CN103913202B - Ultrasonic water meter intercepts coefficient processing method - Google Patents
Ultrasonic water meter intercepts coefficient processing method Download PDFInfo
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- CN103913202B CN103913202B CN201410148859.7A CN201410148859A CN103913202B CN 103913202 B CN103913202 B CN 103913202B CN 201410148859 A CN201410148859 A CN 201410148859A CN 103913202 B CN103913202 B CN 103913202B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000003672 processing method Methods 0.000 title claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000005111 flow chemistry technique Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention relates to ultrasonic flow detection technique field, more particularly to a kind of ultrasonic water meter intercepts coefficient processing method,（A）The calculated value of last time interception coefficient is taken out from internal memory；（B）The time difference that this detection is obtained is taken out from internal memory；（C）This interception FACTOR P is obtained according to step A, Bn；（D）Judge PnWith default minimum value PminAnd maximum PmaxBetween relation, desired value is write into internal memory；（E）Judge PnWith default threshold value P1And P2Between relation, into different flow processing routines.By introducing interception coefficient, the time of this measurement is associated with last time interception coefficient, the characteristic that will not be mutated using fluid flow in ultrasonic water meter, the time difference of this detection is judged, different flow handling processes is entered according to the difference of result of determination, the result so calculated is more accurate and can greatly improve the initial-flow performance indications of flow detection.
Description
Technical field
The present invention relates to ultrasonic flow detection technique field, more particularly to a kind of ultrasonic water meter interception coefficient processing side
Method.
Background technology
Ultrasonic water meter is to use ultrasonic wave time difference principle, the all-electronin water being fabricated by using technical grade electronic component
Table, high with precision compared with mechanical water meter, good reliability, range ratio is wide, and service life is long, without any movable part,
Without arrange parameter, the advantages of any angle is installed, with the development of the society, the use of ultrasonic water meter is more and more wider.
Ultrasonic water meter utilizes ultrasonic pulse downstream propagation times and adverse current propagation time in a fluid in measurement
Difference measures rate of flow of fluid, goes out the flow of fluids within pipes further according to pipeline section areal calculation.In measurement, due to ultrasound
Ripple in water transmission speed quickly, either downstream propagation times or adverse current propagation time all very littles, therefore to the measurement of time
Required precision is very high.Existing measurement is all that ultrasonic pulse is in fluid downstream propagation process using a high-frequency count clock
In, i.e., from be transmitted into receive during counter high-frequency count clock is counted, its downstream propagation times t is exactly to count
Value L divided by high-frequency count clock frequency f；The adverse current propagation time is also to be calculated by the count value of counter similarly.
Existing ultrasonic water meter simply carries out the calculating of flow when being calculated according to current ultrasonic propagation time, and it is counted
Calculating the reliability of result cannot ensure.
The content of the invention
Coefficient processing method is intercepted it is an object of the invention to provide a kind of ultrasonic water meter, it is ensured that ultrasonic water meter flow
The Stability and veracity of calculating.
To realize object above, the technical solution adopted by the present invention is：（A）The meter of last time interception coefficient is taken out from internal memory
Calculation value, is designated as Pn-1, wherein interception coefficient most initial value is 0；（B）The time difference t that this detection is obtained is taken out from internal memory；（C）
This interception FACTOR Pn=k1×Pn-1+ k2×t；（D）Judge PnWith default minimum value PminAnd maximum PmaxBetween pass
System, if Pn≤Pmin, then by PminInternal memory is write, if Pn≥Pmax, then by PmaxInternal memory is write, otherwise by PnWrite internal memory；（E）Sentence
Disconnected PnWith default threshold value P1And P2Between relation, if Pn≥P2, then normal flow processing routine is performed, if Pn≤P1,
It is 0 directly to set this flow detected, if P1＜ Pn＜ P2, then into flowed fluctuation processing routine.
Compared with prior art, there is following technique effect in the present invention：By introduce interception coefficient, by this measurement when
Between with last time interception coefficient it is associated, the characteristic that will not be mutated using fluid flow in ultrasonic water meter, to this detect when
Between difference judged that, according to the difference of result of determination into different flow handling processes, the result so calculated is more
Accurately and stably.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment
With reference to Fig. 1, the present invention is described in further detail.
A kind of ultrasonic water meter intercepts coefficient processing method, comprises the following steps：（A）Last time interception system is taken out from internal memory
Several calculated values, is designated as Pn-1, wherein interception coefficient most initial value is 0；（B）Taken out from internal memory this detection obtain when
Poor t；（C）This interception FACTOR Pn=k1×Pn-1+ k2×t；（D）Judge PnWith default minimum value PminAnd maximum Pmax
Between relation, if Pn≤Pmin, then by PminInternal memory is write, if Pn≥Pmax, then by PmaxInternal memory is write, otherwise by PnIn write-in
Deposit；（E）Judge PnWith default threshold value P1And P2Between relation, if Pn≥P2, then normal flow processing routine is performed, if
Pn≤P1, it is 0 directly to set this flow detected, if P1＜ Pn＜ P2, then into flowed fluctuation processing routine.Here, lead to
Cross introducing interception FACTOR P, and this interception coefficient be by the interception coefficient that is stored in last time internal memory, this detect obtain when
What difference was calculated, then judge to intercept the situation of change of coefficient, different processing routines are carried out, the result that so processing is obtained is more
To be accurate.
It is used as the preferred scheme of the present invention, in described step C, 0.9 ＜ k1＜ 1, k2＞ 0；In described step E, threshold value
P1、P2Meet relational expression：Pmin＜ P1＜ P2＜ Pmax。
The initial-flow performance indications of flow detection can be greatly improved using the method, in general initial-flow is minimum
The 1/8 of flow, this method can be reduced between 1/10 to 1/12；In addition this method can also lift the stability of flow measurement and refer to
Mark, can be such that the stability error of water meter is maintained between 0.12% to 0.5%.For DN15 water meters, contrast using before this programme with
Initial-flow characteristic after this programme and quantification stability attribute testing data record are as follows, wherein initial-flow for water meter herein
Stable operation at least 100h data under flow, stability error is the number range of at least 10 groups experimental datas, described in experiment
Q1 be minimum discharge, implication be require water meter indicating value meet allow worst error minimum flow；Q2 is boundary flow, is led to
Between flow Q3 and minimum discharge Q1, the category of flow is often resolved into two high areas for there are the specific limits of error conventional
With low area's flow, Q3 is conventional flow, refers to maximum allowable flow under nominal operating conditions, under this flow, ultrasound
The limits of error should be met during ripple water meter normal work, it is as a result as follows：
| Form | Initial-flow | Q1 stability errors | Q2 stability errors | Q3 stability errors |
| Before use | 3-4L/h | 0.75%-0.84% | 0.31%-0.35% | 0.24%-0.26% |
| After use | 2-3L/h | 0.32%-0.41% | 0.22%-0.27% | 0.15%-0.21% |
By experimental data we it can be found that the present invention can significantly reduce Q1 stability errors, and initial-flow
And Q2, Q3 stability error have also reduced, the precision and stability of water meter is obtained for effective lifting.
Claims (1)
1. a kind of ultrasonic water meter intercepts coefficient processing method, comprise the following steps：
(A) calculated value of last time interception coefficient is taken out from internal memory, P is designated asn-1, wherein interception coefficient most initial value is 0；
(B) time difference t that this detection is obtained is taken out from internal memory；
(C) this interception FACTOR Pn=k1×Pn-1+k2×t；
(D) P is judgednWith default minimum value PminAnd maximum PmaxBetween relation, if Pn≤Pmin, then by PminIn write-in
Deposit, if Pn≥Pmax, then by PmaxInternal memory is write, otherwise by PnWrite internal memory；
(E) P is judgednWith default threshold value P1And P2Between relation, if Pn≥P2, then normal flow processing routine is performed,
If Pn≤P1, it is 0 directly to set this flow detected, if P1＜ Pn＜ P2, then into flowed fluctuation processing routine；
In described step C, 0.9 ＜ k1＜ 1, k2＞ 0；In described step E, threshold value P1、P2Meet relational expression：Pmin＜ P1＜
P2＜ Pmax。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104949724B (en) * | 2015-07-10 | 2017-11-21 | 安徽水联水务科技有限公司 | The dynamic econometric analysis of supersonic wave metering instrument |
| CN107621292B (en) * | 2017-07-25 | 2021-04-09 | 辽宁航宇星物联仪表科技有限公司 | Wave-missing compensation method for household ultrasonic water meter |
| CN109632054A (en) * | 2018-12-11 | 2019-04-16 | 北京沃尔斯特新技术有限公司 | A kind of method of big data water weight method evaluation water meter actual metered error |
| CN114485863A (en) * | 2021-12-24 | 2022-05-13 | 广东艾科技术股份有限公司 | Flow error correction method, system, computer and medium for ultrasonic water meter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202248A (en) * | 1995-09-25 | 1998-12-16 | 施蓝姆伯格工业公司 | Method for acoustically measuring fluid flow rate |
| WO2010042713A1 (en) * | 2008-10-08 | 2010-04-15 | Expro Meters, Inc. | Viscous fluid flow measurement using a differential pressure measurement and a sonar measured velocity |
| CN102042860A (en) * | 2009-10-12 | 2011-05-04 | Vega格里沙贝两合公司 | Segment-based signal processing |
| CN102272560A (en) * | 2009-01-06 | 2011-12-07 | 松下电器产业株式会社 | Flow rate measurement device |
| CN102435265A (en) * | 2011-09-19 | 2012-05-02 | 苏州聚元微电子有限公司 | Precision correction method for transit time ultrasonic flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5287626B2 (en) * | 2009-03-03 | 2013-09-11 | パナソニック株式会社 | Flow measuring device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1202248A (en) * | 1995-09-25 | 1998-12-16 | 施蓝姆伯格工业公司 | Method for acoustically measuring fluid flow rate |
| WO2010042713A1 (en) * | 2008-10-08 | 2010-04-15 | Expro Meters, Inc. | Viscous fluid flow measurement using a differential pressure measurement and a sonar measured velocity |
| CN102272560A (en) * | 2009-01-06 | 2011-12-07 | 松下电器产业株式会社 | Flow rate measurement device |
| CN102042860A (en) * | 2009-10-12 | 2011-05-04 | Vega格里沙贝两合公司 | Segment-based signal processing |
| CN102435265A (en) * | 2011-09-19 | 2012-05-02 | 苏州聚元微电子有限公司 | Precision correction method for transit time ultrasonic flowmeter |
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