CN104503498A - Precise flow control method of proportional valve - Google Patents
Precise flow control method of proportional valve Download PDFInfo
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- CN104503498A CN104503498A CN201410839619.1A CN201410839619A CN104503498A CN 104503498 A CN104503498 A CN 104503498A CN 201410839619 A CN201410839619 A CN 201410839619A CN 104503498 A CN104503498 A CN 104503498A
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Abstract
The invention discloses a precise flow control method of a proportional valve. The precise flow control method includes step 1, starting a system; step 2, initializing the system; step 3, collecting a flow value of the proportional valve and performing flow value scale conversion; step 4, comparing the flow value with a preset lower limit of flow value allowance, performing the step 6 if the flow value is smaller than the lower limit of the flow value allowance, or otherwise, performing the step 5; step 5, comparing the flow value with a preset upper limit of the flow value allowance, performing the step 6 if the flow value is larger than the upper limit of the flow value allowance, or otherwise, performing the step 3; step 6, looking up a controlled quantity-flow table according to the flow value subjected to scale conversion to acquire a corresponding controlled quantity 1, looking up the controlled quantity-flow table according to a preset value to acquire a corresponding controlled quantity 2, setting an equation that preset controlled quantity = current controlled quantity + controlled quantity 2 - controlled quantity 1, and controlling flow of the proportional valve. The precise flow control method has the advantage that table look-up correction is performed on the basis of closed-loop control, and thus, precise control can be realized.
Description
Technical field
The present invention relates to flow control methods, particularly relate to a kind of accuracy control method of proportioning valve flow.
Background technology
In flow control application instantly, usual usage ratio valve controls flow, especially realize accurately controlling to gas flow at medical device industry usage ratio valve, this control is that the extent of opening by directly exporting a controlled quentity controlled variable control ratio valve carries out open loop realization.But in this flow control application, also exist and show bad problem in actual applications, trace it to its cause and can easily analyze out: the inadequate natural endowment had due to opened loop control causes, such environmental effects is such as: variation of ambient temperature, atmospheric pressure change, the impact of these factors is all outwardness, only be varying in size of influence degree, and its impact will be reduced need to construct reasonable environment to meet, but such cost is high sometimes even cannot realizing.In addition, part of appliance can, along with time and environmental factor natural decay, also be all cause the not good reason of control effects in the middle of application.
Summary of the invention
In view of this, the object of the invention is for the deficiencies in the prior art, provide a kind of accuracy control method of proportioning valve flow, this control method carries out correction of tabling look-up again on the basis of closed-loop control, can realize accurate control.
For achieving the above object, the present invention by the following technical solutions:
An accuracy control method for proportioning valve flow, the present invention includes following steps:
Step 1, system brings into operation;
Step 2, carries out initialization;
Step 3, gathers the flow value of proportioning valve and carries out flow value scale transformation;
Step 4, compares flow value and the flow value franchise lower limit preset, when performing step 6 in limited time under flow value < flow value franchise; Step 5 is performed in limited time under flow value is not less than flow value franchise;
Step 5, compares flow value and the flow value high tolerance preset, and performs step 6, otherwise perform step 3 when the flow value high tolerance that flow value > presets;
Step 6, corresponding controlled quentity controlled variable 1 is obtained by the flow value inquiry controlled quentity controlled variable-flowmeter after scale transformation, corresponding controlled quentity controlled variable 2 is obtained by setting flow inquiry controlled quentity controlled variable-flowmeter, setup control amount=current controlled quentity controlled variable+controlled quentity controlled variable 2-controlled quentity controlled variable 1, carry out the flow control of proportioning valve, then return step 3.
The invention has the beneficial effects as follows:
The present invention carries out correction of tabling look-up again on the basis of closed-loop control, when the flow value collected is outside the flow value tolerance preset, carries out correction of tabling look-up, obtains the setup control amount of the flow of revised proportioning valve.The present invention is under the prerequisite ensureing proportioning valve accurate flow control, and low, the easy realization of whole method cost, long-time stability are good.
Accompanying drawing explanation
Fig. 1 is control flow chart of the present invention.
Fig. 2 is controlled quentity controlled variable of the present invention-flowmeter example.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the present invention includes following steps:
Step 1, system brings into operation;
Step 2, carries out initialization; Be initialized as system cloud gray model set up necessary environment and only carry out once;
Step 3, gathers the flow value of proportioning valve and carries out flow value scale transformation;
Step 4, compares flow value and the flow value franchise lower limit preset, when performing step 6 in limited time under flow value < flow value franchise; Step 5 is performed in limited time under flow value is not less than flow value franchise;
Step 5, compares flow value and the flow value high tolerance preset, and performs step 6, otherwise perform step 3 when the flow value high tolerance that flow value > presets;
Step 6, corresponding controlled quentity controlled variable 1 is obtained by the flow value inquiry controlled quentity controlled variable-flowmeter after scale transformation, obtain corresponding controlled quentity controlled variable 2 by setting flow inquiry controlled quentity controlled variable-flowmeter, setting flow here refers to the flow of the expectation that operator or medical personnel set according to professional knowledge.Setup control amount=current controlled quentity controlled variable+controlled quentity controlled variable 2-controlled quentity controlled variable 1, obtains the setup control amount (setup control amount refers to the controlled quentity controlled variable of output, and this amount is dynamic change in whole process) of revised proportioning valve flow, carries out the flow control of proportioning valve.Then return step 3, continue to gather proportioning valve flow value.
Step 7, by the setup control amount obtained, the flow of comparative example valve controls.
Figure 2 shows that a kind of example of controlled quentity controlled variable-flowmeter of the present invention, controlled quentity controlled variable-flowmeter is the flow and controlled quentity controlled variable that require according to different application, is stored in the control module of operation after being measured specially by producer.The left column numerical value of form is control measure certificate, and right columns value is data on flows.
The present invention carries out correction of tabling look-up again on the basis of closed-loop control, compare with the flow value franchise preset after scale transformation is carried out to the flow value collected, when the flow value collected is outside the flow value tolerance preset, table look-up according to flow value and revise the setup control amount of proportioning valve flow, obtain the setup control amount of revised proportioning valve flow.When the flow value collected does not exceed default flow value tolerance, proceed the collection of flow value.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (1)
1. an accuracy control method for proportioning valve flow, is characterized in that: the present invention includes following steps:
Step 1, system brings into operation;
Step 2, carries out initialization;
Step 3, gathers the flow value of proportioning valve and carries out flow value scale transformation;
Step 4, compares flow value and the flow value franchise lower limit preset, when performing step 6 in limited time under flow value < flow value franchise; Step 5 is performed in limited time under flow value is not less than flow value franchise;
Step 5, compares flow value and the flow value high tolerance preset, and performs step 6, otherwise perform step 3 when the flow value high tolerance that flow value > presets;
Step 6, corresponding controlled quentity controlled variable 1 is obtained by the flow value inquiry controlled quentity controlled variable-flowmeter after scale transformation, corresponding controlled quentity controlled variable 2 is obtained by setting flow inquiry controlled quentity controlled variable-flowmeter, setup control amount=current controlled quentity controlled variable+controlled quentity controlled variable 2-controlled quentity controlled variable 1, carry out the flow control of proportioning valve, then return step 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410839619.1A CN104503498B (en) | 2014-12-30 | 2014-12-30 | A kind of accuracy control method of proportioning valve flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410839619.1A CN104503498B (en) | 2014-12-30 | 2014-12-30 | A kind of accuracy control method of proportioning valve flow |
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| CN104503498A true CN104503498A (en) | 2015-04-08 |
| CN104503498B CN104503498B (en) | 2018-03-09 |
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| CN201410839619.1A Active CN104503498B (en) | 2014-12-30 | 2014-12-30 | A kind of accuracy control method of proportioning valve flow |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107412895A (en) * | 2017-09-08 | 2017-12-01 | 重庆山外山血液净化技术股份有限公司 | Blood purification is weighed compensation method and is weighed compensation system using the blood purification of this method |
| CN108498930A (en) * | 2018-03-31 | 2018-09-07 | 湖南明康中锦医疗科技发展有限公司 | The flow control methods of respiratory assistance apparatus proportioning valve |
| CN108549420A (en) * | 2018-04-13 | 2018-09-18 | 中国石油工程建设有限公司北京设计分公司 | A kind of flow control methods and system for multiple row field devices |
| CN109683632A (en) * | 2017-10-18 | 2019-04-26 | 株洲中车时代电气股份有限公司 | A kind of flow control methods and device |
| WO2023272542A1 (en) * | 2021-06-30 | 2023-01-05 | 深圳市科曼医疗设备有限公司 | Proportional valve control method and apparatus, computer device and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107412895A (en) * | 2017-09-08 | 2017-12-01 | 重庆山外山血液净化技术股份有限公司 | Blood purification is weighed compensation method and is weighed compensation system using the blood purification of this method |
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| CN108549420A (en) * | 2018-04-13 | 2018-09-18 | 中国石油工程建设有限公司北京设计分公司 | A kind of flow control methods and system for multiple row field devices |
| WO2023272542A1 (en) * | 2021-06-30 | 2023-01-05 | 深圳市科曼医疗设备有限公司 | Proportional valve control method and apparatus, computer device and readable storage medium |
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| Publication number | Publication date |
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| CN104503498B (en) | 2018-03-09 |
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