Controller for realizing multi-variable control through single-variable control unit
A technology of multi-variable control and control unit, which is applied in the direction of program control and electrical program control in sequence/logic controllers, and can solve the problems of single control function and inability to use program variables.
Inactive Publication Date: 2016-01-27
苏鸿德
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Problems solved by technology
The control strategy in the prior art usually needs to use multiple univariate controllers, each univariate controller corresponds to a controlled variable (that is, the MV and CV of each univariate controller form a loop by itself), thus , can only provide a single control function, and cannot use the rest of the program variables to assist in the control
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[0053] image 3 , Figure 4 A controller 2 according to an embodiment of the present invention is shown. The controller 2 is used to control a program and includes a control unit 201 , at least one variable 202 , at least one dynamic deviation factor unit 203 and a compensation unit 204 .
[0054] The control unit 201 of this embodiment takes a single variable controller as an example, wherein the control unit 201 does not directly compare the original measurement signal 205 and the reference signal 206 to obtain the output signal 207 (the output signal 207 is sent to the program to change the measurement signal 205 approaching the reference signal 206 ), because the measurement signal 205 will be replaced by the compensated compensation signal 212 (detailed below). In other embodiments, the control unit may be a multivariable controller.
[0055]The variable 202 is one of the signals in the program that can affect the measurement signal 205 or be affected by the control uni...
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A controller for realizing multi-variable control through a single-variable control unit comprises a control unit, at least one variable, a dynamic offshoot factor unit and a compensation unit. The control unit obtains an output signal according to a measurement signal and a reference signal, and then, the output signal is sent to a program to enable the measurement signal to approach to the reference signal. The variable is a signal capable of influencing the measurement signal or being influenced by the control unit. The dynamic offshoot factor unit obtains a dynamic offshoot factor of the variable according to a short time average value and a long time average value of the variable. The compensation unit enables the dynamic offshoot factor to compensate the measurement signal, the reference signal or the output signal to obtain the corresponding compensation signals. The compensation signals replace the measurement signal, the reference signal or the output signal correspondingly so as to control the program.
Description
technical field [0001] The present invention relates to a controller, in particular to a controller that achieves multivariable control through a single variable control unit. Background technique [0002] figure 1 It is a schematic diagram of a dynamic program (DynamicProcess, or process). exist figure 1 There are three or more simulated program variables (ProcessVariable, PV) in the shown dynamic program, and each program variable will change with time, and the variables will have different mutual influence relationships. At least one of them is an independent variable (IndependentVariable) and a dependent variable (DependentVariable). [0003] Such as figure 2 As shown, in order to control one of the dependent variables and define it as a controlled variable (ControlledVariable, CV) and add a control unit 101 such as a single variable controller (Single-InputSingle-Output, SISO), a control loop is formed ( ControlLoop), so the dynamic program also contains the contr...
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IPC IPC(8): G05B19/04
Inventor 苏鸿德
Owner 苏鸿德