US3710770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel system
Assignee: AMERICAN ENVIRONMENTAL RES
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Filing: 1970-10-16
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Granted: 1973-01-16
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Expires: 1990-10-16
Abstract
Abstract A fuel system for a gaseous fueled internal combustion engine injects gas into a mixing chamber for mixing with air by way of a plurality of check valves. The check valves prevent the buildup of an explosive fuel-air mixture in the fuel lines. In a preferred embodiment, the check valves have progressively increasing cracking pressures so that, as the operator opens the throttle, the increasing pressure differential across the valves causes them to open in succession so that a precisely controlled amount of gas is fed to the chamber for the prevailing engine speed and load conditions. During idling, gaseous fuel is fed to the mixing chamber through a separate fuel line to provide the proper fuel-air mixture to run the engine under no load. Also, engine exhaust products are injected into the system''s air intake just above the mixing chamber to blanket the gases in the mixing chamber and thus contain them. Further provision is made for shutting off the supply of gas in the event that the engine does not start or stalls as a safety measure and to conserve fuel.
Inventors
- 👤 M Newkirk
- 👤 A Falabella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
F; F02; F02M; F02M21/00; F02M21/02; F02M21/04; F02M21/042; F02M21/0203; F02M21/0206; F02M21/0218; F02M21/023; F02M21/0242; F02M26/00; F02M26/13; F02M26/17; F02M26/19; F02B; F02B43/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30; Y10; Y10S; Y10S123/00; Y10S123/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
In a gaseous fueled internal combustion engine, the improvements comprising, A. a fuel system which injects a gas under pressure above atmospheric into the engine''s fuel-air mixing chamber through a plurality of ports, B. a valve associated with each port which opens in response to a selected pressure differential to feed gas into the chamber, and C. means for regulating the injection pressure of gas fed into the chamber.
Claim 2
Dependent Claim
69 words
In a gaseous fueled internal combustion engine, the improvements comprising, A. a fuel system which injects a gas under pressure above atmospheric into the engine''s fuel-air mixing chamber through a plurality of ports, B. a valve associated with each port which opens in response to a selected pressure differential to feed gas into the chamber, and C. means for regulating the injection pressure of gas fed into the chamber.
Claim 3
Dependent Claim
40 words
The engine defined in claim 1 wherein said valves have progressively increasing cracking pressures so that a precisely controlled amount of gas is injected into the chamber for the prevailing engine load and speed as the regulating means is varied.
Claim 4
Dependent Claim
25 words
The engine defined in claim 1 and further including a separate port through which fuel is injected into the mixing chamber as the engine idles.
Claim 5
Dependent Claim
56 words
The engine defined in claim 1 and further including A. a butterfly valve in the engine air intake above the mixing chamber, C. linkage between the butterfly valve and the regulating means so that adjustment of the regulating means also adjusts the butterfly valve so as to maintain a combustible fuel-air mixture in the mixing chamber.
Claim 6
Dependent Claim
42 words
The engine defined in claim 1 and further including A. means for stopping the flow of fuel to the ports in response to the absence of a control signal, and B. means for developing a control signal whenever the engine is running.
Claim 7
Dependent Claim
54 words
The engine defined in claim 5 wherein A. the stopping means comprise solenoid valves in the flow path to the ports, B. the signal developing means comprise means responsive to the pressure in the engine exhaust manifOld for maintaining the solenoid valves open as long as the manifold pressure goes beyond a selected value.
Claim 8
Dependent Claim
100 words
In a gaseous fueled internal combustion engine, the improvement comprising A. a carburetor having an air intake section and a mixing chamber downstream from the intake section, B. a first manifold in the mixing chamber, C. a plurality of check valves in the manifold arranged to pass gas from the manifold to the mixing chamber, D. means for supplying gas to the manifold, E. means for regulating the pressure of the gas fed to the manifold, F. a separate idling gas supply to the mixing chamber, and G. means for controlling the pressure of the gas from the separate supply.
Claim 9
Dependent Claim
100 words
In a gaseous fueled internal combustion engine, the improvement comprising A. a carburetor having an air intake section and a mixing chamber downstream from the intake section, B. a first manifold in the mixing chamber, C. a plurality of check valves in the manifold arranged to pass gas from the manifold to the mixing chamber, D. means for supplying gas to the manifold, E. means for regulating the pressure of the gas fed to the manifold, F. a separate idling gas supply to the mixing chamber, and G. means for controlling the pressure of the gas from the separate supply.
Claim 10
Dependent Claim
68 words
The engine defined in claim 7 and further including A. a solenoid valve in the gas supply means to the manifold, B. a conventional ignition switch connected to open the solenoid valve whenever the switch is in its START position, and C. a switch responsive to the pressure in the engine exhaust manifold, said switch connected so as to open the solenoid valve whenever the engine is running.
Claim 11
Dependent Claim
15 words
The engine defined in claim 7 wherein said check valves have progressively increasing cracking pressures.
Claim 12
Dependent Claim
27 words
The engine defined in claim 8 and further including a valve in the separate supply which opens only when the ignition switch is in its IGNITION position.
Claim 13
Dependent Claim
126 words
In a gaseous-fueled internal combustion engine, the improvement comprising A. a carburetor having an air intake section and a mixing chamber downstream from the intake section, B. a first manifold in the mixing chamber, C. a plurality of ports in the manifold arranged to pass gas from the manifold to the mixing chamber, D. means for supplying gas to the manifold, E. means for regulating the pressure of the gas fed to the manifold, F. a separate idling gas supply to the mixing chamber, G. means for controlling the pressure of the gas from the separate supply, H. means for stopping the flow of fuel to the ports in response to a control signal, and I. means for developing a control signal whenever the engine stops.
Claim 14
Dependent Claim
126 words
In a gaseous-fueled internal combustion engine, the improvement comprising A. a carburetor having an air intake section and a mixing chamber downstream from the intake section, B. a first manifold in the mixing chamber, C. a plurality of ports in the manifold arranged to pass gas from the manifold to the mixing chamber, D. means for supplying gas to the manifold, E. means for regulating the pressure of the gas fed to the manifold, F. a separate idling gas supply to the mixing chamber, G. means for controlling the pressure of the gas from the separate supply, H. means for stopping the flow of fuel to the ports in response to a control signal, and I. means for developing a control signal whenever the engine stops.
References Cited (Backward Citations)
US1507533A
Cited
US664025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |