EP0417774A2
Expired / Lapsed
EP
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Feedback control system
Assignee: Toshiba Corp
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Filing: 1990-09-12
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Granted: —
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Expires: 2010-09-12
Abstract
Abstract A control computation unit (20) includes a delay element (31) in addition to an integrating element (22) and a proportional element (23). The delay time (ε -STd ) of this delay element is selected, following the time necessary for due settling (namely, the time required for rendering a controlled variable to follow changes in a control variable command), or the time necessary to restore the controlled variable to the control variable command when a controlled object involved has incurred a certain external disturbance. In case there exist a computation delay time, a dead time, and/or a detection delay time, respectively in the control computation unit (20), controlled system, and/or a control variable detector, then the delay time is selected equal to one of the computation delay time, dead time, and the detection delay time, or the sum of these times. Additional provision of the delay element (31) with a delay time equal to the time desired for due settling to the control computation unit (20) results in settling within the time equal to the time desired for due settling the response.
Inventors
- 👤 Ryoichi C/O Intellectual Property Div. Kurosawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:24
CPC Classifications
G; G05; G05B; G05B6/00; G05B6/02; G05B11/00; G05B11/01; G05B11/36; G05B11/42; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/921
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
A feedback control system which operates a controlled object (10) according to a manipulation variable command (ei), comprising: means (100) for detecting an amount of control for said controlled object (10) to provide a controlled variable (eo); means (21, 240) for controlling the amount of control for said controlled object (10) according to a control output (ec) representing a difference (Δe) between the controlled variable (eo) and the manipulation variable command (ei), such that the controlled variable (ec) approaches to the manipulation variable command (ei), wherein said controlling means (21, 240) has a transfer function F(s) containing a complex parameter s as a variable, and a degree of the complex parameter s, which is a denominator of an expression of the transfer function F(s), is equal to or more than a degree of the complex parameter s, which is a numerator of said expression; and means (31, 34) for combining the control output (ec) with a delay signal (ey) which is obtained by delaying the controlled variable (eo) by a predetermined time (Tc).
Claim 2
Dependent Claim
173 words
A feedback control system which operates a controlled object (10) according to a manipulation variable command (ei), comprising: means (100) for detecting an amount of control for said controlled object (10) to provide a controlled variable (eo); means (21, 240) for controlling the amount of control for said controlled object (10) according to a control output (ec) representing a difference (Δe) between the controlled variable (eo) and the manipulation variable command (ei), such that the controlled variable (ec) approaches to the manipulation variable command (ei), wherein said controlling means (21, 240) has a transfer function F(s) containing a complex parameter s as a variable, and a degree of the complex parameter s, which is a denominator of an expression of the transfer function F(s), is equal to or more than a degree of the complex parameter s, which is a numerator of said expression; and means (31, 34) for combining the control output (ec) with a delay signal (ey) which is obtained by delaying the controlled variable (eo) by a predetermined time (Tc).
Claim 3
Dependent Claim
32 words
The feedback control system according to claim 1, characterized in that said controlling means (240, 22, 23 in Fig. 2) includes at least one of proportional elements (Kp) and integrating elements (Ki/s).
Claim 4
Dependent Claim
30 words
The feedback control system according to claim 1 or 2, characterized in that said combining means (31, 34) has a transfer function including any element other than a differentiating element.
Claim 5
Dependent Claim
40 words
The feedback control system according to claim 1, 2 or 3, characterized in that said predetermined time (Tc) represents time necessary for the amount of control for said controlled object (10) to follow changes in the manipulation variable command (ei).
Claim 6
Dependent Claim
49 words
The feedback control system according to claim 1, 2 or 3, characterized in that said predetermined time (Tc) represents time necessary for restoring the controlled variable (eo), which has varied due to an external disturbance (ed) imposed on said controlled object (10), to the manipulation control variable command (ei).
Claim 7
Dependent Claim
31 words
The feedback control system according to claim 1, 2 or 3, characterized in that said predetermined time (Tc) is time necessary to achieve the control performed by said controlling means (240).
Claim 8
Dependent Claim
45 words
The feedback control system according to claim 1, 2 or 3, characterized in that said predetermined time (Tc) includes time corresponding to a delay (ε -STd* ) in the response of an output of said controlled object (10) with respect to said control output (ec).
Claim 9
Dependent Claim
36 words
The feedback control system according to claim 7, characterized in that said predetermined time (Tc) includes time corresponding to the delay of the response of said controlled variable (eo) with respect to said control output (ec).
Claim 10
Dependent Claim
62 words
The feedback control system according to claim 1, 2 or 3, characterized in that said predetermined time (Tc) includes time corresponding to a period of sampling a signal (e35) in the case where said controlling means (240) includes a configuration of sampled data control which provides said control output (ec), following the signal (e35) obtained by sampling said manipulation variable command (ei).
Claim 11
Dependent Claim
59 words
The feedback control system according to any one of claims 1 to 9, further comprising: means (32) for transforming said delay signal (ey) into a different signal (e32); and means (33) for feeding, in place of said controlled variable (eo), a difference (ex) between said controlled variable (co) and said different signal (e32) to said combining means (31, 34).
References Cited (Backward Citations)
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