JPH03148703A - Sample value controller - Google Patents

Abstract

PURPOSE:To respectively suppress the amplitude of fluctuation, which is like vibration to be generated in a control system, and settling time with a small amplitude in a short time by updating an integration constant corresponding to the cumulative value of control deviation with the passage of time. CONSTITUTION:In an integration operation part 13, an integration constant generation part 14 is provided to output a signal 14a expressing an integration constant Kio with a value corresponding to a cumulative value SIGMAEi with the passage of time for deviation Ei expressed by an output signal 7a of a deviation cumulating part 7, and an integration constant multiplying part 15 is provided to update the already stored integration constant to the integration constant Kio expressed by the signal 14 when the signal 14a is inputted, and to output an integration operation signal 15a expressing a product between this updated integration constant and the deviation cumulative value. In such a case, when the control deviation is rapidly increased, the cumulative value of this control deviation with the passage of time is rapidly increased and accordingly, integrating time is rapidly updated in large order. Thus, the amplitude of the fluctuation, which is like vibration to be generated in a control amount, and the settling time can be respectively made small and short.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method of PI operation that is convenient for use when controlling an integrated amount over time, such as the integrated flow rate of an R body, to a predetermined value. Sample value control device, large fluctuation in VC constant value 01
Ic relates to a control device that can perform good control even when such occurrence occurs.

[Conventional technology]

FIG. 2 is a block diagram of a conventional sample value control device. In the figure, 1 is an input signal that samples the setting signal 8v as an analog signal at a predetermined period of 119 sig, and 2 is a T analog measurement signal Pv that measures the control amount 3a that outputs 36% of the process. Measuring section that outputs. 4 is periodic to the sampling operation of sampler l; 'Cli
A sampler that samples the signal Pv in the first period τ, 5
subtracts the sample value of the signal Sv sampled by the sampler I and the sample value of the signal Pv sampled by the sampler 4, and calculates the deviation B1 as a result of this subtraction.
This is a deviation calculation section that outputs a deviation signal 5m representing the difference. 6, a deviation signal of 5m is input.

and a proportional operation signal 6 representing the product Kp@Bi of the deviation Ei representing signal 586% and a built-in predetermined proportionality constant Kp-.
The proportional operation signal 7 that outputs 1 is inputted with the deviation signal 5a, and the signal 7a representing the cumulative value ΣBM over time is obtained by sequentially adding the deviations El represented by the signals 5a inputted every period τ. A deviation accumulator 8 outputs an integral constant KM which is stored in advance so that the signal 7a is inputted, and the deviation cumulative value ΣE! represented by the signal 7a. The product Kl・Σ
An integral constant multiplication section outputs an integral operation signal ga representing El, and 9 is an integral operation section consisting of a deviation accumulation section 7 and a multiplication section 8. Reference numeral 10 denotes a signal adder which outputs the sum of the proportional operation signal 6a and the integral operation signal 8a as the operation signal 10a. In FIG. 103 to output the aforementioned control 111 quantity 3a. Reference numeral 11 denotes a sample value control device consisting of the various parts shown in the figure except for process 3.

In FIG. 2, the signal 10a is input to the process 3 by inputting the operation signal 10a6'' to the process 3.
．． Measuring part 2. Since the control device 1101 is configured to make the deviation Ei zero through the sampler 4 and the deviation calculating section 5 sequentially, it is clear that the control device 11 controls the control amount 3a6% to a value according to the setting signal svvc. And also. in this case.

As long as the deviation cumulative value Σ13i does not become zero, a non-zero operation signal 101 is given to the process 3 to control the control amount 3aK. This control 111 device I! is used when you want to control the flow rate to a predetermined value.
It is clear that it is convenient to use

[Problem to be solved by invention 01] In Fig. 2, the control device 116% is configured as described above, and furthermore, in this case, the maximum deviation Ei that is considered to be caused by the disturbance 12 etc. applied to the process 3 is Assuming the value Effl in advance, even if such a large deviation Em occurs, the amplitude arrangement of the oscillatory fluctuations caused in the controlled variable 311 by the operation of the control device 11 [Settling time 6
”-The above-mentioned proportional constant Kp and integral constant are set to 16; in order to make each of them as small and short as possible.
If a change 01 occurs that makes the deviation Bi more than Hm,
The leg restraint device! The amplitude and settling time 0'' of photographic fluctuations caused by the control amount 3aK become larger and longer due to the operation of the control amount 3aK, and there is a point 01 at which the control amount 31 cannot be effectively controlled.

The object of the present invention is to control the amplitude and settling time of the oscillatory fluctuations generated in order to suppress the fluctuations of the +sipple value suppressing device, even if large fluctuations that are not predicted occur. The object is to be able to suppress the noise with a small amplitude and in a short period of time.

(Means for Solving the Problem) In order to achieve the above object, according to the present invention, a deviation signal representing a control deviation as a multiple value taken at a predetermined sampling period is input, and a proportional operation section that outputs a proportional operation signal representing the product of the deviation and a built-in proportional constant; an integral operation section that outputs an integral operation signal representing a product with a built-in integral constant, and a sample value control device configured to output a signal of the sum of the proportional operation signal and the integral operation signal as an operation signal. Configure.

[Effect]

With the above configuration, when the control deviation increases rapidly, the cumulative value of the deviation over time increases rapidly, and the integration time is suddenly updated to a large value.

As a result, it is possible to form the flJ operation section so that a strong pullback operation is performed in response to an increase in control deviation according to the operation signal. It is possible to obtain the ν pull value control device 01 which can reduce and shorten the amplitude and settling time of photographic fluctuations caused by the braking operation of the value control device.

[Eleventh Example] FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, the difference from FIG. 2 is that the output signal 7a of the deviation accumulation section 7 is input to the integral operation section 13 corresponding to the integration operation section 9 mentioned above, and the deviation Ei represented by the signal 7m is accumulated over time. When the integral constant generator 14 outputs the signal 14a representing the integral constant Kio having a value corresponding to the value ΣELK, and when the signals 7a and 148 are input and the signal 1411 is input, the signal 14m generates the already stored integral constant. An integral constant multiplier 15 and 01 are provided for updating the integral constant KiOK and outputting an integral operation signal 15a representing 10·ΣBi as the product of the updated integral constant and the cumulative deviation value represented by the input signal 7m.

Deviation accumulator 7, integral constant generator 14, and integral constant multiplier 1
5 constitutes the above-mentioned integral operation section 1-fF, and the operation signal 16 is the sum of the signals 6@ and 15a.
Outputs 1I. Signal adders 16 and 61 corresponding to the signal adder 10 described in #1 are provided. Reference numeral 17 in the wL1 diagram indicates a sump and I value control device comprising each of the illustrated parts except for process 3.

In the sample value control device 17C, each part is configured as described above, and furthermore, when the cumulative deviation value ΣEi increases, the integral constant multiplier 17C generates a large integral constant Kio corresponding to 146% Σ. As a result, the operation signal 16m
l is the process 3. a fixed part 2. The integral constant Ki is calculated for the control deviation Bi through the input circuit 1 to 4 and the deviation calculation section 5 in sequence.
Each part b is configured so that when a strong pull-return operation corresponding to o is performed, the parts b=. 01, according to this control device 17.

Even if a change 01 occurs in the control amount 3a that makes the deviation Ei greater than the Ern described above, in that case, the amplitude of the oscillatory fluctuation caused in the control 11@311 due to the operation of the control device 1F and the settling time are both small amplitudes. This means that it can be suppressed in a large amount of time and in a short period of time.

In addition, in the above-mentioned actual example, sampler 1 and sampler 4
In the present invention, these samplers 1.4 are omitted, and the deviation calculating section 5 calculates the difference between the setting signal Sv and the measurement signal PV to obtain an analog deviation signal as the testis. A sampler configured to output the analog deviation signal and sampling the analog deviation signal at a period τ is provided.
The output signal of this sampler is transferred to the proportional operation section 6 and the integral operation section 1.
You can enter 3 and 5.

[Effects of the Invention] As described above, in the present invention, a deviation signal representing a restriction deviation as a sample value taken during a predetermined sampling dark period is input, and a control deviation and a built-in proportionality constant are input. A proportional operation section that outputs a proportional operation signal representing the product of The sample value control device 5 is provided with an integral operation section that outputs an operation signal, and outputs a signal that is the sum of the proportional operation signal and the integral operation signal as an operation signal.

Therefore, when configured as above, the control deviation is 6"-f
When i increases, the cumulative value of the control deviation over time rapidly increases, and the integration time is rapidly updated to a larger value.As a result, the operation signal causes the integration operation to be performed so that a strong pullback operation 01 is performed in response to the increase in the control deviation. Therefore, even if an unexpectedly large fluctuation occurs in the control deviation, the present invention eliminates the possibility of an oscillatory fluctuation occurring in the controlled variable due to the control operation of the sample value control device. Make the width and settling time smaller and shorter 6”-
This has the effect of providing a sample value control device that can be used.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention. Figure 2 is a block diagram of a conventional sample value control device. 5a...-deviation signal, 6...proportional action section,
6a...Proportional operation signal, 811, 151--
----- Integral operation signal, 9.13... Integral operation signal 10al 16a------ Operation signal, 11°1
Hu... Sample value control device, Ei...
Control deviation.

Claims (1)

[Claims] 1) A proportional operation section that receives a deviation signal representing a control deviation as a sample value taken at a predetermined sampling period and outputs a proportional operation signal representing the product of the control deviation and a built-in proportionality constant; an integral operation section to which a signal is input and outputs an integral operation signal representing the product of the cumulative value of the control deviation over time and a built-in integral constant updated according to the cumulative value over time; A sample value control device characterized in that a signal that is the sum of the signal and the integral operation signal is output as an operation signal.