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Undistributed switching control method for pneumatic control valve

A technology of pneumatic control valve and non-disturbing switching, applied in valve details, valve device, engine components, etc., to achieve the effect of non-disturbing switching, easy promotion, and reducing impact

Active Publication Date: 2017-07-14
CHINA NUCLEAR CONTROL SYST ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for the non-disturbance switching of a pneumatic control valve, so that when the solenoid valve operates, it will not cause a large disturbance to the system, and the transition can be smooth

Method used

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  • Undistributed switching control method for pneumatic control valve
  • Undistributed switching control method for pneumatic control valve
  • Undistributed switching control method for pneumatic control valve

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Such as image 3 As shown, in order to realize the non-disturbance switching between the solenoid valve control and the PID control, the solenoid valve control information must be introduced into the PID control.

[0020] A switching module is added in the PID control loop, and its switching signal comes from the switching state of the solenoid valve. When the solenoid valve is in the energized state, the solenoid valve is opened, the switching module does not act, and the output is still the output MV of the PID controller. When the solenoid valve is in the power-off state, the solenoid valve is closed, the switching module operates, and its output is 0% opening, which is consistent with the actual situation of the regulating valve. At the same time, the output of the switching module is introduced into the TR port of the PID contro...

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Abstract

The invention belongs to the technical field of DCS control, and particularly relates to an undisturbed switching control method for a pneumatic control valve. A switching module is added into a PID control loop, and switching signals of the switching module come from on-off states of an electromagnetic valve; when the electromagnetic valve is in a power-on state, the electromagnetic valve is opened, the switching module does not act, and output MV of a PID controller is still output; when the electromagnetic valve is in a power-off state, the electromagnetic valve is closed, the switching module acts, and the output of the switching module is the 0% opening which accords with the actual condition of the control valve; meanwhile, output of the switching module is led into a TR port of the PID controller to force the PID controller to start a tracking mode, and output MV of the PID controller is 0%; and when the electromagnetic valve is powered on again, compressed air is sent to a main control valve again, the PID controller plays the role again, at the moment, the valve opening of the main control valve is 0%, output MV of the PID controller is also 0%, the PID controller restores a normal working mode, and the valve is adjusted according to results obtained by subtracting PV from SP.

Description

technical field [0001] The invention belongs to the technical field of DCS control, and in particular relates to a control method for undisturbed switching of a pneumatic regulating valve. Background technique [0002] As the most commonly used terminal control element in the process control industry, the control valve plays an extremely important role in process control. At present, most of the regulating valves used in my country's nuclear power units are pneumatic regulating valves. In addition to the main regulating valve, the pneumatic control valve also has accessories such as electrical converters, positioners, limit switches and solenoid valves. The solenoid valve is responsible for controlling the on-off of the air circuit of the pneumatic regulating valve. By controlling the power supply of the solenoid valve through DCS, the solenoid valve can be opened or closed, thereby controlling the compressed air sent to the regulating valve. The regulating valve adopts PI...

Claims

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Application Information

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IPC IPC(8): F16K31/12F16K31/06F16K37/00
Inventor 王强钟洋李勇张方杰崔泽朋
Owner CHINA NUCLEAR CONTROL SYST ENG
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