US3974433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control apparatus with saturation element
Assignee: Hitachi Ltd
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Filing: 1974-10-15
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Granted: 1976-08-10
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Expires: 1994-10-15
Abstract
Abstract An automatic control apparatus comprises a means for detecting deviation of an actual value from a target value of a controlled quantity for the control operations and a damping feedback means, at least one of which means is provided with an element having a saturation characteristic. Predetermined relations are established between the input value to saturate the output of the detector means and the input value to saturate the output of the damping feedback means to thereby enhance mainly the response of operation for the control in one direction, while for the control operation in the other direction, stability is improved.
Inventors
- 👤 Takao Kuwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:10
CPC Classifications
F; F03; F03B; F03B15/00; F03B15/02; F03B15/04; F03B15/06; F03B15/08; G; G05; G05B; G05B5/00; G05B5/01; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
Automatic control apparatus provided with element having saturation characteristics, comprising a detector means for detecting deviation of an actual value from a target value, an amplifier means for receiving the output signal from said detector means at the input thereof to amplify said signal with integration to thereby produce a corresponding output signal, a feedback means for feeding back said output signal from said amplifier means through a damping feedback element and a rigid feedback element, a summing means for deriving the difference between the output signal of said detector means and said feedback means to feed the difference signal to said amplifier means, a control means to regulate a unit to be controlled in dependence upon said output signal of said amplifier means, and means for saturating the output signal of said damping feedback means only for the operation of said unit in either the opening or closing direction.
Claim 2
Dependent Claim
150 words
Automatic control apparatus provided with element having saturation characteristics, comprising a detector means for detecting deviation of an actual value from a target value, an amplifier means for receiving the output signal from said detector means at the input thereof to amplify said signal with integration to thereby produce a corresponding output signal, a feedback means for feeding back said output signal from said amplifier means through a damping feedback element and a rigid feedback element, a summing means for deriving the difference between the output signal of said detector means and said feedback means to feed the difference signal to said amplifier means, a control means to regulate a unit to be controlled in dependence upon said output signal of said amplifier means, and means for saturating the output signal of said damping feedback means only for the operation of said unit in either the opening or closing direction.
Claim 3
Dependent Claim
39 words
Automatic control apparatus with element having saturation characteristics according to claim 1, further comprising means for saturating the output signal of said damping feedback means only for the operation of said unit to be controlled in the closing direction.
Claim 4
Dependent Claim
109 words
Automatic control apparatus provided with element having saturation characteristics according to claim 1, wherein the output signal of said damping feedback means is adapted to be saturated both for the opening and the closing operations of said unit to be controlled, further comprising means for saturating the output signal of said detector means for the operation of said unit to be controlled either in the opening or closing direction, the value at which said output signal is saturated being selected to be smaller than a given value at which the output signal of said damping feedback means is saturated for the operation of said unit in the corresponding direction.
Claim 5
Dependent Claim
100 words
Automatic control apparatus according to claim 1, wherein the output signal of said damping feedback means is adapted to be saturated both for the opening and the closing operations of said unit to be controlled, further comprising means for saturating the output signal of said detector means for the operation of said unit to be controlled in the opening direction, the value at which said output signal is saturated being selected to be smaller than a given value at which the output signal of said damping feedback means is saturated for the operation of said unit in the opening direction.
Claim 6
Dependent Claim
51 words
Automatic control apparatus according to claim 1, wherein all of said detector means, amplifier means, feedback means, summing means and saturating means are composed of electrical means and said control means comprises a signal converter for converting the electric output signal of said amplifier means into a corresponding mechanical output signal.
Claim 7
Dependent Claim
29 words
Automatic control apparatus according to claim 1, wherein all of said detector means, amplifier means, feedback means, summing means, control means and saturating means are composed of mechanical means.
References Cited (Backward Citations)
US2901680A
Cited
US3046465A
Cited
US3201675A
Cited
US3510737A
Cited
US3419771A
Cited
US3424402A
Cited
US3701992A
Cited
US3758838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |