CN107765716A - A kind of double loop control of flow control valve - Google Patents
A kind of double loop control of flow control valve Download PDFInfo
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- CN107765716A CN107765716A CN201610681144.7A CN201610681144A CN107765716A CN 107765716 A CN107765716 A CN 107765716A CN 201610681144 A CN201610681144 A CN 201610681144A CN 107765716 A CN107765716 A CN 107765716A
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- flow
- control valve
- aperture
- flow control
- setting
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
Abstract
The present invention relates to a kind of double loop control of flow control valve, comprising：Slope processing is carried out to setting flow and the initial setting aperture of valve is obtained by flow control valve working curve, setting response compensation, the final aperture of flow control valve is obtained, opens flow control valve；Measure the actual flow of flow control valve and actual aperture；Actual flow is fed back and flow ring processing is carried out to it, obtains flow-compensated, while actual aperture is fed back and aperture ring processing is carried out to it, obtain aperture compensation；By initially setting aperture, response compensates, the compensation of flow-compensated and aperture controls together, obtain the final aperture of flow control valve renewal, the aperture of flow control valve is controlled with the final aperture of the renewal, the actual flow updated and actual aperture, and repeat the above steps, until flow control valve power cut-off.The present invention improves the response speed and precision of flow control valve, is advantageous to the actual cooling effect to steel plate, improves plate quality.
Description
Technical field
The present invention relates to flow control valve automated control technology, refers in particular to a kind of double -loop control side of flow control valve
Method.
Background technology
At present, ACC (laminar flow quickly cools down) technology is widely used to shipbuilding, pipeline, building, bridge, pressure vessel etc.
The production of steel plate.Using section cooling, the cooling device of part producing factory also has Fast Cooling ability, can be to rolling rear steel plate
Carry out direct quenching (DQ).Compared with being quenched after traditional heat treatment, direct quenching can not only save, and in cooling velocity
Higher hardenability can be obtained under the premise of identical, carbon content and carbon equivalent in steel can be reduced, so as to improve steel plate
Welding performance, therefore most of advanced accelerated cooling devices all have direct quenching ability, example, Baosteel Heavy Plate Mill's production work
Skill is made up of laminar flow and direct quenching (DQ) two parts.
With increasingly raising of the user to finished steel plate quality and performance requirement, to the response accuracy of ACC flow control valves
Be proposed higher requirement with flow accuracy, therefore, to the structure of existing slab portion cooling zone flow control valve equipment and
Speech can not meet the needs of this new.
Existing ACC flow control valves only feed back with " actual flow ", can not detect " actual aperture " information, can draw
The problem of playing the control of uninterrupted and responding not in time, goes out the uncontrollable phenomenon of present condition, so as to cause steel plate total length uniform
Property the problem of, eventually result in steel plate produce capability and performance defect, reduce steel plate service rating.
The control method of existing ACC flow control valves Flow-rate adjustment is as shown in figure 1, comprise the steps of：
S11, setting flow control valve flow (flow of cooling water), and handled by slope, dashed forward with reducing setting flow
The influence stable to system during change, the slope processing refer to setting flow from A change to B when (example 0-800l/m2* min),
In order to avoid being mutated the slope function added to the influence of system, adjust each scan period numerical value change amount and (refer specifically to pair
During B is changed to from A, the variable quantity of each cycle, for example 500 change to 800, each cycle variable quantity is 100, then needs 3
The individual program execution cycle can just change to 800, when changing to 800, it is believed that this oblique wave has been handled in place.In addition, oblique wave function
Each period change amount can be adjusted in parameter)；
S12, the setting flow after slope is handled, by " working curve " (characteristic curve of flow control valve in itself, i.e.,
Corresponding flow curve during each aperture that flow control valve is demarcated in itself) obtain setting aperture corresponding to flow control valve
Value, and control flow control valve to open；
S13, after flow control valve is opened, measure the actual flow of flow control valve；
S14, actual flow is fed back, turn into feedback flow；
S15, the delay X seconds, (X took the 2-5 seconds to setting flow in step s 11, is adjusted according to flow after slope is handled in place
Save valve real response situation and determine value), deviation of the measurement setting flow with feeding back flow；
S16, according to setting flow and the deviation for feeding back flow, calculated in real time by pi regulator (proportional and integral controller)
Obtain the flow-compensated of flow control valve；
S17, measurement setting flow and flow-compensated sum, obtain real-time traffic；
S18, real-time traffic obtain real-time opening value corresponding to flow control valve, real-time controlling stream by " working curve " again
Adjustable valve aperture, the flow control valve actual flow updated；
S19, repeat the above steps after the flow control valve actual flow updated S14-S18, until flow control valve
Power cut-off.
The shortcomings that above-mentioned control method：
1st, flow control valve aperture is controlled only by " working curve " in flow control valve opening procedure, makes Flow-rate adjustment
The response speed of valve opening procedure is limited；
2nd, aperture is finally set, is obtained by " working curve " selection, and flow control valve working curve is according to reality
It the change of operating mode, can fluctuate, the practical effect of flow control valve is also fluctuated therewith.
3rd, only used " actual flow " to feed back, do not fed back using " actual aperture ", do not utilize flow maximumlly
The characteristics of regulating valve.
At present, has there is flow control valve new product in market, is both fed back with " the actual aperture of flow control valve ", Neng Goutong
When monitor " actual flow " and " actual aperture " information.In order to preferably utilize this advantage of new product flow control valve, if
New shaping modes are counted, coordinate the use of new flow control valve, to improve the response accuracy of ACC flow control valves and flow accuracy
Turn into the task of top priority in the industry.
The content of the invention
The problem of the invention aims to overcome prior art to exist, new product flow control valve is made full use of to possess
The characteristics of " aperture and flow feedback ", there is provided " opening adjuster " and " flow regulator " model, while " flow control valve is provided
Opening procedure response compensation " model, realizes and accelerates flow control valve response speed, improve flow control valve steady state flow precision
A kind of double loop control of flow control valve.
The purpose of the present invention is achieved through the following technical solutions：
A kind of double loop control of flow control valve, is comprised the following steps：
S1, the cooling water flow of flow control valve is set, slope processing is carried out to setting flow；
S2, setting working curve of the flow by flow control valve after slope is handled, obtains the first of flow control valve
Begin setting aperture, meanwhile, setting response compensation；
S3, control the final aperture of flow control valve defeated together by the initial setting aperture and response compensation of flow control valve
Go out controller, obtain the final aperture of flow control valve, opened by the final aperture control flow control valve of the flow control valve；
S4, after flow control valve is opened, measure the actual flow of flow control valve and actual aperture；
S5, the actual flow of the flow control valve measured is fed back, turn into feedback flow, feedback flow is carried out
The processing of flow ring, obtains the flow-compensated of flow control valve；
S6, while step S5 is carried out, the actual aperture of the flow control valve measured by step S4 is fed back,
As feedback aperture, aperture ring processing is carried out to feedback aperture, obtains the aperture compensation of flow control valve；
S7, by the initial setting aperture of flow control valve, response compensation, the compensation of flow-compensated and aperture, control is final together
Aperture o controller, the final aperture updated, the aperture of flow control valve is controlled with the final aperture of the renewal, is obtained
The actual flow of the flow control valve of renewal and actual aperture；
After S8, the actual flow of the flow control valve updated and actual aperture, repeat the above steps S5-S7, until
Flow control valve power cut-off.
It is described response compensation set formula as：
Response compensation=(setting changes in flow rate amount × G) %, compensates amplitude limit 0~1%；
Wherein, the setting changes in flow rate amount refers to the changing value of front and rear cycle set flow；The G is in response to compensate mould
The coefficient of type, when setting changes in flow rate, G=0.004, postpone the X seconds after slope is handled when setting flow, G=0；The benefit
Repay the clipping range that amplitude limit is in response to compensation model output.
Flow ring processing in the step S5 includes：
S51, setting flow in step sl postpone the X seconds after slope is handled in place, measurement setting flow with it is described anti-
Present the deviation of flow；
S52, according to setting flow and the deviation for feeding back flow, flow control valve is calculated by pi regulator in real time
It is flow-compensated.
Aperture ring processing in the step S6 includes：
S61, setting flow in step sl postpone the X seconds after slope is handled in place, measures by being obtained in step S3
The deviation of the final aperture of flow control valve and the feedback aperture；
S62, according to the deviation of final aperture and feedback aperture, flow control valve is calculated by PC adjusters in real time
Aperture compensates.
The X seconds are the 2-5 seconds.
The X seconds are the 2-5 seconds.
Beneficial effects of the present invention：
The present invention flow control valve double loop control meet production technology and ensure equipment safety under conditions of,
Devise a kind of can be compensated simultaneously by aperture deviation compensation and flow deviation and control is adjusted to the flow of flow control valve
Method, the characteristics of making full use of new flow control valve product, improve the response speed and precision of flow control valve, be advantageous to
To the actual cooling effect of steel plate, plate quality is improved.
The method of the present invention has advantages below with prior art part：
1st, the initial opening procedure of flow control valve, by " working curve " and the output control of " response compensates ", can use up can
The response speed of flow control valve opening procedure can be improved；
2nd, " working curve ", which only defines, initially sets aperture, in the actual flow regulating valve course of work, respectively by PI and PC
Adjuster adjusts actual flow deviation and aperture deviation in real time, makes the overall control effect of flow control valve more stable；
3 at the same used " actual flow " and " actual aperture " feed back, maximumlly utilize the spy of new flow control valve
Point.
To further illustrate above-mentioned purpose, design feature and the effect of the present invention, the present invention is entered below with reference to accompanying drawing
Row describes in detail.
Brief description of the drawings
Fig. 1 is the control method schematic diagram of existing flow control valve；
Fig. 2 is the double loop control schematic diagram of inventive flow regulating valve；
Fig. 3 is the double loop control flow chart of inventive flow regulating valve.
Embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing of embodiment.
" double -loop control " of the present invention refers to enter aperture of the flow control valve in opening procedure together with flow
The method of row control.The double loop control of the flow control valve of the present invention is shown in Figure 2, comprises the following steps：
S1, the cooling water flow of flow control valve is set, slope processing is carried out to setting flow；
S2, setting working curve of the flow by flow control valve after slope is handled, obtains the first of flow control valve
Begin setting aperture, meanwhile, setting response compensation, response compensation is to be used to improve response speed in flow control valve opening procedure
A kind of compensation function；
The setting formula of the response compensation：Response compensation=(setting changes in flow rate amount × G) %, compensation amplitude limit 0~
1%；
The setting changes in flow rate amount refers to the changing value of front and rear cycle set flow, and (example, flow set is from 200l/m2*
Min changes to 400l/m2* min, that is, changes in flow rate amount is set as 200l/m2*min；
The G is in response to the coefficient of compensation model, when setting changes in flow rate, G=0.004, when setting flow is through slope
Postpone X seconds (X takes the 2-5 seconds), G=0 after processing；
Amplitude limit is compensated, refers to responding the clipping range of compensation model output, 0~1% finger is exactly to compensate amplitude limit, i.e.
The response compensation output upper limit is 1%, and lower limit 0%, compensation amplitude limit is to carry out amplitude limit to response compensation formula, i.e. response compensation
The number minimax that formula calculates will be in clipping range, example, amplitude limit 0%-1%, and formula has calculated 2%, but passes through
After amplitude limit, real response compensation output is only 1%, calculates 0.5%, then real response compensation output is also 0.5%；
By " response compensation ", when setting changes in flow rate, one aperture of Flow-rate adjustment valve compensation is given in advance so that flow
Regulating valve faster response in place, flow in place before, in order to avoid overshoot, response offset accordingly reduces so that Flow-rate adjustment
Valve events are more steady；
S3, control the final aperture of flow control valve defeated together by the initial setting aperture and response compensation of flow control valve
Go out controller T, obtain the final aperture of flow control valve, beaten by the final aperture control flow control valve of the flow control valve
Open；
S4, after flow control valve is opened, measure the actual flow of flow control valve and actual aperture；
S5, the actual flow of the flow control valve measured is fed back, turn into feedback flow, feedback flow is carried out
The processing of flow ring, obtains the flow-compensated of flow control valve, and the flow ring processing includes：
S51, setting flow in step sl postpone the X seconds (X takes the 2-5 seconds) after slope is handled in place, measurement setting stream
Amount and the deviation of the feedback flow；
S52, according to setting flow and the deviation for feeding back flow, flow control valve is calculated by pi regulator in real time
It is flow-compensated；
S6, while step S5 is carried out, the actual aperture of the flow control valve measured by step S4 is fed back,
As feedback aperture, aperture ring processing is carried out to feedback aperture, obtains the aperture compensation of flow control valve, the aperture ring processing
Comprising：
S61, setting flow in step sl postpone the X seconds (X takes the 2-5 seconds) after slope is handled in place, measured by step
The deviation of the final aperture of the flow control valve obtained in S3 and the feedback aperture；
S62, according to the deviation of final aperture and feedback aperture, flow control valve is calculated by PC adjusters in real time
Aperture compensates；
S7, by the initial setting aperture of flow control valve, response compensation, the compensation of flow-compensated and aperture, control is final together
(quite initially four setting aperture, flow-compensated, aperture compensation and response compensation amounts are added aperture o controller.This four
Compensation rate is all using % to count), the final aperture updated, opening for flow control valve is controlled with the final aperture of the renewal
Degree, the actual flow of the flow control valve updated and actual aperture
After S8, the actual flow of the flow control valve updated and actual aperture, repeat the above steps S5-S7, until
Flow control valve power cut-off.
In the present embodiment：The delay X seconds refer both to delay 4 seconds after the slope processing.
The present invention program can give full play to the performance of new flow control valve equipment after implementing, effectively raise flow tune
Save the response speed of valve.To such as table 1, (former valve refers to flow control valve of the prior art to experimental data, and new valve refers to the present invention's
Flow control valve).
The flow control valve double -loop control effect of table 1
In " bicyclic " dynamic control, water-carrying capacity quick response is precisely adjusted in place, and realizing makes through steel plate total length
Cooling stops temperature and the difference of desired value is controlled within ± 25 DEG C.Be advantageous to the production of quality plate, ensure the equal of material
Even property.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to the explanation present invention's
Purpose, and limitation of the invention is not used as, as long as in the essential scope of the present invention, the change to embodiment described above
Change, modification will all fall in the range of the claim of the present invention.
Claims (6)
1. a kind of double loop control of flow control valve, it is characterised in that comprise the following steps：
S1, the cooling water flow of flow control valve is set, slope processing is carried out to setting flow；
S2, setting working curve of the flow by flow control valve after slope is handled, obtain the initial of flow control valve and set
Determine aperture, meanwhile, setting response compensation；
S3, the final aperture of flow control valve is controlled to export control together by the initial setting aperture and response compensation of flow control valve
Device processed, the final aperture of flow control valve is obtained, opened by the final aperture control flow control valve of the flow control valve；
S4, after flow control valve is opened, measure the actual flow of flow control valve and actual aperture；
S5, the actual flow of the flow control valve measured is fed back, turn into feedback flow, flow is carried out to feedback flow
Ring processing, obtains the flow-compensated of flow control valve；
S6, while step S5 is carried out, the actual aperture of the flow control valve measured by step S4 is fed back, turned into
Aperture is fed back, aperture ring processing is carried out to feedback aperture, obtains the aperture compensation of flow control valve；
S7, final aperture is controlled by the initial setting aperture of flow control valve, response compensation, the compensation of flow-compensated and aperture together
O controller, the final aperture updated, the aperture of flow control valve is controlled with the final aperture of the renewal, is updated
Flow control valve actual flow and actual aperture；
After S8, the actual flow of the flow control valve updated and actual aperture, repeat the above steps S5-S7, until flow
Regulating valve power cut-off.
2. the double loop control of flow control valve as claimed in claim 1, it is characterised in that the setting of the response compensation
Formula is：
Response compensation=(setting changes in flow rate amount × G) %, compensates amplitude limit 0~1%；
Wherein, the setting changes in flow rate amount refers to the changing value of front and rear cycle set flow；The G is in response to compensation model
Coefficient, when setting changes in flow rate, G=0.004, postpone the X seconds after slope is handled when setting flow, G=0；The compensation limit
Width is in response to the clipping range of compensation model output.
3. the double loop control of flow control valve as claimed in claim 1, it is characterised in that the flow in the step S5
Ring processing includes：
S51, setting flow in step sl postpone the X seconds after slope is handled in place, measurement setting flow and the feedback flow
The deviation of amount；
S52, according to setting flow and feeding back the deviation of flow, the flow of flow control valve is calculated in real time by pi regulator
Compensation.
4. the double loop control of flow control valve as claimed in claim 1, it is characterised in that the aperture in the step S6
Ring processing includes：
S61, setting flow in step sl postpone the X seconds after slope is handled in place, measure the flow by being obtained in step S3
The deviation of the final aperture of regulating valve and the feedback aperture；
S62, according to the deviation of final aperture and feedback aperture, the aperture of flow control valve is calculated in real time by PC adjusters
Compensation.
5. the double loop control of the flow control valve as described in claim any one of 2-4, it is characterised in that：
The X seconds are the 2-5 seconds.
6. the double loop control of flow control valve as claimed in claim 5, it is characterised in that：
The X seconds take 4 seconds.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681144.7A CN107765716B (en) | 2016-08-17 | 2016-08-17 | Double-ring control method of flow regulating valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681144.7A CN107765716B (en) | 2016-08-17 | 2016-08-17 | Double-ring control method of flow regulating valve |
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| CN107765716A true CN107765716A (en) | 2018-03-06 |
| CN107765716B CN107765716B (en) | 2020-10-27 |
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| CN201610681144.7A Active CN107765716B (en) | 2016-08-17 | 2016-08-17 | Double-ring control method of flow regulating valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109667973A (en) * | 2019-01-16 | 2019-04-23 | 苏州仁甬得物联科技有限公司 | A kind of high-precision flow valve control system |
| CN111765287A (en) * | 2020-06-29 | 2020-10-13 | 瑞纳智能设备股份有限公司 | Valve with embedded artificial intelligence computing module and adjusting method thereof |
| CN113883910A (en) * | 2021-10-19 | 2022-01-04 | 攀钢集团西昌钢钒有限公司 | Method for controlling regulating valve by control system when throttling flowmeter is in dead zone |
| CN117226224A (en) * | 2023-11-16 | 2023-12-15 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109667973A (en) * | 2019-01-16 | 2019-04-23 | 苏州仁甬得物联科技有限公司 | A kind of high-precision flow valve control system |
| CN111765287A (en) * | 2020-06-29 | 2020-10-13 | 瑞纳智能设备股份有限公司 | Valve with embedded artificial intelligence computing module and adjusting method thereof |
| CN113883910A (en) * | 2021-10-19 | 2022-01-04 | 攀钢集团西昌钢钒有限公司 | Method for controlling regulating valve by control system when throttling flowmeter is in dead zone |
| CN113883910B (en) * | 2021-10-19 | 2023-05-16 | 攀钢集团西昌钢钒有限公司 | Method for controlling regulating valve by control system when throttle flowmeter is in dead zone |
| CN117226224A (en) * | 2023-11-16 | 2023-12-15 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
| CN117226224B (en) * | 2023-11-16 | 2024-01-23 | 苏芯物联技术(南京)有限公司 | Welding protection air flow real-time intelligent control method |
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| CN107765716B (en) | 2020-10-27 |
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