US3686859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine engine starting circuit
Assignee: Colt Industries Operating Corp
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Filing: 1970-09-25
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Granted: 1972-08-29
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Expires: 1990-09-25
Abstract
Abstract A starting circuit for a regenerative gas turbine engine wherein a fuel metering valve and power turbine inlet nozzles are positioned in response to control signals provided by a closed loop system. Engine operating parameters, including gas generator turbine inlet temperature, are sensed and electrical signals commensurate therewith are delivered as inputs to the logic circuitry where, in combination with selected operational mode inputs provided by the operator, they are operated upon to provide control signals for the power turbine nozzle actuators and the gas generator fuel control metering valve.
Inventors
- 👤 Albert H White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:41
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A fuel control for a gas turbine engine, said engine including a gas generator section, said control comprising: a fuel metering valve for regulating the rate at which fuel is delivered to the engine via a main fuel supply conduit; valve adjusting means coupled to said metering valve, said adjusting means being responsive to fuel flow error signals supplied thereto; a starting circuit for delivering fuel to said engine upon start-up, said starting circuit being connected to said main fuel supply conduit upstream and downstream of said metering valve for bypassing said metering valve; and means including a valve operated in response to fuel pressure in said conduit upstream of said metering valve for automatically disabling said starting circuit after said engine is started.
Claim 2
Dependent Claim
124 words
A fuel control for a gas turbine engine, said engine including a gas generator section, said control comprising: a fuel metering valve for regulating the rate at which fuel is delivered to the engine via a main fuel supply conduit; valve adjusting means coupled to said metering valve, said adjusting means being responsive to fuel flow error signals supplied thereto; a starting circuit for delivering fuel to said engine upon start-up, said starting circuit being connected to said main fuel supply conduit upstream and downstream of said metering valve for bypassing said metering valve; and means including a valve operated in response to fuel pressure in said conduit upstream of said metering valve for automatically disabling said starting circuit after said engine is started.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1 wherein said starting circuit comprises: a slug pump; means for delivering fuel to said slug pump; and means providing communication between the outlet of said slug pump and the downstream side of said metering valve.
Claim 4
Dependent Claim
81 words
The apparatus of claim 2 wherein said disabling means further comprises: a main pressurizing valve positioned upstream of said metering valve, said pressurizing valve including a housing having a movable piston therein, said housing forming part of said means providing communication between said slug pump outlet and the downstream side of said metering valve, said piston being movable in response to fuel pressure upstream of said metering valve to close the path through said housing for fuel from said slug pump.
Claim 5
Dependent Claim
198 words
A fuel control for a gas turbine engine, said engine including a gas generator section, said control comprising: a fuel metering valve for regulating the rate at which fuel is delivered to the engine; valve adjusting means coupled to said metering valve, said adjusting means being responsive to fuel flow error signals supplied thereto; means for sensing the turbine inlet temperature of said engine gas generator and for generating a signal commensurate therewith; means for sensing the speed of said engine gas generator and for generating a signal commensurate therewith; means responsive to said signals commensurate with speed and temperature for generating a first signal commensurate with desired fuel flow; means for generating a signal commensurate with the desired gas generator speed; means responsive to said actual and desired speed signals for generating a second signal commensurate with desired fuel flow; selector means responsive to said first and second fuel flow signals for passing the signal calling for the least fuel flow to said valve adjusting means; a starting circuit for delivering fuel to said engine upon start up, said starting circuit bypassing said metering valve; and means for disabling said starting circuit when said engine is started.
Claim 6
Dependent Claim
198 words
A fuel control for a gas turbine engine, said engine including a gas generator section, said control comprising: a fuel metering valve for regulating the rate at which fuel is delivered to the engine; valve adjusting means coupled to said metering valve, said adjusting means being responsive to fuel flow error signals supplied thereto; means for sensing the turbine inlet temperature of said engine gas generator and for generating a signal commensurate therewith; means for sensing the speed of said engine gas generator and for generating a signal commensurate therewith; means responsive to said signals commensurate with speed and temperature for generating a first signal commensurate with desired fuel flow; means for generating a signal commensurate with the desired gas generator speed; means responsive to said actual and desired speed signals for generating a second signal commensurate with desired fuel flow; selector means responsive to said first and second fuel flow signals for passing the signal calling for the least fuel flow to said valve adjusting means; a starting circuit for delivering fuel to said engine upon start up, said starting circuit bypassing said metering valve; and means for disabling said starting circuit when said engine is started.
Claim 7
Dependent Claim
23 words
The apparatus of claim 4 wherein said disabling means comprises: valve means operated in response to fuel pressure upstream of said metering valve.
Claim 8
Dependent Claim
41 words
The apparatus of claim 5 wherein said starting circuit comprises: a slug pump; means for delivering fuel to said slug pump; and means for providing communication between the outlet of said slug pump and the downstream side of said metering valve.
Claim 9
Dependent Claim
81 words
The apparatus of claim 6 wherein said disabling means further comprises: a main pressurizing valve positioned upstream of said metering valve, said pressurizing valve including a housing having a movable piston therein, said housing forming part of said means providing communication between said slug pump outlet and the downstream side of said metering valve, said piston being movable in response to fuel pressure upstream of said metering valve to close the path through said housing for fuel from said slug pump.
Claim 10
Dependent Claim
85 words
In a fuel control for a gas turbine engine, said engine including a gas generator section and said control including a fuel metering valve for regulating the rate at which fuel is delivered to the engine, a starting circuit comprising: a slug pump; means for delivering fuel to said slug pump; means providing communication between the outlet of said slug pump and the downstream side of said metering valve; and means responsive to fuel pressure upstream of said metering valve for disabling said starting circuit.
Claim 11
Dependent Claim
85 words
In a fuel control for a gas turbine engine, said engine including a gas generator section and said control including a fuel metering valve for regulating the rate at which fuel is delivered to the engine, a starting circuit comprising: a slug pump; means for delivering fuel to said slug pump; means providing communication between the outlet of said slug pump and the downstream side of said metering valve; and means responsive to fuel pressure upstream of said metering valve for disabling said starting circuit.
Claim 12
Dependent Claim
80 words
The apparatus of claim 8 wherein said disabling means comprises: a main pressurizing valve positioned upstream of said metering valve, said pressurizing valve including a housing having a movable piston therein, said housing forming part of said means providing communication between said slug pump outlet and the downstream side of said metering valve, said piston being movable in responSe to fuel pressure upstream of said metering valve to close the path through said housing for fuel from said slug pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |