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Piezoelectric switch type valve positioner control system

A valve positioner, piezoelectric switch technology, applied in the direction of control using feedback, can solve the problems of long adjustment time, large duty cycle, oscillation, etc., to achieve smooth control, suppress valve position disturbance, and prevent overshoot.

Active Publication Date: 2012-05-30
HEFEI UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the PWM duty cycle is too large, it is easy to cause overshoot or even oscillation; otherwise, the adjustment time will be longer

Method used

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  • Piezoelectric switch type valve positioner control system
  • Piezoelectric switch type valve positioner control system
  • Piezoelectric switch type valve positioner control system

Examples

Experimental program
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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] The schematic diagram of the five-step switching method with reverse PWM in the system of the present invention is as follows figure 1 shown. The direction of the arrow in the figure indicates the direction of the gas force. When the absolute value of the error is large, use B-B control to quickly reduce the error; when the absolute value of the error is small but the rate of error change is large, use reverse PWM control to quickly reduce the rate of error change; when the absolute value of the error When the error rate is small and the error change rate is small, the positive PWM control is used to slowly approach the target value; when the valve position enters the dead zone smoothly, the control valve position is maintained. The phase plane graph of the algorithm is as follows figure 2 Shown, where the derivative of the error represents the rate of chang...

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PUM

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Abstract

The invention relates to a piezoelectric switch type valve positioner control method and a piezoelectric switch type valve positioner control system. The system consists of a 4-20mA current source, a current-to-voltage (I / V) conversion circuit, a voltage conversion module, a control signal amplifying and filtering circuit, a feedback signal amplifying and filtering circuit, 2 external analog-to-digital converter (ADC), an ultra-low power consumption singlechip, a liquid crystal keyboard module, an electrically erasable programmable read-only memory (EEPROM), a passive crystal, and a piezoelectric valve driven amplifying circuit. The control method comprises the steps of: determining the optimum pulse width modulation (PWM) duty cycle during the self-tuning of parameters; and adopting a five-step switching method with reverse PWM during the control. The piezoelectric switch type valve positioner control method and the piezoelectric switch type valve positioner control system can effectively avoid the overshoot phenomenon during the control of a valve positioner, solve the non-linear problem of an actuating mechanism, and have stronger universal applicability.

Description

technical field [0001] The invention relates to the field of pneumatic control valves, and is a control method and system for an intelligent electric valve positioner, in particular a five-step switch with an ultra-low power consumption single-chip microcomputer (MCU) as the core and with reverse PWM (pulse width modulation) A method and system for a piezoelectric switch type valve positioner combining method and parameter self-tuning. Background technique [0002] With the rapid development of chemical industry, metallurgy, electric power and pharmaceutical industries, higher requirements are put forward for the important part in the whole process control - pneumatic control valve. As the brain of the pneumatic control valve, the valve positioner plays a decisive role in the control performance and field functions of the entire control valve. According to the deviation between the control signal (such as 4 ~ 20mA DC signal) and the valve position feedback signal, it contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D3/12
Inventor 徐科军姜鹏王沁王刚蒋浩陈学军付健胡小玲
Owner HEFEI UNIV OF TECH
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