US3636411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control logic switching for an on-off controller
Assignee: Bendix Corp
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Filing: 1968-05-28
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Granted: 1972-01-18
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Expires: 1988-05-28
Abstract
Abstract A switching device for an on-off controller. A signal corresponding to the desired value of a controlled variable is compared with an actual value signal for providing an error signal. The error signal, upon exceeding a predetermined threshold, is gated through normally closed signal switches for opening power switches to interrupt power to the controller. An error rate signal, upon exceeding a predetermined threshold, is gated to the signal switches for opening said switches whereupon the power switches are closed to apply power to the controller.
Inventors
- 👤 James E Bulloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:04
CPC Classifications
B; B64; B64G; B64G1/00; B64G1/22; B64G1/24; B64G1/36; B64G1/244
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
Switching apparatus for a controller, operated by an output from a power supply comprising: means for providing a signal corresponding to a desired value of a controlled variable; means for providing a signal corresponding to the actual value of the controlled variable; means connected to the desired value signal means and to the actual value signal means for summing the signals therefrom and for providing an error signal; means for providing a signal corresponding to the rate of change of the error signal; means connecting the power supply to the controller and connected to the error signal means, and responsive to the error signal above a predetermined threshold for interrupting power from the power supply to the controller; and means connected to the rate of change signal means and to the last-mentioned means and responsive to the rate of change signal above a predetermined threshold for affecting said lastmentioned means to apply power from the power supply to the controller.
Claim 2
Dependent Claim
160 words
Switching apparatus for a controller, operated by an output from a power supply comprising: means for providing a signal corresponding to a desired value of a controlled variable; means for providing a signal corresponding to the actual value of the controlled variable; means connected to the desired value signal means and to the actual value signal means for summing the signals therefrom and for providing an error signal; means for providing a signal corresponding to the rate of change of the error signal; means connecting the power supply to the controller and connected to the error signal means, and responsive to the error signal above a predetermined threshold for interrupting power from the power supply to the controller; and means connected to the rate of change signal means and to the last-mentioned means and responsive to the rate of change signal above a predetermined threshold for affecting said lastmentioned means to apply power from the power supply to the controller.
Claim 3
Dependent Claim
67 words
Apparatus as described by claim 1, wherein the means for providing a signal corresponding to rate of change of the error signal includes: a lead network having an input connected to the error signal means and an output; and summing means connected to the error signal means and to the output of the lead network for summing the signals therefrom to provide the rate of change signal.
Claim 4
Dependent Claim
125 words
Apparatus as described by claim 1, wherein the means connecting the power supply to the controller and connected to the error signal means, and responsive to the error signal above a predetermined threshold for interrupting power from the power supply to the controller includes: a first threshold circuit connected to the error signal means, and responsive to the error signal above a predetermined threshold for providing a first controlling output; first gating means connected to the first threshold circuit and responsive to the first controlling output therefrom for providing a first energizing output; and first switching means connecting the power supply to the controller and connected to the first gating means, and responsive to the first energizing output therefrom for interrupting power to the controller.
Claim 5
Dependent Claim
148 words
Apparatus as described by claim 3, wherein the means connected to the rate of change signal means and to the last-mentioned means, and responsive to the rate of change signal above a predetermined threshold for affecting said last-mentioned means to apply power from the power supply to the controller includes: a second threshold circuit connected to the rate of change signal means and responsive to the rate of change signal above a predetermined threshold for providing a second controlling output; second gating means connected to the second threshold circuit and responsive to the second controlling output therefrom for providing a second energizing output; and second switching means connected to the first switching means anD to the second gating means and responsive to the second energizing output from said second gating means for rendering said first switching means effective to apply power from the power supply to the controller.
Claim 6
Dependent Claim
85 words
Apparatus as described by claim 3, wherein the first switching means includes: a normally closed first switch connected to the first gating means; a first relay connected to the first switch; a second switch connecting the power supply to the controller and being part of the first relay; and the energizing output from the first gating means being applied through the normally closed first switch for energizing the first relay to open the second switch thereby interrupting power from the power supply to the controller.
Claim 7
Dependent Claim
69 words
Apparatus as described by claim 5, wherein the second switching means includes: a second relay connected to the second gating means and connected to the normally closed first switch, and energized by the second energizing output from the second gating means for opening said normally closed first switch whereupon the first relay is deenergized for closing the second switch to apply power from the power supply to the controller.
Claim 8
Dependent Claim
60 words
Apparatus as described by claim 3, wherein: the first gating means is sign selective and provides the first energizing output in one sense when the first controlling output is above the predetermined threshold in the one sense, and provides the first energizing output in another sense when the first controlling output is above the predetermined threshold in the other sense.
Claim 9
Dependent Claim
60 words
Apparatus as described by claim 4, wherein: the second gating means is sign selective and provides the second energizing output in one sense when the second controlling output is above the predetermined threshold in the one sense, and provides the second energizing output in another sense when the second controlling output is above the predetermined threshold in the other sense.
Claim 10
Dependent Claim
55 words
Apparatus as described by claim 3, including: summing means connected to the difference signal means and to the rate of change signal means for summing the signals therefrom; and the first threshold circuit being connected to said summing means and responsive to the signal therefrom above the predetermined threshold for providing the first controlling output.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |