Patent US3603948A successfully refreshed from Google Patents.
US3603948A
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Fault identification, isolation and display for use with an aircraft control system
Assignee: Bendix Corp
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Filing: 1968-11-22
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Granted: 1971-09-07
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Expires: 1988-11-22
Abstract
Abstract A fault identification, isolation and display device for testing an aircraft control system. The device senses malfunctions in selected portions of the system and provides a visual display which instantaneously identifies and isolates the malfunctioning section and memorizes the fault status of the section until the device is manually or automatically reset.
Inventors
- 👤 William W Medlinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:50
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/081; G01R31/086; G06; G06F; G06F11/00; G06F11/22; G06F11/26; G06F11/273
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
256 words
Test apparatus for a control system having at least two sections, each of which provides a pair of redundant signals, comprising: at least two comparators, each of which is connected to a corresponding control system section for comparing the redundant signals therefrom and for providing an output corresponding to the difference therebetween; means for providing a control system engage signal; gating means connected to the control system engage signal means and to the comparators and responsive to the system engage signal and the outputs from the comparators for providing a signal at one logic level when the outputs are below a predetermined level and for providing a signal at another logic level when at least one of said outputs is above the predetermined level; first switching means connected to the gating means, to the system engage signal means and to the control system, and responsive to the gating means output at the one logic level for applying the system engage signal to the control system to engage the system, and responsive to the gating means output at the other logic level for removing the system engage signal from the control system to disengage the system; means for providing test signals; and signal applying means connected to the system engage signal means, to the comparators and to the test signal means, and responsive to the system engage signal when the control system is initially engaged for applying the test signals to and for removing the test signals from the comparators in accordance with a predetermined test sequence.
Claim 2
Dependent Claim
256 words
Test apparatus for a control system having at least two sections, each of which provides a pair of redundant signals, comprising: at least two comparators, each of which is connected to a corresponding control system section for comparing the redundant signals therefrom and for providing an output corresponding to the difference therebetween; means for providing a control system engage signal; gating means connected to the control system engage signal means and to the comparators and responsive to the system engage signal and the outputs from the comparators for providing a signal at one logic level when the outputs are below a predetermined level and for providing a signal at another logic level when at least one of said outputs is above the predetermined level; first switching means connected to the gating means, to the system engage signal means and to the control system, and responsive to the gating means output at the one logic level for applying the system engage signal to the control system to engage the system, and responsive to the gating means output at the other logic level for removing the system engage signal from the control system to disengage the system; means for providing test signals; and signal applying means connected to the system engage signal means, to the comparators and to the test signal means, and responsive to the system engage signal when the control system is initially engaged for applying the test signals to and for removing the test signals from the comparators in accordance with a predetermined test sequence.
Claim 3
Dependent Claim
50 words
Test apparatus as described by claim 1, including: means connected to the system engage signal means and to the signal applying means for rendering the signal applying means unresponsive to the system engage signal when the test sequence is completed so as to inhibit operation of said signal applying means.
Claim 4
Dependent Claim
29 words
Test apparatus as described by claim 1, including: indicating means connected to the comparators and responsive to the one output above the predetermined level for indicating a system failure.
Claim 5
Dependent Claim
100 words
Test apparatus as described by claim 3, including: second switching means connected to the system engage signal means, the comparators and the signal applying means; said second switching means responsive to the outputs from the comparators below the predetermined level for applying the system engage signal to the signal applying means, and responsive to the one comparator output above the predetermined level for removing the system engage signal from the signal applying means; and the signal applying means being effective to advance a step in the test sequence each time the system engage signal is applied thereto and removed therefrom.
Claim 6
Dependent Claim
98 words
Test apparatus as described by claim 4, including: a counter; third switching means manually operable for connecting the counter intermediate the signal applying means and the second switching means; the third switching means being operable for applying and removing the system engage signal to and from the counter each time said signal is applied to and removed from the signal applying means by the second switching means; and the counter being effective to advance a step in the test sequence each time the system engage signal is applied thereto and removed therefrom, and to indicate said test step.
Claim 7
Dependent Claim
78 words
Test apparatus as described by claim 5, including: means for providing a reset signal; fourth switching means manually operable for connecting the reset signal means to the indicating means; fifth switching means connected to the system engage signal means and connected intermediate the fourth switching means and the indicating means; and said fifth switching means being responsive to the system engage signal for applying the reset signal to the indicating means when the fourth switching means is operated.
Claim 8
Dependent Claim
74 words
Test apparatus as described by claim 6, wherein: the fourth switching means is manually operable for connecting the reset signal means to the counter; the fifth switching means is connected to the system engage signal means and is connected intermediate the fourth switching means and the counter; and said fifth switching means is responsive to the system engage signal for applying the reset signal to the counter when the fourth switching means is operated.
Claim 9
Dependent Claim
47 words
Test apparatus as described by claim 3, including: sixth switching means connected intermediate the comparators and the indicating means and connected to the signal applying means; and said sixth switching means being effective upon completion of the test sequence for disconnecting the comparators from the indicating 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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |