transient state of the engine in accordance with the air-fuel ratio deviation detected by said air-fuel ratio deviation detecting means.
Claim 3
Dependent Claim
20 words
A system according to claim 1, wherein an air-fuel ratio sensor is used for said air-fuel ratio deviation detecting means.
Claim 4
Dependent Claim
28 words
A system according to claim 1, wherein an engine speed sensor for detecting the engine speed of said engine is used for said air-fuel ratio deviation detecting means.
Claim 5
Dependent Claim
43 words
A system according to claim 1, wherein said transient fuel increase amount correcting means corrects at least one of the parameters for deciding said transient fuel increase amount in accordance with the air-fuel ratio deviation detected by said air-fuel ratio deviation detecting means.
Claim 6
Dependent Claim
87 words
A system according to claim 1, wherein said transient fuel increase amount correcting means is provided as a means other than said transient fuel amount increase means, and changes at least one of the parameters for deciding the transient fuel increase amount correction value in accordance with the air-fuel ratio deviation detected by said air-fuel ratio deviation detecting means, and effecting simultaneously the transient fuel amount increase and the fuel amount increase by said transient fuel increase amount correcting means in the transient state of the engine.
Claim 7
Dependent Claim
29 words
A system according to claim 1, wherein said air-fuel ratio deviation is a deviation caused by a deposit which is deposited in an air intake portion of said engine.
Claim 8
Dependent Claim
32 words
A system according to claim 1, wherein said air-fuel ratio deviation is a deviation caused by a deposit which is deposited on a nozzle range of a fuel injector in said engine.
Claim 9
Dependent Claim
52 words
A system according to claim 1, wherein said air-fuel ratio deviation is a deviation caused by the variation of the structure during manufacture between the manufactured air amount detecting means for said engine or the long time variation of the operation characteristic of the intake air amount detecting means of said engine.
Claim 10
Dependent Claim
38 words
A system according to claim 1, wherein said air-fuel ratio deviation is a deviation caused by variations of the structure during manufacture between the manufactured engines or the long time variation of the operation characteristic of said engine.
References Cited (Backward Citations)
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Cited
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Cited
US4240389A
Cited
US4319327A
Cited
US4270503A
Cited
US4411232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |