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PID-based temperature grading control method

A hierarchical control and temperature control system technology, which is applied in the direction of temperature control using electric methods, auxiliary controllers with auxiliary heating devices, etc., can solve problems such as incoordination of temperature control

Inactive Publication Date: 2020-07-14
CHINA TOBACCO GUANGXI IND
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a PID-based temperature classification control method for the above-mentioned defects in the prior art, wherein the inconsistency of temperature control in the drying process of materials is solved by optimizing the PID parameters, and the control method is sought. The adaptability of the method in different grades and different process processing requirements

Method used

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  • PID-based temperature grading control method

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no. 1 example

[0041] Image 6 A general flow chart of the PID-based temperature hierarchical control method according to a preferred embodiment of the present invention is schematically shown.

[0042] Such as Image 6 As shown, in general, for example, the PID-based temperature hierarchical control method according to a preferred embodiment of the present invention may include:

[0043] The first step S1: detecting the percentage content of the moisture content of the shredded stems at the material outlet of the shred drying machine;

[0044] Second step S2: judging whether the percentage of moisture in the cut stems is greater than a threshold percentage; for example, the threshold percentage is 8%.

[0045] The third step S3: in the case that the percentage content of the cut stem moisture is greater than the threshold percentage value, set the proportional parameter, the integral parameter and the differential parameter of the PID controller to the first parameter combination, and then ...

no. 2 example

[0052] In another scheme, detect the percentage content of the cut stem moisture at the material outlet of the silk drying machine; Reduce the numerical value of the proportional parameter, reduce the numerical value of the integral parameter, and increase the numerical value of the differential parameter, and then make the temperature control system execute the instruction issued by the PID controller under the new parameter to regulate the steam hot air temperature; When the content changes from not greater than the threshold percentage value to greater than or equal to the threshold percentage value, increase the value of the proportional parameter of the PID controller, increase the value of the integral parameter, and decrease the value of the differential parameter, and then make the temperature control system Execute the instructions issued by the PID controller under the new parameters to regulate the steam hot air temperature.

[0053] Also, for example, the threshold...

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Abstract

The invention discloses a PID-based temperature grading control method. The method comprises the following steps of detecting the percentage content of cut stem moisture at a material outlet of a cuttobacco dryer, comparing the percentage content of the cut stem moisture with a threshold percentage value, setting a proportion parameter, an integral parameter and a differential parameter of a PIDcontroller as a first parameter combination under the condition that the percentage content of the moisture of the cut stems is greater than a threshold percentage value, so that a temperature controlsystem executes an instruction sent by the PID controller to regulate and control the temperature of steam and hot air, under the condition that the percentage content of the cut stem moisture is notgreater than the threshold percentage value, setting the proportion parameter, the integral parameter and the differential parameter of the PID controller as a second parameter combination, and enabling the temperature control system to execute an instruction sent by the PID controller to regulate and control the steam and hot air temperature, the proportion parameter in the first parameter combination being larger than that in the second parameter combination, the first parameter and the second parameter combination being the same in integration and differentiation. Continuity and stabilityof process control are kept.

Description

technical field [0001] The invention relates to the technical field of tobacco industry equipment, in particular to the flexible transformation based on the SH86 tunnel-type shred drying machine and auxiliary equipment. Background technique [0002] At present, the drying equipment for shredded leaves (stalks) in Liuzhou Cigarette Factory includes SH86 tunnel-type shredded drying machine and HDT air-flow shredded shredded drying machine, which mainly rely on the temperature of steam hot air to dry materials. Taking the SH86 tunnel-type wire drying machine as an example, after the equipment is preheated, after the first and second zones reach a fixed temperature (the first zone is 150±5°C, the second zone is 140±5°C), it will be completed automatically. After the equipment is installed, the PID controller controls the opening of the pneumatic membrane valve through the control system to keep the temperature stable. When the outlet moisture is abnormal (high or low), the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/32
CPCG05D23/32
Inventor 李文好尹辉俊
Owner CHINA TOBACCO GUANGXI IND
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