Method capable of increasing PID (proportion integration differentiation) control speed and precision

A technology to control speed and accuracy, applied in the field of automatic control, can solve the problems of system static and dynamic characteristics deterioration, slow response speed, prolong adjustment time, etc., to achieve the effect of eliminating external interference, eliminating vibration, and reducing overshoot.

Inactive Publication Date: 2015-09-30
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The larger the proportional gain coefficient, the faster the response speed of the system and the higher the adjustment accuracy of the system, but it is easy to produce overshoot and even cause the instability of the system; if the value of the proportional gain coefficient is too small, the adjustment accuracy will be reduced, making the response The speed is slow, thus prolonging the adjustment time, which is the deterioration of the static and dynamic characteristics of the system

Method used

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  • Method capable of increasing PID (proportion integration differentiation) control speed and precision
  • Method capable of increasing PID (proportion integration differentiation) control speed and precision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for improving PID control speed and precision, comprising the following steps:

[0027] A. When the PID controller starts to work, adjust the proportional gain coefficient (GAIN) in the PID controller every 100 milliseconds;

[0028] B. The adjustment process of the proportional gain coefficient (GAIN) is to adjust the proportional gain coefficient (GAIN) from large to small;

[0029] C. While adjusting the proportional gain coefficient (GAIN), the output upper limit value (LMN_HLM) and the output lower limit value (LMN_LLM) should also be adjusted respectively;

[0030] D. The adjustment process of output upper limit value (LMN_HLM) and output lower limit value (LMN_LLM) is that the difference between output upper limit value and output lower limit value decreases from large to small.

[0031] Such as figure 2 As shown, GAIN represents the proportional gain coefficient, LMN_HLM represents the output upper limit value, LMN_LLM represents the output lower lim...

Embodiment 2

[0034] A method for improving PID control speed and precision, comprising the following steps:

[0035] A. When the PID controller starts to work, adjust the proportional gain coefficient in the PID controller every 100 milliseconds;

[0036] B. In the process of adjusting the proportional gain coefficient, it is necessary to obtain the input value of the proportional gain coefficient through calculation;

[0037] C. First, the absolute value of the deviation between the given value (SP_INT) and the feedback value (PV_IN) is divided by 120 to obtain the intermediate variable;

[0038] D. Then judge the intermediate variable, take 6.0 when DIV_Data is greater than 6.0, otherwise it will remain unchanged;

[0039] E. Finally, add 1.45 to the determined intermediate variable to obtain the proportional gain coefficient (GAIN) in this adjustment cycle of the PID controller;

[0040] F. While adjusting the proportional gain coefficient (GAIN), the output upper limit value (LMN_HLM...

Embodiment 3

[0044] A method for improving PID control speed and precision, comprising the following steps:

[0045] A. When the PID controller starts to work, adjust the proportional gain coefficient in the PID controller every 100 milliseconds;

[0046] B. In the process of adjusting the proportional gain coefficient, it is necessary to obtain the input value of the proportional gain coefficient through calculation;

[0047] C. First, the absolute value of the deviation between the given value (SP_INT) and the feedback value (PV_IN) is divided by 120 to obtain the intermediate variable;

[0048] D. Then judge the intermediate variable, when the intermediate variable is greater than 6.0, take 6.0, otherwise it will remain unchanged;

[0049] E. Finally, add 1.45 to the determined intermediate variable to obtain the proportional gain coefficient (GAIN) in this adjustment cycle of the PID controller;

[0050]F. While adjusting the proportional gain coefficient (GAIN), the output upper lim...

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Abstract

The invention relates to the field of automatic control, particularly to a method capable of increasing the PID (proportion integration differentiation) control speed and precision, and aims to provide a method which is high in response speed, small in overshoot and capable of increasing the PID (proportion integration differentiation) control speed and precision. The method comprises steps as follows: A, when a PID controller begins to work, the proportional gain coefficient of the PID controller is adjusted once every 1,100 milliseconds; B, during adjustment of the proportional gain coefficient, the proportional gain coefficient is adjusted as per the law that the coefficient is decreased progressively; C, the upper output limit value and the lower output limit value are adjusted respectively while the proportional gain coefficient is adjusted; D, during adjustment of the upper output limit value and the lower output limit value, the difference between the upper output limit value and the lower output limit value is decreased progressively. The method has the advantages as follows: the control precision is increased while the control response speed is increased, and the overshoot is reduced; the dynamic response of a system is improved, and shocks caused by frequent actions are eliminated.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a method capable of improving the speed and precision of PID control. Background technique [0002] In automatic control system, PID controller is the most commonly used controller. The PID controller forms the deviation value according to the given value and the feedback value, and the proportion, integral and differential of the deviation value are combined linearly to form the control quantity to control the controlled object. [0003] The current PID control method has the following disadvantages: For the proportional gain coefficient, the function of the proportional gain coefficient in the ordinary PID digital controller is to speed up the response speed of the system and improve the adjustment accuracy of the system. The larger the proportional gain coefficient, the faster the response speed of the system and the higher the adjustment accuracy of the system, but it is eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/32
Inventor 王其军
Owner SOUTHWEST PETROLEUM UNIV
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