US4672936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake air control system for an automotive engine
Assignee: Subaru Corp
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Filing: 1985-10-21
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Granted: 1987-06-16
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Expires: 2005-10-21
Abstract
Abstract A system for controlling the amount of intake air of an engine at cold engine operation. A control valve is provided in a bypass around a throttle valve of the engine. The opening degree of the control valve is determined by the opening degree of the throttle valve. When the throttle valve is closed to a position near a throttle valve closed position, the control valve is gradually closed.
Inventors
- 👤 Kunihiro Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:04
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/06; F02M3/07; F02M3/075; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/061; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A system for controlling the intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, and a bypass provided for bypassing the throttle valve, comprising: a control valve provided in the bypass to control the amount of bypassing air; actuating means for operating the control valve; means for detecting the temperature of a coolant of the engine and for producing a first temperature signal when the temperature is lower than a predetermined value and for producing a second temperature signal when the temperature of the coolant is higher than said predetermined value, respectively; means for detecting the position of the throttle valve and for producing a throttle position signal when the throttle valve is closed to an idle opening position; control means responsive to the first temperature signal and to the throttle position signal for actuating the actuating means so as to hold the control valve in an open state for a predetermined period dependent on the temperature, and thereafter to close the control valve, and
Claim 2
Independent Claim
173 words
A system for controlling the intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, and a bypass provided for bypassing the throttle valve, comprising: a control valve provided in the bypass to control the amount of bypassing air; actuating means for operating the control valve; means for detecting the temperature of a coolant of the engine and for producing a first temperature signal when the temperature is lower than a predetermined value and for producing a second temperature signal when the temperature of the coolant is higher than said predetermined value, respectively; means for detecting the position of the throttle valve and for producing a throttle position signal when the throttle valve is closed to an idle opening position; control means responsive to the first temperature signal and to the throttle position signal for actuating the actuating means so as to hold the control valve in an open state for a predetermined period dependent on the temperature, and thereafter to close the control valve, and
Claim 3
Dependent Claim
21 words
said control means responsive to said second temperature signal and to said throttle position signal for gradually closing the control valve.
Claim 4
Dependent Claim
21 words
said control means responsive to said second temperature signal and to said throttle position signal for gradually closing the control valve.
Claim 5
Dependent Claim
24 words
The system according to claim 1, wherein said open state is a constant value opening degree of said control valve during said predetermined period.
Claim 6
Dependent Claim
24 words
The system according to claim 2, wherein said constant value opening degree is dependent on a previously reached opening degree of said throttle valve.
Claim 7
Independent Claim
168 words
A method for controlling intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, a bypass bypassing the throttle valve, and a control valve provided in the bypass to control the amount of bypassing air, comprising the steps of detecting the temperature of coolant of the engine and producing a first temperature signal when the temperature of the coolant is lower than a predetermined value and a second temperature signal when the temperature of the coolant is higher than the predetermined value, detecting the position of the throttle valve and producing a throttle position signal when the throttle valve is closed to an idle opening position, holding the control valve in an open state for a predetermined period dependent on the temperature upon occurrence of the first temperature signal and the throttle position signal, and closing the control valve after said period, and gradually closing the control valve in response to said second temperature signal and to said throttle position signal.
Claim 8
Independent Claim
168 words
A method for controlling intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, a bypass bypassing the throttle valve, and a control valve provided in the bypass to control the amount of bypassing air, comprising the steps of detecting the temperature of coolant of the engine and producing a first temperature signal when the temperature of the coolant is lower than a predetermined value and a second temperature signal when the temperature of the coolant is higher than the predetermined value, detecting the position of the throttle valve and producing a throttle position signal when the throttle valve is closed to an idle opening position, holding the control valve in an open state for a predetermined period dependent on the temperature upon occurrence of the first temperature signal and the throttle position signal, and closing the control valve after said period, and gradually closing the control valve in response to said second temperature signal and to said throttle position signal.
Claim 9
Independent Claim
149 words
A system for controlling the intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, and a bypass provided for bypassing the throttle valve, comprising: a control valve provided in the bypass to control the amount of bypassing air; actuating means for operating the control valve; means for detecting the temperature of a coolant of the engine for producing a temperature signal when the temperature is lower than a predetermined value; means for detecting the position of the throttle valve and for producing a throttle position signal when the throttle valve is closed to an idle opening position; and means responsive to the temperature signal and to the throttle position signal for actuating the actuating means so as to hold the control valve in an open state for a predetermined period dependent on the temperature, and thereafter to close the control valve.
Claim 10
Independent Claim
149 words
A system for controlling the intake air in an automotive engine having an intake passage, a throttle valve in the intake passage, and a bypass provided for bypassing the throttle valve, comprising: a control valve provided in the bypass to control the amount of bypassing air; actuating means for operating the control valve; means for detecting the temperature of a coolant of the engine for producing a temperature signal when the temperature is lower than a predetermined value; means for detecting the position of the throttle valve and for producing a throttle position signal when the throttle valve is closed to an idle opening position; and means responsive to the temperature signal and to the throttle position signal for actuating the actuating means so as to hold the control valve in an open state for a predetermined period dependent on the temperature, and thereafter to close the control valve.
Claim 11
Dependent Claim
24 words
The system according to claim 5, wherein said open state is a constant value opening degree of said control valve during said predetermined period.
Claim 12
Dependent Claim
24 words
The system according to claim 6 wherein said constant value opening degree is dependent on a previously reached opening degree of said throttle value.
References Cited (Backward Citations)
US4289100A
Cited
US4414943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |