Isochronous gas turbine speed control
First Claim
1. 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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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.
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Citations
1 Claim
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1. 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:
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(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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Specification
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- Resources
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Current AssigneeGeneral Electric Company
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Original AssigneeGeneral Electric Company
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InventorsPisano, Alan D.
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Primary Examiner(s)Casaregola, Louis J.
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Application NumberUS06/722,035Time in Patent Office796 DaysField of Search60/39.02, 60/39.03, 60/39.281US Class Current60/773CPC Class CodesF02C 9/28 Regulating systems responsi...F05D 2270/04 to control acceleration (u)
