CN108869835A - The open and close control method and switching control system of gauge table step motor control valve - Google Patents
The open and close control method and switching control system of gauge table step motor control valve Download PDFInfo
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- CN108869835A CN108869835A CN201810595274.8A CN201810595274A CN108869835A CN 108869835 A CN108869835 A CN 108869835A CN 201810595274 A CN201810595274 A CN 201810595274A CN 108869835 A CN108869835 A CN 108869835A
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- Prior art keywords
- valve
- stepper motor
- revolving speed
- closing
- step number
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
Abstract
The invention discloses the open and close control method of gauge table step motor control valve and switching control systems, belong to gauge table technical field, solve existing gauge table step motor control valve open and close control it is unstable caused by valve gas leakage, deformation the problems such as, the open and close control method of gauge table step motor control valve of the present invention, includes the following steps：Start the switching programme that the stepper motor executes the valve；The operation step number of the stepper motor and the locked rotor current of the stepper motor are detected in the switching programme；Valve opening and closing is carried out according to the testing result of the testing result of stepper motor operation step number and the locked rotor current to judge in place：If the two is all satisfied the preset condition of valve opening and closing in place, valve opening and closing is determined in place, switching programme terminates；If valve opening and closing preset condition in place is not satisfied in the two or alternative one is unsatisfactory for the preset condition of valve opening and closing in place, determines that valve is not opened and closed in place, continue to execute the switching programme.
Description
【Technical field】
The present invention relates to the open and close control method of gauge table technical field more particularly to gauge table step motor control valve and
Switching control system.
【Background technique】
With the continuous development of gas metering technology, industrial combustion gas measurement technology is also increasingly reformed.Industrial combustion gas table is with valve
The installation form of door can be divided into external valve and built-in valve, valve built in stepper motor as valve built in the one kind risen recently,
Have the advantages that staring torque is big, stroke control it is accurate, so that motor exports high-torque when effectively reducing or even avoid stall
The influence that drive mechanism is generated.But since the structure and size of valve have a certain difference, lead to the valve of same model i.e.
It has differences the switch distance in the case where same program controls also can, so that in industrial combustion gas table practical application, can generate
Part valve switch is not in place, there is the danger that gas leakage occurs or valve continues on afterwards in place, valve is caused to deform
Situation.
Be disclosed on the basis of above-mentioned control mode in the prior art increase valve in place detection technique to improve above-mentioned feelings
The technical solution of condition, this technical solution have preferable effect under routinely using operating condition, but when the application of industrial combustion gas table is existing
There are when electrostatic, due to electrostatic interference, it may occur that the case where valve does not detect locked rotor current again in place, at this moment valve will
Stop advancing, can equally generate the above problem, if filtering out the functional module of electrostatic for the increase of electrostatic interference problem, valve at
This can also increase accordingly.In consideration of it, it is necessary to improve current valve opening and closing control technology, so that valve opening and closing control is more steady
It is fixed reliable.
【Summary of the invention】
A kind of gauge table stepping electricity is provided technical problem to be solved by the present invention lies in overcome the deficiencies in the prior art
The open and close control method of machine control valve accurately controls stepper motor in such a way that step number control and locked rotor current detection combine
The on-off action of control valve keeps valve control more reliable and more stable.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
The open and close control method of gauge table step motor control valve, the step motor control valve include valve and for driving
The stepper motor of the valve opening and closing is moved, the open and close control method includes the following steps：
Start the switching programme that the stepper motor executes the valve；
The operation step number of the stepper motor and the locked rotor current of the stepper motor are detected in the switching programme；
Valve is carried out according to the testing result of the testing result of stepper motor operation step number and the locked rotor current to open
It closes and judges in place：If the two is all satisfied the preset condition of valve opening and closing in place, valve opening and closing is determined in place, the switching programme
Terminate；If the two is not satisfied valve opening and closing preset condition in place or alternative one is unsatisfactory for valve opening and closing in place pre-
If condition, then determines that valve is not opened and closed in place, continue to execute the switching programme.
In the open and close control method of above-mentioned gauge table step motor control valve, the valve opening and closing program includes on revolving speed
The stage of liter, revolving speed are kept for stage and revolving speed decline stage, and the revolving speed ascent stage controls the stepper motor Accelerating running, institute
Stating revolving speed keeps stepper motor described in stage control to travel at the uniform speed, and the revolving speed decline stage controls the stepper motor deceleration fortune
Row.
In the open and close control method of above-mentioned gauge table step motor control valve, the revolving speed ascent stage includes adding paragraph by paragraph
Multiple accelerating sections of speed, the stepper motor are equipped with corresponding default step number a in each accelerating sections, then complete n-th of accelerating sections
When cumulative step number aAdd=a1+a2+a3+……an, judge cumulative step number aAddWhether the revolving speed ascent stage default total is reached
Step number aAlwaysIf aAdd≥aAlways, then enter revolving speed and kept for the stage, if aAdd< aAlways, then enter (n+1)th accelerating sections.
In the open and close control method of above-mentioned gauge table step motor control valve, in the revolving speed holding stage, institute is judged
State stepper motor real time execution step number bIt is realWhether default total step number b that the revolving speed kept for stage is reachedAlwaysIf bIt is real≥bAlways, then
Into the revolving speed decline stage, if bIt is real< bAlways, then maintain the revolving speed and kept for the stage.
In the open and close control method of above-mentioned gauge table step motor control valve, the revolving speed decline stage includes subtracting paragraph by paragraph
Multiple braking sections of speed, the stepper motor are equipped with corresponding default step number c in each braking section, then complete n-th of braking section
When cumulative step number cAdd=c1+c2+c3+……cn, judge cumulative step number cAddWhether the revolving speed decline stage default total is reached
Step number cAlwaysIf cAdd≥cAlways, then the revolving speed decline stage terminates, if cAdd< cAlways, then enter (n+1)th braking section.
In the open and close control method of above-mentioned gauge table step motor control valve, the detection of the stepper motor operation step number
As a result meeting the preset condition of valve opening and closing in place is：Nmin≤NAlways≤Nmax, wherein NAlwaysIt is walked for the operation of the stepper motor
Number, NminFor the step threshold range lower limit of the switching programme, NmaxFor the step threshold range limit of the switching programme.
In the open and close control method of above-mentioned gauge table step motor control valve, the testing result of the locked rotor current meets
The preset condition of valve opening and closing in place is：IIt is stifled> IThreshold, and IIt is stifledVariable quantity in setting time T tends to 0, wherein IIt is stifledFor institute
State the locked rotor current of locked rotor current detection acquisition, IThresholdFor the current threshold of locked rotor current detection.
The invention also provides the switching control system of gauge table step motor control valve, the step motor control valve packet
Valve and the stepper motor for driving the valve opening and closing are included, the switching control system includes control unit, power supply unit
With valve driving unit, described control unit controls said supply unit for valve driving unit power supply, by described
Valve driving unit controls the operation of the stepper motor, described control unit stepping according to the pulse signal detection of output
The operation step number of motor, described control unit stepping according to the locked rotor current signal detection that the valve driving unit is fed back
The locked rotor current of motor.
In the switching control system of above-mentioned gauge table step motor control valve, said supply unit includes defeated for powering
Enter the power-supplying circuit of control and the power-switching circuit for voltage conversion, the input terminal difference of the power-supplying circuit
Power supply and described control unit are connected, the power-switching circuit is connected to the output end and the valve of the power-supplying circuit
Between door driving unit.
In the switching control system of above-mentioned gauge table step motor control valve, described control unit includes single-chip microcontroller and RC
Filter circuit, to the valve driving unit output pulse signal, the locked rotor current signal passes through the I/O mouth of the single-chip microcontroller
The filtering processing of the RC filter circuit is fed back to the single-chip microcontroller.
Beneficial effects of the present invention：
The open and close control method of gauge table step motor control valve of the invention, the step motor control valve includes valve
With for driving the stepper motor of the valve opening and closing, the open and close control method includes the following steps：Start the stepping electricity
Machine executes the switching programme of the valve；The operation step number and the step of the stepper motor are detected in the switching programme
Into the locked rotor current of motor；According to the stepper motor run step number testing result and the locked rotor current testing result into
Row valve opening and closing judges in place：The two is all satisfied the preset condition of valve opening and closing in place, then determines valve opening and closing in place, described to open
Close EP (end of program)；If valve opening and closing preset condition in place is not satisfied in the two or alternative one is unsatisfactory for valve opening and closing and arrives
The preset condition of position, then determine that valve is not opened and closed in place, continue to execute the switching programme.
Open and close control method of the invention detects the side combined using stepper motor operation step number detection and locked rotor current
Formula carries out valve opening and closing and judges in place, and the only testing result of stepper motor operation step number and the testing result of locked rotor current is full
The preset condition of sufficient valve opening and closing in place just determines valve opening and closing in place, wherein：Detection to stepper motor locked rotor current, can
To solve the problems, such as to lead to opening and closing judgement inaccuracy in step number control due to different valve othernesses；Stepper motor is run and is walked
Several detections, can to avoid valve opening and closing not in place in the case of so that valve is stopped the feelings advancing due to detecting locked rotor current
Condition can make up mutual detection defect in such a way that stepper motor operation step number detection and locked rotor current detection combine,
It solves electrostatic interference, reduces protection cost, so as to accurately control the on-off action of step motor control valve, make valve
Control is more reliable and more stable, can reliably realize the valve opening and valve closing of valve in conventional operating condition and industrial application scene, enhance
Adaptability of the gauge table to environment.
Further, the valve opening and closing program includes that revolving speed ascent stage, revolving speed are kept for stage and revolving speed decline stage,
The revolving speed ascent stage controls the stepper motor Accelerating running, and the revolving speed keeps stepper motor described in stage control at the uniform velocity
Operation, the revolving speed decline stage control the stepper motor and run slowly.Wherein, stepping electricity is controlled in revolving speed ascent stage
Machine Accelerating running makes stepper motor initially provide biggish torque in valve operation, to guarantee that valve can start success；Turning
It controls stepper motor in the fast holding stage to travel at the uniform speed, it is possible to reduce valve runing time reduces power consumption；In the revolving speed decline stage
Middle control stepper motor runs slowly, and stepper motor is made to provide biggish torque when valve closes in place, to guarantee that valve is opened
Closure when closing in place；Kept for the stage turn with stepper motor difference in the revolving speed decline stage by revolving speed ascent stage, revolving speed
The design control stepper motor of speed exports different torques, can effectively prevent valve because stuck problem occurs in foreign matter, reduces
Maintenance cost, the opening/closing time that also can be shortened valve for extending service life, and designing in this way, more practicability.
Further, the revolving speed ascent stage includes the multiple accelerating sections accelerated paragraph by paragraph, and the stepper motor is each
Accelerating sections is equipped with corresponding default step number a, then completes cumulative step number a when n-th of accelerating sectionsAdd=a1+a2+a3+……an, sentence
Disconnected cumulative step number aAddWhether the default total step number a of the revolving speed ascent stage is reachedAlwaysIf aAdd≥aAlways, then enter revolving speed and keep
Stage, if aAdd< aAlways, then enter (n+1)th accelerating sections.Revolving speed ascent stage uses staged accelerated mode, so that stepping is electric
Machine revolving speed is gradually incremented by according to setting scheme, and locked rotor current is effectively prevent to be mutated, and plays to the stability of control system certain
Protective effect.
Further, the revolving speed decline stage includes the multiple braking sections to slow down paragraph by paragraph, and the stepper motor is each
Braking section is equipped with corresponding default step number c, then completes cumulative step number c when n-th of braking sectionAdd=c1+c2+c3+……cn, sentence
Disconnected cumulative step number cAddWhether the default total step number c of the revolving speed decline stage is reachedAlwaysIf cAdd≥cAlways, then the revolving speed decline
Stage terminates, if cAdd< cAlways, then enter (n+1)th braking section.The revolving speed decline stage uses staged ways of deceleration, so that step
Gradually successively decrease into motor speed according to setting scheme, locked rotor current is effectively prevent to be mutated, one is played to the stability of control system
Fixed protective effect.
Further, the testing result that the stepper motor runs step number meets the preset condition of valve opening and closing in place and is：
Nmin≤NAlways≤Nmax, wherein NAlwaysFor the operation step number of the stepper motor, NminFor the step threshold range of the switching programme
Lower limit, NmaxFor the step threshold range limit of the switching programme.The condition in place of stepper motor operation step number is set as area
Between range, this allow for step number control have certain error tolerance, reduce to stepper motor steps control required precision, control
The practicability of method processed is more preferable.
Further, the testing result of the locked rotor current meets the preset condition of valve opening and closing in place and is：IIt is stifled> IThreshold, and
And IIt is stifledVariable quantity in setting time T tends to 0, wherein IIt is stifledFor the locked rotor current of locked rotor current detection acquisition, IThresholdFor institute
State the current threshold of locked rotor current detection.Such preset condition is set for locked rotor current detection, it can be with effective district sub-valve
When starting and valve in place when locked rotor current, improve locked rotor current detection accuracy rate, prevent locked rotor current erroneous detection and influence
The reliability that valve opening and closing judges in place.
In the switching control system of gauge table step motor control valve, described control unit includes single-chip microcontroller and RC filtering
Circuit, the I/O mouth of the single-chip microcontroller is to the valve driving unit output pulse signal, described in the locked rotor current signal passes through
The filtering processing of RC filter circuit is fed back to the single-chip microcontroller.Single-chip microcontroller only needs the positive and negative of 1 I/O mouthfuls i.e. controllable stepper motors
Turn, rotate angle and revolving speed, saves I/O mouthfuls of use；RC filter circuit is set, the filtering effect to interference signal can be enhanced
Fruit improves the accuracy of locked rotor current detection, and then guarantees the reliability that valve opening and closing judges in place.
These features and advantages of the invention will the detailed exposure in following specific embodiment, attached drawing.
【Detailed description of the invention】
Following further describes the present invention with reference to the drawings：
Fig. 1 is the switching control system functional block diagram of gauge table step motor control valve in the embodiment of the present invention；
Fig. 2 is the open and close control method flow diagram of gauge table step motor control valve in the embodiment of the present invention.
Appended drawing reference：
100 single-chip microcontrollers；
200 power supply units, 210 power-supplying circuits, 220 power-switching circuits；
300 valve driving units；
400 stepper motors.
【Specific embodiment】
The technical solution of the embodiment of the present invention is explained and illustrated below with reference to the attached drawing of the embodiment of the present invention, but under
It states embodiment to be merely a preferred embodiment of the present invention, and not all.Based on the implementation example in the implementation mode, those skilled in the art
Obtained other embodiments without making creative work, belong to protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " clockwise ", " inverse
The orientation or positional relationship of the instructions such as hour hands " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two
It is a or more than two, unless otherwise restricted clearly.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Referring to Fig.1, a kind of switching control system of gauge table step motor control valve is proposed in the embodiment of the present invention,
In：Step motor control valve includes valve and the stepper motor 400 for driving valve opening and closing；Switching control system includes control
Unit, power supply unit 200 and valve driving unit 300, control unit control power supply unit 200 as the confession of valve driving unit 300
Electricity, to control the operation of stepper motor 400 by valve driving unit 300, control unit is according to the pulse signal detection of output
The operation step number of stepper motor 400, the locked rotor current signal detection stepping electricity that control unit is fed back according to valve driving unit 300
The locked rotor current of machine 400.
According to the switching control system of the present embodiment, power supply unit 200 includes the power supply control for supply input control
Circuit 210 and for voltage conversion power-switching circuit 220, the input terminal of power-supplying circuit 210 be separately connected power supply and
Control unit, power-switching circuit 220 are connected between the output end of power-supplying circuit 210 and valve driving unit 300.Electricity
Source is usually lithium battery, and control unit realizes input control of the lithium battery to power-supplying circuit 210, power-switching circuit 220
For the primary voltage part lowering and stabilizing blood pressure processing to input, output meets the driving voltage of valve driving unit 300.The present embodiment
Control unit includes single-chip microcontroller 100, and the I/O mouth of single-chip microcontroller 100 is to 300 output pulse signal of valve driving unit, stepper motor
Revolving speed control be to determine that the number of steps of stepper motor is pulse number, the present embodiment come what is realized by adjusting pulse number
In, by the pulse frequency of the control output of single-chip microcontroller 100, and then the revolving speed and torque of stepper motor 400 are controlled, reduced to valve
Damage, and single-chip microcontroller 100 only needs positive and negative rotations, rotation angle and the revolving speed of 1 I/O mouthfuls i.e. controllable stepper motors 400,
Save I/O mouthfuls of use.
According to above-mentioned switching control system, single-chip microcontroller 100 is according to the fortune of the pulse signal detection stepper motor 400 of output
Row step number, the stall for the locked rotor current signal detection stepper motor 400 that single-chip microcontroller 100 is fed back also according to valve driving unit 300
Further RC filter circuit is arranged in electric current in switching control system, and locked rotor current signal passes through the filtering of RC filter circuit
Processing feedback arrives single-chip microcontroller, and the filter effect to interference signal can be enhanced in RC filter circuit, improves the standard of locked rotor current detection
True property, and then guarantee the reliability that valve opening and closing judges in place.
Referring to Fig. 2, according to the switching control system of the present embodiment, open and close control method includes the following steps：
Start the switching programme that stepper motor executes valve；
The operation step number of stepper motor and the locked rotor current of stepper motor are detected in switching programme；
Valve is carried out according to the testing result of the testing result of stepper motor operation step number and the locked rotor current to open
It closes and judges in place：If the two is all satisfied the preset condition of valve opening and closing in place, valve opening and closing is determined in place, switching programme knot
Beam；If the two is not satisfied valve opening and closing preset condition in place or alternative one is unsatisfactory for valve opening and closing in place default
Condition then determines that valve is not opened and closed in place, continues to execute switching programme.Switching programme described here be suitable for valve valve opening and
Valve closing, therefore above-mentioned open and close control method had both been used for the valve opening control of valve, was also used for the valve closing control of valve.
According to the open and close control method of the present embodiment, above-mentioned valve opening and closing program includes revolving speed ascent stage, revolving speed guarantor
It holds stage and revolving speed decline stage, revolving speed ascent stage controls stepper motor Accelerating running, keeps stepper motor first in valve operation
Begin to provide biggish torque, to guarantee that valve can start success；Revolving speed keeps stage control stepper motor to travel at the uniform speed, can be with
Valve runing time is reduced, power consumption is reduced；Revolving speed decline stage control stepper motor runs slowly, and faces stepper motor in valve
Biggish torque is provided when closely in place, closure when guaranteeing valve opening and closing in place；It is kept by revolving speed ascent stage, revolving speed
The design control stepper motor of stepper motor different rotating speeds exports different torques in stage and revolving speed decline stage, can effectively prevent
Only valve because foreign matter there is stuck problem, reduce maintenance cost, extend service life, and design in this way can also
Shorten the opening/closing time of valve, more practicability.
Preferably：Revolving speed ascent stage includes the multiple accelerating sections accelerated paragraph by paragraph, and stepper motor is equipped in each accelerating sections
Corresponding default step number a then completes cumulative step number a when n-th of accelerating sectionsAdd=a1+a2+a3+……an, judge cumulative step number
aAddWhether the default total step number a of revolving speed ascent stage is reachedAlwaysIf aAdd≥aAlways, then enter revolving speed and kept for the stage, if aAdd<
aAlways, then enter (n+1)th accelerating sections.Specifically：Stepper motor revolving speed in single accelerating sections remains unchanged, but two neighboring
The stepper motor revolving speed of accelerating sections is in incremental variations；According to the operation characteristic of stepper motor, the starting of setting speed ascent stage
Revolving speed and final revolving speed, the default total step number a of available revolving speed ascent stageAlways,The stepper motor revolving speed of each accelerating sections
All set, correspondingly, stepper motor each accelerating sections be equipped with corresponding default step number a, this multiple accelerating sections it is pre-
If step number a is usually consistent, under conditions of and revolving speed consistent in default step number a is incremented by, the deadline of multiple accelerating sections is presented
Subtract variation, the runing time of revolving speed ascent stage can be saved in this way.Illustratively：The default total step number a of revolving speed ascent stageAlways
Default step number a for 1000 steps, accelerating sections is 100 steps, then revolving speed ascent stage needs according to above-mentioned staged accelerated mode
10 accelerating sections are completed, and enters revolving speed after completing the 10th accelerating sections and is kept for the stage.Such design can effectively prevent and turn
The locked rotor current of fast ascent stage is mutated, and is played a certain protective role to the stability of control system.
Preferably：In the revolving speed holding stage, remained a constant speed operation with the final revolving speed of above-mentioned revolving speed ascent stage, due to
The final revolving speed of revolving speed ascent stage is very fast, so that revolving speed keeps the locked rotor current in stage smaller, valve can be accelerated to transport in this way
It is dynamic, valve runing time is reduced, power consumption is reduced.In the revolving speed holding stage, stepper motor real time execution step number b is judgedIt is realWhether reach
The default total step number b in stage is kept to revolving speedAlwaysIf bIt is real≥bAlways, then enter the revolving speed decline stage, if bIt is real< bAlways, then
It maintains revolving speed and is kept for the stage.
Preferably：The revolving speed decline stage includes the multiple braking sections to slow down paragraph by paragraph, and stepper motor is equipped in each braking section
Corresponding default step number c then completes cumulative step number c when n-th of braking sectionAdd=c1+c2+c3+……cn, judge cumulative step number
cAddWhether the default total step number c of revolving speed decline stage is reachedAlwaysIf cAdd≥cAlways, then the revolving speed decline stage terminates, if cAdd<
cAlways, then enter (n+1)th braking section.Specifically：Stepper motor revolving speed in single braking section remains unchanged, but two neighboring
The stepper motor revolving speed of braking section tapers off variation；According to the operation characteristic of stepper motor, the starting of setting speed decline stage
Revolving speed (namely the motor speed in revolving speed holding stage) and final revolving speed, the default total step number of available revolving speed decline stage
cAlways, the stepper motor revolving speed of each braking section is also set, correspondingly, stepper motor is equipped with correspondence in each braking section
Default step number c, the default step number c of this multiple braking section is usually consistent, the condition that and revolving speed consistent in default step number a successively decreases
Under, deadlines of multiple braking sections is in incremental variations, in this way close on valve in place state can provide it is larger and stable
Torque ensures the closure of valve.Illustratively：The default total step number c of revolving speed decline stageAlwaysFor 500 steps, braking section it is pre-
If step number a is 100 steps, then according to above-mentioned staged ways of deceleration, the revolving speed decline stage needs to complete 5 braking sections, and
After completing the 5th braking section, the revolving speed decline stage terminates.Such design can effectively prevent the stall electricity of revolving speed decline stage
Stream mutation, plays a certain protective role the stability of control system.
Kept for stage and revolving speed decline stage according to above-mentioned revolving speed ascent stage, revolving speed：Stepper motor is in opening and closing journey
Operation step number N in sequenceAlways=aAdd+bIt is real+cAdd, in the present embodiment, the testing result of stepper motor operation step number meets valve opening and closing
Preset condition in place is：Nmin≤NAlways≤Nmax, NminFor the step threshold range lower limit of switching programme, NmaxFor switching programme
The condition in place of stepper motor operation step number is set as interval range, as long as stepper motor is being opened by step threshold range limit
Close the operation step number N in programAlwaysIn Nmin~NmaxIn the range of restriction, decide that the testing result of stepper motor operation step number is full
The preset condition of sufficient valve opening and closing in place, this allows for step number control to have certain error tolerance, reduces and walk to stepper motor
The required precision of number control, the practicability of control method are more preferable.
In the embodiment of the present invention, the testing result of locked rotor current meets the preset condition of valve opening and closing in place and is：IIt is stifled> IThreshold,
And IIt is stifledVariable quantity in setting time T tends to 0, wherein the locked rotor current that I blocks up as locked rotor current detection acquisition, I threshold is stifled
Turn the current threshold of current detecting.According to switching control system above-mentioned：Single-chip microcontroller is fed back according to valve driving unit
The locked rotor current of locked rotor current signal detection stepper motor is actually by conversion circuit by stall to the detection of locked rotor current
Electric current is converted to locked-rotor voltage, and single-chip microcontroller acquires locked-rotor voltage value in real time, locked-rotor voltage with the variation of stepper motor revolving speed and
Opposite variation tendency is presented, i.e. stepper motor revolving speed rises, locked-rotor voltage decline；The decline of stepper motor revolving speed, then stall is electric
Pressure rises, and is compared in single-chip microcontroller according to current collected locked-rotor voltage value and the collected locked-rotor voltage value of preceding n times, because
The testing result of this above-mentioned locked rotor current meets the preset condition of valve opening and closing in place：IIt is stifled> IThreshold, and IIt is stifledIn setting time T
Variable quantity tend to 0, it is understood that be：UIt is stifled> UThreshold, and UIt is stifledVariable quantity in setting time T tends to 0, although valve opens
Locked rotor current when dynamic is larger, but with stepper motor faster rotational speed, locked rotor current can be gradually reduced, therefore, above-mentioned default item
Situation described in part only appears in later period revolving speed decline stage, sets such preset condition for locked rotor current detection, can be with
When effective district sub-valve starts and valve in place when locked rotor current, improve the accuracy rate of locked rotor current detection, prevent stall electric
It flows erroneous detection and influences the reliability that valve opening and closing judges in place.
To sum up, the testing result that stepper motor runs step number meets the preset condition of valve opening and closing in place and is：Nmin≤NAlways≤
Nmax；The testing result of locked rotor current meets the preset condition of valve opening and closing in place：IIt is stifled> IThreshold, and IIt is stifledIn setting time T
Variable quantity tend to 0, then, open and close control method according to an embodiment of the present invention, if Nmin≤NAlways≤Nmax, and IIt is stifled>
IThreshold, IIt is stifledVariable quantity in setting time T tends to 0, i.e., the two is all satisfied respective preset condition, then determines that valve opening and closing arrives
Position, switching programme terminate；If valve opening and closing preset condition in place is not satisfied in the two or alternative one is unsatisfactory for valve
Opening and closing preset condition in place, then determine that valve is not opened and closed in place, continue to execute switching programme, until both be all satisfied it is respective
Preset condition.After switching programme, switching control system can enter low-power consumption mode, to reduce energy consumption.
In the open and close control method that the embodiment of the present invention is proposed, detection to stepper motor locked rotor current be can solve
Lead to the problem of opening and closing judgement inaccuracy in step number control due to different valve othernesses；And for stepper motor operation step number
Detection, can to avoid valve opening and closing not in place in the case of make valve stop the case where advancing, adopting due to detecting locked rotor current
Mutual detection defect can be made up with the mode that stepper motor operation step number detection and locked rotor current detection combine, is solved
Electrostatic interference reduces protection cost, so as to accurately control the on-off action of step motor control valve, makes valve control more
Add reliable and stable, can reliably realize the valve opening and valve closing of valve in conventional operating condition and industrial application scene, enhance gauge table
To the adaptability of environment.
Embodiment of the present invention is mainly used in gas meter, flow meter, can also apply in other fluid meters such as water meter.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to attached drawing and interior described in specific embodiment above
Hold.Any modification without departing from function and structure principle of the invention is intended to be included in the range of claims.
Claims (10)
1. the open and close control method of gauge table step motor control valve, the step motor control valve includes valve and for driving
The stepper motor of the valve opening and closing, which is characterized in that the open and close control method includes the following steps：
Start the switching programme that the stepper motor executes the valve；
The operation step number of the stepper motor and the locked rotor current of the stepper motor are detected in the switching programme；According to
The testing result of the stepper motor operation step number and the testing result of the locked rotor current carry out valve opening and closing and judge in place：If
The two is all satisfied the preset condition of valve opening and closing in place, then determines valve opening and closing in place, and the switching programme terminates；If the two is equal
It is unsatisfactory for valve opening and closing preset condition in place or alternative one is unsatisfactory for the preset condition of valve opening and closing in place, then determine
Valve is not opened and closed in place, continues to execute the switching programme.
2. the open and close control method of gauge table step motor control valve as described in claim 1, which is characterized in that the valve is opened
Closing program includes that revolving speed ascent stage, revolving speed holding stage and revolving speed decline stage, the revolving speed ascent stage control the step
Into motor Accelerating running, the revolving speed keeps stepper motor described in stage control to travel at the uniform speed, the revolving speed decline stage control
The stepper motor runs slowly.
3. the open and close control method of gauge table step motor control valve as claimed in claim 2, which is characterized in that on the revolving speed
The stage of liter includes the multiple accelerating sections accelerated paragraph by paragraph, and the stepper motor is equipped with corresponding default step number a in each accelerating sections, then
Complete cumulative step number a when n-th of accelerating sectionsAdd=a1+a2+a3+……an, judge cumulative step number aAddWhether the revolving speed is reached
The default total step number a of ascent stageAlwaysIf aAdd≥aAlways, then enter revolving speed and kept for the stage, if aAdd< aAlways, then enter (n+1)th
Accelerating sections.
4. the open and close control method of gauge table step motor control valve as claimed in claim 2, which is characterized in that the revolving speed is protected
It holds in the stage, judges the stepper motor real time execution step number bIt is realWhether default total step number that the revolving speed kept for stage is reached
bAlwaysIf bIt is real≥bAlways, then enter the revolving speed decline stage, if bIt is real< bAlways, then maintain the revolving speed and kept for the stage.
5. the open and close control method of gauge table step motor control valve as claimed in claim 2, which is characterized in that under the revolving speed
Depression of order section includes the multiple braking sections to slow down paragraph by paragraph, and the stepper motor is equipped with corresponding default step number c in each braking section, then
Complete cumulative step number c when n-th of braking sectionAdd=c1+c2+c3+……cn, judge cumulative step number cAddWhether the revolving speed is reached
The default total step number c of decline stageAlwaysIf cAdd≥cAlways, then the revolving speed decline stage terminates, if cAdd< cAlways, then enter n-th
+ 1 braking section.
6. the open and close control method of gauge table step motor control valve as described in one of claim 1 to 5, which is characterized in that institute
The testing result for stating stepper motor operation step number meets the preset condition of valve opening and closing in place and is：Nmin≤NAlways≤Nmax, wherein NAlways
For the operation step number of the stepper motor, NminFor the step threshold range lower limit of the switching programme, NmaxFor the opening and closing journey
The step threshold range limit of sequence.
7. the open and close control method of gauge table step motor control valve as described in one of claim 1 to 5, which is characterized in that institute
The testing result for stating locked rotor current meets the preset condition of valve opening and closing in place and is：IIt is stifled> IThreshold, and IIt is stifledIn setting time T
Variable quantity tends to 0, wherein IIt is stifledFor the locked rotor current of locked rotor current detection acquisition, IThresholdFor the electricity of locked rotor current detection
Flow threshold value.
8. the switching control system of gauge table step motor control valve, the step motor control valve includes valve and for driving
The stepper motor of the valve opening and closing, which is characterized in that the switching control system includes control unit, power supply unit and valve
Driving unit, described control unit control said supply unit for valve driving unit power supply, to drive by the valve
Moving cell controls the operation of the stepper motor, described control unit stepper motor according to the pulse signal detection of output
Step number is run, described control unit stepper motor according to the locked rotor current signal detection that the valve driving unit is fed back
Locked rotor current.
9. the switching control system of gauge table step motor control valve as claimed in claim 8, which is characterized in that the power supply is single
Member includes the power-supplying circuit for supply input control and the power-switching circuit for voltage conversion, the power supply control
The input terminal of circuit is separately connected power supply and described control unit, and the power-switching circuit is connected to the power-supplying circuit
Output end and the valve driving unit between.
10. the switching control system of gauge table step motor control valve as claimed in claim 8, which is characterized in that the control
Unit includes single-chip microcontroller and RC filter circuit, and the I/O mouth of the single-chip microcontroller is to the valve driving unit output pulse signal, institute
Locked rotor current signal is stated to feed back by the filtering processing of the RC filter circuit to the single-chip microcontroller.
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| CN201810595274.8A CN108869835B (en) | 2018-06-11 | 2018-06-11 | Open-close control method and open-close control system for meter stepping motor control valve |
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