US3559665A
Expired / Lapsed
US
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Control systems
Assignee: British Telecommunications Research Ltd
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Filing: 1968-11-12
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Granted: 1971-02-02
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Expires: 1988-11-12
Abstract
Abstract A control system for exercising a control in dependence upon the function where N is a rotational speed and T is a fluid temperature in which first and second pulses are produced whose timing is dependent on the rotational speed. The first pulse is transmitted through a delay line containing fluid at the temperature T and compared in a comparator with the second pulses. The output from the comparator is used as a feed back signal to bring the two pulses into coincidence.
Inventors
- 👤 John Christopher Hammond Davis
- 👤 Guy Edward Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:21
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; F01; F01D; F01D17/00; F01D17/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0777; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147; Y10T137/2158
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
Apparatus for exercising a control in dependence on a function comprising the product of frequency and the reciprocal of the square root of a temperature, said apparatus comprising means for supplying a stream of fluid at said temperature; means for generating a first fluid pulse in said stream of fluid at a time determined by said frequency; a comparator having first, second and third output states; a fluid delay line for continuously transmitting said stream of fluid to said comparator, means for supplying to said comparator; a second fluid pulse whose timing is determined by said frequency; and actuator means responsive to said comparator for increasing a variable affecting at least one of the group comprising said temperature, the geometry of the apparatus and said frequency when said comparator is in its first output state, decreasing said variable when said comparator is in its second output state and leaving said variable unaltered when said comparator is in its third output state, whereby the compared pulses can be brought into time coincidence.
Claim 2
Dependent Claim
171 words
Apparatus for exercising a control in dependence on a function comprising the product of frequency and the reciprocal of the square root of a temperature, said apparatus comprising means for supplying a stream of fluid at said temperature; means for generating a first fluid pulse in said stream of fluid at a time determined by said frequency; a comparator having first, second and third output states; a fluid delay line for continuously transmitting said stream of fluid to said comparator, means for supplying to said comparator; a second fluid pulse whose timing is determined by said frequency; and actuator means responsive to said comparator for increasing a variable affecting at least one of the group comprising said temperature, the geometry of the apparatus and said frequency when said comparator is in its first output state, decreasing said variable when said comparator is in its second output state and leaving said variable unaltered when said comparator is in its third output state, whereby the compared pulses can be brought into time coincidence.
Claim 3
Dependent Claim
49 words
Apparatus as claimed in claim 1, in which the means for generating the first and second fluid pulses comprises a disc arranged to rotate at a speed proportional to said frequency, to allow passage of fluid when in predetermined orientations and to inhibit passage of fluid in other orientations.
Claim 4
Dependent Claim
45 words
Apparatus as claimed in claim 2, in which the actuator means is arranged to vary the relative angular disposition round the axis of rotation of the disc of the means for generating the first fluid pulse and the means for generating the second fluid pulse.
Claim 5
Dependent Claim
62 words
Apparatus as claimed in claim 2, in which the means for generating the second pulse includes a nozzle arranged to direct fluid onto the disc, a collector aligned with the nozzle on the other side of the disc and a slot in the disc at the same radial distance as the nozzle and collector from the axis of rotation of the disc.
Claim 6
Dependent Claim
68 words
Apparatus as claimed in claim 2 in which the means for generating the first pulse includes an exhaust at the end of the delay line confronting the disc and a protuberance on the disc at the same radial distance from the axis of rotation of the disc as the exhaust and the arrangement being such that the exhaust is choked except when the protuberance is in alignment therewith.
Claim 7
Dependent Claim
94 words
Apparatus as claimed in claim 5, in which the comparator comprises a pair of biased bistable fluidic devIces a first one of which is arranged to produce an output signal if the leading edge of the second pulse is received more than a predetermined time after the leading edge of the first pulse but before the end of the first pulse and the other of which is arranged to produce an output signal if the leading edge of the second pulse is received more than a predetermined time before that of the first pulse.
Claim 8
Dependent Claim
53 words
Apparatus as claimed in claim 6, in which each of said output signals from the first and second bistable devices is operative to actuate the supply of fluid to a respective side of a diaphragm valve and a switching arrangement is provided for equalizing the pressure across the diaphragm when such output ceases.
Claim 9
Dependent Claim
79 words
Apparatus as claimed in claim 6, in which the comparator includes a third bistable device having an input connected to the delay line nearer to the exhaust then the first and second bistable devices and arranged to produce an output if the trailing edge of the first pulse has passed before the leading edge of the second pulse is received, said output signal being arranged to produce the same effect as said output signal from said first bistable device.
Claim 10
Dependent Claim
54 words
Apparatus as claimed in claim 6, including an auxiliary delay line arranged to be supplied with fluid from the same source as that supplied to the first mentioned delay line and having inputs to the bistable device so connected thereto that identical signals from the two delay lines oppose one another in the comparator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |