Patent US4490791A successfully refreshed from Google Patents.
US4490791A
Expired / Lapsed
US
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Adaptive gas turbine acceleration control
Assignee: Colt Industries Operating Corp
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Filing: 1982-04-19
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Granted: 1984-12-25
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Expires: 2002-04-19
Abstract
Abstract An acceleration schedule, from which data is derived for use in calculating fuel flow during acceleration of a gas turbine engine, is modified each time the engine surges so as to avoid future surges.
Inventors
- 👤 Terry Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:51
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/04; F05D2270/10; F05D2270/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
In a method for the exercise of control over the delivery of fuel to a gas turbine engine, the engine including a gas generator having a compressor, the engine further including a fuel metering system which is responsive to fuel flow command signals for varying the rate of delivery of fuel to the engine, an improved mode of varying fuel flow during acceleration of the engine comprising: storing data comprising an engine acceleration schedule which defines a ratio of a rate of change of gas generator speed to compressor discharge pressure for ratios of gas generator speed to compressor inlet temperature during acceleration, the acceleration schedule comprising a curve defined by a series of points; storing modifier values which correspond to the stored acceleration schedule data; detecting engine surges; varying at least that stored modifier value which corresponds to the point on the acceleration schedule at which a surge has occurred during one acceleration; combining the acceleration schedule data with the modifier values whereby the schedule data will be varied during accelerations occurring subsequent to the said one acceleration; and deriving fuel flow commands from the combined acceleration schedule data and modifier values.
Claim 2
Dependent Claim
193 words
In a method for the exercise of control over the delivery of fuel to a gas turbine engine, the engine including a gas generator having a compressor, the engine further including a fuel metering system which is responsive to fuel flow command signals for varying the rate of delivery of fuel to the engine, an improved mode of varying fuel flow during acceleration of the engine comprising: storing data comprising an engine acceleration schedule which defines a ratio of a rate of change of gas generator speed to compressor discharge pressure for ratios of gas generator speed to compressor inlet temperature during acceleration, the acceleration schedule comprising a curve defined by a series of points; storing modifier values which correspond to the stored acceleration schedule data; detecting engine surges; varying at least that stored modifier value which corresponds to the point on the acceleration schedule at which a surge has occurred during one acceleration; combining the acceleration schedule data with the modifier values whereby the schedule data will be varied during accelerations occurring subsequent to the said one acceleration; and deriving fuel flow commands from the combined acceleration schedule data and modifier values.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the stored modifier values are all initially the same.
Claim 4
Dependent Claim
34 words
The method of claim 2 wherein the step of deriving includes: adjusting the combined data in accordance with the actual compressor discharge pressure to provide a rate of change of gas generator speed command.
Claim 5
Dependent Claim
95 words
The method of claim 3 wherein the step of detecting engine surges comprises: determining whether the engine is in an acceleration mode; sensing the rate of change of compressor discharge pressure; comparing the rate of change of compressor discharge pressure with a preselected maximum permissible rate of change of compressor discharge pressure; and providing an indication that a stored modifier value should be varied when the engine is in the acceleration mode and the actual rate of change of the compressor discharge pressure exceeds the preselected maximum permissible rate of change of compressor discharge pressure.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein the step of deriving a fuel flow command includes: adjusting the combined acceleration schedule data and modifier values in accordance with the actual compressor discharge pressure to provide a rate of change of gas generator speed command.
Claim 7
Dependent Claim
95 words
The method of claim 1 wherein the step of detecting engine surges comprises: determining whether the engine is in an acceleration mode; sensing the rate of change of compressor discharge pressure; comparing the rate of change of compressor discharge pressure with a preselected maximum permissible rate of change of compressor discharge pressure; and providing an indication that a stored modifier value should be varied when the engine is in the acceleration mode and the actual rate of change of the compressor discharge pressure exceeds the preselected maximum permissible rate of change of compressor discharge pressure.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |