US4672806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isochronous gas turbine speed control
Assignee: General Electric Co
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Filing: 1985-04-11
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Granted: 1987-06-16
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Expires: 2005-04-11
Abstract
Abstract An invention is disclosed in which a signal indicating a rate of fuel flow desired for a gas turbine engine is bounded between limits imposed by maximal- and minimal-fuel rates allowed under the current operating conditions of the engine and between limits imposed by maximal- and minimal-accelerations allowed under the same operating conditions. The fuel rate limits are constantly modified by feedback information about the actual acceleration experienced by the engine. This feedback information about acceleration is obtained without directly measuring acceleration itself.
Inventors
- 👤 Alan D. Pisano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:12
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
Method of driving a controlled variable, which is indicative of the rate of fuel presently being delivered to a gas turbine engine, to a desired value in response to an input signal, comprising the steps of: (a) processing the input signal to produce a processed signal having a value within a predetermined range; (b) generating a preliminary output signal having a time derivative substantially equal to the value of the processed signal; (c) subtracting from the input signal a signal derived from the preliminary output signal; (d) subtracting from the preliminary output signal a signal derived from the controlled variable; (e) modifying the predetermined range of (a) in accordance with the subtracted preliminary output signal of (d); (f) generating an output signal having a time derivative which is a function of the preliminary output signal after the subtraction of (d); and, (g) modifying the controlled variable in accordance with the output signal.
Claim 2
Dependent Claim
152 words
Method of driving a controlled variable, which is indicative of the rate of fuel presently being delivered to a gas turbine engine, to a desired value in response to an input signal, comprising the steps of: (a) processing the input signal to produce a processed signal having a value within a predetermined range; (b) generating a preliminary output signal having a time derivative substantially equal to the value of the processed signal; (c) subtracting from the input signal a signal derived from the preliminary output signal; (d) subtracting from the preliminary output signal a signal derived from the controlled variable; (e) modifying the predetermined range of (a) in accordance with the subtracted preliminary output signal of (d); (f) generating an output signal having a time derivative which is a function of the preliminary output signal after the subtraction of (d); and, (g) modifying the controlled variable in accordance with the output signal.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |