Patent AT117244B successfully refreshed from Google Patents.
US3554084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redundant force summing servo unit
Assignee: Honeywell Inc
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Filing: 1967-11-17
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Granted: 1971-01-12
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Expires: 1987-11-17
Abstract
Abstract The servosystem which will tolerate failure in two of its four redundant channels and still be operational consists of four identical redundant units. The force outputs of the four redundant units are summed together, by means of a summing link or member, with the resultant force on the member being applied to a control valve of a fluid operated motor which is a low resistive load. The input signal to each redundant unit is an electrical signal which energizes a torque motor. The torque motor responds by developing a force on its armature, which force is transmitted to a jet pipe valve. The jet pipe is deflected thereby causing a fluid pressure differential at the receiving holes coacting with the jet pipe nozzle. This pressure differential is transmitted to both a mod piston (which is the drive piston of the redundant unit) and the pressure sensor piston in parallel with the mod piston. The motion of both pistons is force fed back to the jet pipe by means of yieldable, impositive members as flat springs, thus closing two independent loops.
Inventors
- 👤 Robert F Rasmussen
- 👤 John C Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:30
CPC Classifications
F; F15; F15B; F15B9/00; F15B18/00; G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0077
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
The apparatus of claim 1 wherein operation of said controller in said further means modifies the flow rate by modifying the position of said member to provide long term equalization of fluid pressure in the passages to the power section.
Claim 2
Dependent Claim
119 words
In a fluid-type actuator having a power output section and a control section for porting fluid from a source of pressure fluid to said power section, said control section having a displaceable member to vary the flow rate to the power section and thus its displacement rate: first means for variably displacing said member from a normal position; second or feedback means operated from said power section to return said member to normal position; a pressure fluid conduit means in said control section and having an operable valve therein for transmitting fluid to said control section; and pressure fluid monitor means connected to said power section thus responsive to fluid pressure therein and controlling the operation of said valve.
Claim 3
Dependent Claim
54 words
The apparatus of claim 3 characterized by the valve being of the solenoid actuated type and the pressure fluid monitor means also includes a switch means having contacts controlling a circuit of said solenoid and responsive to pressure to said power means to effect opening of said valve to supply fluid to the conduit.
Claim 4
Dependent Claim
36 words
The apparatus of claim 4, in including a pressure monitoring start switch for momentarily energizing said solenoid to momentarily open the valve to passage of fluid to apply pressure to said power means and switch means.
Claim 5
Dependent Claim
123 words
The apparatus of claim 3, pluralized to provide at least three redundant actuators, and wherein each power section thereof is connected to a common force summing member, all power sections normally applying effects to an output of said summing member, whereby each feedback means is operated in accordance with the average position of the output from the summing member whereby failure to cause a first means in one section to initially displace a displaceable member in the section results in the feedback means repositioning said displaceable member in the section causing a larger than normal operating pressure thus a change in normal operating pressure to its power means with the accompanying operation of the pressure monitor means to terminate operation of said valve.
Claim 6
Dependent Claim
24 words
The apparatus of claim 6 wherein the first means displacing said member and the second feedback means thereof are structurally of the impositive type.
Claim 7
Dependent Claim
59 words
The apparatus of claim 7 wherein the power section includes a power piston and wherein the displaceable member controls the position of a nozzle or jet pipe which normally applies equal pressures to a pair of receiving ports or openings directly connected to opposite ends of the power piston of the power means to apply normally equal pressures thereto.
Claim 8
Dependent Claim
29 words
The apparatus of claim 7, including a pressure equalizer monitor responsive to time duration of fluid pressure applied to said power section and operatively connected to said displaceable member.
Claim 9
Dependent Claim
54 words
The apparatus of claim 3, characterized by the valve being of the solenoid actuated type and the pressure fluid monitor means also includes a switch means controlling a circuit of said solenoid and responsive to continued large displacements of said member from normal position opening said circuit to return the valve to closed position.
Claim 10
Dependent Claim
140 words
In control apparatus, means for operating a low resistive load output comprising: a plurality of redundant channels each having a piston type proportional operated fluid servomotor, all servomotors through their pistons operating a force summing common member connectable for operation to said output; first means displaceable for applying differential fluid pressure to said redundant servo motor pistons to effect operation thereof; second means responsive to excessive differential pressures in each servomotor operating a failure switch connected to the first means for terminating application of fluid pressure to said servomotor thus terminating operation of said servomotor; and a differential pressure responsive device in each channel connected through fluid flow restrictive conducting means to opposite sides of its associated piston to respond only to time duration differential pressures across said piston and connected to the first means to modify the displacement thereof.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |