Multifunctional process control experiment platform

A process control and experimental platform technology, applied in non-electric variable control, control/regulation systems, and simultaneous control of multiple variables.

Inactive Publication Date: 2014-04-09
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of coupling between variables, when adjusting the controller parameters of a certain control loop to change the output of the control loop, the output of other control loops will also change accordingly, which often leads to poor control effects of the control system , and even lead to the failure of the entire control system
Research on decoupling control for strongly coupled systems has broad application prospects. However, the current system lacks controlled objects with strong coupling. Although some systems have achieved state coupling of liquid levels, the input coupling has not been reflected.
In addition, there are few researches on the coupling control system of temperature and flow, and temperature and liquid level, which greatly restricts the research scope of researchers.

Method used

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  • Multifunctional process control experiment platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Decoupling control, the method is as follows:

[0058] The dual-capacity water tank liquid level control system in the normal temperature water flow circuit not only has state coupling, but also has input coupling. This embodiment takes the dual-capacity water tank liquid level system as an example to illustrate that this platform has good decoupling capabilities.

[0059] Figure 8 It can be seen that when the connecting valve between the double-capacity water tanks is opened, the liquid levels of No. 1 water tank and No. 2 water tank will interact with each other through the pressure difference, thus having a liquid level coupling relationship; because in the liquid level system of the double-capacity water tanks, the water always enters The flow comes from the water pumped by the No. 2 water pump from the water storage tank, so adjusting the proportional valve will not only directly affect the water flow of the No. 1 water tank, but also indirectly affect the water f...

Embodiment 2

[0071] Single-capacity water tank temperature control, the method is as follows:

[0072] The single-capacity water tank temperature control system is composed of a heating water tank 2 and a No. 1 temperature sensor 6. The No. 1 temperature sensor measures the temperature in the heating water tank; the PI controller parameter corresponding to the No. 1 temperature sensor is k p =0.3378,k i =5.347×10 -5 , the set value of the water temperature is 50°C, the temperature control curve of the heating water tank is as follows Figure 13 shown. It can be seen from the figure that the temperature in the heating water tank can reach and stabilize at a given temperature in a short period of time, and the overshoot is extremely small, which has a good control effect. It also shows that the system structure can realize the temperature control of a single-capacity water tank experiment.

Embodiment 3

[0074] Heat exchange circuit temperature control, the method is as follows:

[0075] The heat exchange circuit is composed of No. 1 water pump 9, heating water tank 2, heat exchanger 22, No. 1 water tank 13 and No. 3 temperature sensor 35. Among them, No. 3 temperature sensor is used to measure the temperature of the water in the No. 1 water tank, and the 1 The liquid level in the No. water tank is kept at 10cm, and the PWM duty cycle of the first water pump is set to 60%. At the same time, the PI controller corresponding to the No. 1 temperature sensor is used to keep the temperature in the heating water tank at 45°C, so that the heat in the heat exchanger The temperature response curve in the No. 1 water tank detected by the No. 3 temperature sensor is shown in Figure 14; it can be seen from the figure that the temperature in the No. 1 water tank can reach and stabilize at 43.5°C through heat exchange, indicating that the loop structure can Realize the heat exchange experime...

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Abstract

A multifunctional process control experiment platform, which relates to a process control system, is disclosed. A control loop of the multifunctional process control experiment platform can be used alone or in combination. Single and combined control of four indexes: a liquid level, flow, a temperature and a pressure can be realized. The control loop can be used in a single variable experiment, a multivariable experiment, fuzzy control, fault diagnosis, fault-tolerant control, and multivariable non-linear decoupling control.

Description

technical field [0001] The invention relates to a process control system, in particular to a multifunctional process control experiment platform. Background technique [0002] Process control in industry mainly involves four types of controlled variables: temperature, liquid level, pressure and flow. The corresponding theoretical and experimental research has extremely high application value for safe and effective industrial production. At present, the controlled objects of most process control platforms can only To complete a certain type of control, for example, the existing single-capacity water tank temperature control system and three-capacity or even four-capacity water tank liquid level control system can only perform individual control of temperature or liquid level, and cannot realize liquid level, flow, temperature and Joint control of typical variables such as pressure. Moreover, the controlled objects of most industrial processes are multiple-input and multiple-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D27/02
Inventor 王良勇宋君男侯俊王宏迟瑛
Owner NORTHEASTERN UNIV LIAONING
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