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A method and device for detecting the degree of valve stickiness

A degree of viscosity technology, applied in the field of detection of valve viscosity, can solve the problems of large amount of calculation and time-consuming, and achieve the effect of improving accuracy

Active Publication Date: 2017-12-19
ZHEJIANG SUPCON SOFTWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this detection method requires ellipse fitting, so the amount of calculation is relatively large and time-consuming

Method used

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  • A method and device for detecting the degree of valve stickiness
  • A method and device for detecting the degree of valve stickiness
  • A method and device for detecting the degree of valve stickiness

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Experimental program
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Embodiment Construction

[0057] A control loop, such as a PID (proportional-integral-derivative) control loop mainly includes three parts: a detection device, a controller, and a valve. Among them, the detection device is used to detect the controlled object to obtain the detection value PV (such as liquid level, pressure, etc.), and the controller is used to compare the set value SP with the detection value PV, and generate the threshold value OP according to the comparison result, the threshold value OP It is used to adjust the opening degree of the valve, thereby changing the detection value PV.

[0058] As the valve works for a long time, it may become sticky. At this time, the threshold value OP generated by the controller will gradually accumulate in one direction until the action amplitude exceeds the sticky area, and the valve can produce an action output MV, resulting in a jump. Change. E.g figure 1 As shown, when the threshold value OP increases to point A, the action output MV produced by...

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PUM

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Abstract

The invention provides a method and device for detecting the viscosity of a valve, and the method comprises the steps: obtaining a detection valve set, a set value set and a threshold value set of a control loop in a preset time period; obtaining first differential value distribution which is used for representing the distribution conditions of the detection value set and the set value set; obtaining a first factor which is used for representing the nonlinear degree of the first differential value distribution; obtaining second differential value distribution which is used for representing the distribution conditions of differences between all threshold values and a mean value in the threshold value set; obtaining a second factor which is used for representing the approaching degree between the second differential value distribution and mean distribution; and obtaining the viscosity of the valve according to the first factor and the second factor, wherein the viscosity is positively correlated with the first and second factors. The method does not need to carry out ellipse fitting and other complex calculation, and can quickly detect the viscosity of the valve.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a method and device for detecting the degree of stickiness of a valve. Background technique [0002] A control loop is a commonly used control system in the field of industrial control, for example, it can be widely used in a distributed control system (DCS). The control loop mainly includes three parts: detection equipment, controller and valve. The detection equipment detects the controlled object to obtain the detection value PV (such as liquid level, pressure, etc.), the controller compares the set value SP with the detection value PV, and A threshold value OP is generated according to the comparison result, and the threshold value OP is used to adjust the opening degree of the valve. [0003] Valves generally have good performance in the initial stage of use, but as the valve works for a long time, it may be viscous. If the viscous degree of the valve is strong and it is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/04
CPCG05B19/04
Inventor 李海强王丁丁张艳辉杨开香
Owner ZHEJIANG SUPCON SOFTWARE