JPS5866107A - Process controller - Google Patents

Abstract

PURPOSE:To correct and set a control constant of a process, which is suitable to the operation condition of the process, automatically with a required minimum limit and a good timing, by incorporating an identification calculating function to a control loop. CONSTITUTION:If the change of a set value exceeds a prescribed extent when the change of a control constant is required, a new set value signal is compared with an initial set value in a set value variation calculating part 6, and a trigger signal is inputted to an OR circuit 8 when the variation exceeds a prescribed quantity. If the variation of a control deviation from a prescribed value exceeds a set circuit (n), a trigger signal is inputted from a comparing part 3 to the OR circuit 8. An external trigger signal is automatically inputted to the OR circuit 8. This trigger signal is inputted from the OR circuit 8 to an identification calculating part 11, and a new dynamic characteristic is calculated, and the identification value is calculated. A control constant calculating part 13 calculates a new control constant on a basis of this identification value. This control constant is inputted to a P.I.D controlling part 4 and is set newly, and a normal control loop is controlled with this new control constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical division of the invention The present invention provides a process [
This invention relates to an improvement in controlling/royal control*t.

(2) Conventional technique - When controlling a general process, a set value is set in advance, the control deviation between this set value and the measured process physical quantity (temperature, pressure, flow rate, etc.) is calculated, and this control deviation C 2, or an amount proportional to the integral value over time of control #111, or an amount proportional to a change in control deviation over time, etc. [Basic C: Controls the f process. These quantities are called control constants.

(hereinafter represented by P, I, D, respectively) These limiting constants (
P, I, D) are set to values C: which are the sum of the process dynamic characteristics (time constant, time, etc.) determined by the operating conditions of the process.

Therefore, the above control constant has conventionally been determined as follows. First, the external Lv is given to the FA Mrs. to be controlled, and the optimum noise signal for the FA Mrs. is selected from among them, and the noise signal is 162.
(Hereinafter, this identification value will be called "calculation 114.") This calculation is very complicated, so computers etc. The control constant of the error f process is determined, and this control constant Y f a process of the sea bream sC is set automatically. be.

However, in cases where the amount of change in process material flow is large, the operating conditions may change, so one control constant must be prepared in advance, and f of the operating conditions should be adjusted accordingly. l! A new control variable prepared for each time is reset to the main node of the wtf process.

Additionally, if new control constants are required,
New 12 operating conditions [Group 1: Identification calculations are being performed again. This work is performed by human judgment such as an operator.

(8) Problems with conventional technology - Conventional technology 62 has the following problems.

(2) Since several types of control constants V are prepared to correspond to the operating conditions of the fams, the correspondence to the operating conditions is naturally limited by the number of prepared control constants, resulting in poor versatility.

■ In addition, since the identification calculation work is outside the fams, considering the influence on other control systems, the minimum necessary
1 degree C nitai ty/J1 (must be done,
Therefore, artificially doing it twice would be extremely lacking.

■ Judgment by workers such as operators [This is a burden and is inefficient.

(4) Purpose of the Invention The present invention provides identification calculation 1aIIF! Control Lou! ≦Insertion of two wheelsC: From this, the purpose is to provide a vertically installed FA process control that automatically sets process control constants that match the operating conditions of the FO process and at the required minimum 1i1 timing.

(5) Configuration of the invention Detect the control amount, compare it with the process setting value to find the control deviation, and use this control deviation and the set control constant C.
Outputs a roaring adjustment signal [lI section [Motta fa Mrs.'s support];
A set value change amount calculation unit that calculates and outputs a toyf-signal of III if it is more than a predetermined change amount, and a control deviation value of the ll1lef process [compared with a predetermined deviation value, and when it is more than this predetermined deviation value, a predetermined - number When the above continues, a control deviation calculation section outputs the trigger signal of s2, and an identification calculation section that calculates the identification value of f process by either or both of the trigger signal of ill and the trigger signal of happiness 2. Na-eh,
Calculate the distribution control electric power from the identified value of the quantitative calculation section - II
The configuration is such that the settings and corrections of the control constants for I note *S are automatically performed at a predetermined time (62 lines) to perform fa Mrs control.

(6) Embodiment of the invention (FIG. 4 is a faq diagram of an embodiment of the present invention.
Mrs. 11 is the amount of control! A detection s2 is provided for converting a quantity C which can be detected and compared with the set value referenced in section 1.

Then, this detection unit 1 receives a set value inputted from the control section 1 (see II) and compares the signal from the detection unit 2 with the set value, and outputs a control deviation signal. The ratio *lIJ is connected. Furthermore, this ratio I2
Part 1 includes control deviation! No. Y base C: predetermined control constant (P,
1, D) C2 outputs a correction operation signal P-
ID adjustment II4 is connected, KonoP・■・DllI1
An operating section 1 is connected which performs 5lIIe control/operation based on the 1/8ll-Nikko correction operation signal-2.

Then, when the amount of change in the reduced setting value at the setting value input terminal 8 becomes equal to or greater than a predetermined amount of change, 1;)
! A set value change amount calculation unit C that outputs a − signal for j is connected. Also, Caoki comparison 1g x t: is tjI
Is the 4-device signal greater than a predetermined value? II4!
The first control deviation calculation Hs1, which outputs a trigger No. U V if it continues one or more times, is connected. And this II
I control deviation calculation unit r and I 11th set value change calculation unit -
Ward; 3 human power type OR [l@# is connected, and 0 foot circuit 1
The remaining input terminal 1 is connected to an external trigger input terminal 9 for inputting a desired timing signal from the outside via an interface circuit.

Furthermore, the OR circuit 1 has a constant value constant value change amount calculation ff1.
l, nil control deviation calculation unit r and external) 9f - any trigger signal 5 of the input terminal I: Therefore - foot calculation V
An identification calculation unit 11 is connected thereto. Also llIr
The 118 ratio IIR unit 1 has a control IJl! 4, when the number is more uniform than the predetermined value, the identification calculation V of the power calculation unit 11 is stopped, and the initial constant value -:R (
Or stop the control. ) A control deviation calculation unit 12 of 182 which outputs a stop command signal is connected to the control deviation calculation unit 11as. Then, from the identification value 1d-2 from the identification calculation unit 11, the identification calculation unit 11C generates a new control constant signal [ A control constant calculation unit 11 for output is connected.

Next, the operation of the control*1 configured as described above will be described.

First, in the normal control state 11 (in the second case, the initially set control constant ζ;・When the process is controlled in the control loop of I/D subclause 4 → operation is5 → control # process 1, 0th order ≦ 2, identification calculation is required, that is, control constant (P・■・D) change The time when I!v is required is as follows.

b) A state in which the change in set value exceeds the predetermined change range V.

口) The set number of times (i*
1gI) or more.

No. 9 A state in which a trigger signal is input from the external trigger input terminal.

That is, in the case of state (a), the new setting value No. 11 input from the setting value input terminal 8v is the setting value (punishment calculation unit 66
Second, the amount of change from the initial set value is determined, and it is determined that this amount of change is greater than the predetermined amount of change km,
From this time & electric value change amount calculation s6 OR@Route 11 Nido 9
One signal is human-powered.

1.5.g) In the case of 4I seagull, the control individual difference signal output from the comparator J [sequential control deviation calculation of Ill,
Compare with a predetermined value and calculate the control deviation (1
Number of times when the number is large! (For example, ΔRus threat device etc. within t*+, its ΔRus number [)#i, and when the number of times is 0- and the number of streaks is more than the number of kneeling times, control deviation calculation of jiil@1 I11
) Wogar (No. 8 is input to j11# at the 011th time mentioned above.

In the case of a divinity ■, intentional 1: the controlling constant V of the control system (for example, if the control system is combined with another control system -
ttjlJ, etc. C: A top signal is input to the previous eOR time ls# for artificial or automatic fishing.

History of above a) ff); Therefore, one or more of the output trigger signals 1d are manually inputted to the identification calculation sll via the previous OR circuit 1.

Then, in this identification calculation unit 11, new feeling = outside i to the process! Given iL, the dynamic characteristic is determined and its constant value is calculated. This calculation! ' The identified value is the control constant calculation section 7.
J, and new control constants are calculated. This calculated control constant is inputted to the P/D subsection 46 and a new 1 is set. In this way, with the newly set control constants, the control process I→testi□・I
IJ→Hijutei J→P・I・D gang section 4→1mm work section 5→
A control loop/consisting of control nodes 1 performs control.

In addition, the sensor of the vI period P・I・D subpath section 4 and the detection section 1 is also
(rjA not shown), etc. If the apparent trigger signal for identification calculation is generated due to a failure such as (rjA not shown), unnecessary identification calculation is performed, and the process and/or
In order to prevent the runt from becoming unstable, etc., the comparison s3 includes a second control deviation calculation unit 1J.
I! It is continued. This second control deviation calculation unit 121:
Then, the control deviation signal input from the comparator 1 is successively compared with a predetermined value. When the time is over, the abort command signal is output to the identification calculation @11. The identification calculation s11 that receives this stop finger 4r signal is performed by the 9f-signal-2 outputted by the above-mentioned a) g) No. 9.
Outputs the initial identification value V. (or outputs a signal to stop control i) That is, the control constant is set to an initial value <:14, and becomes an initial control layer in the fG7 process. (Or the control will be stopped.) The present invention is not limited to the above-mentioned embodiment 1, and can be deformed in a constant manner without deviating from the above-mentioned embodiment.

(7) Effects of the Invention Invention I: Therefore, in conjunction with the condition C of silane F, the t; In addition, the identification calculation is performed at the optimum timing for each period of identification calculation (determined according to predetermined conditions), and therefore the accuracy of the control constant correction is improved, and the tie L is kept to the minimum necessary level.
・Correction of control constants by identification calculation is possible J11
See two lines. In other words, it is possible to provide an extremely versatile growth control product 1 that can reduce the unstable factors given to the fams plant as much as possible, and easily reduce the burden on the production of oilers and the like.

[Brief explanation of the drawing]

Routing is according to the present invention≦;Block diagram Y of such a process control device
It shows. 4...P/■/D adjustment unit, -...Set value change amount calculation unit, 1...First control deviation calculation unit, II...Identification calculation unit -112...Control of s2 Deviation calculation unit, is...
Control constant calculation section.

Claims (1)

[Claims] Set control constant [Basic 1: Adjustment unit that adjusts the process and the amount of change in the set value of the process [Calculates the amount of change] If the amount of change is greater than the predetermined amount, outputs sl's t9f-belief. a control deviation value of the process [a control device that outputs a signal to 9f-4 when the control deviation value of the process is compared with a predetermined deviation value or more than a predetermined number of times; A difference calculation section,
Either or both of the -1 trigger signal and the s2 trigger signal C; an identification calculation section that calculates the identification value of the ftz process; and an identification value signal of this identification calculation section; * The control constant calculation unit is used to modify the control constant settings at a predetermined time, and the control constants are modified in two steps to control the process.
Featured in t' do! Process control device.