US3937014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric control circuit arrangements for gas turbine engines
Assignee: ZF International UK Ltd
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Filing: 1974-10-30
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Granted: 1976-02-10
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Expires: 1994-10-30
Abstract
Abstract A control circuit arrangement for a gas turbine engine has first and second identical control circuits which are responsive to groups of input signals to provide nominally identical first and second output signals. It is arranged that input signals to the first control circuit are nominally identical with corresponding input signals to the second control circuit. Means are provided, responsive to malfunction of either one of the first and second control circuits, to render the malfunctioning circuit inoperative and to render the other of the control circuits operative. A third control circuit is responsive to at least one pair of corresponding input signals to the first and second circuits, to provide a third output signal to the engine. The first, second and third output signals do not control the engine reheat system, and the arrangement may include a fourth control circuit for controlling this reheat system.
Inventors
- 👤 Anthony Brian Plant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:42
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
An electric control circuit arrangement for a gas turbine engine, comprising a first control circuit responsive to a plurality of first input signals to provide first output control signals, a second control circuit responsive to a plurality of second input signals to provide second output control signals which are nominally identical with said first output control signals, corresponding ones of said first and second input signals being nominally indentical, a third control circuit responsive to at least one of said input signals to provide a third output control signal, and selector means for rendering either said first or said second control circuit operative, said selector means being responsive to malfunction of either one of said first and second control circuits to render the malfunctioning one of said circuits inoperative and to render the other of said circuits operative.
Claim 2
Dependent Claim
138 words
An electric control circuit arrangement for a gas turbine engine, comprising a first control circuit responsive to a plurality of first input signals to provide first output control signals, a second control circuit responsive to a plurality of second input signals to provide second output control signals which are nominally identical with said first output control signals, corresponding ones of said first and second input signals being nominally indentical, a third control circuit responsive to at least one of said input signals to provide a third output control signal, and selector means for rendering either said first or said second control circuit operative, said selector means being responsive to malfunction of either one of said first and second control circuits to render the malfunctioning one of said circuits inoperative and to render the other of said circuits operative.
Claim 3
Dependent Claim
33 words
An arrangement as claimed in claim 1 in which said third control circuit is responsive both to one of said first input signals and to a corresponding one of said second input signals.
Claim 4
Dependent Claim
37 words
An arrangement as claimed in claim 1 in which said one input signal is applied to said third control circuit via the one of said first or second control circuits which is, for the time being operative.
Claim 5
Dependent Claim
172 words
An electric control circuit arrangement for a gas turbine engine, comprising a first control circuit responsive to a plurality of first input signals to provide first output control signals, a second control circuit responsive to a plurality of second input signals to provide second output control signals which are nominally identical with said first output control signals, corresponding ones of said first and second input signals being nominally identical, a third control circuit responsive to at least one of said input signals to provide a third output control signal and also being responsive to a plurality of nominally identical third input signals to provide a fourth output control signal, said first and second control circuits also being responsive to said fourth output signal, and selector means for rendering either said first or said second control circuit operative, said selector means being responsive to malfunction of either one of said first and second control circuits to render the malfunctioning one of said circuits inoperative and to render the other of said circuits operative.
Claim 6
Dependent Claim
172 words
An electric control circuit arrangement for a gas turbine engine, comprising a first control circuit responsive to a plurality of first input signals to provide first output control signals, a second control circuit responsive to a plurality of second input signals to provide second output control signals which are nominally identical with said first output control signals, corresponding ones of said first and second input signals being nominally identical, a third control circuit responsive to at least one of said input signals to provide a third output control signal and also being responsive to a plurality of nominally identical third input signals to provide a fourth output control signal, said first and second control circuits also being responsive to said fourth output signal, and selector means for rendering either said first or said second control circuit operative, said selector means being responsive to malfunction of either one of said first and second control circuits to render the malfunctioning one of said circuits inoperative and to render the other of said circuits operative.
Claim 7
Dependent Claim
76 words
An arrangement as claimed in claim 4 in which said first and second circuits include means for generating respective fifth and sixth output signals which are respective functions of selected ones of said first and second input signals and in which said third control circuit includes means, responsive to said one input signal, to said fourth output signal and to a selected one of said fifth or sixth output signals, for generating a seventh output signal.
Claim 8
Dependent Claim
25 words
An arranagement as claimed in claim 4 which includes a fourth control circuit for generating a control signal for a reheat system of said engine.
References Cited (Backward Citations)
US3255586A
Cited
US3834361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |