US3811273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slaved fuel control for multi-engined aircraft
Assignee: RTX Corp
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Filing: 1973-03-08
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Granted: 1974-05-21
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Expires: 1993-03-08
Abstract
Abstract When a failure occurs in a fuel control for a turbine engine in a multi-engine aircraft, the fuel metering valve for the engine with the failed fuel control is connected to operate in a slaved mode in response to the control signal produced by the prime fuel control of one of the other aircraft engines. For slaved mode operation, the control signal produced by the prime fuel control is slightly attenuated and lag compensation is applied thereto before the control signal is fed to the fuel metering valve of the slaved engine in order to compensate for variations in engine characteristics and to provide additional safety margin.
Inventors
- 👤 A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:02
CPC Classifications
B; B64; B64D; B64D31/00; B64D31/02; B64D31/06; B64D31/12; F; F02; F02C; F02C9/00; F02C9/26; F02C9/42; F02C9/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
In an apParatus powered by a plurality of engines, each of said engines having associated therewith a fuel control unit producing a control signal for scheduling the flow of fuel to said engine, the improvement comprising switch means operable upon a malfunction in the fuel control unit of one of said engines for disabling the control signal therefrom, and means connected with said switch means for simultaneously connecting to said one engine the control signal from one of said other engine fuel control units.
Claim 2
Dependent Claim
84 words
In an apParatus powered by a plurality of engines, each of said engines having associated therewith a fuel control unit producing a control signal for scheduling the flow of fuel to said engine, the improvement comprising switch means operable upon a malfunction in the fuel control unit of one of said engines for disabling the control signal therefrom, and means connected with said switch means for simultaneously connecting to said one engine the control signal from one of said other engine fuel control units.
Claim 3
Dependent Claim
29 words
Apparatus as in claim 1 and including attenuator means connected in series with the control signal from said other fuel control unit for attenuating the said other control signal.
Claim 4
Dependent Claim
20 words
Apparatus as in claim 2 in which said attenuator means includes means for applying compensation to said other control signal.
Claim 5
Dependent Claim
16 words
Apparatus as in claim 3 in which said means for applying compensation includes a lag circuit.
Claim 6
Dependent Claim
17 words
Apparatus as in claim 1 in which said engines are gas turbine engines in a multi-engine aircraft.
Claim 7
Dependent Claim
99 words
A fuel control system comprising a first engine to which fuel is supplied through a metering valve, a first fuel control unit producing a first control signal for scheduling the position of said metering valve, a second engine having associated therewith a second fuel control unit producing a second control signal for scheduling the flow of fuel to said second engine, and switch means connected between said first fuel control unit and said fuel metering valve for disconnecting said first control signal from said fuel metering valve and connecting said fuel metering valve to receive said second control signal.
Claim 8
Dependent Claim
99 words
A fuel control system comprising a first engine to which fuel is supplied through a metering valve, a first fuel control unit producing a first control signal for scheduling the position of said metering valve, a second engine having associated therewith a second fuel control unit producing a second control signal for scheduling the flow of fuel to said second engine, and switch means connected between said first fuel control unit and said fuel metering valve for disconnecting said first control signal from said fuel metering valve and connecting said fuel metering valve to receive said second control signal.
Claim 9
Dependent Claim
26 words
Apparatus as in claim 6 and including attenuator means connected between said switch means and said second fuel control unit for attenuating said second control signal.
Claim 10
Dependent Claim
20 words
Apparatus as in claim 7 in which said attenuator means includes means for applying compensation to said second control signal.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |