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Method for controlling piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio

A technology of a valve positioner and a control method, which is applied in the direction of valve devices, engine components, mechanical equipment, etc., can solve the problems of large number of forward PWM pulses, slow valve position start process, and long adjustment time, so as to speed up the control process , Accelerate the start-up process of the valve position and reduce the adjustment time

Active Publication Date: 2013-07-10
HEFEI UNIV OF TECH
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Problems solved by technology

Therefore, the starting process of the valve position is slow, and the number of positive PWM pulses required is large, resulting in a long adjustment time

Method used

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  • Method for controlling piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio
  • Method for controlling piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio
  • Method for controlling piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] In the five-step switching method with reverse PWM, according to the size of the valve position error and the error change rate (that is, the valve position speed), the control process is divided into: fast zone, deceleration zone, fine-tuning zone and dead zone, and in the Different control strategies are adopted in corresponding areas. The specific working process is: when the absolute value of the error is large, that is, when the valve position is in the fast zone, B-B control is used to quickly reduce the error; when the absolute value of the error is small, but the valve position speed is large, that is, the valve position is in the falling position In the speed zone, use reverse PWM speed reduction control to quickly reduce the valve position speed; Closely approach the target position; when the valve position smoothly enters the dead zone, the control v...

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Abstract

The invention relates to a method for controlling a piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio. A software system is formed by a main monitoring program module, an initializing module, a parameter self-tuning module, a valve position control module, a man-machine interaction module, an interrupt processing module, an EEPROM (electrically erasable programmable read-only memory) storage module and a watchdog module. Positive PWM duty ratio is changed by adding a five-step switch method with negative PWM into a sectional PI method or a linearization method, and when the control method is applied to small-range step control, positive PWM pulses with big duty ratio can be obtained, valve position starting process can be accelerated, the number of positive PWM pulses and adjusting time of small-range step control can be reduced, and small-range step control process can be accelerated.

Description

technical field [0001] The invention relates to the field of pneumatic regulating valves, and is an intelligent electric valve positioner control method, in particular a reverse PWM with ultra-low power consumption single-chip microcomputer (MCU) as the core and variable PWM (pulse width modulation) duty cycle The five-step switching method of the piezoelectric valve positioner control method. Background technique [0002] Pneumatic control valve is composed of valve positioner, pneumatic actuator and control valve. It is one of the important equipments in the process control system. And other production occasions. As the control core of the pneumatic control valve, the valve positioner plays a decisive role in the work of the pneumatic control valve. Valve positioners can be divided into nozzle baffle type and piezoelectric type according to their working principle. Among them, the piezoelectric valve positioner is made of the principle that the ceramic sheet of the piez...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K37/00
Inventor 徐科军杨庆庆胡小玲任保宏
Owner HEFEI UNIV OF TECH
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