US5209207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throttle valve control system for automotive engine
Assignee: Mazda Motor Corp
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Filing: 1991-09-30
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Granted: 1993-05-11
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Expires: 2011-09-30
Abstract
Abstract A throttle valve control system calculates a throttle opening of a throttle valve according to a predetermined relationship based on the displacement of an accelerator and regulates an air-fuel ratio at which a fuel mixture is applied to the cylinders. The speed at which the throttle valve is driven is controlled, based on the throttle opening and the air-fuel ratio, so as to be lower when the air-fuel ratio provides a lean fuel mixture than when the air-fuel ratio provides a rich fuel mixture. The throttle valve is finally driven to open to the throttle opening at this speed.
Inventors
- 👤 Yuji Shitani
- 👤 Katsumi Nakamura
- 👤 Tatsuya Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:18
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/0015; F02D35/0023; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D43/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A throttle valve control system for an automotive engine provided with a throttle valve for introducing intake air according to a displacement of an accelerator, comprising: displacement detecting means for detecting the displacement of the accelerator; control means for controlling a target throttle opening of said throttle valve according to a predetermined relationship based on the displacement of the accelerator detected by the displacement detecting means, for regulating an air-fuel ratio at which a fuel mixture is supplied to cylinders of said engine based on engine operating conditions, and for making a speed at which a throttle valve is driven toward the target throttle opening lower when a target air-fuel ratio represents a lean fuel mixture than when said target air-fuel ratio represent a rich fuel mixture; air-fuel ratio setting means for setting said air-fuel ratio based on said target air-fuel ratio; and drive means for driving said throttle valve so that it opens at said speed.
Claim 2
Dependent Claim
157 words
A throttle valve control system for an automotive engine provided with a throttle valve for introducing intake air according to a displacement of an accelerator, comprising: displacement detecting means for detecting the displacement of the accelerator; control means for controlling a target throttle opening of said throttle valve according to a predetermined relationship based on the displacement of the accelerator detected by the displacement detecting means, for regulating an air-fuel ratio at which a fuel mixture is supplied to cylinders of said engine based on engine operating conditions, and for making a speed at which a throttle valve is driven toward the target throttle opening lower when a target air-fuel ratio represents a lean fuel mixture than when said target air-fuel ratio represent a rich fuel mixture; air-fuel ratio setting means for setting said air-fuel ratio based on said target air-fuel ratio; and drive means for driving said throttle valve so that it opens at said speed.
Claim 3
Dependent Claim
147 words
A throttle valve control system for an automotive engine having two groups of cylinders, each group of cylinders being provided with a throttle valve for introducing intake air according to a displacement of an accelerator, comprising: displacement detecting means for detecting the displacement of the accelerator; control means for controlling respective air-fuel ratios of a fuel mixture supplied to said two groups of cylinders and setting a throttle opening of one throttle valve for one of said two groups of cylinders smaller than a throttle opening of another throttle valve for the other of said two groups of cylinders so that air-fuel ratios are controlled to provide a lean fuel mixture to one of said two groups of cylinders and a rich fuel mixture to the other of said two groups of cylinders; and drive means for driving the throttle valves to open to respective throttle openings.
Claim 4
Dependent Claim
147 words
A throttle valve control system for an automotive engine having two groups of cylinders, each group of cylinders being provided with a throttle valve for introducing intake air according to a displacement of an accelerator, comprising: displacement detecting means for detecting the displacement of the accelerator; control means for controlling respective air-fuel ratios of a fuel mixture supplied to said two groups of cylinders and setting a throttle opening of one throttle valve for one of said two groups of cylinders smaller than a throttle opening of another throttle valve for the other of said two groups of cylinders so that air-fuel ratios are controlled to provide a lean fuel mixture to one of said two groups of cylinders and a rich fuel mixture to the other of said two groups of cylinders; and drive means for driving the throttle valves to open to respective throttle openings.
Claim 5
Dependent Claim
38 words
A throttle valve control system as recited in claim 2, wherein said control means sets said respective throttle openings according to a predetermined linear relationship relative to the displacement of the accelerator detected by the displacement detecting means.
Claim 6
Dependent Claim
38 words
A throttle valve control system as recited in claim 3, wherein said predetermined linear relationship has a slope smaller for air-fuel ratios which provide a lean fuel mixture than for air-fuel ratios which provide a rich fuel mixture.
Claim 7
Dependent Claim
71 words
A throttle valve control system as recited in claim 3, wherein said automotive engine comprises a V-type multicylinder engine having two cylinder banks, each of said groups of cylinders being formed in one of said cylinder banks, and wherein said control means sets an air-fuel ratio so as to provide a lean fuel mixture for one of said cylinder banks and a rich fuel mixture for another of said cylinder banks.
References Cited (Backward Citations)
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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) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |