US4864490A
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Auto-tuning controller using fuzzy reasoning to obtain optimum control parameters
Assignee: Mitsubishi Electric Corp
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Filing: 1987-04-10
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Granted: 1989-09-05
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Expires: 2007-04-10
Abstract
Abstract An auto-tuning controller includes a fuzzy resonator for the adjustment of control parameters used in the development of a control variable for controlling the operation of a system to be controlled. A characteristic variable extractor is provided which is responsive to an error signal representative of a difference between a reference value and a controlled variable value output by the system to produce a characteristic variable indicative of the operational state of the system. Based upon this characteristic variable, a fuzzy resonator adjusts the control parameters in accordance with predetermined reasoning rules stored in a reasoning rule memory.
Inventors
- 👤 Kohei Nomoto
- 👤 Tetsuo Kirimoto
- 👤 Michimasa Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:04
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/0265; G05B13/0275; G05B13/0205; G05B13/024; Y; Y10; Y10S; Y10S706/00; Y10S706/90; Y10S706/902; Y10S706/903; Y10S706/906
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
123 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; and adjustment means for adjusting said at least one control parameter, including characteristic variable extractor means responsive to said error signal for developing a characteristic variable representing an operational state of said system, and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 2
Dependent Claim
123 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; and adjustment means for adjusting said at least one control parameter, including characteristic variable extractor means responsive to said error signal for developing a characteristic variable representing an operational state of said system, and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 3
Dependent Claim
42 words
The controller of claim 1, wherein said fuzzy reasoner means includes means for determining the degree to which said characteristic variable satisfies said reasoning rule and means for adjusting said at least one control parameter based upon said determined degree of satisfaction.
Claim 4
Dependent Claim
149 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; a test signal generator for generating a test signal; switch means for selecting one of said control signal and said test signal to be inputted to said system; characteristic variable generator means responsive to said test signal and said controlled variable for developing a characteristic variable representing an operational state of said system when provided with said test signal; and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 5
Dependent Claim
149 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; a test signal generator for generating a test signal; switch means for selecting one of said control signal and said test signal to be inputted to said system; characteristic variable generator means responsive to said test signal and said controlled variable for developing a characteristic variable representing an operational state of said system when provided with said test signal; and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 6
Dependent Claim
42 words
The controller of claim 3, wherein said fuzzy reasoner means includes means for determining the degree to which said characteristic variable satisfies said reasoning rule and means for adjusting said at least one control parameter based upon said determined degree of satisfaction.
Claim 7
Dependent Claim
16 words
An auto-tuning controller as defined in claim 3, wherein said test signal is a step signal.
Claim 8
Dependent Claim
163 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; test signal generator means for generating a test signal; switch means for selecting one of said reference signal and said test signal as an output; means for developing said error signal as a difference between either of said reference and test signals outputted by said switch means and a controlled variable outputted by said system which is indicative of its operating state; characteristic variable generator means responsive to said test signal, said controlled variable, and said error signal as a difference between said test signal and said controlled variable for developing a characteristic variable representing an operational stae of said system; and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 9
Dependent Claim
163 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; test signal generator means for generating a test signal; switch means for selecting one of said reference signal and said test signal as an output; means for developing said error signal as a difference between either of said reference and test signals outputted by said switch means and a controlled variable outputted by said system which is indicative of its operating state; characteristic variable generator means responsive to said test signal, said controlled variable, and said error signal as a difference between said test signal and said controlled variable for developing a characteristic variable representing an operational stae of said system; and fuzzy reasoner means responsive to said characteristic variable for adjusting said at least one control parameter in accordance with a predetermined reasoning rule.
Claim 10
Dependent Claim
42 words
The controller of claim 6, wherein said fuzzy reasoner means includes means for determining the degree to which said characteristic variable satisfies said reasoning rule and means for adjusting said at least one control parameter based upon said determined degree of satisfaction.
Claim 11
Dependent Claim
16 words
An auto-tuning controller as defined in claim 6, wherein said test signal is a pulse signal.
Claim 12
Dependent Claim
122 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; and adjustment means for adjusting said at least one control parameter, including characteristic variable extractor means responsive to said error signal for developing a characteristic variable representing an operational state of said system, velocity type fuzzy reasoner means responsive to said characteristic variable for calculating an adjustment variable in accordance with a predetermined reasoning rule, and
Claim 13
Dependent Claim
122 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; means for developing said error signal as a difference between said reference signal and a controlled variable outputted by said system which is indicative of its operating state; and adjustment means for adjusting said at least one control parameter, including characteristic variable extractor means responsive to said error signal for developing a characteristic variable representing an operational state of said system, velocity type fuzzy reasoner means responsive to said characteristic variable for calculating an adjustment variable in accordance with a predetermined reasoning rule, and
Claim 14
Dependent Claim
19 words
integrator means for integrating said adjustment variable to produce an optimum control parameter to be inputted to said controller.
Claim 15
Dependent Claim
19 words
integrator means for integrating said adjustment variable to produce an optimum control parameter to be inputted to said controller.
Claim 16
Dependent Claim
182 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; test signal generator means for generating a test signal; switch means for selecting one of said reference signal and said test signal as an output; means for developing said error signal as a difference between either of said reference and test signals outputted by said switch means and a controlled variable outputted by said system which is indicative of its operating state; characteristic variable generator means responsive to said test signal, said controlled variable, and said error signal as a difference between said test signal and said controlled variable for developing a characteristic variable representing an operational stae of said system; and velocity type fuzzy reasoner means responsive to said characteristic variable for calculating an adjustment variable in accordance with a predetermined reasoning rule; and integrator means for integrating said adjustment variable to produce an optimum control parameter to be inputted to said controller.
Claim 17
Dependent Claim
182 words
An auto-tuning controller, comprising: a controller for controlling a system by outputting a control signal in response to an error signal, based upon at least one control parameter; reference value signal generator means for generating a reference signal; test signal generator means for generating a test signal; switch means for selecting one of said reference signal and said test signal as an output; means for developing said error signal as a difference between either of said reference and test signals outputted by said switch means and a controlled variable outputted by said system which is indicative of its operating state; characteristic variable generator means responsive to said test signal, said controlled variable, and said error signal as a difference between said test signal and said controlled variable for developing a characteristic variable representing an operational stae of said system; and velocity type fuzzy reasoner means responsive to said characteristic variable for calculating an adjustment variable in accordance with a predetermined reasoning rule; and integrator means for integrating said adjustment variable to produce an optimum control parameter to be inputted to said controller.
Claim 18
Dependent Claim
42 words
The controller of claim 10, wherein said fuzzy reasoner means includes means for determining the degree to which said characteristic variable satisfies said reasoning rule and means for adjusting said at least one control parameter based upon said determined degree of satisfaction.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |