JPH04114601U - process control equipment - Google Patents

Abstract

(57) [Summary] [Purpose] By converting operator experience into a function, disturbances are corrected and good control is achieved without operator intervention. [Structure] A first broken line function means that creates an antecedent part of a conditional expression based on operational knowledge of the process, and sets the degree of an input value state corresponding to a control factor based on the conditional expression as a broken line function;
Compare the output of the first broken line function means with the output of the second broken line function means, in which the degree of output corresponding to the antecedent part of the conditional expression is set by a broken line function, and select the smaller one. a first arithmetic means for extracting the output of the first arithmetic means; a correction circuit for correcting this output with a disturbance factor signal; A third broken line function means outputs a conditional expression result, and synthesizes broken lines of a plurality of conditional expressions corresponding to control factors output from the third broken line function means, and controls a signal corresponding to the area of the broken line. It is composed of a second arithmetic means for output.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention calculates the optimal control output for a process with multiple control factors. For more information on process control equipment, see Process Operation Knowledge for Operators and Technicians. Knowledge is accumulated in advance, and process operation can be performed without operator intervention. The present invention relates to a process control device that enables efficient control.

0002

[Conventional technology]

Conventional process control equipment that controls processes with multiple control factors and disturbances Generally, only one input value out of multiple control factors is controlled, and the remaining control factors are used to control the input value. When the amount of process changes rapidly or when measures need to be taken in advance due to disturbances, etc., use the The operator judges the situation and changes the control gain, calculation function, etc. to achieve the optimal response. It was intended to be dealt with as indicated.

0003

[Problem that the idea aims to solve]

However, such conventional equipment relies on the operator's experience and intuition, and If the situation is not accurately judged, there is a problem that optimal control results cannot be obtained. Ru.

0004 The present invention was developed in consideration of these points, and is based on prior process operational knowledge and experience. Controllability can be improved by sending control outputs according to conditional expressions created based on experiments. The purpose is to provide a good process control device.

[0005]

[Means to solve the problem]

Process control equipment is used to control processes with multiple control factors and disturbances. hand, Create the antecedent part of the conditional expression based on the operational knowledge of the above process, and A first broken line function in which the degree of the input value state corresponding to the control factor is set as a broken line function. means and A second broken line in which the degree of output corresponding to the antecedent part of the conditional expression is set using a broken line function. function means; The output of the first broken line function means and the output of the second broken line function means are compared, and a first calculation means for extracting the output of the other side; a correction circuit that corrects the output from the first calculation means using a disturbance factor signal; The output from the first calculation means corrected by this correction circuit is given, and the output is third broken line function means for outputting a signal corresponding to the input value as a result of a conditional expression for the input value; and, of a plurality of conditional expressions corresponding to the control factors output from the third broken line function means. A second operation that combines the broken lines and outputs a signal corresponding to the area of the broken lines. calculation means and It is composed of:

[0006]

[Effect]

Each of the first to third broken line function means uses process operational knowledge, experience, etc. as an input value in advance. The combination of outputs for these is realized using conditional expressions.

[0007] The correction means corrects the output from the first calculation means based on factors such as disturbance.

[0008] The second calculation means synthesizes the results of each conditional expression corrected by disturbance etc. and sends it to the process. The control output is determined.

[0009] This enables control that withstands sudden fluctuations in process disturbances.

0010

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings.

[0011] FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is It is a process with multiple control factors, and 2 is the process control device related to the present invention. , signals PV1 to PVn relating to a plurality of control factors are input from process 1.

0012 In process control device 2, 3 is the antecedent of the conditional expression based on the operational knowledge of process 1. The degree of the input value state corresponding to the control factor is folded based on the conditional expression. With the first broken line function set as a linear function, each of the multiple control factors is set. It is being

[0013] 4 is the second broken line that sets the degree of output corresponding to the antecedent part of the conditional expression using a broken line function. Function means 5 indicates the output of the first broken line function means 3 and the output of the second broken line function means 4. A first calculation means for comparing and extracting the smaller output; 6 is the first calculation means 5; This is a correction circuit that corrects the output from the external signal using the disturbance factor signal. For example, the parameter α corresponding to the disturbance is added to the output of the first calculation means 5. The structure is such that it adds up. 7 is the first calculation method corrected by the correction circuit 6 The output from the stage is given, and the signal for that output is the result of the conditional expression for the input value. This is the third polygonal line function means for outputting.

[0014] 8 is a plurality of conditional expressions corresponding to the control factors output from the third broken line function means 7; A second device which synthesizes the broken lines of and outputs a signal corresponding to the area of the broken lines as a control output. A calculation means provides the output of the calculation means to process 1 as a control output value MV. ing.

[0015] Here, the conditional expressions set in the first and second broken line function means have a relationship such that if the antecedent part is XX, then the consequent part is .

[0016] Figure 2 shows one of the broken line functions set in the first, second and third broken line function means. FIG. 3 is a diagram illustrating an example.

[0017] As shown in the diagram, the input or output is on the X axis, and the input or output is on the Y axis. The corresponding grade is set in advance based on operational knowledge of the process, etc. Here, in the third broken line function, the calculation result x of the first calculation means 5 is corrected to x1. By doing this, we can modify the entire broken line function as shown by the dashed line. It has been done.

[0018] The operation of the device configured as described above will be explained as follows.

[0019] FIG. 3 is a flowchart showing an example of the operation.

[0020] The antecedent part of the conditional expression for each control factor from process 1 is The second broken line function means 3 is set based on the process operation knowledge, and the conditional expression is set in stage 3. The consequent part is set.

[0021] When each control factor is input to the first broken line function means 3 in charge of the antecedent part, An input grade G1 corresponding to that input is calculated. The first calculation means 5 inputs Grade G1 and grade G2 from the second broken line function means 3 in charge of the consequent part. Compare, extract the smaller grade and set it to the third broken line function means 7, where the previous If the subject part is XX, determine the conditional expression result that is the consequent part. Once the conditional expression result is determined, the following If there is a disturbance, the result of calculation by the first calculation means is supplemented. Correction calculations can be performed in the positive circuit 6.

[0022] This operation is performed for each conditional expression, and when all conditional expressions are completed, the second operation is performed. The calculation means 8 performs line composition of each conditional expression. Next, calculate the area of the broken line and Calculate the X coordinate of 1/2 of the product and output it to process 1 as a control output value.

[0023] The above operation is based on multiple controls whose setting values and gains are determined based on process operation knowledge. In a process with a control factor, the knowledge can be expressed as a conditional expression using a broken line function. This makes it possible to realize simple fuzzy control and improve operational efficiency. Any case can be handled without the intervention of a controller.

[0024]

[Effect of the idea]

As explained in detail above, according to the present invention, it is possible to In conventional control, operations that previously relied on the operator's experience and intuition can now be performed by the operator. By converting the experience of Good control can be achieved without operator intervention.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a line diagram showing an example of a broken line function set in each of first, second, and third broken line function means.

FIG. 3 is a flowchart showing an example of operation.

[Explanation of symbols]

1 process 2 Process control device 3, 4, 7 Linear function means 6 Correction circuit 5,8 Calculation means

Claims (1)

[Scope of utility model registration request] 1. A process control device for controlling a process with multiple control factors and disturbances, which creates an antecedent part of a conditional expression based on operational knowledge of the process and controls the process based on the conditional expression. a first broken line function means that sets the degree of the input value state corresponding to the factor using a broken line function; a second broken line function means that sets the degree of the output corresponding to the antecedent part of the conditional expression using a broken line function; a first calculating means for comparing the output of the first broken line function means and the output of the second broken line function means and extracting the smaller output; and a first calculating means for extracting the smaller output; a third linear function means which is given the output from the first calculation means corrected by the correction circuit and which outputs a signal for the output as a result of the conditional expression for the input value; and a second calculation means for synthesizing the polygonal lines of a plurality of conditional expressions corresponding to the control factors output from the third polygonal line function means and for outputting a signal corresponding to the area of the polygonal line as a control output. Characteristic process control equipment.