US4404945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel-supply control system for gas-turbine engine
Assignee: Nissan Motor Co Ltd
•
Filing: 1981-08-04
•
Granted: 1983-09-20
•
Expires: 2001-08-04
Abstract
Abstract A fuel-supply control system for a gas-turbine engine includes a fuel injector opening into an engine combustion chamber, and a reservoir connected to the fuel injector. At least two different lines are each connected at one end to the reservoir. These lines are permitted to pass fuel therethrough to supply the fuel to the combustion chamber via the reservoir and the fuel injector. Metering valves whose number is equal to the number of the lines are arranged each in the lines in such a manner that the lengths of the lines from the corresponding metering valve to the reservoir are different from each other. The metering valves are changed from one of open and closed states to the other when energized. A sensor is provided for detecting a certain engine operating condition. A controller is connected to the sensor for producing a pulse train whose duty cycle depends on the engine operating condition. The pulse train is fed to the metering valves to open them periodically.
Inventors
- 👤 Yasuo Fujikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:52
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
A fuel-supply control system for a gas-turbine engine, comprising: (a) a fuel injector opening to an engine combustion chamber; (b) a reservoir connected to the fuel injector; (c) at least two different lines each connected at one end to the reservoir, the lines being permitted to pass fuel therethrough to supply the fuel to the combustion chamber through the reservoir and the fuel injector; (d) metering valves whose number is equal to the number of the lines and which are arranged in the lines respectively in such a manner that the lengths of the lines from the corresponding metering valve to the reservoir are different from each other, the metering valves being changed from one of open and closed states to the other when energized; (e) a sensor detecting an engine operating condition; and (f) a controller electrically connected to the sensor for receiving the output signal from the sensor indicative of the engine operating condition, the controller producing a pulse train whose duty cycle responds to the engine operating condition and feeding the pulse train to the metering valves to open them periodically.
Claim 2
Dependent Claim
184 words
A fuel-supply control system for a gas-turbine engine, comprising: (a) a fuel injector opening to an engine combustion chamber; (b) a reservoir connected to the fuel injector; (c) at least two different lines each connected at one end to the reservoir, the lines being permitted to pass fuel therethrough to supply the fuel to the combustion chamber through the reservoir and the fuel injector; (d) metering valves whose number is equal to the number of the lines and which are arranged in the lines respectively in such a manner that the lengths of the lines from the corresponding metering valve to the reservoir are different from each other, the metering valves being changed from one of open and closed states to the other when energized; (e) a sensor detecting an engine operating condition; and (f) a controller electrically connected to the sensor for receiving the output signal from the sensor indicative of the engine operating condition, the controller producing a pulse train whose duty cycle responds to the engine operating condition and feeding the pulse train to the metering valves to open them periodically.
Claim 3
Dependent Claim
75 words
A fuel-supply control system as defined in claim 1, wherein the reservoir is of an elongated form and the number of the lines containing metering valves is three, one of the lines, the first line, being connected to the reservoir at the center of one side of the reservoir, the other two lines, the second and third lines, being connected to the reservoir at the opposite ends of the foregoing side of the reservoir respectively.
Claim 4
Dependent Claim
49 words
A fuel-supply control system as defined in claim 2, wherein the first line is helical, the second line is straight, and the third line is helical with a number of turns about its axis greater than that of the first line, from the corresponding metering valve to the reservoir.
Claim 5
Dependent Claim
46 words
A fuel-supply control system as defined in claim 2, wherein the reservoir is connected to the fuel injector by means of a fourth line, the fourth line being connected to the reservoir at the center of the side of the reservoir remote from the other lines.
Claim 6
Dependent Claim
23 words
A fuel-supply control system as defined in claim 2, wherein the reservoir is constant in internal cross-sectional area along the lengthwise direction thereof.
Claim 7
Dependent Claim
39 words
A fuel-supply control system as defined in claim 1, further comprising a second reservoir supplied with fuel, the lines each being connected at the other end to the second reservoir for introducing therein the fuel from the second reservoir.
Claim 8
Dependent Claim
29 words
A fuel-supply control system as defined in claim 6, wherein the lengths of the lines from the second reservoir to the corresponding metering valve are different from each other.
Claim 9
Dependent Claim
71 words
A fuel-supply control system as defined in claim 7, wherein the second reservoir is of an elongated form and the number of the lines containing the corresponding valves is three, one of the lines being connected to the second reservoir at the center of one side of the second reservoir, the other two lines being connected to the second reservoir at the opposite ends of the foregoing side of the reservoir.
Claim 10
Dependent Claim
41 words
A fuel-supply control system as defined in claim 8, wherein the second reservoir is supplied with fuel through a fifth line connected to the second reservoir at the center of the side of the second reservoir remote from the other lines.
Claim 11
Dependent Claim
24 words
A fuel-supply control system as defined in claim 8, wherein the second reservoir is constant in internal cross-sectional area along the lengthwise direction thereof.
References Cited (Backward Citations)
US3669081A
Cited
US3688750A
Cited
US3786789A
Cited
US4069800A
Cited
US4256075A
Cited
US4336782A
Cited
US4269156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |