EP0128491A2
Expired / Lapsed
EP
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Time-discrete adaptive switching on-off-controller
Assignee: Omron Corp
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Filing: 1984-06-01
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Granted: —
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Expires: 2004-06-01
Abstract
Abstract The present invention relates to an arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as reaction to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of a parameter estimation device in order to adapt them to the process to be controlled, even when the process behaviour changes, and which has a device for the input and change of the setpoint, the limits of the process output and the sampling time as well as a measuring device for the periodical measurement of the process input. The arrangement further comprises two alternatively working control devices one of which is active in the stationary phase and the other of which is active in the start-up phase of the process or after setpoint changes, and a switching device which activates one or the other said control device in dependence of the result of the measurement of the process output and of input current setpoint, wherein the actuator is served by the active control device.
Inventors
- 👤 Heinrich Prof. Dr.-Ing. Rake
- 👤 Ulrich Dr.-Ing. Hoffmann
- 👤 Ulrich Dipl.-Ing. Müller
- 👤 Rudolf Dr.-Ing. Breddermann
- 👤 Rainer Dr.-Ing. Blumbach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/04; G05B13/048
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
217 words
An arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as responce to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of parameter estimation means in order to adapt them to the process to be controlled, even when the process behaviour changes and which has a device for the input and change of the setpoint and sampling internal as well as a measuring device for the periodical measurement of the process output, characterized in that it comprises two alternatively working first and second control means one of which is active in the stationary phase and the other of which is active in the start-up phase of the process or after setpoint chages, and switching means which activates one or the other said control means in dependence of the result of the measurement of the process output and the input current setpoint, wherein the said actuator with two switchirg levels for giving the process input to the process is served by the active control means.
Claim 2
Dependent Claim
217 words
An arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as responce to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of parameter estimation means in order to adapt them to the process to be controlled, even when the process behaviour changes and which has a device for the input and change of the setpoint and sampling internal as well as a measuring device for the periodical measurement of the process output, characterized in that it comprises two alternatively working first and second control means one of which is active in the stationary phase and the other of which is active in the start-up phase of the process or after setpoint chages, and switching means which activates one or the other said control means in dependence of the result of the measurement of the process output and the input current setpoint, wherein the said actuator with two switchirg levels for giving the process input to the process is served by the active control means.
Claim 3
Dependent Claim
47 words
An arrangement as claimed in claim 1, characterized in that the switching means activates the second control means if the process has to be started or has to follow a setpoint change or activates the first control means if the proces is run in the stationary phase.
Claim 4
Dependent Claim
28 words
An arrangement as claimed in claim 1, characterized in that the two control means are provided with information about the process by means of a common parameterestimation means.
Claim 5
Dependent Claim
72 words
An arrangement as claimed in claim 1, characterized in that the first control means which is active in the stationary phase of the process predicts all possible 2r future process output sequences, wherein the prediction of the process output sequence on the basis of a certain process input sequence is made by reusing the prediction of a portion of the process output sequence made on the basis of other process input sequence.
Claim 6
Dependent Claim
51 words
An arrangement as claimed in claim 1, characterized in that in the first control means which is active in the stationay phase of the process the prediction time can be decoupled from the choice of the sampling time by dividing each discrete-time prediction step into a prefixed number of sampling intervals.
Claim 7
Dependent Claim
41 words
An arrangement as claimed in claim 1, characterized in that the determination of the evaluation parameter for each predicted process output and the resulting selection of the actuating signal for the next sampling interval is carried out together with the prediction.
Claim 8
Dependent Claim
69 words
An arrangement as claimed in claim 1, characterized in that the second control means which is active in the start-up phase of the process or after a setpoint change predicts the extremal point of the future process output sequence which is caused by the process input sequence within which only one switching of actuating signal occurs, the switching occurring after the first sampling interval of this process input sequence.
Claim 9
Dependent Claim
53 words
An arrangement as claimed in claim 7, characterized in that the actuating signal for the next sampling interval is taken from the said process input sequence, if the system deviation in the extremal point of the future process output sequence is of such a nature that no overshooting of the process output occurs.
Claim 10
Dependent Claim
50 words
An arrangement as claimed in claim 7, characterized in that in all other cases, such actuating signal is taken for the next sampling interval that results from a switching of such actuating signal to its counteracting level that is for the first sampling interval of the said process input sequence.
Claim 11
Dependent Claim
48 words
An arrangement as claimed in claim 7, characterized in that the prediction time is determined in such a manner that the time available within one sampling interval for the determination of the actuating signal to be applied in the next sampling interval is exploited as completely as possible.
Claim 12
Dependent Claim
52 words
An arrangement as claimed in claim 1, characterized in that by means of limit supervisory control means the active control means is turned off and the actuating signal of the process is switched off or on if the process output exceeds the preselected upper or lower limit of the process output, respectively.
Claim 13
Dependent Claim
58 words
An arrangement as claimed in claim 1, characterized in that limit supervisory control means being activated manually is applied for the control of the process with the aim to control the process by means of the actuator in such a way that the parameter estimation means yields a process model which can by used for later adaptive control.
Claim 14
Dependent Claim
19 words
An arrangement as claimed in claim 1, characterized in that the actuator is used synchronously with the measuring device.
Claim 15
Dependent Claim
171 words
An arrangement used in the transient phase of the process to be controlled comprising: means for generating a process input sequence within which only one switching of actuating signal occurs, the switching occurring after the first sampling interval of this process input sequence, means for predicting a process output sequence over a number of future sampling intervals as responce to the process input sequence generated that is applied to a discrete-time linear process model, and further predicting the extremal point of the process output sequence, and means for selecting the actuating signal for the next sampling interval from the process input sequence generated, if the system deviation in the extremal point of the future process output sequence is of such a nature that no overshooting of the process output occurs, and for selecting, in all other cases, such actuating signal for the next sampling interval that results from a switching of such actuating signal to its counteracting level that is for the first sampling interval of the process input sequence generated.
Claim 16
Dependent Claim
171 words
An arrangement used in the transient phase of the process to be controlled comprising: means for generating a process input sequence within which only one switching of actuating signal occurs, the switching occurring after the first sampling interval of this process input sequence, means for predicting a process output sequence over a number of future sampling intervals as responce to the process input sequence generated that is applied to a discrete-time linear process model, and further predicting the extremal point of the process output sequence, and means for selecting the actuating signal for the next sampling interval from the process input sequence generated, if the system deviation in the extremal point of the future process output sequence is of such a nature that no overshooting of the process output occurs, and for selecting, in all other cases, such actuating signal for the next sampling interval that results from a switching of such actuating signal to its counteracting level that is for the first sampling interval of the process input sequence generated.
Claim 17
Dependent Claim
235 words
15 . In an arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as responce to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of parameter estimation means, in order to adapt them to the process to be controlled, even when the process behaviour changes and which has a device for the input and change of the setpoint and the sampling interval as well as a measuring device for the periodical measurement of the process output, the method comprising; predicting in a stationary phase all possible 2 r future process output sequences and in a transient phase an extremal point of one future process output sequence which is caused by process input sequence within which only one switching of actuating signal occurs, the switching occurring after the first sampling interval of this process input sequence, respectively, selecting one or the other prediction in dependence of the result of the measurement of the process output and the input current setpoint, and actuating the said actuator in the next sampling interval based on the switching level resulting from said one or the other prediction.
Claim 18
Dependent Claim
235 words
15 . In an arrangement for the discrete-time adaptive on-off switching control of a continuous-time process with a binary switching actuator, which uses for the determination of the on-off actuating signal a prediction of a process output sequence over several future sampling intervals as responce to a possible process input sequence that is applied to a discrete-time linear process model and which estimates and updates in every sampling interval the parameters of the process model by means of parameter estimation means, in order to adapt them to the process to be controlled, even when the process behaviour changes and which has a device for the input and change of the setpoint and the sampling interval as well as a measuring device for the periodical measurement of the process output, the method comprising; predicting in a stationary phase all possible 2 r future process output sequences and in a transient phase an extremal point of one future process output sequence which is caused by process input sequence within which only one switching of actuating signal occurs, the switching occurring after the first sampling interval of this process input sequence, respectively, selecting one or the other prediction in dependence of the result of the measurement of the process output and the input current setpoint, and actuating the said actuator in the next sampling interval based on the switching level resulting from said one or the other prediction.
References Cited (Backward Citations)
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