CN107606284A - The regulating valve for controlling to adjust the method for valve using PWM and being controlled based on PWM - Google Patents
The regulating valve for controlling to adjust the method for valve using PWM and being controlled based on PWM Download PDFInfo
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- CN107606284A CN107606284A CN201710621966.0A CN201710621966A CN107606284A CN 107606284 A CN107606284 A CN 107606284A CN 201710621966 A CN201710621966 A CN 201710621966A CN 107606284 A CN107606284 A CN 107606284A
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- regulating valve
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Abstract
The invention discloses the regulating valve that the method for valve is controlled to adjust using PWM and is controlled based on PWM, the control system of the regulating valve obtains pwm signal according to regulating valve target flow characteristic curve, opening or closing for valve is controlled to adjust by pwm signal, the target flow characteristic curve can be arbitrary curve, so that regulating valve has any discharge characteristic, can dynamically meet any traffic demand, adapt to increasingly personalized application demand, applied widely, degree of regulation is high, and manufacturing cost is cheap.
Description
Technical field
The present invention relates to the control technology field of regulating valve, more particularly to the method for valve is controlled to adjust using PWM and is based on
The regulating valve of PWM controls.
Background technology
Regulating valve also known as control valve, in industrial automation process control field, exported by receiving regulation unit
Control signal, go to change rate-of flow, pressure, temperature, the technological parameter such as liquid level by power operation, modern plant from
Played a very important role in dynamic control.Regulating valve is made up of control system, executing agency and valve body, is moved according to executing agency
Power is divided into pneumatic control valve, electric control valve and hydraulic adjusting valve, because pneumatic, electronic or hydraulic actuating mechanism regulation acts
Delay, precision are low and the characteristics of low discharge valve is difficult to accurately control in itself, existing regulating valve by its function and characteristic again
It is divided into linear characteristic, equal percentage characteristics and parabolic characteristic.These three discharge characteristics can meet most of engineer applied
It is required that but for currently increasingly personalized application demand, it is desirable to provide there is the regulating valve of any discharge characteristic, dynamic meets
The demand of any flow.
The content of the invention
It is an object of the invention to provide the regulating valve that the method for valve is controlled to adjust using PWM and is controlled based on PWM, solve
Above-mentioned technical problem, using the opening for decomposing the pwm signal control and regulation valve valve port that regulating valve target flow characteristic curve obtains
Or close, obtain the regulating valve with any discharge characteristic.
In order to solve the above technical problems, the present invention uses following technical scheme:
The method that valve is controlled to adjust using PWM, it is characterised in that comprise the following steps:
S1, control system generate pwm signal according to regulating valve target flow characteristic curve;
S2, the action of control system output pwm signal control executing agency, executing agency's band moving valve are acted, controlled to adjust
Valve opens or closes.
Especially, the step S1 comprises the following steps:
S11, control system calculate regulation valve regulating flow Δ Q, Δ Q=Q-Q ', wherein,
Q is regulating valve target flow, is obtained according to regulating valve target flow characteristic curve;Q ' is regulating valve actual flow,
Obtained by transmitter;
S12, Δ Q is sent into PID controller input, compensating flowrate δ Q are obtained in PID controller output end;
S13, by δ Q be sent into PWM controller input, PWM controller output end obtain pwm signal.
Especially, the step S2 comprises the following steps:
S21, control system output pwm signal control electromagnet produce or eliminated electromagnetic attraction;
S22, electromagnet band movable valve plug carry out back and forth movement;
S23, valve element action control regulating valve open or close.
Above-mentioned side is used based on the regulating valve of PWM controls, including valve body, executing agency and control system, the regulating valve
Method is controlled.
Especially, the valve body includes valve seat and valve element, and valve seat, which is provided with, is used for the opening that medium passes through, and valve element is with performing
Mechanism connects, and control system controls executing agency's action, and executing agency's band movable valve plug carries out back and forth movement, closure or opening valve seat
On opening.
Especially, the executing agency includes connecting rod, spring and electromagnet, connecting rod one end connection valve element, other end connection
Spring, control system control electromagnet are powered.
The present invention proposes a kind of regulating valve for being controlled to adjust the method for valve using PWM and being controlled based on PWM, with existing skill
What art was compared has the beneficial effect that:
The regulating valve has any discharge characteristic, can dynamically meet any traffic demand, adapts to increasingly personalization
Application demand, applied widely, precision is high, and cost is cheap.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the method flow diagram that valve is controlled to adjust using PWM that the embodiment of the present invention 1 provides.
Fig. 2 is the method flow that pwm signal is generated according to regulating valve target flow curve that the embodiment of the present invention 1 provides
Figure.
Fig. 3 is the method flow opened or closed according to pwm signal control and regulation valve valve port that the embodiment of the present invention 1 provides
Figure.
Fig. 4 be the embodiment of the present invention 1 provide be by curve separating contour, not wide rectangle schematic diagram.
Fig. 5 is the regulating valve valve body structure figure based on PWM controls that the embodiment of the present invention 2 provides.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
The discharge characteristic of regulating valve refer to valve both ends pressure difference keep it is constant under conditions of, the adjusted valve of medium flow field it is relative
Relation between flow and its aperture, it is the important indicator for weighing regulation valve performance.The limitation of modulated valve actuating mechanism, it is existing
The discharge characteristic of some regulating valves includes linear, equal percentage and parabola.In engineer applied, different application scenario and right
The discharge characteristic of valve has different requirements, and staff will generally according to site technique pipe condition, system Control platform
Ask and system loading situation selects the regulating valve with corresponding discharge characteristic.Linearly, three kinds of streams of equal percentage and parabola
The regulating valve of flow characteristic disclosure satisfy that most application demand, but the application environment of current regulating valve is increasingly complicated, for adjusting
That saves the discharge characteristic of valve will go also increasingly personalization, it is desirable to provide have the regulating valve of any discharge characteristic, dynamic meets to appoint
The demand of meaning flow.
The regulating valve that the present embodiment solves the problems, such as to obtain arbitrary curve characteristic using following methods, as shown in figure 1, Fig. 1
The method flow diagram that valve is controlled to adjust using PWM provided for the embodiment of the present invention 1.
The method that valve is controlled to adjust using PWM is comprised the following steps:
S1, control system generate pwm signal according to regulating valve target flow characteristic curve.
The rating curve of regulating valve is the curve for reacting flow characteristics of regulating valve, and the present embodiment is installed according to regulating valve
Site technology requirement, sets the target flow characteristic curve of matching, and the curve can have any shape.Any curve can
Contour, not wide rectangle is infinitely decomposed into, according to the principle, the present embodiment is unlimited by the target flow characteristic curve of regulating valve
Be decomposed into several contour, not wide rectangles, as shown in figure 4, Fig. 4 be the embodiment of the present invention 1 provide be by curve separating
The schematic diagram of contour, not wide rectangle.The target flow characteristic curve of regulating valve, then can should as shown in curve in a figures
Curve is decomposed, and is realized with contour, the not wide rectangle of several in b figures.According to after decomposition several are contour,
Pulsewidth modulation (Pulse Width Modulation, PWM) control signal corresponding to wide rectangle acquisition.It should be noted that
According to the characteristic difference of target flow, the width of the contour not wide rectangle of acquisition is corresponding to be changed, the pwm signal of acquisition
The on or off time corresponding change.
S2, the action of control system output pwm signal control executing agency, executing agency's band moving valve are acted, controlled to adjust
Valve opens or closes.
The action of pwm signal control executing agency, executing agency are further driven to valve body action, control to adjust valve valve port and be in
State is opened or closed, realizes the break-make of medium at valve port.The pwm control signal of the regulating valve comes from the target of regulating valve
Rating curve, therefore, for arbitrary target flow characteristic curve, generate corresponding pwm signal control valve port
Open or close the regulating valve of any discharge characteristic corresponding to can obtaining.It should be noted that according to the conducting of pwm signal or
The difference of turn-off time, then the time corresponding change that regulating valve valve port opens or closes, so as to the discharge characteristic of the regulating valve
Corresponding change.
Specifically, regulation valve core aperture area is represented with A, regulating valve valve port opening time is represented with t, regulating valve flow
Represent then there is equation below with Q:
Q=A*t
As shown from the above formula, regulating valve any time flow Q value can be represented with switch time t, in this way, according to
Regulating valve practical application request, presets the target flow characteristic curve of regulating valve, and the target flow specific curves can be to appoint
Meaning curve, the target flow Q of regulating valve corresponding to acquisition, with reference to regulation valve core aperture area A, acquisition valve port can be calculated and beaten
ETAD expected time of arrival and departure t, the actual flow of regulating valve target stream can be adjusted to according to the opening/closing time of the t duty control solenoid valves of calculating
Amount, and then realize that regulating valve works according to default rating curve.
The preferred embodiment of the present embodiment is that the step S1 specifically includes following steps:
As shown in Fig. 2 Fig. 2 is to generate pwm signal according to regulating valve target flow curve described in the embodiment of the present invention 1
Flow chart.
The step S1 comprises the following steps:
S11, control system calculate regulation valve regulating flow Δ Q, Δ Q=Q-Q ', wherein,
Q is regulating valve target flow, is obtained according to regulating valve target flow characteristic curve;Q ' is regulating valve actual flow,
Obtained by transmitter.
The control system of regulating valve uses single-chip microcomputer or PLC, and regulating valve is provided with transmitter, for obtaining the reality of regulating valve
Border flow Q ', and control system is sent it to, meanwhile, (it can be inputted by outside input by network remote or by existing
PC, operation keyboard etc.) or control system inner setting regulating valve target flow characteristic curve, according to the target flow of setting
Characteristic curve obtains regulating valve target flow Q, and control system calculates regulation valve regulating flow Δ Q by formula Δ Q=Q-Q '.
S12, Δ Q is sent into PID controller input, compensating flowrate δ Q are obtained in PID controller output end;
PID controller is provided with inside control system, the regulation flow Δ Q that step S11 is calculated to the regulating valve obtained is sent into
PID controller input, by PID arithmetic, regulating valve compensating flowrate δ Q are obtained in PID controller output end.
S13, by δ Q be sent into PWM controller input, PWM controller output end obtain pwm signal.
PWM controller is provided with inside control system, step S12 is calculated to the regulating valve compensating flowrate δ Q obtained and is sent into PWM
Controller input, by PWM computings, pwm signal is obtained in PWM controller output end.PWM (pulse width modulation) is to utilize
The numeral output of microprocessor come a kind of very effective technology for being controlled to analog circuit, be widely used in from measurement,
Communicate into many fields of Power Control and conversion.
The preferred embodiment of the present embodiment is that the step S2 specifically includes following steps:
As shown in figure 3, Fig. 3 is being opened or closed according to pwm signal control and regulation valve valve port for the offer of the embodiment of the present invention 1
Method flow diagram.
The step S2 comprises the following steps:
S21, control system output pwm signal control electromagnet produce or eliminated electromagnetic attraction;
Electromagnet is provided with regulating valve, control system controls electromagnet to be powered or power off according to pwm signal, pwm signal
Dutycycle is electromagnet on/off electricity time ratio, and when pwm signal is 1, control system controls to adjust the electromagnetism Tie Tong in valve
Electricity, produce suction;When pwm signal is 0, control system controls to adjust the electromagnet power-off in valve, eliminates magnetic force.
S22, electromagnet band movable valve plug carry out back and forth movement;
Electromagnet on/off electricity, drives regulation valve core back and forth movement.
S23, valve element action control regulating valve open or close.
When electromagnet energization produces suction, regulation valve core action, regulating valve valve port is opened, flow of media;Electromagnet breaks
When electromagnetic force eliminates, regulation valve core counteragent, regulating valve valve port is closed, and blocks flow of media.
Embodiment 2
The present embodiment 2 discloses the regulating valve based on PWM controls, and the regulating valve is controlled using described in embodiment 1 using PWM
The method of regulating valve processed is controlled.
Regulating valve described in the present embodiment includes valve body, executing agency and control system, the control system and executing agency
Electrical connection, the executing agency mechanically connect with valve body.Staff sets regulating valve target flow according to field application situation
Characteristic curve, control system generate corresponding pwm signal control executing agency action using the method described in embodiment 1, performed
Mechanism band moving valve acts, so as to control to adjust opening or closing for valve.
As shown in figure 5, the regulating valve valve body structure figure based on PWM controls that Fig. 5, which is the embodiment of the present invention 2, to be provided.
The preferred embodiment of the present embodiment is that the regulation valve body includes valve seat and valve element, and valve seat is provided with multiple
The opening passed through for medium, valve element are connected with executing agency, and control system control executing agency action, executing agency drives valve
Core carries out back and forth movement, blocks or open the opening on valve seat.When opening on valve seat is opened, flow of media;Opening on valve seat
When mouth is blocked by valve element, flow of media is blocked.It should be noted that the quantity of valve seat opening and the size of aperture area determine to adjust
The degree of regulation of valve is saved, the quantity of opening is more, the smaller then degree of regulation of aperture area is higher, conversely, then degree of regulation is lower.
The preferred embodiment of the present embodiment is that the executing agency includes connecting rod, spring and electromagnet, and connecting rod one end connects
Connect valve element, other end connecting spring.Control system output pwm signal control electromagnet is powered, when pwm signal is high level, electricity
Magnet obtains electric, spring compression, drivening rod action, is further driven to valve element and acts, the opening on valve seat is opened, flow of media;
When pwm signal is low level, electromagnet dead electricity, spring reset, drivening rod reset, it is further driven on valve element closure valve seat
Opening, block flow of media.The pwm signal obtains according to regulating valve target flow characteristic curve, therefore believes as control
Number control and regulation valve valve port opens or closes, and can realize that regulating valve works according to the target flow characteristic of setting.Meanwhile institute
State target flow characteristic curve can have any shape, therefore the regulating valve with any discharge characteristic can be obtained.
Technical scheme, arbitrary curve is preset as regulating valve target flow characteristic curve, according to target flow
Characteristic curve obtains pwm signal, and opening or closing for valve is controlled to adjust by pwm signal, so that regulating valve has arbitrarily
It discharge characteristic, can dynamically meet any traffic demand, adapt to increasingly personalized application demand, applied widely, regulation essence
Degree is high, while the control of electro-magnet switch amount has been greatly reduced the manufacturing cost of regulating valve.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (6)
1. the method for valve is controlled to adjust using PWM, it is characterised in that comprise the following steps:
S1, control system generate pwm signal according to regulating valve target flow characteristic curve;
S2, the action of control system output pwm signal control executing agency, executing agency's band moving valve act, and control to adjust valve
Open or close.
2. it is according to claim 1 using PWM control to adjust valve method, it is characterised in that the step S1 include with
Lower step:
S11, control system calculate regulation valve regulating flow Δ Q, Δ Q=Q-Q ', wherein,
Q is regulating valve target flow, is obtained according to regulating valve target flow characteristic curve;Q ' is regulating valve actual flow, is passed through
Transmitter obtains;
S12, Δ Q is sent into PID controller input, compensating flowrate δ Q are obtained in PID controller output end;
S13, by δ Q be sent into PWM controller input, PWM controller output end obtain pwm signal.
3. it is according to claim 1 using PWM control to adjust valve method, it is characterised in that the step S2 include with
Lower step:
S21, control system output pwm signal control electromagnet produce or eliminated electromagnetic attraction;
S22, electromagnet band movable valve plug carry out back and forth movement;
S23, valve element action control regulating valve open or close.
4. the regulating valve based on PWM controls, it is characterised in that including valve body, executing agency and control system, the regulating valve is adopted
It is controlled with the method as described in claims 1 to 3 is any.
5. the regulating valve according to claim 4 based on PWM controls, it is characterised in that the valve body includes valve seat and valve
Core, valve seat, which is provided with, is used for the opening that medium passes through, and valve element is connected with executing agency, the action of control system control executing agency,
Executing agency's band movable valve plug carries out back and forth movement, blocks or open the opening on valve seat.
6. it is according to claim 5 based on PWM control regulating valve, it is characterised in that the executing agency include connecting rod,
Spring and electromagnet, connecting rod one end connection valve element, other end connecting spring, control system control electromagnet are powered.
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Cited By (3)
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CN110261105A (en) * | 2019-08-13 | 2019-09-20 | 潍柴动力股份有限公司 | A kind of scaling method and device of electric control clutch |
WO2023024510A1 (en) * | 2021-08-23 | 2023-03-02 | 维谛技术有限公司 | Control method and apparatus for opening degree of valve, and non-volatile storage medium and processor |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109027284A (en) * | 2018-10-22 | 2018-12-18 | 哈尔滨工程大学 | A kind of flow Linear regulating valve controlled using import incoming flow parameter by PLC |
CN109027284B (en) * | 2018-10-22 | 2020-02-14 | 哈尔滨工程大学 | Flow linear regulating valve controlled by PLC (programmable logic controller) by utilizing inlet incoming flow parameters |
CN110261105A (en) * | 2019-08-13 | 2019-09-20 | 潍柴动力股份有限公司 | A kind of scaling method and device of electric control clutch |
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WO2023024510A1 (en) * | 2021-08-23 | 2023-03-02 | 维谛技术有限公司 | Control method and apparatus for opening degree of valve, and non-volatile storage medium and processor |
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Application publication date: 20180119 |