US3774582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Idling speed control system for an automotive gasoline powered internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1972-11-09
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Granted: 1973-11-27
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Expires: 1992-11-09
Abstract
Abstract An idling speed control system for an automotive gasoline powered internal combustion engine which system is adapted to vary the opening condition of a carburetor throttle valve in dependence on the variations in the atmospheric pressure. The idling speed control system includes a throttle opening device which is actuated by intake manifold vacuum for opening slightly the carburetor throttle valve during idling operation of the engine, a solenoid control valve for controlling the supply of intake manifold vacuum to the throttle opening device, and a vacuum level control device which is associated with the solenoid control valve and which is arranged to increase the level of the intake manifold vacuum supplied to the throttle opening device when the atmospheric pressure decreases below a predetermined level whereby the carburetor throttle valve is opened slightly more to provide the engine with an air-fuel mixture of proper air-fuel ratio.
Inventors
- 👤 K Masaki
- 👤 H Maruoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:48
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/06; F02M3/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
239 words
An idling speed control system for an internal combustion engine having a carburetor throttle valve, comprising, in combination, a throttle actuating lever fixedly connected to said carburetor throttle valve for opening and closing said carburetor throttle valve, a throttle opening means connected with said throttle actuating lever for varying the opening degree of said carburetor throttle valve during idling operation of said engine in response to an intake manifold vacuum of said engine, a conduit means connected to said throttle opening means for supplying intake manifold vacuum thereto when opened for actuating said throttle opening means, a solenoid control valve means connected to said conduit means for opening said conduit means when energized, a barometric switch means electrically connected to said solenoid control valve means for energizing said solenoid control valve means when the atmospheric pressure is below a predetermined level and a vacuum level control means connected with said solenoid control valve means for controlling the level of the intake manifold vacuum to be supplied through said conduit means to said throttle opening means in dependence on the variations in the atmospheric pressure, said vacuum level control means increasing the level of the intake manifold vacuum to be admitted to said throttle opening means when the atmospheric pressure decreases, whereby said throttle opening means rotates said throttle actuating lever in a direction to increase the opening degree of said carburetor throttle valve during idling operation of said engine.
Claim 2
Dependent Claim
239 words
An idling speed control system for an internal combustion engine having a carburetor throttle valve, comprising, in combination, a throttle actuating lever fixedly connected to said carburetor throttle valve for opening and closing said carburetor throttle valve, a throttle opening means connected with said throttle actuating lever for varying the opening degree of said carburetor throttle valve during idling operation of said engine in response to an intake manifold vacuum of said engine, a conduit means connected to said throttle opening means for supplying intake manifold vacuum thereto when opened for actuating said throttle opening means, a solenoid control valve means connected to said conduit means for opening said conduit means when energized, a barometric switch means electrically connected to said solenoid control valve means for energizing said solenoid control valve means when the atmospheric pressure is below a predetermined level and a vacuum level control means connected with said solenoid control valve means for controlling the level of the intake manifold vacuum to be supplied through said conduit means to said throttle opening means in dependence on the variations in the atmospheric pressure, said vacuum level control means increasing the level of the intake manifold vacuum to be admitted to said throttle opening means when the atmospheric pressure decreases, whereby said throttle opening means rotates said throttle actuating lever in a direction to increase the opening degree of said carburetor throttle valve during idling operation of said engine.
Claim 3
Dependent Claim
45 words
An idling speed control system as claim in claim 1, further comprising an engine temperature responsive means electrically connected to said solenoid control valve means, said engine temperature responsive means energizing said solenoid control valve means when the engine temperature is below a predetermined level.
Claim 4
Dependent Claim
137 words
An idling speed control system as claimed in claim 1, wherein said throttle opening means includes a diaphragm housing having first and second chambers, a diaphragm disposed in said diaphragm housing between said first and second chambers, a plunger fixedly connected to said diaphragm and movable therewith, said plunger having an end portion in abutting engagement with said throttle actuating lever, and a compression spring disposed in sAid first chamber for biasing said diaphragm in a direction to cause said throttle actuating lever to decrease the opening degree of said carburetor throttle valve, said first chamber communicating with said conduit means and being supplied with the intake manifold vacuum, whereby said diaphragm and accordingly said plunger are moved in a direction to cause said throttle actuating lever to increase the opening degree of said carburetor throttle valve.
Claim 5
Dependent Claim
89 words
An idling speed control system as claimed in claim 1, wherein said solenoid control valve means includes an inlet to which intake manifold vacuum is supplied, a first outlet communicating with said conduit means, a second outlet for controlling the level of the intake manifold vacuum delivered to said conduit means through said first outlet, a movable core for providing communication between said inlet and said first outlet, and a solenoid coil for moving said movable core to provide communication between said inlet and said first outlet when energized.
Claim 6
Dependent Claim
110 words
An idling speed control system as claimed in claim 1, wherein said vacuum level control means includes a vacuum level control chamber having a control port communicating with said second outlet of said solenoid control valve means and an air vent vented to the atmosphere, and a barometric pressure compensating diaphragm assembly having means responsive to variations in the atmospheric pressure, said means of said barometric pressure compensating diaphragm assembly decreasing the effective sectional area of said control port of said vacuum level control chamber when the atmospheric pressure is below the predetermined level, whereby the level of the intake manifold vacuum supplied to said throttle opening means is increased.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |