Patent US3823699A successfully refreshed from Google Patents.
US3823699A
Expired / Lapsed
US
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Deceleration fuel flow and emission control for internal combustion engines
Assignee: Aerodex Inc
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Filing: 1972-10-20
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Granted: 1974-07-16
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Expires: 1992-10-20
Abstract
Abstract A control for the idling carbureted mixture of fuel and air of a vehicle-propelling internal combustion engine to reduce the fuel to air ratio when the vehicle is decelerating and is coupled to the engine. Engine intake manifold pressure and throttle valve setting govern the control which preferably leans the mixture sufficiently so it is not combustible in the engine.
Inventors
- 👤 P Adair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:24
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/02; F02M3/04; F02M3/055; Y; Y10; Y10S; Y10S261/00; Y10S261/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
In a vehicle-propelling internal combustion engine having a duct for admitting a carbureted mixture of air and fuel to an intake manifold, a throttle valve in said duct, and an idle duct by-passing said valve, the combination of an idle mixture control comprising: self-contained separate component means connected by passageway means to said manifold and to said idle duct and including means responsive to a predetermined negative pressure in said manifold for communicating said idle duct with the atmosphere to decrease the flow of fuel therethrough and therefor decrease the ratio of fuel to air in the mixture admitted therefrom to said manifold and valve means controlling communication between said responsive means and said manifold; and mechanical means connected to said valve means and to said throttle valve for opening said valve means when said throttle valve is closed.
Claim 2
Dependent Claim
139 words
In a vehicle-propelling internal combustion engine having a duct for admitting a carbureted mixture of air and fuel to an intake manifold, a throttle valve in said duct, and an idle duct by-passing said valve, the combination of an idle mixture control comprising: self-contained separate component means connected by passageway means to said manifold and to said idle duct and including means responsive to a predetermined negative pressure in said manifold for communicating said idle duct with the atmosphere to decrease the flow of fuel therethrough and therefor decrease the ratio of fuel to air in the mixture admitted therefrom to said manifold and valve means controlling communication between said responsive means and said manifold; and mechanical means connected to said valve means and to said throttle valve for opening said valve means when said throttle valve is closed.
Claim 3
Dependent Claim
48 words
The control defined in claim 1 including an adjustable needle valve controlling the outlet of the idle duct, said needle valve having a duct therein terminating in an outlet upstream of said ilde duct outlet, and conduit means communicating said needle valve duct with the pressure responsive means.
Claim 4
Dependent Claim
52 words
The control defined in claim 1 in which the pressure responsive means includes valve means, adjustable means urging said valve means to closed position, and diaphragm means having one side thereof exposed to atmospheric pressure and The other side thereof exposable to manifold pressure for urging said valve means to open position.
Claim 5
Dependent Claim
36 words
The control defined in claim 1 in which the ratio of fuel to air in the mixture admitted from the idle duct is descreased to the extent where the mixture is not combustible in the engine.
References Cited (Backward Citations)
GB223758A
Cited
US2439573A
Cited
US2443562A
Cited
US2453125A
Cited
FR1026466A
Cited
US2957463A
Cited
DE1179765B
Cited
GB1217948A
Cited
US3677526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |