US3844112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine start-up fuel control system
Assignee: Curtiss Wright Corp
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Filing: 1973-06-27
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Granted: 1974-10-29
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Expires: 1993-06-27
Abstract
Abstract The gas turbine start-up fuel control system provides for a characterizer which is programmed to provide a desired sequential acceleration of the engine in accordance with a signal representing corrected compressor speed. The characterizer functions also to effecting, through a current-to-pressure controller, flow of pressurized fluid, simulating compressor outlet pressure, to a compressor inlet temperature sensor, the latter, in turn, controlling the position of a fuel control valve in relation to compressor inlet temperatures through a servovalve mechanism.
Inventors
- 👤 E Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:57
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
A gas turbine engine start-up fuel control system for controlling fuel flow to a turbine engine having an air compressor assembly so as to effect engine acceleration at a preselected rate to the idling state of engine operation, the system comprises: a. a biasing and signal generating means for generating a signal which is a function of compressor discharge pressure biased by ambient air inlet temperature; b. means for sensing ambient air inlet temperature connected to the biasing and signal generating means to transmit a signal representative of the ambient air inlet temperature to said Biasing and signal generating means; c. simulating means for simulating the compressor discharge pressure of the gas turbine engine and conducting a simulated pressure signal to said biasing and signal generating means; and d. fuel control valve means; e. said biasing and signal generating means being connected to a fuel flow control valve to effect adjustment of the fuel control valve; f. said simulating means, including a characterizer, for providing simulated pressure signals which are a function of compressor assembly angular velocity biased by ambient temperature and at predetermined sequential increments.
Claim 2
Dependent Claim
186 words
A gas turbine engine start-up fuel control system for controlling fuel flow to a turbine engine having an air compressor assembly so as to effect engine acceleration at a preselected rate to the idling state of engine operation, the system comprises: a. a biasing and signal generating means for generating a signal which is a function of compressor discharge pressure biased by ambient air inlet temperature; b. means for sensing ambient air inlet temperature connected to the biasing and signal generating means to transmit a signal representative of the ambient air inlet temperature to said Biasing and signal generating means; c. simulating means for simulating the compressor discharge pressure of the gas turbine engine and conducting a simulated pressure signal to said biasing and signal generating means; and d. fuel control valve means; e. said biasing and signal generating means being connected to a fuel flow control valve to effect adjustment of the fuel control valve; f. said simulating means, including a characterizer, for providing simulated pressure signals which are a function of compressor assembly angular velocity biased by ambient temperature and at predetermined sequential increments.
Claim 3
Dependent Claim
64 words
The apparatus of claim 1 wherein speed sensing means is provided to sense compressor assembly angular velocity and generate a signal proportional to such speed and a divider means connected to receive said speed signal and an ambient temperature signal, the divider constructed and arranged to produce an output signal representative of corrected compressor assembly speed and conduct such output signal to the characterizer.
Claim 4
Dependent Claim
61 words
The apparatus of claim 1 wherein a compressor outlet pressure sensing means, including a conduit means, is connected to said biasing and signal generating means to deliver a fluid pressure signal to the latter and wherein a valve means is provided for alternately connecting the compressor outlet pressure sensing means and the simulating means with said biasing and signal generating means.
Claim 5
Dependent Claim
57 words
The apparatus of claim 1 wherein said simulating means comprises a reservoir of pressurized fluid and a current-to-pressure converter which is connected to the characterizer and reservoir to respectively receive signals from the latter and fluid from said reservoir, said current-to-pressure converter functioning to control flow of simulated fluid pressure to said biasing and signal generating means.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1 wherein said fuel flow control valve means is of the type where flow therethrough varies linearly relative to movement of the adjustable valve portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |