US3643073A
Expired / Lapsed
US
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Transfer function monitoring apparatus
Assignee: Honeywell Inc
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Filing: 1967-09-18
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Granted: 1972-02-15
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Expires: 1987-09-18
Abstract
Abstract A sensitive control system monitor for control systems using band rejection or notch filters. An inverse notch filter reconstructs the input signal to the notch filter and a comparator measures the difference between a lagged input signal and the reconstructed input signal to provide a logic output when the time rate of change of the input signal exceeds a predetermined threshold.
Inventors
- 👤 Robert T Sawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/62; G06G7/623; G05; G05B; G05B23/00; G05B23/02; G05D; G05D1/00; G05D1/0055; G05D1/0066
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
Apparatus of the class described comprising: condition control means having a first transfer function and receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function, said condition control means including at least one notch filter; filter means having a second transfer function equal to the inverse of the first transfer function, receiving a signal indicative of the output of said condition control means and producing an output in accordance with the second transfer function; and comparator means receiving the output of said filter means and the input signal to said condition control means, and providing an output indicative of the difference between the first transfer function and the second transfer function.
Claim 2
Dependent Claim
121 words
Apparatus of the class described comprising: condition control means having a first transfer function and receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function, said condition control means including at least one notch filter; filter means having a second transfer function equal to the inverse of the first transfer function, receiving a signal indicative of the output of said condition control means and producing an output in accordance with the second transfer function; and comparator means receiving the output of said filter means and the input signal to said condition control means, and providing an output indicative of the difference between the first transfer function and the second transfer function.
Claim 3
Dependent Claim
35 words
Apparatus of the class described in claim 1 and level detector means receiving the output of the comparator means and producing a logic indication when the output of the comparator means exceeds a predetermined level.
Claim 4
Dependent Claim
221 words
Apparatus of the class described, comprising: condition control means having a fIrst transfer function and receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with the second transfer function; second filter means having a predetermined transfer function and receiving an input signal representative of the control condition and producing an output in accordance with the predetermined transfer function; first comparator means receiving the output of said first filter means and the input signal to said condition control means, providing an output indicating the percentage change of the first transfer function; second comparator means receiving the output of said second filter means and the input signal to said condition control means, said second comparator means providing an output equal to the difference between the input signal to said condition control means and the output signal of said second filter means; and means receiving the output of said first comparator means and said second comparator means and producing a logic output when the output of said first comparator means or the output of said second comparator means exceeds a predetermined level.
Claim 5
Dependent Claim
221 words
Apparatus of the class described, comprising: condition control means having a fIrst transfer function and receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with the second transfer function; second filter means having a predetermined transfer function and receiving an input signal representative of the control condition and producing an output in accordance with the predetermined transfer function; first comparator means receiving the output of said first filter means and the input signal to said condition control means, providing an output indicating the percentage change of the first transfer function; second comparator means receiving the output of said second filter means and the input signal to said condition control means, said second comparator means providing an output equal to the difference between the input signal to said condition control means and the output signal of said second filter means; and means receiving the output of said first comparator means and said second comparator means and producing a logic output when the output of said first comparator means or the output of said second comparator means exceeds a predetermined level.
Claim 6
Dependent Claim
153 words
Apparatus of the class described, comprising: condition control means having a first transfer function and receiving an input signal representative of a controlled condition and producing an output in accordance with the first transfer function; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with the second transfer function; second filter means having a third transfer function, receiving an input signal from the output of said first filter means and producing an output signal determined by the input signal and a third transfer function; and comparator means receiving the output of said second filter means and the input signal to said condition control means, said comparator means providing an output equal to the difference between the input signal to said condition control means and the output of said second filter means.
Claim 7
Dependent Claim
153 words
Apparatus of the class described, comprising: condition control means having a first transfer function and receiving an input signal representative of a controlled condition and producing an output in accordance with the first transfer function; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with the second transfer function; second filter means having a third transfer function, receiving an input signal from the output of said first filter means and producing an output signal determined by the input signal and a third transfer function; and comparator means receiving the output of said second filter means and the input signal to said condition control means, said comparator means providing an output equal to the difference between the input signal to said condition control means and the output of said second filter means.
Claim 8
Dependent Claim
48 words
Apparatus of the class described in claim 4 wherein the second filter means is a simple lag network causing the output of the comparator means to be indicative of the rate of change at the input signal and the percentage difference between the first and second transfer functions.
Claim 9
Dependent Claim
158 words
In a control system for a steerable craft, an acceleration limit and inverse filter monitor, comprising: condition control means having a first transfer function and receiving an input signal indicative of the rate of turn of the craft, producing an output in accordance with the first transfer function and the input signal; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with said second transfer function; second filter means having a third transfer function, receiving an input signal from the output of said second filter means and producing an output signal determined by the input signal and the third transfer function; and comparator means receiving the output of said second filter means and the input signal to said condition control means providing an output indicative of the g-level and the performance of the condition control means.
Claim 10
Dependent Claim
158 words
In a control system for a steerable craft, an acceleration limit and inverse filter monitor, comprising: condition control means having a first transfer function and receiving an input signal indicative of the rate of turn of the craft, producing an output in accordance with the first transfer function and the input signal; first filter means having a second transfer function equal to the inverse of the first transfer function, receiving the output of said condition control means and producing an output in accordance with said second transfer function; second filter means having a third transfer function, receiving an input signal from the output of said second filter means and producing an output signal determined by the input signal and the third transfer function; and comparator means receiving the output of said second filter means and the input signal to said condition control means providing an output indicative of the g-level and the performance of the condition control means.
Claim 11
Dependent Claim
39 words
Apparatus of the class described in claim 6 wherein the output of the comparator means is connected to a level detector and a warning output signal is transmitted when the output of said comparator means exceeds a predetermined level.
Claim 12
Dependent Claim
18 words
Apparatus of the class described in claim 7 wherein the second filter means is a sImple lag network.
Claim 13
Dependent Claim
19 words
Apparatus of the class described in claim 8 wherein the condition control means incorporates at least one notch filter.
Claim 14
Dependent Claim
129 words
Apparatus of the class described, comprising: condition control means having a first transfer function, receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function; filter means having a second transfer function equal to the inverse of the first transfer function, and having a simple lag third transfer function, said filter means receiving the output of said condition control means and producing an output primarily indicative of the input signal and the third transfer function; and comparator means receiving the output of said filter means and the input signal to said condition control means, said comparator means providing an output equal to the difference between the input signal to said condition control means and the output of said filter means.
Claim 15
Dependent Claim
129 words
Apparatus of the class described, comprising: condition control means having a first transfer function, receiving an input signal representative of a control condition and producing an output in accordance with the first transfer function; filter means having a second transfer function equal to the inverse of the first transfer function, and having a simple lag third transfer function, said filter means receiving the output of said condition control means and producing an output primarily indicative of the input signal and the third transfer function; and comparator means receiving the output of said filter means and the input signal to said condition control means, said comparator means providing an output equal to the difference between the input signal to said condition control means and the output of said filter means.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |