US3659173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft control system including limiting means
Assignee: Bendix Corp
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Filing: 1970-06-19
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Granted: 1972-04-25
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Expires: 1990-06-19
Abstract
Abstract A feedback system for controlling an aircraft as a function of a primary flight parameter and including limiting means whereby a secondary flight parameter becomes the controlling feedback parameter.
Inventors
- 👤 George H Pfersch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:59
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A control system comprising: first sensing means for providing a signal corresponding to a primary condition; a signal source for providing a primary condition command signal; second sensing means for providing a signal corresponding to a secondary condition; means connected to the signal source and to the second sensing means for combining the command signal and the secondary condition signal; means connected to the combining means for limiting the combined signal; means connected to the limiter and to the second sensing means for combining the limited signal and the secondary condition signal; means connected to the last mentioned combining means and to the first mentioned sensing means for combining the signals therefrom and for providing a control signal; and means responsive to the control signal for affecting control.
Claim 2
Dependent Claim
128 words
A control system comprising: first sensing means for providing a signal corresponding to a primary condition; a signal source for providing a primary condition command signal; second sensing means for providing a signal corresponding to a secondary condition; means connected to the signal source and to the second sensing means for combining the command signal and the secondary condition signal; means connected to the combining means for limiting the combined signal; means connected to the limiter and to the second sensing means for combining the limited signal and the secondary condition signal; means connected to the last mentioned combining means and to the first mentioned sensing means for combining the signals therefrom and for providing a control signal; and means responsive to the control signal for affecting control.
Claim 3
Dependent Claim
151 words
An aircraft control system comprising: means for providing a pitch rate signal; means for providing a normal acceleration signal; means for providing an angle of attack signal; means for providing a signal corresponding to a commanded sum of pitch rate and normal acceleration; means for adding the angle of attack signal and the command signal; a limiter connected to the adding means for limiting the signal therefrom; means connected to the angle of attack signal means and to the limiter for subtracting the signals therefrom; means connected to the pitch rate signal means and to the normal acceleration signal means for adding the signals therefrom; means connected to the subtracting means and to the last mentioned adding means for subtracting the signals therefrom and for providing a control signal; and means connected to the control signal means and to the aircraft for controlling the craft in response to the control signal.
Claim 4
Dependent Claim
151 words
An aircraft control system comprising: means for providing a pitch rate signal; means for providing a normal acceleration signal; means for providing an angle of attack signal; means for providing a signal corresponding to a commanded sum of pitch rate and normal acceleration; means for adding the angle of attack signal and the command signal; a limiter connected to the adding means for limiting the signal therefrom; means connected to the angle of attack signal means and to the limiter for subtracting the signals therefrom; means connected to the pitch rate signal means and to the normal acceleration signal means for adding the signals therefrom; means connected to the subtracting means and to the last mentioned adding means for subtracting the signals therefrom and for providing a control signal; and means connected to the control signal means and to the aircraft for controlling the craft in response to the control signal.
Claim 5
Dependent Claim
74 words
A control system as described by claim 1 wherein the system controls an aircraft and the means for providing a signal corresponding to a primary condition includes: means for providing a signal corresponding to the pitch rate of the craft; means for providing a signal corresponding to the normal acceleration of the craft; and means connected to the pitch rate signal means and to the normal acceleration signal means for adding the signals therefrom.
Claim 6
Dependent Claim
29 words
A control system as described by claim 3, wherein: the means for providing a signal corresponding to a secondary condition includes means for providing an angle of attack signal.
Claim 7
Dependent Claim
52 words
A system as described by claim 4 wherein the means connected to the primary condition command signal means and the secondary condition signal means for combining the signals therefrom includes: means connected to the command signal means and means connected to the angle of attack signal means for adding the signals therefrom.
Claim 8
Dependent Claim
46 words
A control system as described by claim 5 wherein the means connected to the limiter and to the secondary condition signal means for combining the signals therefrom includes: means connected to the limiter and to the angle of attack signal means for subtracting the signals therefrom.
Claim 9
Dependent Claim
78 words
A control system as described by claim 6 wherein the means connected to the last mentioned means and to the primary condition signal means for combining the signals therefrom and for providing a control signal includes: means connected to the means for subtracting the limited signal and the angle of attack signal and connected to the means for adding the pitch rate signal and the normal acceleration signal for subtracting the signals from said subtracting and adding means.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |