Patent US2306392A successfully refreshed from Google Patents.
Patent US5361579A successfully refreshed from Google Patents.
US5361579A
Expired / Lapsed
US
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Turbojet fuel control system
Assignee: Sundstrand Corp
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Filing: 1993-06-01
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Granted: 1994-11-08
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Expires: 2013-06-01
Abstract
Abstract The problem of controlling fuel flow rate to a turbojet engine (14) is solved using a fuel control system (12). The fuel control system (12) uses an acceleration control function (66) receiving an acceleration setpoint signal (82) and an acceleration feedforward signal (90). A summer (92) calculates a difference between these two signals to develop an acceleration error signal (94) which is input to a proportional integral control (96) to develop a control signal (46) for controlling a fuel servo valve (44).
Inventors
- 👤 Donald M. Bachelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:50
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/04; F05D2270/12; F05D2270/122
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
A control system for a gas turbine engine having a fuel servo valve controlling the flow of fuel to the engine combustor wherein operation of said fuel servo valve is controlled by engine acceleration error according to an apparatus comprising: means for sensing engine speed and providing first signals indicative of that speed; a source of second signals, indicating the desired engine speed; means for creating acceleration set point signals from said first and second signals; means for taking the derivative of said first signals to determine actual engine acceleration and generating third signals indicative of that acceleration, including means for digital filtering of said first signals before taking the derivative and said third signals after taking the derivative in order to reduce errors in said third signals; means for creating acceleration error signals from said acceleration set point signals and said third signals; and means for applying control signals to said fuel servo valve which are a function of said acceleration error signals.
Claim 2
Dependent Claim
164 words
A control system for a gas turbine engine having a fuel servo valve controlling the flow of fuel to the engine combustor wherein operation of said fuel servo valve is controlled by engine acceleration error according to an apparatus comprising: means for sensing engine speed and providing first signals indicative of that speed; a source of second signals, indicating the desired engine speed; means for creating acceleration set point signals from said first and second signals; means for taking the derivative of said first signals to determine actual engine acceleration and generating third signals indicative of that acceleration, including means for digital filtering of said first signals before taking the derivative and said third signals after taking the derivative in order to reduce errors in said third signals; means for creating acceleration error signals from said acceleration set point signals and said third signals; and means for applying control signals to said fuel servo valve which are a function of said acceleration error signals.
Claim 3
Dependent Claim
38 words
The control system according to claim 1 wherein means are provided for receiving said acceleration error signals and modifying those signals at least in part according to environmental pressure and temperature in order to create said control signals.
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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) | 1997-11-07 | 1998-05-09 | 1998-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-07 | 2002-05-09 | 2002-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-07 | 2006-05-09 | 2006-11-08 | $7700.00 | Window Closed / Lapsed |