Patent US3610221A successfully refreshed from Google Patents.
US3610221A
Expired / Lapsed
US
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Fuel tank purge system and method
Assignee: Motors Liquidation Co
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Filing: 1969-10-06
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Granted: 1971-10-05
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Expires: 1989-10-06
Abstract
Abstract A fuel tank purge system and method in which fuel vapor stored in a nonvented fuel tank is released and conveyed to a vapor compensated idle system of a carburetor whereby the air-fuel mixture ratio at idle and off-idle will be the same curve whether fuel is coming from the carburetor bowl as liquid fuel or whether a portion of the fuel is coming from the fuel tank as fuel vapor.
Inventors
- 👤 Donald D Stoltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:00
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02M25/089
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
A method of storing and then recovering fuel vapor from the normally nonvented fuel tank of an engine and venting the thus stored fuel vapor through the idle system of the carburetor of the engine, said method comprising the steps of storing substantially all of the fuel vapor released from liquid fuel in the fuel tank under pressure in said fuel tank when the engine is not operating, releasing the stored fuel vapor under pressure during engine operation, conveying the released fuel vapor at above atmospheric pressure to the idle system of the carburetor during engine operation, admixing the fuel vapor with liquid fuel and aeriform fluid in the idle system of the carburetor to provide a predetermined air-fuel ratio, maintaining this air-fuel ratio by decreasing the quantity of liquid fuel in direct relation to the amount of fuel vapor conveyed into the idle system of the carburetor, and discharging the resulting air-fuel mixture from the idle port and off-idle port of the carburetor.
Claim 2
Independent Claim
164 words
A method of storing and then recovering fuel vapor from the normally nonvented fuel tank of an engine and venting the thus stored fuel vapor through the idle system of the carburetor of the engine, said method comprising the steps of storing substantially all of the fuel vapor released from liquid fuel in the fuel tank under pressure in said fuel tank when the engine is not operating, releasing the stored fuel vapor under pressure during engine operation, conveying the released fuel vapor at above atmospheric pressure to the idle system of the carburetor during engine operation, admixing the fuel vapor with liquid fuel and aeriform fluid in the idle system of the carburetor to provide a predetermined air-fuel ratio, maintaining this air-fuel ratio by decreasing the quantity of liquid fuel in direct relation to the amount of fuel vapor conveyed into the idle system of the carburetor, and discharging the resulting air-fuel mixture from the idle port and off-idle port of the carburetor.
Claim 3
Dependent Claim
158 words
A fuel tank purge system for an internal combustion engine having a carburetor with an idle system including an idle tube connected to an idle air-bleed passage and in communication through an idle restriction with a lower idle air-bleed passage and through an idle passage to an idle port and off-idle port of said carburetor, and a pressure fuel reservoir, the system comprising valve-controlled conduit means connected to said pressure fuel reserVoir in fuel vapor flow relation thereto and, metering orifice passage means connecting said conduit means to said idle system of said carburetor upstream in terms of the direction of flow of said idle port and said off-idle port, said valve-controlled means including valve means to block fuel vapor flow to said idle system when the engine is not in operation and a pressure regulator valve adapted to block fuel vapor flow to said idle system when the pressure in said pressure fuel reservoir reaches atmospheric pressure.
Claim 4
Dependent Claim
158 words
A fuel tank purge system for an internal combustion engine having a carburetor with an idle system including an idle tube connected to an idle air-bleed passage and in communication through an idle restriction with a lower idle air-bleed passage and through an idle passage to an idle port and off-idle port of said carburetor, and a pressure fuel reservoir, the system comprising valve-controlled conduit means connected to said pressure fuel reserVoir in fuel vapor flow relation thereto and, metering orifice passage means connecting said conduit means to said idle system of said carburetor upstream in terms of the direction of flow of said idle port and said off-idle port, said valve-controlled means including valve means to block fuel vapor flow to said idle system when the engine is not in operation and a pressure regulator valve adapted to block fuel vapor flow to said idle system when the pressure in said pressure fuel reservoir reaches atmospheric pressure.
Claim 5
Dependent Claim
25 words
A fuel tank purge system according to claim 2 wherein said metering orifice passage means is connected to said idle tube of said idle system.
Claim 6
Dependent Claim
33 words
A fuel tank purge system according to claim 2 wherein said metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
Claim 7
Dependent Claim
34 words
A fuel tank purge system according to claim 2 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
Claim 8
Dependent Claim
193 words
A fuel tank purge system for an internal combustion engine having a pressure fuel tank and a carburetor with an idle system including an idle tube connected to idle-bleed passages and in communication through an idle restriction and an idle passage with an idle port and an off-idle port of said carburetor, said system comprising a vapor metering orifice passage means positioned in communication with the idle system of the carburetor upstream of the idle port and off-idle port of said carburetor, and valve-controlled conduit means, including a pressure regulator valve, and a control valve, said valve-controlled conduit means being connected at one end to the pressure fuel tank in vapor flow relation thereto and at its other end to said vapor metering orifice passage means, said pressure regulator valve being adapted to block fuel vapor flow to the idle system when the pressure in the pressure fuel reservoir reaches atmospheric pressure, said control valve being operable to block the flow of fuel vapor to said idle system of said carburetor when the engine is not in operation and operable during engine operation to permit the flow of fuel vapor to said carburetor.
Claim 9
Dependent Claim
193 words
A fuel tank purge system for an internal combustion engine having a pressure fuel tank and a carburetor with an idle system including an idle tube connected to idle-bleed passages and in communication through an idle restriction and an idle passage with an idle port and an off-idle port of said carburetor, said system comprising a vapor metering orifice passage means positioned in communication with the idle system of the carburetor upstream of the idle port and off-idle port of said carburetor, and valve-controlled conduit means, including a pressure regulator valve, and a control valve, said valve-controlled conduit means being connected at one end to the pressure fuel tank in vapor flow relation thereto and at its other end to said vapor metering orifice passage means, said pressure regulator valve being adapted to block fuel vapor flow to the idle system when the pressure in the pressure fuel reservoir reaches atmospheric pressure, said control valve being operable to block the flow of fuel vapor to said idle system of said carburetor when the engine is not in operation and operable during engine operation to permit the flow of fuel vapor to said carburetor.
Claim 10
Dependent Claim
26 words
A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle tube of said idle system.
Claim 11
Dependent Claim
34 words
A fuel tank purge system according to claim 6 wherein said vapor metering orifice passage means is connected to said idle passage of said idle system between said idle restriction and said off-idle port.
Claim 12
Dependent Claim
34 words
A fuel tank purge system according to claim 6 wherein said valve-controlled conduit means includes a pressure relief valve and a vacuum relief valve positioned between the pressure fuel reservoir and said valve means.
References Cited (Backward Citations)
US3191587A
Cited
US2933894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |