CN101571703B - PID controller provided with upper and lower limit switch control - Google Patents
PID controller provided with upper and lower limit switch control Download PDFInfo
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- CN101571703B CN101571703B CN2009100863113A CN200910086311A CN101571703B CN 101571703 B CN101571703 B CN 101571703B CN 2009100863113 A CN2009100863113 A CN 2009100863113A CN 200910086311 A CN200910086311 A CN 200910086311A CN 101571703 B CN101571703 B CN 101571703B
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- output
- pid controller
- controlled
- control
- device temperature
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Abstract
The invention belongs to a PID control and mainly relates to a PID controller provided with upper and lower limit switch control. The PID controller provided with the upper and the lower limit switch control is different from the traditional PID controller, and the PID controller comprises three outputs which are an analog quantity output, an upper limit switch quantity output and a lower limit switch quantity output. The traditional PID controller module has no switch quantity output. When an alarm output is needed, a control system generally adopts a PLC module for completing the alarm output. But the addition of the PLC module not only leads the system to be complicated, but also increases the cost, while the PID controller provided with the upper and the lower limit switch control integrates the alarm output function, thereby simplifying the control system.
Description
The present invention relates to a kind of PID controller, can be used for the occasion of process control, particularly shop equipment thermostatic control with the control of bound switch.
Background technology
Adopt process control in a large number in process of factory production, generally adopt PID control for process control.Usually run into the demand of the output of reporting to the police in actual production, promptly when controlled volume surpasses bound, need the output switching value to start other elements or equipment, the output of reporting to the police is generally switching value output, and traditional PID controller module does not have switching value output.When warning output demand was arranged, control system often adopted the PLC module to finish the output of reporting to the police.
The control system that adds the PLC module, complex structure, cost improves.The PID controller integrated switch control function of band bound switch control of the present invention has been simplified The whole control system.
Summary of the invention
The objective of the invention is: a kind of PID controller with the control of bound switch is provided, has switch control functions.
Technical scheme of the present invention is:
1. be with the PID controller principle of bound switch control
Fig. 1 is the PID controller of band bound switch control, and it is characterized in that: this PID controller has 3 outputs, comprises an analog quantity output, a upper limit switching value output, a limit switch amount output.
When being higher than working range (L--H), the controlled volume (x) of controlled device is lower than higher limit (H
0), that is:
As H＜x＜H
0The time, the PID controller is converted into analog quantity then according to deviation (e) calculation control amount, and by analog quantity output, control ratio output element output controlled quentity controlled variable is given controlled device, and controlled volume reduces;
As x＞H
0The time, PID controller output switching value upper control limit on-off element is opened, and the output controlled quentity controlled variable is given controlled device, and controlled volume reduces;
When being lower than working range, controlled volume is higher than lower limit (L
0), that is:
Work as L
0During＜x＜L, the PID controller is converted into analog quantity then according to deviation (e) calculation control amount, and by analog quantity output, control ratio output element output controlled quentity controlled variable is given controlled device, and controlled volume increases;
As x＜L
0The time, PID controller output switching value lower control limit on-off element is opened, and the output controlled quentity controlled variable is given controlled device, and controlled volume increases.
Controlled volume is stabilized in the working range.
Advantage of the present invention is: use the PID controller of band bound switch control, control system need not to adopt the PLC module just can carry out bound warning output again, has simplified system architecture, has reduced cost.
Description of drawings
Fig. 1 is the PID controller system block scheme of band bound switch control.
Fig. 2 is the PID controller temperature control system schematic diagram that adopts the control of band bound switch.
1. proportional flow control valve; 2. solenoid valve; 3 well heaters; 4. temperature sensor; 5. throttling valve
Embodiment
Below the present invention is further illustrated.
Fig. 2 adopts the PID controller temperature control system schematic diagram of band bound switch control.
Be the opertaing device temperature, introduce the PID controller of band bound switch control.
When being higher than working range (L--H), device temperature (T) is lower than higher limit (H
0), that is:
As H＜T＜H
0The time, the PID controller is according to deviation (e) calculation control amount, be converted into analog quantity then, export by analog quantity, control ratio flow valve (1) increases valve port, and the warm water flow that flows out the equipment water-flow circuit from proportional flow control valve (1) increases, and flows into the cooling water flow increase of equipment water-flow circuit simultaneously from throttling valve (5), cooling effect is strengthened, and device temperature reduces;
As x＞H
0The time, PID controller output switching value control electromagnetic valve (2) is opened, and the cooling water flow that flows into the equipment water-flow circuit from solenoid valve (2) increases, and cooling effect is strengthened, and device temperature reduces;
When being lower than working range, device temperature is higher than lower limit (L
0), that is:
Work as L
0During＜T＜L, the PID controller is according to deviation (e) calculation control amount, be converted into analog quantity then, export by analog quantity, control ratio flow valve (1) reduces valve port, and the warm water flow that flows out the equipment water-flow circuit from proportional flow control valve (1) reduces, and the cooling water flow from throttling valve (5) inflow equipment water-flow circuit reduces simultaneously, cooling effect weakens, and device temperature raises;
As x＜L
0The time, PID controller output switching value control heater (3) is opened, and equipment water-flow circuit water temperature rises, and device temperature raises.Device temperature is stabilized in the working range.
Claims (1)
1. be with the PID controller of bound switch control, it is characterized in that: this PID controller has 3
Output comprises an analog quantity output, a upper limit switching value output, a limit switch amount output;
When being higher than working range L--H, the controlled volume device temperature x of controlled device is lower than higher limit H
0, that is:
As H＜x＜H
0The time, the PID controller is converted into analog quantity then according to deviation e calculation control amount, by analog quantity output, controls this routine output element output controlled quentity controlled variable and gives controlled device, and the controlled volume device temperature reduces;
As x＞H
0The time, PID controller output upper limit switching value upper control limit on-off element solenoid valve (2) is opened, and with condensate water introducing equipment water-flow circuit, the controlled volume device temperature reduces;
When being lower than working range, the controlled volume device temperature is higher than lower limit L
0, that is:
Work as L
0During＜x＜L, the PID controller is converted into analog quantity then according to deviation e calculation control amount, by analog quantity output, controls this routine output element output controlled quentity controlled variable and gives controlled device, and the controlled volume device temperature increases;
As x＜L
0The time, PID controller bottoming switching value lower control limit on-off element well heater (3) is opened, heat cycles water, and the controlled volume device temperature increases;
The controlled volume device temperature is stabilized in the working range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100863113A CN101571703B (en) | 2009-06-10 | 2009-06-10 | PID controller provided with upper and lower limit switch control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100863113A CN101571703B (en) | 2009-06-10 | 2009-06-10 | PID controller provided with upper and lower limit switch control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571703A CN101571703A (en) | 2009-11-04 |
| CN101571703B true CN101571703B (en) | 2011-09-28 |
Family
ID=41231076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100863113A Expired - Fee Related CN101571703B (en) | 2009-06-10 | 2009-06-10 | PID controller provided with upper and lower limit switch control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101571703B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529700B (en) * | 2012-07-06 | 2017-07-04 | 安川电机（中国）有限公司 | For the control device and control method of reponse system, and reponse system |
| CN108227477B (en) * | 2017-12-06 | 2020-12-29 | 中国飞机强度研究所 | Self-adaptive PID control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048609A (en) * | 1989-07-07 | 1991-01-16 | 东芝株式会社 | The control device that is used for the process detection system |
| CN2444996Y (en) * | 2000-08-28 | 2001-08-29 | 杨森 | Intelligent constant-pressure water supply equipment control device |
| US7035695B2 (en) * | 2002-01-22 | 2006-04-25 | Imb Controls Inc. | Method and apparatus for tuning a PID controller |
-
2009
- 2009-06-10 CN CN2009100863113A patent/CN101571703B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048609A (en) * | 1989-07-07 | 1991-01-16 | 东芝株式会社 | The control device that is used for the process detection system |
| CN2444996Y (en) * | 2000-08-28 | 2001-08-29 | 杨森 | Intelligent constant-pressure water supply equipment control device |
| US7035695B2 (en) * | 2002-01-22 | 2006-04-25 | Imb Controls Inc. | Method and apparatus for tuning a PID controller |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2000-56801A 2000.02.25 |
| 王威等.智能PID控制方法的研究现状及应用展望.《自动化仪表》.2008,第29卷(第10期),第1-3，7页. * |
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| Publication number | Publication date |
|---|---|
| CN101571703A (en) | 2009-11-04 |
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