Patent US4475504A successfully refreshed from Google Patents.
US4475504A
Expired / Lapsed
US
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Method and apparatus for controlling the idling speed of an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1982-02-03
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Granted: 1984-10-09
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Expires: 2002-02-03
Abstract
Abstract The flow rate of air passing through an air bypass passage which bypasses a throttle valve in an intake passage of an internal combustion engine during idling is corrected depending upon the atmospheric pressure around the engine. Thus, the idling speed of the engine can be stably controlled even at high altitudes.
Inventors
- 👤 Kazuyoshi Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005; F02D11/00; F02D11/06; F02D11/10; F02D2011/101; F02D2011/102
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
221 words
A method for controlling the idling speed of an internal combustion engine having an intake passage, a throttle valve disposed in the intake passage, and an air bypass passage which is connected with the intake passage at a position located upstream of the throttle valve and with the intake passage at a position located downstream of the throttle valve, said method comprising the steps of: detecting the actual idling speed of the engine to produce a first electrical signal corresponding to said speed; detecting the atmospheric pressure surrounding the engine to produce a second electrical signal which indicates said pressure; calculating, based on the first electrical signal, the difference between the actual idling speed of the engine and the desired idling speed; calculating the value of a control output signal from said calculated difference; determining, in response to said second electrical signal, an atmospheric pressure correction coefficient by using one of continuous functions which indicate relationships between the atmospheric pressure and the atmospheric pressure correction coefficient; correcting the calculated value of the control output signal in accordance with said determined atmospheric pressure correction coefficient; and adjusting, based on the control output signal, the flow rate of air passing through the air bypass passage to control the actual idling speed of the engine to bring it close to the desired idling speed.
Claim 2
Independent Claim
221 words
A method for controlling the idling speed of an internal combustion engine having an intake passage, a throttle valve disposed in the intake passage, and an air bypass passage which is connected with the intake passage at a position located upstream of the throttle valve and with the intake passage at a position located downstream of the throttle valve, said method comprising the steps of: detecting the actual idling speed of the engine to produce a first electrical signal corresponding to said speed; detecting the atmospheric pressure surrounding the engine to produce a second electrical signal which indicates said pressure; calculating, based on the first electrical signal, the difference between the actual idling speed of the engine and the desired idling speed; calculating the value of a control output signal from said calculated difference; determining, in response to said second electrical signal, an atmospheric pressure correction coefficient by using one of continuous functions which indicate relationships between the atmospheric pressure and the atmospheric pressure correction coefficient; correcting the calculated value of the control output signal in accordance with said determined atmospheric pressure correction coefficient; and adjusting, based on the control output signal, the flow rate of air passing through the air bypass passage to control the actual idling speed of the engine to bring it close to the desired idling speed.
Claim 3
Dependent Claim
84 words
A method as claimed in claim 1, wherein said method further comprises a step of detecting the change in the amount of load applied to the engine to produce at least one additional electrical signal corresponding to said change and wherein said determining step includes a step of determining, in response to said second and additional electrical signals, an atmospheric pressure correction coefficient by using of continuous functions which indicate relationships between the atmospheric pressure, the engine load, and the atmospheric pressure correction coefficient.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 2, wherein said step of detecting the change in the amount of load includes a step of detecting whether a predetermined load is applied to the engine.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 3, wherein said predetermined load is power-assisted steering.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 3, wherein said predetermined load is an air-conditioner.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 3, wherein said predetermined load is a drive-range gear of an automatic transmission.
Claim 8
Independent Claim
231 words
An apparatus for controlling the idling speed of an internal combustion engine having an intake passage, a throttle valve disposed in the intake passage, and an air bypass passage which is connected with the intake passage at a position located upstream of the throttle valve and with the intake passage at a position located downstream of the throttle valve, said apparatus comprising: means for detecting the actual idling speed of the engine to produce a first electrical signal corresponding to said speed; means for detecting the atmospheric pressure surrounding the engine to produce a second electrical signal which indicates said pressure; processing means for (1) calculating, based on the first electrical signal, the difference between the actual idling speed of the engine and the desired idling speed, (2) calculating the value of a control output signal from said calculated difference, (3) determining, in response to said second electrical signal, an atmospheric pressure correction coefficient by using one of continuous functions which indicate relationships between the atmospheric pressure and the atmospheric pressure correction coefficient, and (4) correcting the calculated value of the control output signal in accordance with said determined atmospheric pressure correction coefficient; and means for adjusting, based on the control output signal, the flow rate of air passing through the air bypass to control the actual idling speed of the engine to bring it close to the desired idling speed.
Claim 9
Independent Claim
231 words
An apparatus for controlling the idling speed of an internal combustion engine having an intake passage, a throttle valve disposed in the intake passage, and an air bypass passage which is connected with the intake passage at a position located upstream of the throttle valve and with the intake passage at a position located downstream of the throttle valve, said apparatus comprising: means for detecting the actual idling speed of the engine to produce a first electrical signal corresponding to said speed; means for detecting the atmospheric pressure surrounding the engine to produce a second electrical signal which indicates said pressure; processing means for (1) calculating, based on the first electrical signal, the difference between the actual idling speed of the engine and the desired idling speed, (2) calculating the value of a control output signal from said calculated difference, (3) determining, in response to said second electrical signal, an atmospheric pressure correction coefficient by using one of continuous functions which indicate relationships between the atmospheric pressure and the atmospheric pressure correction coefficient, and (4) correcting the calculated value of the control output signal in accordance with said determined atmospheric pressure correction coefficient; and means for adjusting, based on the control output signal, the flow rate of air passing through the air bypass to control the actual idling speed of the engine to bring it close to the desired idling speed.
Claim 10
Dependent Claim
80 words
An apparatus as claimed in claim 7, wherein said apparatus further comprises means for detecting the change in the amount of load applied to the engine to produce at least one additional electrical signal corresponding to said change and wherein said processing means determines, in response to said second and additional electrical signals, an atmospheric pressure correction coefficient by using one of continuous functions which indicate relationships between the atmospheric pressure, the engine load, and the atmospheric pressure correction coefficient.
Claim 11
Dependent Claim
32 words
An apparatus as claimed in claim 8, wherein said means for detecting the change in the amount of load includes means for detecting whether a predetermined load is applied to the engine.
Claim 12
Dependent Claim
14 words
An apparatus as claimed in claim 9, wherein said predetermined load is power-assisted steering.
Claim 13
Dependent Claim
14 words
An apparatus as claimed in claim 9, wherein said predetermined load is an air-conditioner.
Claim 14
Dependent Claim
19 words
An apparatus as claimed in claim 9, wherein said predetermined load is a drive-range gear of an automatic transmission.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |