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Method and system for acquiring PID (Proportion Integration Differentiation) self-tuning parameter of positioner

A parameter acquisition and self-tuning technology, which is applied to complex mathematical operations, valve details, engine components, etc., can solve problems such as excessive time-consuming, complicated positioner self-tuning methods, and affecting the normal operation of controlled devices to achieve accurate records , PID parameter calculation accurate effect

Inactive Publication Date: 2016-08-03
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control valve positioner is one of the main components of the pneumatic control valve. By improving the performance of the positioner, it can play an important role in improving the characteristics of the control valve, improving the control accuracy of the control valve, and increasing the control flexibility of the control valve. Valve positioners all use PID control algorithm to control the regulating valve, but it is well known that the PID control method is easily affected by the environmental factors (such as temperature and humidity) of the controlled device, and usually the same set of PID parameters cannot be applied in different Under the environmental factors, it is necessary to readjust the PID parameters of the positioner of the control valve when the environmental factors of the controlled device (such as the control valve) change (such as the change of the season), and this process is usually called the positioner self-tuning process
The existing positioner self-tuning methods are usually too complicated and most of them take too much time, seriously affecting the normal operation of the controlled device

Method used

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  • Method and system for acquiring PID (Proportion Integration Differentiation) self-tuning parameter of positioner
  • Method and system for acquiring PID (Proportion Integration Differentiation) self-tuning parameter of positioner
  • Method and system for acquiring PID (Proportion Integration Differentiation) self-tuning parameter of positioner

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Embodiment 1

[0032] Embodiment 1: a method for obtaining locator PID self-tuning parameters, comprising the following steps,

[0033] S100: a step of adjusting the regulating valve to a preset opening degree;

[0034] S200: a step of oscillating the regulating valve up and down the preset opening according to the preset amplitude a;

[0035] S300: A step of detecting the actual opening of the regulating valve; the step of detecting the actual opening of the regulating valve includes the steps of filtering and amplifying the collected regulating valve opening information and performing AD conversion.

[0036] S400: After the regulating valve starts to oscillate and adjust, the parameters of the first three oscillating cycles are discarded and not recorded. The time t when the actual opening of the regulating valve > the preset opening in one oscillation cycle 高n , and the actual opening of the regulating valve in each oscillation cycle 低n ;

[0037] Specifically, in this step, include, ...

Embodiment 2

[0048] Embodiment 2: as figure 1 As shown, this embodiment provides a positioner PID self-tuning parameter acquisition system, including a given control module 1, a regulating valve 2, a feedback module 3, a detection and comparison module 4, a level output circuit 5 and a timer 6 connected in sequence ; The detection and comparison module 4 and the timer 6 are also connected to a calculation module 7 at the same time;

[0049] The given control module 1 is used to control the regulating valve 2 to oscillate and adjust at a preset opening up and down according to a preset amplitude;

[0050] The feedback module 3 is used to collect the actual opening of the regulating valve 2;

[0051] The detection and comparison module 4 is used to receive the actual opening degree of the regulating valve 2 fed back by the feedback module, and control the level output circuit 5 to change the output level when judging that the actual opening degree is equal to the preset opening degree; at the...

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Abstract

The invention relates to the field of intelligent control and especially relates to a method and a system for acquiring a PID (Proportion Integration Differentiation) self-tuning parameter of a positioner. A level output circuit is arranged and is used for outputting different levels according to a detected practical opening degree of an adjusting valve. An opening degree vibration period of the adjusting valve is recorded through the output time of the detected level, so that the vibrating critical period of the adjusting valve can be accurately recorded and calculated and the calculation of the PID parameter of the positioner is accurate and quick.

Description

technical field [0001] The invention relates to the field of intelligent control, in particular to a method and system for acquiring PID self-tuning parameters of a positioner. Background technique [0002] Pneumatic regulating valve is a commonly used device in industrial process control system, especially in power plant, petrochemical, metallurgy and other industrial fluid flow control, which plays an irreplaceable role. The control valve positioner is one of the main components of the pneumatic control valve. By improving the performance of the positioner, it can play an important role in improving the characteristics of the control valve, improving the control accuracy of the control valve, and increasing the control flexibility of the control valve. Valve positioners all use PID control algorithm to control the regulating valve, but it is well known that the PID control method is easily affected by the environmental factors (such as temperature and humidity) of the cont...

Claims

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Application Information

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IPC IPC(8): G06F17/10F16K31/02
CPCG06F17/10F16K31/02
Inventor 鲍鹤虎恩典周朋赵文贤刘甘霖
Owner BEIFANG UNIV OF NATITIES
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