KR20160036144A - Program and device for test a proportional integral differential control system - Google Patents

Abstract

The present invention relates to a program and device for testing a proportional-integral-differential (PID) controller. A program for testing a PID controller comprises the steps of: (a) receiving information of a PID controller; (b) setting a control variable for a proportional gain, differential gain or integral gain of a signal input to the PID controller; (c) setting an input indication value corresponding to the signal input to the PID controller; and (d) determining whether the PID controller is satisfactory by checking PID control for the input indication value of the control variable. According to the present invention, there arises an advantage of checking the control characteristics of a PID controller without connection to a plurality of measuring devices.

Description

[0001] PROGRAM AND DEVICE FOR TEST [0002] PROPORTIONAL INTEGRAL DIFFERENTIAL CONTROL SYSTEM [0003]

The present invention relates to a program and an apparatus for checking the function of a PID controller, and more particularly, to a program and apparatus capable of checking and checking PID control operation characteristics of an input signal applied to a PID controller.

PID control is a kind of feedback control that allows the output of the system to maintain the reference voltage based on the error between the control variable and the reference input. It includes proportional control, proportional-integral control, proportional- Derivative control means control method.

Proportional control refers to a control procedure that produces a control signal by multiplying the error signal between the reference signal and the current signal by an appropriate proportional constant gain. Proportional-integral control is used by connecting the integral control to the proportional control in parallel by integrating the error signal and generating the control signal.

PID control is a control method used to measure the reaction of an automation system or to control the reaction, and it is possible to control temperature, pressure, flow rate, rotation speed, and the like. For example, PID controllers are used for on-site control of reactor safety systems and turbine process systems in nuclear power plants. Therefore, maintaining the proper function and precision of the PID controller directly affects the safety operation and efficiency of the power plant. Korean Patent Laid-Open No. 10-2008-0074635 discloses such a conventional PID control device.

Conventionally, there is a problem that a plurality of measurement test equipment must be connected for calibration and function check of the PID controller. More specifically, in order to calibrate and check the function of the PID controller, a recorder, a signal generator, a signal converter, and a voltage / current meter must be connected at every inspection.

In this case, since the electrical check circuit is manually configured, the calibration and function check process of the PID controller is inconvenient and takes a lot of time. Moreover, there is a problem that the connection of the check circuit is complicated, resulting in measurement error, connection failure, and human error.

In addition, the conventional PID controller inspection has a problem that it is difficult to systematically analyze and manage the maintenance history since the maintenance history is managed by preparing the maintenance check sheet manually after calibration of 5 points.

Accordingly, the present invention provides a program for modularizing the measuring instrument for checking the function of the PID controller and an apparatus for checking the function of the PID controller provided with the program. In particular, the present invention intends to provide a program and an apparatus for checking the operation mode of the PID control and checking the function of the PID controller which is easy to check.

According to an aspect of the present invention, there is provided a program for a function check of a PID controller, the program comprising the steps of: (a) receiving information of a PID controller; (b) setting a control variable for a proportional gain, a differential gain, or an integral gain of a signal input to the PID controller; (c) setting an input indication value corresponding to a signal input to the PID controller; And (d) determining whether the PID controller is good by confirming the PID control for the input indication value of the control variable.

Preferably, step (b) includes: a pre-check reading step of checking a control variable initially set in the PID controller; A setting value changing step of changing a value of the control variable; And a post-check reading step of checking the changed control variables in the changing step.

Preferably, the step (d) includes: a decision selection step of selecting a PID control mode for the input indication value; And a waveform output step of generating an output waveform corresponding to the PID control mode.

Further, the present invention provides an apparatus for checking the function of a PID controller, comprising: a slot in which a PID controller is mounted; And a processor for checking the function of the PID controller, the processor comprising: (a) receiving information of the PID controller; (b) controlling the proportional gain, differential gain, or integral gain of the signal input to the PID controller; Setting a variable; (c) setting an input indication value corresponding to a signal input to the PID controller; And (d) determining whether the PID controller is good or not by confirming the PID control of the input indication value of the control variable.

According to the present invention, there is an advantage that the control characteristics of the PID controller can be confirmed without connecting a plurality of measurement devices.

Further, the present invention has an advantage that simple and quick functional inspection can be performed without mechanical or electrical damage to the PID controller.

Further, the present invention has an advantage in that the error caused by the connection failure, the recognition error, and the like is reduced in the function check of the PID controller, thereby improving the reliability of the PID controller function check.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart for a functional check of a PID controller according to an embodiment of the present invention. FIG.
FIG. 2 illustrates a process of performing a function check program of the PID controller according to the embodiment of the present invention.
3 shows an apparatus for checking the function of a PID controller according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the exemplary embodiments. Like reference numerals in the drawings denote members performing substantially the same function.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart for a functional check of a PID controller according to an embodiment of the present invention. FIG. Referring to FIG. 1, a program for checking the function of the PID controller includes: (a) receiving information of a PID controller; (b) setting (S20) a control variable for a proportional gain, a differential gain, or an integral gain of a signal input to the PID controller; (c) setting an input instruction value corresponding to a signal input to the PID controller (S30); (d) checking (S40) whether the PID controller is good or not by confirming the PID control with respect to the input indication value of the control variable; And (e) a reporting step.

(a) The information of the PID controller received in step S10 may be a device name, a serial number, a model name, an inspection date and time, a control variable, and the like.

(b) step S20 is a pre-check reading step S201 for checking a control variable initially set in the PID controller; A setting value changing step (S203) of changing the value of the control variable; And a post-check reading step (S205) of confirming the changed control variables in the changing step.

(c) Step (S30) sets an input instruction value corresponding to a signal input to the PID controller. The PID controller measures the output value of the object to be controlled and compares it with a target set value to calculate an error, and calculates a control value necessary for the control using the error value. Considering this, the output value of the object to be controlled by the PID controller corresponds to the signal input to the PID controller.

In the embodiment of the present invention, since a separate signal generator is not connected to the PID controller, an input value corresponding to a signal input to the PID controller must be set. In this case, in step (c) (step S30), a plurality of input instruction values may be set.

More specifically, the range of the signal input to a general PID controller is 4 to 20 mA. When performing the 5-point calibration of the PID controller, input indication values can be set to 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA, which are obtained by dividing the 4 to 20 mA sections into five sections. It is possible to check the function of PID controller by checking PID control characteristics of 0%, 25%, 50%, 75%, and 100% of output indicator by 5 point calibration.

(d) step S40 is a decision selection step (S401) of selecting a PID control mode for the input indication value; And a waveform output step (S403) for generating an output waveform corresponding to the PID control mode.

PID control mode means a control mode according to the above-described proportional control (P control), proportional-integral control (PI control), proportional-differential control (PD control), and combinations thereof. P control refers to a control technique that allows fine control of the target value by adjusting the control variable in proportion to the error between the present value and the target value.

PI control means a control technique used to eliminate residual error that causes a slight error in the present value and the target value when the decreasing error value falls below the resolution. PD control refers to a control technique for controlling the degree of control by measuring the difference between the immediately preceding error and the current error. The user can select a control technique for checking the function of the PID controller in the decision selection step S401.

 The waveform output step S403 can output the waveform corresponding to the input indication value and the control variable corresponding to the PID control mode selected in the decision selection step S401. Since the waveform output step S403 outputs the output waveform by the control variable together with the input instruction value, the user can visually judge whether there is any abnormality in each PID control mode of the PID controller.

(e) The report generation step (S50) records the measurement result data and the characteristic waveform graph by the function check program of the PID controller in a report form created in an Excel file.

FIG. 2 illustrates a process of performing a function check program of the PID controller according to the embodiment of the present invention. 2 (a) shows a main screen (SL mode screen) 20 of the PID controller function check program.

In the SL mode (20) screen, the user inputs the device name, model name, and serial number. Then, if you click the Read before check button (23), you can check the control variable (22) which is the default value of the PID controller. The control variable 22 may be a parameter related to a proportional operation, an integral operation, a propotional band performing a differential operation, a reset time, and a rate time.

Each control variable 22 is assigned an address in the database as a specific DATA POINT (21). When the user desires to change the control value 22, which is the default value of the PID controller, the user can change the value by inputting the DATA POINT 21 and the setting value 25 to which the control variable to be changed is assigned.

The user can confirm the changed control variable 22 by clicking on the Read and Read (27) button. After finishing the setting of the control variable 22, the user clicks the PID characteristic determination button 29 to confirm the PID control characteristic.

2 (b) shows an input instruction status check window 30 for setting an input instruction value. Referring to FIG. 2B, when the user performs the five-point calibration of the PID controller, the user can input an input indication value obtained by dividing the input range of 4 to 20 mA into five sections in the input value 301 . Thereafter, the user can confirm the characteristic waveform of the PID control by clicking the execute button (303).

2 (c) shows a display window 40 for judging whether the PID controller is good or not. Referring to Fig. 2C, the user can select the PID control mode in the determination selection field 401. [ Thereafter, the characteristic waveform corresponding to the selected PID control mode is output (403), and the user can confirm the result of the determination 405 of the PID controller.

3 shows an apparatus 50 for checking the function of a PID controller according to another embodiment of the present invention. The function check device of the PID controller includes a slot 501 in which the PID controller is mounted; And a processor having a program for checking the function of the PID controller described above with reference to FIGS. 1 and 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the following claims.

S10: (a) the information input step of the PID controller
S20: (b) Control variable setting step
S201: Read step before checkout
S203: Change setting value of control variable
S205: Read after check step
S30: Input instruction value setting step
S40: Judgment step of the PID controller
S401: judgment selection step
S403: Waveform output step
S50: Steps to create report

Claims (5)

In a program for checking the function of a PID controller,
(a) receiving information of the PID controller;
(b) setting a control variable for a proportional gain, a differential gain, or an integral gain of a signal input to the PID controller;
(c) setting an input indication value corresponding to a signal input to the PID controller; And
(d) checking PID control of the input indication value of the control variable to determine whether the PID controller is good or not.
The method of claim 1, wherein the step (b)
A pre-check reading step of checking a control variable initially set in the PID controller;
A setting value changing step of changing a value of the control variable; And
And a post-check reading step of checking the changed control variables in the changing step.
The method according to claim 1,
Wherein the input indication value is a plurality of input indication values.
The method of claim 1, wherein the step (d)
A decision selection step of selecting a PID control mode for the input indication value; And
And a waveform output step of generating an output waveform corresponding to the PID control mode.
An apparatus for checking the function of a PID controller,
A slot in which the PID controller is mounted; And
And a processor for checking the function of the PID controller,
The processor comprising:
(a) receiving information of the PID controller,
(b) setting a control variable for a proportional gain, a differential gain, or an integral gain of a signal input to the PID controller;
(c) setting an input indication value corresponding to a signal input to the PID controller; And
(d) checking the PID control for the input indication value of the control variable to determine whether the PID controller is good or not.

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