CN111174841B - Oscillatory flow filtering method for electronic meter at zero flow point - Google Patents
Oscillatory flow filtering method for electronic meter at zero flow point Download PDFInfo
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- CN111174841B CN111174841B CN201911388609.XA CN201911388609A CN111174841B CN 111174841 B CN111174841 B CN 111174841B CN 201911388609 A CN201911388609 A CN 201911388609A CN 111174841 B CN111174841 B CN 111174841B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
Abstract
The invention discloses an oscillating flow filtering method for an electronic meter at a zero flow point, which comprises the following steps: every initial sampling time interval t1The flow of the meter is collected once to obtain real-time flow Qs(ii) a Judging the flow QsIf the current instantaneous flow Q of the meter is not equal to Q, the current instantaneous flow Q of the meter is equal to 0s(ii) a Recording the current instantaneous flow Q of the meter and the flow Q obtained by N times of sampling before Q1、Q2、…、QNWherein N is an integer greater than or equal to 2; and judging whether the absolute value of the current instantaneous flow Q is smaller than a preset flow threshold value or not, and if the absolute value of the current instantaneous flow Q is smaller than the preset flow threshold value, carrying out zero-flow oscillating flow filtering. The invention can effectively filter the oscillating flow near the zero flow, reduce the economic loss of the zero flow oscillating flow to the user and has no influence on the normal flow and the function of the meter.
Description
Technical Field
The invention relates to the technical field of metering instruments, in particular to an oscillating flow filtering method for an electronic meter at a zero flow point.
Background
With the technological progress, the electronic metering technology of energy sources is rapidly developed, and electronic meters are well known in the meter industry. Electronic meters, including water meters, gas meters, and the like, are classified according to metering modes, mainly ultrasonic meters and thermal meters, measure fluid speed through electronic sensors, and convert the fluid speed into flow through calculation. Compared with the traditional mode meter, the electronic meter has the advantages of good repeatability, small pressure loss, long service life, high precision, small volume, no noise and the like.
The electronic meter has good performance in small flow measurement, can accurately measure the flow value below the initial flow of the meter in the traditional mode, and supports bidirectional flow measurement; however, the reverse flow does not participate in the calculation of the cumulative amount, and is only used as a judgment condition for some functions such as reverse flow. Taking a gas meter as an example, when the volume change of gas in a gas pipeline and the oscillation flow (the flow fluctuates at a certain flow point) generated by mechanical vibration of a gas pipeline occur in the gas meter due to the temperature difference change, if the oscillation occurs at a zero flow point, the generated flow can be displayed on a liquid crystal screen of the gas meter, and the positive flow is counted into the accumulated amount.
At present, threshold values of starting flows of electronic meters are mostly increased in the market, and influences caused by oscillation flows are reduced by losing the range ratio of the electronic meters. Because the amplitude of most of the actual oscillating flows is far higher than the initial flow of the meter, and the larger the oscillating flow is, the more the accumulated amount is generated in the same time, in the flow measured by the generated accumulated amount, the oscillating flows with larger oscillating amplitudes have larger specific gravity, and the method for improving the threshold of the initial flow not only loses the advantages of the electronic meter on the small flow, but also cannot achieve the ideal effect.
Disclosure of Invention
The invention provides an oscillating flow filtering method for an electronic meter at a zero flow point to solve the technical problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an oscillating flow filtering method for an electronic meter at a zero flow point comprises the following steps:
103, recording the current instantaneous flow Q and the flow Q obtained by sampling N times before the current instantaneous flow Q1、Q2、…、QNWherein N is an integer greater than or equal to 2;
and 104, judging whether the absolute value of the current instantaneous flow Q is smaller than a preset flow threshold value or not, and if the absolute value of the current instantaneous flow Q is smaller than the preset flow threshold value, carrying out zero-flow oscillating flow filtering.
Preferably, the flow rate Q is judged in the step 102sThe method of whether the start flow is less than the table is as follows:
if it is
Or
Then the flow rate QsLess than the start flow of the meter, wherein QminThe minimum metering flow of the effective range of the meter.
Preferably, the flow rate Q issThe electronic sensor module is an ultrasonic module or a thermal module.
Preferably, in the step 104, the preset flow threshold is greater than or equal to the minimum metering flow Q of the effective range of the metermin。
Preferably, in step 104, if the absolute value of the current instantaneous flow Q is greater than or equal to the preset flow threshold, it is determined whether the current instantaneous flow Q needs to be compensated, and if so, the flow compensation is performed.
Preferably, a flow rate compensation flag F is setgTraffic cache QbufThe initial value of the zero-flow oscillating flow filtering is 0, and the zero-flow oscillating flow filtering comprises the following steps:
1042, judging whether the current instantaneous flow Q is 0, and judging the flow Q at the previous moment1Whether or not it is 0;
Preferably, in step 1041, if the absolute value of the current instantaneous flow Q is greater than or equal to the preset flow threshold, it is determined that the flow cache Q is cachedbufWhether or not it is greater than 0 and flow rate compensation flag FgIf the current instantaneous flow Q is 1, if so, the compensated current instantaneous flow Q is equal to the current instantaneous flow Q + the flow cache Q before compensationbufAnd the flow rate compensation flag F is setgTraffic cache QbufAnd (6) clearing.
Preferably, the initial sampling time interval t in step 101 is1Is 2 s.
Compared with the prior art, the invention has the beneficial effects that:
1. the zero-flow oscillating flow can be effectively filtered, the economic loss brought to users and the trouble brought to users and suppliers by the zero-flow oscillating flow are reduced, meanwhile, the normal flow and the functions of the meter are not influenced, and the defects existing in the zero-flow point oscillating flow method solved by improving the initial flow of the electronic meter in the current market are overcome.
2. The zero-flow oscillation flow filtering only filters the flow smaller than the preset flow threshold value, the probability that the correct flow is filtered is reduced, the running efficiency of a program can be improved, the probability that the wrong filtering occurs is reduced, the metering accuracy is improved, and the consumption of resources during the running of the program is reduced. Through oscillating flow filtering to zero flow, the problems of multiple metering, error display and the like caused by the oscillating flow near the zero flow during metering of a meter can be obviously reduced, so that the loss of a user and the contradiction between a supplier and the user are reduced. Zero flow vibrates a class filtering, to satisfying the filtering compensation condition after, buffer memory with current flow, later carry out flow compensation again, can not influence the measurement accuracy, realize vibrating a filterable effect again simultaneously.
3. The preset flow threshold of the zero-flow oscillation filtering can also be set to be larger than the minimum flow Q of the meterminTo increase the filtering threshold to filter out more oscillating flows.
4. The historical reference flow of the oscillation filtering can be more than 4, namely N can be more than 3, the more the number of the reference historical flow is, the truer the reflected condition is, and the better the filtering effect is.
Drawings
FIG. 1 is a flow chart of an oscillatory flow filtering method for an electronic meter at a zero flow point according to the present invention;
fig. 2 is another flow chart of the oscillating flow filtering method for an electronic meter at a zero flow point according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, an oscillatory flow filtering method for an electronic meter at a zero flow point includes the following steps:
103, recording the current instantaneous flow Q and the flow Q obtained by sampling N times before the current instantaneous flow Q1、Q2、…、QNWherein N is an integer greater than or equal to 2;
and 104, judging whether the absolute value of the current instantaneous flow Q is smaller than a preset flow threshold value or not, and if the absolute value of the current instantaneous flow Q is smaller than the preset flow threshold value, carrying out zero-flow oscillating flow filtering.
The invention constructs a zero-flow filter, acquires flow information when a meter is in a normal working mode state, then passes the acquired flow through the zero-flow filter, and the flow passing through the filter is used for instantaneous flow display and cumulant measurement. Here, the embodiment of the present invention is exemplified by a gas meter, but the present invention is also applicable to other meters such as a water meter.
At the beginning, the reference flow buffer of the zero flow filter is cleared, and a flow compensation mark F is setgTraffic cache QbufAll initial values of (2) are 0.
Here, the flow rate QsThe electronic sensor module of by the strapping table gathers and obtains, the electronic sensor module is ultrasonic wave module or hot type module, and two kinds of modules are connected through the main control chip MCU of UART serial ports, IIC bus and strapping table respectively, and MCU sends the acquisition command and gives the module, lets the module carry out flow acquisition to flow information when gathering returns for MCU, and MCU carries out relevant calculation and obtains velocity of flow Qs。
The initial sampling time interval t in said step 1011Can be set to be 2s or adjusted according to actual needs.
Due to the obtained flow rate QsIt is a real-time value, and considering the measurement error of the sensor itself, a start flow judgment is needed in step 102, the flow in the start flow range is set to 0 and becomes zero flow, and after the start flow judgment, a flow value Q is obtained and sent to the zero flow filter for zero flow vibration filtering.
Here, the flow rate Q is judgedsThe method of whether less than the meter's pick-up flow may be:
if it is
Or
Then the flow rate QsLess than the start flow of the meter, wherein QminThe minimum metering flow of the effective range of the meter.
In step 103, the number of the historical reference flows of the oscillation filtering may be generally selected to be 3, that is, N is 3; may be less than 3, such as N being 2; it may also be greater than or equal to 4, i.e. N may be greater than 3. The more the number of the reference historical flow is, the more real the reflected condition is, and the better the filtering effect is.
In step 104, the preset flow threshold may be a minimum metering flow Q of the effective range of the metermin. Because the zero flow filtering only filters the flow smaller than the preset flow threshold, the flow larger than the preset flow threshold will neutralize the influence of the oscillation flow due to the flow fluctuation of the flow. And if the absolute value of the current instantaneous flow Q is greater than or equal to the preset flow threshold, judging whether the current instantaneous flow needs to be compensated, and if so, performing flow compensation.
Here, the preset flow threshold for zero flow oscillation filtering may also be set to be greater than the minimum metered flow Q of the meter's effective rangeminTo increase the filtering threshold to filter out more oscillating flows.
As shown in fig. 2, N historical reference flows, i.e. the flow Q obtained by sampling N times before the current instantaneous flow Q, are selected1、Q2、…、QNThe zero-flow oscillating flow filtering may include the following steps:
1042, judging whether the current instantaneous flow Q is 0, and judging the flow Q at the previous moment1Whether or not it is 0. The current instantaneous flow rate Q is equal to 0 and the previous moment flow rate Q is used1Judging whether the value is 0 or not, and performing classification discussion of four conditions respectivelyStep 1043a, step 1043b, step 1043c, and step 1043 d.
Here, the historical reference flow of the oscillation filtering can be generally selected to be 3, that is, the historical reference flow is Q1、Q2、Q3At this time, it is necessary to determine whether or not both the negative flow rate and the positive flow rate exist in the last four flow rates.
And 1045, judging whether the latest N flows have negative flows and positive flows at the same time, if so, turning to 1046, and otherwise, returning to 101. Abandoning one of the historical reference flows which is farthest away from the current instantaneous flow Q, checking the direction of the nearest N-time flow together with the current instantaneous flow Q and the historical reference flows of other N-1 oscillation filtering, and judging whether negative flow and positive flow exist at the same time.
The zero-flow oscillation flow filtering only filters the flow smaller than the preset flow threshold value, the probability that the correct flow is filtered is reduced, the running efficiency of a program can be improved, the probability that the wrong filtering occurs is reduced, the metering accuracy is improved, and the consumption of resources during the running of the program is reduced.
After the flow passes through the zero flow filter, the flow meeting the conditions is stored firstly, does not participate in instantaneous flow display and cumulant calculation temporarily, and can compensate the flow when the flow does not meet the characteristics of the oscillating flow next time, wherein the compensation mode is to cache the historical flow data QbufAdding the current flow Q into the current flow Q to calculate cumulant together, and after compensation, the current instantaneous flow Q is equal to the current instantaneous flow Q + the flow cache Q before compensationbuf。
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. An oscillating flow filtering method for an electronic meter at a zero flow point is characterized by comprising the following steps:
step 101, every initial sampling time interval t1The flow of the meter is collected once to obtain real-time flow Qs；
Step 102, judging the flow QsIf the current instantaneous flow Q of the meter is not equal to Q, the current instantaneous flow Q of the meter is equal to 0s；
103, recording the current instantaneous flow Q and the flow Q obtained by sampling N times before the current instantaneous flow Q1、Q2、…、QNWherein N is an integer greater than or equal to 2;
and 104, judging whether the absolute value of the current instantaneous flow Q is smaller than a preset flow threshold value or not, and if the absolute value of the current instantaneous flow Q is smaller than the preset flow threshold value, carrying out zero-flow oscillating flow filtering.
2. The method as claimed in claim 1, wherein the step 102 is to determine the flow QsThe method for judging whether the flow is smaller than the starting flow of the meter is as follows:
if it is
Or
Then the flow rate QsLess than the start flow of the meter, wherein QminThe minimum metering flow of the effective range of the meter.
3. The electronic meter of claim 2 at zero flow pointThe oscillating flow filtering method of (1), wherein said flow rate QsThe electronic sensor module is an ultrasonic module or a thermal module.
4. The method as claimed in claim 1, wherein in the step 104, the preset flow threshold is greater than or equal to the minimum metering flow Q of the effective range of the metermin。
5. The oscillating flow filtering method of claim 4, wherein in the step 104, if the absolute value of the current instantaneous flow Q is greater than or equal to the preset flow threshold, it is determined whether the current instantaneous flow Q needs to be compensated, and if so, the flow compensation is performed.
6. The oscillatory flow filtering method for electronic meter at zero flow point as claimed in any one of claims 1 to 5, wherein a flow compensation flag F is setgTraffic cache QbufThe initial value of the zero-flow oscillating flow filtering is 0, and the zero-flow oscillating flow filtering comprises the following steps:
step 1041, determining whether the absolute value of the current instantaneous flow Q is smaller than a preset flow threshold, if the absolute value of the current instantaneous flow Q is smaller than the preset flow threshold, entering step 1042;
1042, judging whether the current instantaneous flow Q is 0, and judging the flow Q at the previous moment1Whether or not it is 0;
step 1043a, if the current instantaneous flow Q is equal to 0, the previous moment flow Q1If 0, clear the flow compensation flag FgTraffic cache QbufSkipping to step 1044;
step 1043b, if the current instantaneous flow Q is equal to 0, the previous moment flow Q1Not equal to 0, judging the flow compensation mark FgIf the value is 1, if not, directly jumping to the step 1044, if yes, clearing the flow compensation mark FgTraffic cache QbufThen go to step 1044;
step 1043c, if the current instantaneous traffic Q is not equal to 0, the traffic Q of the previous time1If 0, set flow buffer QbufSetting a flow compensation flag F as QgResetting the current instantaneous flow Q as 1, and going to step 1044;
step 1043d, if the current instantaneous traffic Q ≠ 0, the traffic Q at the previous time1Not equal to 0, judging the flow compensation mark FgIf not, directly jumping to step 1044, if yes, then the current instantaneous flow Q ═ Q + QbufFlow compensation flag FgTraffic cache QbufAfter zero clearing, skipping to step 1044;
step 1044 of judging whether the latest N +1 flows have negative flows and positive flows at the same time, if so, turning to step 1045, otherwise, returning to step 101;
step 1045, judging whether the latest N flows have negative flows and positive flows at the same time, if yes, turning to step 1046, otherwise, returning to step 101;
step 1046, mark F of flow compensationgTraffic cache QbufAnd clearing the current flow Q and returning to the step 101.
7. The method as claimed in claim 6, wherein in the step 1041, if the absolute value of the current instantaneous flow Q is greater than or equal to the preset flow threshold, the flow cache Q is determinedbufWhether or not it is greater than 0 and flow rate compensation flag FgIf the current instantaneous flow rate is 1, if so, the current instantaneous flow rate Q is Q + QbufAnd the flow rate compensation flag F is setgTraffic cache QbufAnd (6) clearing.
8. The method as claimed in any one of claims 1 to 5, wherein the initial sampling time interval t in step 101 is a zero flow point1Is 2 s.
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