CN112964337A - Calibration system and method applied to ultrasonic gas meter - Google Patents

Calibration system and method applied to ultrasonic gas meter Download PDF

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Publication number
CN112964337A
CN112964337A CN202110285825.2A CN202110285825A CN112964337A CN 112964337 A CN112964337 A CN 112964337A CN 202110285825 A CN202110285825 A CN 202110285825A CN 112964337 A CN112964337 A CN 112964337A
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China
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flow
pulse
gas flow
data
ultrasonic
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CN202110285825.2A
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Inventor
刘勋
李中华
陈伟明
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Chengdu Qianjia Technology Co Ltd
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Chengdu Qianjia Technology Co Ltd
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Priority to CN202110285825.2A priority Critical patent/CN112964337A/en
Publication of CN112964337A publication Critical patent/CN112964337A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/15Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters

Abstract

The invention discloses a calibration system and a calibration method applied to an ultrasonic gas meter.A flow acquisition module acquires gas flow velocity data in a metering pipeline every t seconds; the data processing module makes a pulse sending strategy according to the current time gas flow rate data and the current gas flow grade, and meanwhile, the independent pulse generating module sends pulses to the standard test board according to the pulse sending strategy, and the independent pulse generating module and the data processing module run in parallel; the standard test board calculates to obtain measured flow data based on all pulses received within calibration measurement time, and compares the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter; an independent pulse generation module and a data processing module are introduced to run in parallel; the time consumption can be reduced, the loss error can be avoided, the sampling time interval and the pulse trigger threshold value of the grade are set according to the grade of the gas flow, and the precision of the calibration system is improved.

Description

Calibration system and method applied to ultrasonic gas meter
Technical Field
The invention relates to the technical field of ultrasonic gas metering, in particular to a calibration system and method applied to an ultrasonic gas meter.
Background
Along with the increasingly high requirement of gas measurement precision in the gas measurement field, ultrasonic gas meters are emerging. Compared with a membrane type gas meter, the ultrasonic gas meter has the advantages of wide measuring range, small volume, simple structure, high measuring precision, good stability and the like; however, the ultrasonic gas meter is of a full-electronic structure, and has no character wheel, so that the ultrasonic gas meter cannot be calibrated by using the sonic nozzle test table, and the existing ultrasonic gas meter needs to detect errors when leaving the factory.
In the existing ultrasonic gas meter calibration system, the following problems still exist:
1. if the ultrasonic gas meter and the test bench directly communicate through a WIFI wireless mode or a wired mode, the test bench needs to be modified at high cost, and the wired mode is not suitable for use in a high-ground-temperature environment.
2. The existing ultrasonic gas meter consumes long time in the communication process of sampling and test board, easily loses pulse, and affects the judgment precision of the test board.
Disclosure of Invention
In order to solve the technical problems, the ultrasonic gas meter calibration system is improved based on the existing ultrasonic gas meter calibration system, an independent pulse generation module and a data processing module are arranged to run in parallel, time consumption is reduced, and pulses are triggered in time, so that a test board receives complete pulses, and pulse loss is reduced.
The invention is realized by the following technical scheme:
this scheme provides a calibration system for ultrasonic wave gas table, including standard test platform and ultrasonic wave gas table device, ultrasonic wave gas table device includes: the device comprises a flow acquisition module, a data processing module and an independent pulse generation module;
the flow acquisition module acquires gas flow speed data in the metering pipeline every t seconds;
the data processing module makes a pulse sending strategy according to the current time gas flow rate data and the current gas flow grade, and meanwhile, the independent pulse generating module sends pulses to the standard test board according to the pulse sending strategy, and the independent pulse generating module and the data processing module run in parallel;
the standard test board calculates to obtain measured flow data based on all pulses received within the calibration measurement time, and compares the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
The working principle of the scheme is as follows: in the prior art, after sampling of an ultrasonic gas meter, data needs to be sent to a test bench through pulses, the test bench judges whether the ultrasonic gas meter needs to be calibrated or not, after sampling of the ultrasonic gas meter, a metering module calculates the sampled data, the pulses are sent only after the metering module completes the calculation, and the metering module needs to perform next calculation after the pulses are sent, so that not only is time consumption long, but also a series of pulses are sent to the test bench each time, when the test bench is not ready to receive or has a fault, the pulses are easily lost, the loss error is caused, and in the pulse sending period, the metering module cannot timely sample the data and calculate, and the flow calculation is inaccurate; in the scheme, a data processing module makes a pulse sending strategy, and simultaneously an independent pulse generation module sends pulses to a standard test board according to the pulse sending strategy, wherein the independent pulse generation module and the data processing module run in parallel; not only can reduce time consumption, but also can avoid losing errors; in the prior art, pulse sending and metering calculation are equivalent to serial operation, and the scheme introduces an independent pulse generation module and a data processing module to operate in parallel, so that the precision of the system is effectively calibrated.
In the prior art, the pulse equivalent (the flow represented by one pulse) sent to the test bench is set in advance and is fixed and unchangeable, when the pulse equivalent is set to be small, when the gas flow is large, intensive pulse triggering can be generated, the test bench cannot identify the pulse due to overlarge pulse density, and at the moment, the test bench cannot realize corresponding functions; on the contrary, when the pulse equivalent is set to be too large, when the gas flow is small, few pulse triggers can be generated, the test board cannot realize the corresponding function (the existing flow metering precision is limited), and the test board cannot realize the corresponding function at the moment; when the gas flow changes, need reset, the extension calibration time, the calibration process is also loaded down with trivial details, and data processing module formulates the pulse and sends the strategy according to current gas flow grade in this scheme, appoints different adaptation pulse according to current gas flow grade and sends the strategy, and the self-adaptation process through data processing module in time realizes the adjustment of pulse density, has avoided the intensive pulse that the gas flow produced when very big to trigger, produces few pulse triggering phenomenon when the gas flow is very little.
The further optimization scheme is that the specific process of the data processing module for formulating the pulse sending strategy according to the current gas flow data is as follows:
the data processing module determines the pulse width of the pulse based on the known gas flow grade and the precision requirement and sends the pulse width to the independent pulse generation module;
the data processing module determines a pulse sending instruction according to the flow metering model based on the current time gas flow rate data and the known gas flow grade and sends the pulse sending instruction to the independent pulse generating module.
The further optimization scheme is that the specific process for determining the pulse sending instruction is as follows:
s1, multiplying current time gas flow rate data by sampling interval time t to obtain current time gas flow;
s2, judging whether the gas flow at the current time exceeds a pulse trigger threshold value:
if yes, generating a pulse sending instruction, taking the data exceeding the pulse triggering threshold value as the gas flow rate data at the current time, repeating S2 until the gas flow at the current time is smaller than the pulse triggering threshold value, and entering S3;
and S3, taking the sum of the gas flow at the next time and the gas flow at the current time as the gas flow at the next time, and circulating S1-S3 until the end of the calibration measurement time.
When the calculated gas flow is accumulated to the pulse triggering threshold value, a pulse sending instruction is generated, the gas flow exceeding the pulse sending instruction is used as the gas flow at the next time for judgment, an even pulse sending instruction can be generated, and the problem that the system precision is influenced when a series of pulses are sent to the test bench is avoided.
The further optimization scheme is that the gas flow grade comprises the following steps: a small flow level, a medium flow level and a large flow level;
the flow range of the small flow level is as follows: 16L/h-250L/h;
the flow range of the medium flow magnitude is as follows: 251L/h-4000L/h;
the flow range of the large-flow stage is as follows: 4001L/h-6000L/h.
The further optimization scheme is that when the gas flow grade is a small flow grade, the pulse trigger threshold value is as follows: 1 plus or minus 0.5L;
when the gas flow grade is the medium flow grade, the pulse triggering threshold value is as follows: 5 plus or minus 0.5L;
when the gas flow grade is a high flow grade, the pulse trigger threshold value is as follows: 10 plus or minus 0.5L;
the further optimization scheme is that when the gas flow level is a small flow level, t is 15 ms;
when the gas flow level is the medium flow level, t is 7.5 ms;
when the gas flow grade is a high-flow grade, t is 3.75 ms.
In the process of determining the pulse sending instruction, the gas flow rate is considered to be constant in each interval time period, and the actual gas flow rate is inevitably not constant at the sampling speed, so that the sampling time interval and the pulse triggering threshold value of the level are set according to the gas flow level when different gas flow levels are adopted, and the accuracy of a calibration system can be improved.
When the gas flow level is a large flow level, the flow metering model is greatly influenced by fluctuation errors, so that a small sampling time interval t is set to be 3.75ms, when the gas flow level is a small flow level, the flow metering model is slightly influenced by the fluctuation errors, and a large sampling time interval t is set to be 15 ms.
The further optimization scheme is that the standard test board judges whether the error value of the ultrasonic gas meter is within a preset range so as to determine whether to calibrate the ultrasonic gas meter.
Based on the calibration system applied to the ultrasonic gas meter, the scheme provides a calibration method applied to the ultrasonic gas meter, and the calibration method comprises the following steps;
collecting gas flow rate data in the metering pipeline every t seconds within the calibration measurement time;
a pulse sending strategy is formulated according to the current time gas flow rate data and the current gas flow grade, and pulses are sent to the standard test board according to the pulse sending strategy;
and calculating to obtain measured flow data based on all pulses received within the calibration measurement time, and comparing the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
The further optimization scheme is that the standard test bench judges whether the error value of the ultrasonic gas meter is in a preset range,
if not, sending the corresponding standard flow data to the ultrasonic gas meter for calibration;
if so, determining that the ultrasonic gas meter does not need to be calibrated currently.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention provides a calibration system and a calibration method applied to an ultrasonic gas meter.A data processing module makes a pulse sending strategy by introducing an independent pulse generating module, and simultaneously the independent pulse generating module sends pulses to a standard test board according to the pulse sending strategy, and the independent pulse generating module and the data processing module run in parallel; not only can reduce time consumption, but also can avoid losing errors.
2. According to the calibration system and method applied to the ultrasonic gas meter, when the gas flow grades are different, the sampling time interval and the pulse trigger threshold value of the grade are set according to the gas flow grades, the precision of the calibration system is improved, and the pulse density is timely adjusted through the self-adaptive process of the data processing module.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic structural diagram of a calibration system applied to an ultrasonic gas meter;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
This embodiment provides a calibration system for ultrasonic wave gas table, including standard test platform and ultrasonic wave gas table device, ultrasonic wave gas table device includes: the device comprises a flow acquisition module, a data processing module and an independent pulse generation module;
the flow acquisition module acquires gas flow speed data in the metering pipeline every t seconds;
the data processing module makes a pulse sending strategy according to the current time gas flow rate data and the current gas flow grade, and meanwhile, the independent pulse generating module sends pulses to the standard test board according to the pulse sending strategy, and the independent pulse generating module and the data processing module run in parallel;
the standard test board calculates to obtain measured flow data based on all pulses received within the calibration measurement time, and compares the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
The specific process of the data processing module for formulating the pulse sending strategy according to the current gas flow data is as follows:
the data processing module determines the pulse width of the pulse based on the known gas flow grade and the precision requirement and sends the pulse width to the independent pulse generation module;
the data processing module determines a pulse sending instruction according to the flow metering model based on the current time gas flow rate data and the known gas flow grade and sends the pulse sending instruction to the independent pulse generating module.
The specific process for determining the pulse sending instruction comprises the following steps:
s1, multiplying current time gas flow rate data by sampling interval time t to obtain current time gas flow;
s2, judging whether the gas flow at the current time exceeds a pulse trigger threshold value:
if yes, generating a pulse sending instruction, taking the data exceeding the pulse triggering threshold value as the gas flow rate data at the current time, repeating S2 until the gas flow at the current time is smaller than the pulse triggering threshold value, and entering S3;
and S3, taking the sum of the gas flow at the next time and the gas flow at the current time as the gas flow at the next time, and circulating S1-S3 until the end of the calibration measurement time.
The gas flow rate class includes: a small flow level, a medium flow level and a large flow level;
the flow range of the small flow level is as follows: 16L/h-250L/h;
the flow range of the medium flow magnitude is as follows: 251L/h-4000L/h;
the flow range of the large-flow stage is as follows: 4001L/h-6000L/h.
In this embodiment, when the gas flow level is a small flow level, the pulse trigger threshold value is 1L; when the gas flow level is the medium flow level, the pulse trigger threshold value is 5L; when the gas flow level is a high-flow level, the pulse trigger threshold value is 10L;
when the gas flow level is a small flow level, t is 15 ms;
when the gas flow level is the medium flow level, t is 7.5 ms;
when the gas flow grade is a high-flow grade, t is 3.75 ms.
The standard test board judges whether the error value of the ultrasonic gas meter is within a preset range or not so as to determine whether the ultrasonic gas meter is calibrated or not.
Example 2
A calibration method applied to an ultrasonic gas meter is applied to a calibration system applied to the ultrasonic gas meter in embodiment 1, and comprises the following steps;
collecting gas flow rate data in the metering pipeline every t seconds within the calibration measurement time;
a pulse sending strategy is formulated according to the current time gas flow rate data and the current gas flow grade, and pulses are sent to the standard test board according to the pulse sending strategy;
and calculating to obtain measured flow data based on all pulses received within the calibration measurement time, and comparing the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
The standard test board judges whether the error value of the ultrasonic gas meter is in a preset range,
if not, sending the corresponding standard flow data to the ultrasonic gas meter for calibration;
if so, determining that the ultrasonic gas meter does not need to be calibrated currently.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. The utility model provides a calibration system for ultrasonic wave gas table which characterized in that, includes standard testboard and ultrasonic wave gas table device, ultrasonic wave gas table device includes: the device comprises a flow acquisition module, a data processing module and an independent pulse generation module;
the flow acquisition module acquires gas flow speed data in the metering pipeline every t seconds;
the data processing module makes a pulse sending strategy according to the current time gas flow rate data and the current gas flow grade, and meanwhile, the independent pulse generating module sends pulses to the standard test board according to the pulse sending strategy, and the independent pulse generating module and the data processing module run in parallel;
the standard test board calculates to obtain measured flow data based on all pulses received within the calibration measurement time, and compares the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
2. The calibration system applied to the ultrasonic gas meter according to claim 1, wherein the specific process of the data processing module for formulating the pulse transmission strategy according to the current gas flow data is as follows:
the data processing module determines the pulse width of the pulse based on the known gas flow grade and the precision requirement and sends the pulse width to the independent pulse generation module;
the data processing module determines a pulse sending instruction according to the flow metering model based on the current time gas flow rate data and the known gas flow grade and sends the pulse sending instruction to the independent pulse generating module.
3. The calibration system applied to the ultrasonic gas meter according to claim 2, wherein the specific process of determining the pulse sending command is as follows:
s1, multiplying current time gas flow rate data by sampling interval time t to obtain current time gas flow;
s2, judging whether the gas flow at the current time exceeds a pulse trigger threshold value:
if yes, generating a pulse sending instruction, taking the data exceeding the pulse triggering threshold value as the gas flow rate data at the current time, repeating S2 until the gas flow at the current time is smaller than the pulse triggering threshold value, and entering S3;
and S3, taking the sum of the gas flow at the next time and the gas flow at the current time as the gas flow at the next time, and circulating S1-S3 until the end of the calibration measurement time.
4. The calibration system for the ultrasonic gas meter according to claim 3, wherein the gas flow rate class comprises: a small flow level, a medium flow level and a large flow level;
the flow range of the small flow level is as follows: 16L/h-250L/h;
the flow range of the medium flow magnitude is as follows: 251L/h-4000L/h;
the flow range of the large-flow stage is as follows: 4001L/h-6000L/h.
5. The calibration system for the ultrasonic gas meter according to claim 4,
when the gas flow level is a small flow level, the pulse trigger threshold value is as follows: 1 plus or minus 0.5L;
when the gas flow grade is the medium flow grade, the pulse triggering threshold value is as follows: 5 plus or minus 0.5L;
when the gas flow grade is a high flow grade, the pulse trigger threshold value is as follows: 10 +/-0.5L.
6. The calibration system for the ultrasonic gas meter according to claim 4,
when the gas flow level is a small flow level, t is 15 ms;
when the gas flow level is the medium flow level, t is 7.5 ms;
when the gas flow grade is a high-flow grade, t is 3.75 ms.
7. The calibration system for the ultrasonic gas meter according to claim 1, wherein the standard test board determines whether an error value of the ultrasonic gas meter is within a preset range to determine whether to calibrate the ultrasonic gas meter.
8. A calibration method applied to an ultrasonic gas meter is applied to the calibration system applied to the ultrasonic gas meter, which is disclosed by claims 1-7, and is characterized by comprising the following steps;
collecting gas flow rate data in the metering pipeline every t seconds within the calibration measurement time;
a pulse sending strategy is formulated according to the current time gas flow rate data and the current gas flow grade, and pulses are sent to the standard test board according to the pulse sending strategy;
and calculating to obtain measured flow data based on all pulses received within the calibration measurement time, and comparing the measured flow data with the standard flow data to obtain an error value of the ultrasonic gas meter so as to calibrate the ultrasonic gas meter.
9. The calibration method for the ultrasonic gas meter according to claim 8, wherein the standard test station determines whether an error value of the ultrasonic gas meter is within a preset range,
if not, sending the corresponding standard flow data to the ultrasonic gas meter for calibration;
if so, determining that the ultrasonic gas meter does not need to be calibrated currently.
CN202110285825.2A 2021-03-17 2021-03-17 Calibration system and method applied to ultrasonic gas meter Pending CN112964337A (en)

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Application Number Priority Date Filing Date Title
CN202110285825.2A CN112964337A (en) 2021-03-17 2021-03-17 Calibration system and method applied to ultrasonic gas meter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113405620A (en) * 2021-08-20 2021-09-17 成都千嘉科技有限公司 Method for reducing ultrasonic meter power consumption based on zero flow identification and zero flow calibration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113405620A (en) * 2021-08-20 2021-09-17 成都千嘉科技有限公司 Method for reducing ultrasonic meter power consumption based on zero flow identification and zero flow calibration

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