CN111998918B - Error correction method, error correction device and flow sensing system - Google Patents
Error correction method, error correction device and flow sensing system Download PDFInfo
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- CN111998918B CN111998918B CN201910446056.2A CN201910446056A CN111998918B CN 111998918 B CN111998918 B CN 111998918B CN 201910446056 A CN201910446056 A CN 201910446056A CN 111998918 B CN111998918 B CN 111998918B
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Abstract
The invention relates to the technical field of intelligent meter measurement, and provides an error correction method and an error correction device for a flow sensor device and a flow sensor system, wherein the flow sensor system to be corrected comprises one or more flow sensor devices; the error correction method comprises the following steps: acquiring original flow data of each flow sensor device in a flow sensing system to be corrected; setting an error reference standard; and acquiring the measurement error of each flow sensor device in the flow sensor system to be corrected based on the error reference standard, and correcting the corresponding original flow data based on the measurement error of each flow sensor device. By the error correction method, equal-error flow data or no-error flow data can be obtained, corrected flow data of all branches in the flow sensing system to be corrected can be rapidly obtained, and the problem of inaccurate flow data caused by errors of the current flow sensor device can be effectively solved.
Description
[ field of technology ]
The present invention relates to the field of smart meter measurement technologies, and in particular, to an error correction method, an error correction device, and a flow sensing system.
[ background Art ]
The flow sensor is used for measuring the bypass flow of the air supply or water supply or oil supply system or the heating system. For example, water, gas, oil or heat meters are common flow sensors. In reality, there are many problems with flow sensors: the flow sensor has errors, and the errors need to be detected; the error detection of the flow sensor needs special equipment and personnel, and vacuum detection (measures such as water cut-off and gas cut-off) is needed, and the comprehensive error detection is a work with huge time consumption and resources due to the huge number of the flow sensors. Moreover, the error of the flow sensor changes along with the service life, so that the workload of error detection of the flow sensor and the consumption of human property resources are increased.
Currently, with the development of computers, networks and big data technologies, much work is done on the global research of flow sensor technology and flow metering technology. The main research is focused on: the intelligent flowmeter is researched, and the aim is to improve the measurement accuracy and reduce the data error; and (3) researching an intelligent flowmeter calibration assembly line technology, and accelerating the error detection speed of a flowmeter laboratory.
The problems that errors exist in a flow sensor in reality and detection errors are difficult still cannot be solved by the scheme. In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art.
[ invention ]
The invention aims to solve the problems of errors and difficult error detection of a flow sensor device.
The invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for error correction of a flow sensor device, a flow sensor system to be corrected comprising one or more flow sensor devices;
the error correction method comprises the following steps:
acquiring original flow data of each flow sensor device in the flow sensing system to be corrected;
setting an error reference standard;
and acquiring the measurement error of each flow sensor device in the flow sensing system to be corrected based on the error reference standard, and correcting the corresponding original flow data based on the measurement error of each flow sensor device.
Preferably, obtaining a measurement error of each flow sensor device in the flow sensing system to be corrected based on the error reference standard, and correcting the corresponding raw flow data based on the measurement error of each flow sensor device includes:
acquiring a reference measurement error of each flow sensor device in the flow sensor system to be corrected based on the error reference standard;
And correcting the corresponding original flow data according to the reference measurement error of each flow sensor device to obtain compensated flow data of each flow sensor device, wherein the error value of the compensated flow data of each flow sensor device is equal to the systematic error of the flow sensing system to be corrected.
Preferably, obtaining the measurement error of each flow sensor device in the flow sensing system to be corrected based on the error reference standard, and correcting the corresponding raw flow data based on the measurement error of each flow sensor device further includes:
acquiring a system error of the flow sensing system to be corrected;
and correcting the compensated flow data of each flow sensor device according to the systematic error of the flow sensing system to be corrected to obtain error-free flow data of each flow sensor device.
Preferably, acquiring the system error of the flow sensing system to be corrected includes:
optionally a flow sensor device in the flow sensing system to be calibrated;
removing the selected flow sensor device and measuring the actual measurement error of the selected flow sensor device;
Subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
Preferably, acquiring the system error of the flow sensing system to be corrected includes:
a flow sensor device with known error is connected in series on a branch of any flow sensor device in the flow sensor system to be corrected;
during the running process of the flow sensing system to be corrected, respectively reading the flow data of the flow sensor device which is connected in series and the flow data of the flow sensor device on the branch, and determining the actual measurement error of the selected flow sensor device;
subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
Preferably, the flow sensing system to be corrected has an intersection relationship or a subset relationship with the flow sensing system with known system errors;
the obtaining the system error of the flow sensing system to be corrected comprises the following steps:
determining a target flow sensor device in the flow sensing system to be corrected, wherein the target flow sensor device is the same as the flow sensing system belonging to the known system error;
Calculating an actual measurement error of the target flow sensor device by a flow sensing system based on the known system error;
and subtracting the reference measurement error of the target flow sensor device from the actual measurement error of the target flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
Preferably, the setting error reference criteria include:
in the flow sensing system to be corrected, any flow sensor device is selected as an error reference standard;
and designating the measurement error of the error reference standard as a designated value, wherein the difference value between the error designated value of the error reference standard and the true error value of the error reference standard is equal to the systematic error of the flow sensing system to be corrected.
Preferably, the setting error reference criteria include:
selecting a flow sensor device from the flow sensor systems to be corrected as an error reference standard, wherein the selected flow sensor device is the same as the flow sensor system belonging to another known system error;
and determining the measurement error of the error reference standard according to the flow sensing system with the known system error.
Preferably, the acquiring the measurement error of each flow sensor device based on the error reference standard includes:
And establishing an energy conservation relation according to a formula I, wherein the formula I specifically comprises the following steps:
wherein W is i Flow representing the ith incoming lineRaw flow data, X, of a quantity sensor device i Indicating a measurement error of the flow sensor device of the ith incoming line; w (W) j Raw flow data, X, representing a flow sensor device for a jth line j Indicating a measurement error of the flow sensor device of the j-th wire;
substituting the original flow data corresponding to the error reference standard, the measurement errors corresponding to the error reference standard and the original flow data of other flow sensor devices into a formula I to obtain the measurement errors of each flow sensor device.
Preferably, the flow sensor device is a water meter, gas meter, heat meter or petroleum meter.
Preferably, the flow sensor devices are sequentially selected from the flow sensor system to be corrected, the measurement errors of the selected flow sensor devices are set to be specified values, and the measurement errors of other flow sensor devices are calculated;
determining the qualification rate of the flow sensor device in the flow sensor system to be corrected according to the relation between the measurement error of the flow sensor device and the standard measurement error;
And when the qualification rate is larger than a preset qualification rate threshold value, the corresponding selected flow sensor device is an error reference standard.
Preferably, the number of error reference standards is two, the error reference standards including a first error reference standard and a second error reference standard;
the setting error reference standard further includes:
setting a weight value corresponding to the first error reference standard as a first weight value, and setting a weight value corresponding to the second error reference standard as a second weight value;
calculating a first measurement error value of other flow sensor devices according to the first error reference standard;
calculating a second measurement error value of the other flow sensor device according to the second error reference standard;
and determining measurement errors of other flow sensor devices according to the first measurement error value, the first weighting value, the second measurement error value and the second weighting value.
Preferably, the setting error reference criteria include:
if no flow sensor device capable of meeting the qualification rate greater than a preset qualification rate threshold exists in the flow sensing system to be corrected, searching a reference flow sensing system capable of covering the flow sensing system to be corrected;
And sequentially selecting flow sensor devices in the reference flow sensing system until the flow sensor devices which can meet the condition that the qualification rate is larger than a preset qualification rate threshold value are found, and setting the flow sensor devices as error reference standards.
In a second aspect, the present invention further provides an error correction device for implementing the error correction method according to the first aspect, where the error correction device includes:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being programmed to perform the error correction method of the first aspect.
In a third aspect, the present invention also provides a flow sensing system comprising one or more flow sensor devices, one or more error correction devices as described in the second aspect;
the error correction device is used for calculating the measurement error of each flow sensor device so as to correct the original flow data.
In a fourth aspect, the present invention also provides a non-volatile computer storage medium storing computer-executable instructions for execution by one or more processors to perform the error correction method of the first aspect.
The invention provides an error correction method of a flow sensor device, which comprises the following steps: acquiring original flow data of each flow sensor device in a flow sensing system to be corrected; setting an error reference standard; and acquiring the measurement error of each flow sensor device in the flow sensor system to be corrected based on the error reference standard, and correcting the corresponding original flow data based on the measurement error of each flow sensor device. By the error correction method, the original flow data of each flow sensor device is corrected, equal-error flow data or no-error flow data can be obtained, corrected flow data of all branches in the flow sensor system to be corrected can be rapidly obtained, and the error process of measuring each flow sensor device is avoided. By adopting the error correction method, the flow data can be accurately measured, and the problem of inaccurate flow data caused by errors of the current flow sensor device can be effectively solved.
Furthermore, the error correction method can also be used for carrying out real-time error monitoring or automatic detection on the flow sensor device, and can solve the technical problem of difficult error detection of the traditional flow sensor device.
[ description of the drawings ]
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments of the present invention will be briefly described below. It is evident that the drawings described below are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic flow chart of an error correction method of a flow sensor device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first implementation of step 11 in FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a flow sensing system to be calibrated according to an embodiment of the present invention;
FIG. 4 is a flow chart of a second implementation of step 11 in FIG. 1 provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a flow sensor system to be corrected and a flow sensor system with a known system error according to an embodiment of the present invention;
FIG. 6 is a flow chart of one implementation of step 11 of FIG. 1 provided by an embodiment of the present invention;
FIG. 7 is a flow chart of a first implementation of step 121 of FIG. 6 according to an embodiment of the present invention;
FIG. 8 is a flow chart of a second implementation of step 121 of FIG. 6 according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a flow sensing system to be corrected and another known system error according to an embodiment of the present invention;
FIG. 10 is a flow chart of a third implementation of step 121 of FIG. 6 according to an embodiment of the present invention;
FIG. 11 is a schematic illustration of a summary and sub-summary relationship of a water supply system provided by an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an error correction device according to an embodiment of the present invention.
[ detailed description ] of the invention
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to facilitate understanding of the technical solution of the present invention, the present invention will be specifically explained first with respect to terms appearing hereinafter.
The flow sensor device according to the present invention refers to a device for measuring a flow rate flowing through one branch, and includes various types according to different usage scenarios, for example, the flow sensor may be a water meter for measuring a flow rate of water, or a gas meter for measuring a flow rate of natural gas or gas, or a petroleum meter for measuring a petroleum amount, or a heat meter for measuring heat. The raw flow data measured by the flow sensor device of the present invention is subject to measurement errors.
The error reference standard referred to in the present invention refers to a etalon or data as an error reference standard. Whether using physical experimentation or mathematical calculations, the measurement of any one quantity is relative to a reference datum; any one measurement error is detected relative to an error reference standard, and the etalon or data for the error reference standard is referred to as the error reference standard. For example, the "standard table" in the experiments of the error check of the conventional flow meter is an error reference standard. When calculating an error using the flow data, the data error of the flow sensor used as the reference datum is the error reference standard calculated at this time.
The constant error data according to the present invention is: for any one flow sensor device with errors, after the measurement errors of the flow sensor device are detected, the detected error values are used for carrying out error correction processing on the original flow data (the original flow data is provided with errors) of the flow sensor device, and the errors of all the obtained corrected flow data are equal to the errors brought by a method for detecting the errors. These corrected flow data are referred to as "equierror" data. The 'equal error' is an error brought by an error measurement method, is equal to an error value of an error reference standard, and is also a system error of the flow sensing system. Under the concept of error, after error correction processing, the measurement error of each flow data of the flow sensing system is the same.
The error-free data according to the invention are: for any isoerror data, when its "isoerror" is measured and corrected, the resulting data is error-free data. In view of the fact that it is theoretically impossible to have absolute error-free data, it is possible in other words that the error-free data is data with no errors or negligible errors.
The flow sensing system according to the present invention is: all flow sensor devices used to measure the flow of all branches in a flow sensing system are considered a set or complete system. The flow of all incoming lines and the flow of all outgoing lines of the system are equal, and the relative energy conservation law (the relative energy conservation law is called because of factors such as leakage and the like) is met. One of the characteristics of the flow sensing system is that its measurement object is all branches of a complete system; the second characteristic of the flow sensing system is that all flow data measured by the flow sensing system are equal error data or no error data. Based on the error correction method, the flow sensing system can output error-free flow data.
Example 1:
in order to solve the problems of errors and difficult error detection of the flow sensor device, the embodiment provides an error correction method of the flow sensor device, by which the original flow data of each flow sensor device is corrected, so that equal-error flow data or no-error flow data can be obtained, and corrected flow data of all branches in the flow sensor system to be corrected can be quickly obtained.
Furthermore, the existing flow meter error checking method is replaced by the flow sensing system, so that the working efficiency can be improved, and the high cost caused by flow meter calibration and flow meter rotation can be reduced.
In this embodiment, the flow sensing system to be corrected includes one or more flow sensor devices, where the error correction method of this embodiment is implemented based on the principle of conservation of energy, and the flow sensing system to be corrected satisfies the relative principle of conservation of energy.
Wherein one or more flow sensor devices in the flow sensing system to be corrected conform to the correct network topology. The network topology relationship refers to a connection and a attribution relationship between a flow sensor device located at an incoming line side and a flow sensor device located at an outgoing line side, wherein the concepts of the flow sensor device at the incoming line side and the flow sensor device at the outgoing line side are relative terms, and the relationship is a total flow table and a sub flow table.
Next, one implementation of the error correction method of the flow sensor device of the present embodiment is described with reference to fig. 1. The error correction method comprises the following steps:
step 10: and acquiring the original flow data of each flow sensor device in the flow sensing system to be corrected.
In this embodiment, the raw flow data of the individual flow sensor device may be automatically collected by the concentrator and transferred to the database server. Wherein the raw flow data is subject to errors due to errors in the flow sensor device.
Under the actual application scene, according to people's habit of using water, gas, heat or refueling, can divide different periods to the original flow data of time-sharing collection. For example, for the water supply field, the original flow data of each flow sensor device can be collected in the early morning, and in the flow sensor system to be corrected, the original flow data of part of the flow sensor devices can be zero, so that the data volume can be reduced, and the difficulty of data processing can be reduced. In this embodiment, after determining the actual measurement error of a part of the flow sensor devices, data collection may be performed again, for example, the raw flow data of each flow sensor device is collected during the daytime, so as to determine the raw flow data of the remaining flow sensor devices. Since the actual measurement errors of a portion of the flow sensor device have been determined in the foregoing process, the data throughput can be greatly reduced and the rate of error correction can be increased. In the air supply field, the oil supply field or the heat supply field, under the condition that the original flow data of the flow sensor device is zero in a certain period of time, the data can be acquired in the time-sharing mode, and error correction is performed step by step so as to improve the operation efficiency.
Step 11: an error reference standard is set.
In this embodiment, in order to correct the original flow data, an error reference standard is set first, and then the original flow data is corrected based on the error reference standard, so as to eliminate errors and obtain more accurate flow data. There are at least the following ways of setting the reference standard with respect to the error.
Mode one: error reference criteria are set using the method shown in fig. 2.
Step 1111: in the flow sensing system to be corrected, any flow sensor device is selected as an error reference standard.
Referring to fig. 3, the flow sensing system to be corrected includes n flow sensor devices, where the flow sensor device 0 is used for measuring incoming line flow in the total table of the flow sensing system to be corrected, the flow sensor devices 1 to n-1 are sub-tables for measuring branching flow, the flow sensor device 0 and the flow sensor devices 1 to n-1 form a correct network topology relationship, and regarding whether the network topology relationship is correct or not, it can be determined according to a correlation method.
A flow sensor device may be selected from any of the flow sensor devices 0 to n-1 as the error reference standard.
Step 1112: and designating the measurement error of the error reference standard as a designated value, wherein the difference value between the error designated value of the error reference standard and the true error value of the error reference standard is equal to the systematic error of the flow sensing system to be corrected.
In an alternative embodiment, a numerical value is self-specified as an error specified value according to actual conditions, or a numerical value can be selected from a standard measurement error interval as the specified value. The specified value may be in and out of the true measurement error of the flow sensor device and may not truly reflect the measurement error of the flow sensor device. And the difference value between the error appointed value of the error reference standard and the true error value of the error appointed value is equal to the system error of the flow sensing system to be corrected. This is explained further below.
Mode two: error reference criteria are set using the method shown in fig. 4.
Step 1121: in the flow sensor system to be corrected, a flow sensor device is selected as an error reference standard, wherein the selected flow sensor device is identical to the flow sensor system belonging to another known system error.
In connection with fig. 5, the flow sensor device n-1 belongs to the flow sensing system to be corrected, the flow sensor device n-1 also belongs to another flow sensing system with a known system error, and the flow sensor device n-1 can be selected as an error reference standard.
Step 1122: and determining the measurement error of the error reference standard according to the flow sensing system with the known system error.
In this embodiment, the measurement error of the error reference standard may be determined according to the flow sensing system with known system error, and the measurement error determined according to this method is a known value, and the known value can reflect the true error value of the flow sensor device n-1 (error reference standard) without considering the calculation error or the detection error.
In the second mode, when the error reference standard is set, the measurement error of each flow sensor device obtained according to the following step 12 is the actual measurement error of each flow sensor device, and the corresponding raw data is corrected by the actual measurement error, so that error-free flow data can be obtained.
In other ways, a standard table may also be introduced into the flow sensing system to be corrected, which standard table serves as an error reference standard. The setting method of the error reference standard is selected according to the actual situation, and is not particularly limited here.
Step 12: and acquiring the measurement error of each flow sensor device in the flow sensing system to be corrected based on the error reference standard, and correcting the corresponding original flow data based on the measurement error of each flow sensor device.
In the embodiment of the present invention, in order to improve the accuracy of calculation, a missing parameter variable may also be used, but in order to consider the indirection of the description, the missing parameter variable is not introduced in the following detailed description process. Specifically, the measurement error of each flow sensor device can be obtained by the following method.
For a flow sensing system having m incoming lines and n outgoing lines, the flow sensing system comprises at least (m+n) flow sensor devices, and the flow passing through the flow sensing system complies with the law of conservation of relative energy, namely: input traffic sum = user consumption traffic sum.
In this embodiment, an energy conservation relation is established according to a formula one, wherein the formula one is specifically:
wherein W is i Raw flow data, X, representing flow sensor device of the ith incoming line i Indicating a measurement error of the flow sensor device of the ith incoming line; w (W) j Raw flow data, X, representing a flow sensor device for a jth line j Indicating the measurement error of the flow sensor device of the j-th line.
And substituting the original flow data corresponding to the error reference standard, the measurement errors corresponding to the error reference standard and the original flow data of other flow sensor devices into a formula I to obtain the measurement errors of each flow sensor device.
After each flow sensor device is compensated with a reference measurement error, the resulting error between the compensated flow data and the actual flow data is equal to the systematic error (i.e., the equivalent error) of the flow sensing system. That is, (m+n) flow data at any one time point given by the flow sensing system will have the same error. The systematic error is an equal error, is brought by an error measurement method, and is the error of an error reference standard in the error measurement method. This means that the error value of the remaining (m+n-1) data is known by detecting the equi-error of one data using any method, thereby obtaining the true value of the flow value (error-free data).
However, when the setting modes of the error reference standards are different, there is also a difference in the data correction modes corresponding to step 12.
When the error reference standard is set in the second mode or the standard table is directly referred to as the error reference standard, the measurement error of each flow sensor device in the flow sensor system to be corrected is obtained based on the error reference standard, the measurement error is the actual measurement error of each flow sensor device, and then the corresponding original flow data is corrected based on the actual measurement error of each flow sensor device, so as to obtain error-free data.
When the error reference standard is set in the foregoing manner, the measurement error of each flow sensor device in the flow sensor system to be corrected is obtained based on the error reference standard, where the measurement error is a reference measurement error of each flow sensor device, and may not be equal to an actual measurement error. And correcting the original flow data according to the reference measurement errors to obtain compensated flow data, wherein the compensated flow data corresponding to each flow sensor device is equal error data aiming at the flow sensing system to be corrected, and the error-free data can be obtained after the equal errors are required to be eliminated. The raw flow data may be corrected in particular as follows. Referring to fig. 6, step 12 specifically includes the following sub-steps:
Step 121: and acquiring a reference measurement error of each flow sensor device in the flow sensor system to be corrected based on the error reference standard.
When the error reference standard is one flow sensor device in the flow sensor system to be corrected, each flow sensor device refers to the other flow sensor device excluding the error reference standard. When introducing an external flow sensor device into the flow sensing system to be corrected is employed, each of the aforementioned flow sensor devices refers to all of the flow sensor devices included in the flow sensing system to be corrected, and no external flow sensor device is included.
Step 122: and correcting the corresponding original flow data according to the reference measurement error of each flow sensor device to obtain compensated flow data of each flow sensor device, wherein the error value of the compensated flow data of each flow sensor device is equal to the systematic error of the flow sensing system to be corrected.
In this embodiment, according to the equal error theory, the corresponding raw flow data is corrected according to the reference measurement error of each flow sensor device, so as to obtain compensated flow data of each flow sensor device, where the error value of the compensated flow data of each flow sensor device is equal to the systematic error of the flow sensing system to be corrected.
Step 123: and acquiring the system error of the flow sensing system to be corrected.
In order to obtain error-free flow data, a systematic error of the flow sensing system to be corrected is acquired, wherein the systematic error of the flow sensing system to be corrected is equal to a difference between an error specification value of an error reference standard and a self-measurement error value (actual measurement error value).
Due to the equal error theory, the actual measurement error of each flow sensor device minus the reference measurement error thereof corresponds to the systematic error of the flow sensing system to be corrected. Therefore, a flow sensor device can be arbitrarily selected to acquire the actual measurement error thereof so as to acquire the system error of the flow sensor system to be corrected, thereby correcting the compensated flow data of other flow sensor devices and acquiring error-free flow data.
Step 124: and correcting the compensated flow data of each flow sensor device according to the systematic error of the flow sensing system to be corrected to obtain error-free flow data of each flow sensor device.
In this embodiment, after the system error of the flow sensor system to be corrected is obtained, the compensated flow data of each flow sensor device is corrected according to the system error of the flow sensor system to be corrected, so as to obtain error-free flow data of each flow sensor device, where the error-free flow data is data that has no error in theory or data that has negligible error.
In step 123, there are various optional ways to obtain the systematic error of the flow sensing system to be corrected, specifically as follows:
mode one: the method shown in fig. 7 is adopted to obtain the systematic error of the flow sensing system to be corrected.
Step 1231a: optionally, a flow sensor device is provided in the flow sensing system to be calibrated.
In the present embodiment, a flow sensor device may be arbitrarily selected, or a flow sensor device may be selected as an error reference standard, and is not particularly limited herein.
Step 1232a: the selected flow sensor device is removed and the actual measurement error of the selected flow sensor device is measured.
In performing the measurement, the selected flow sensor device is removed and sent to a laboratory where the error is detected using conventional methods to obtain the actual measurement error for the selected flow sensor device. The actual measurement error may also be an error relative to the actual situation, but the error is small and negligible.
Step 1233a: subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
Mode two: the method shown in fig. 8 is adopted to obtain the systematic error of the flow sensing system to be corrected.
Step 1231b: and connecting a flow sensor device with a known error in series on a branch of any flow sensor device in the flow sensor system to be corrected.
In this embodiment, the branch where the flow sensor device is located may be selected arbitrarily, or the branch where the flow sensor device is located may be selected as the error reference standard, which is not particularly limited herein.
The flow sensor device with known error can be understood as a standard meter, and the actual measurement error of the flow sensor device on the corresponding branch is obtained through the standard meter.
Because of water or air accumulation in the pipeline, the strung flow sensor device is arranged adjacent to the flow sensor on the branch for ensuring the accuracy of the test.
Step 1232b: and respectively reading the flow data of the flow sensor device which is connected in series and the flow data of the flow sensor device on the branch in the running process of the flow sensor system to be corrected, and determining the actual measurement error of the selected flow sensor device.
Step 1233b: subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
Mode three: as shown in fig. 5, the flow sensing system to be corrected and the flow sensing system with known system errors have an intersection relationship, and the flow sensor device n-1 belongs to the flow sensing system to be corrected and the flow sensing system with known system errors; as shown in fig. 9, the flow sensing system to be corrected belongs to a flow sensing system with a known system error, and the flow sensing system to be corrected is a subset of the flow sensing systems with the known system error, and the two are in a subset relationship.
The method shown in fig. 10 is adopted to obtain the systematic error of the flow sensing system to be corrected.
Step 1231c: in the flow sensing system to be corrected, a target flow sensor device is determined, wherein the target flow sensor device is identical to the flow sensing system belonging to the known system error.
Step 1232c: and calculating the actual measurement error of the target flow sensor device by the flow sensing system based on the known system error.
Step 1233c: and subtracting the reference measurement error of the target flow sensor device from the actual measurement error of the target flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
In the relation diagram shown in fig. 5, the flow sensor device n-1 may be used as a target flow sensor device, and the actual measurement error of the flow sensor device n-1 may be obtained by a flow sensor system with a known system error, thereby obtaining the system error of the flow sensor system to be corrected.
In the relationship diagram shown in fig. 9, the flow sensor device 0 in the flow sensing system to be corrected may be used as the target flow sensor device, and the actual measurement error of the flow sensor device 0 may be obtained by the flow sensing system with a known system error, thereby obtaining the system error of the flow sensing system to be corrected.
Example 2:
here, a specific case is described: in an industrial park, a water supply system comprises 1 flow sensor device for measuring incoming flow of the water supply system, and 6 flow sensor devices for respectively measuring corresponding outgoing flow.
As shown in fig. 11, the flow sensor device M1' is disposed on the incoming line side of the water supply system and is a summary table for measuring incoming line flow data, and the flow sensor devices M1 to M6 are disposed on the outgoing line side of the service consumer and are branch tables for measuring outgoing line flow data.
For equation one in example 1, taking m=1, n=6, the following equation is obtained:
for the foregoing equation, it must be assumed that the measurement error of the flow sensor device on one leg (whether it is an incoming or outgoing line) is a known value. Otherwise, the equation is a homogeneous equation, which is an equation without a unique solution.
In an alternative implementation, given that the error value of the flow sensor device of a branch is a specified value (the flow sensor device is the error reference standard), the difference between the specified error value of the flow sensor device and the error true value of the flow sensor device constitutes the error. And solving the error values of other individual flow sensor devices in the equation to obtain a reference measurement error of each flow sensor device, compensating the original flow data according to the reference measurement error to obtain compensated flow data (equal error flow data), as follows:
W′ i ＝W i (1+X i )
W′ j ＝W j (1+X j )
wherein W' i ，W′ j Representing flow data of the ith incoming line and the jth outgoing line after compensation, except for systematic errors of a flow sensing system, W' i ，W′ j Is the error data.
In this process, the compensated flow data corresponding to the flow sensing system has a common systematic error (equal error), and the equal error data is error-free data under the condition that the error designated value of the set error reference standard is assumed to be accurate.
After the equal error data is obtained, it is necessary to acquire the systematic error of the flow sensor device, and correct the equal error data to obtain error-free data.
In an actual application scenario, the actual measurement error of any one flow sensor device in the flow sensor system, such as the actual measurement error X of the ith flow sensor device, can be detected using conventional detection techniques and methods ic The following equation two can be obtained:
X′ i ＝X ic -X i
wherein X 'is' i Representing the systematic error, X, of the flow sensing system ic Representing the ith flow sensor assemblyThe actual measurement error is set; x is X i Indicating a reference measurement error of the i-th flow sensor device.
After the system error of the flow sensor system is obtained, the actual measurement error of each flow sensor device can be obtained, and then the flow data is corrected, so that error-free flow data is obtained.
In this case, the flow sensing system is installed and configured as follows: comprises 7 sets of flow sensors; the original flow data of the individual flow sensor device is automatically collected through the concentrator and transmitted to the database server. And the database server is internally provided with a mathematical model and an algorithm program of the flow sensing system, and the original flow data transmitted by the individual flow sensor device is calculated to calculate the reference measurement error of the individual flow sensor device. And in the database server, the original flow data of the individual flow sensor device is compensated according to the reference measurement error, so as to obtain equal-error flow data. And finally, acquiring the systematic error of the flow sensing system to eliminate the error and obtain error-free flow data.
In this case, the hardware of the flow sensing system is composed of an individual flow sensor device, a concentrator and a database server; the software includes communication software and error calculation compensation software. The calculation of the error of the individual flow sensor device may be done in the individual flow sensor device or in a calculation circuit installed in its components, or in a dedicated calculation device (e.g. a concentrator). Furthermore, the calculation process may be implemented by edge calculation, cloud calculation, or fog calculation, in particular.
Example 3:
for setting the error reference standard in the above embodiment 1, this embodiment also provides an alternative scheme as follows:
sequentially selecting flow sensor devices from the flow sensor system to be corrected, setting the measurement errors of the selected flow sensor devices as specified values, and calculating the measurement errors of other flow sensor devices; determining the qualification rate of the flow sensor device in the flow sensor system to be corrected according to the relation between the measurement error of the flow sensor device and the standard measurement error; and when the qualification rate is larger than a preset qualification rate threshold value, the corresponding selected flow sensor device is an error reference standard.
The error reference standard set in the mode has the possibility that the error appointed value is more approximate to the error true value, and the process of determining the system error can be avoided under special application scenes, so that the error correction efficiency is improved.
In an alternative embodiment, the number of error reference criteria is two, the error reference criteria including a first error reference criteria and a second error reference criteria; the setting error reference standard further includes: and setting the weight value corresponding to the first error reference standard as a first weight value, and setting the weight value corresponding to the second error reference standard as a second weight value, wherein the sizes of the first weight value and the second weight value can be determined according to the qualification rate corresponding to each of the first error reference standard system and the second error reference standard, and the weight value corresponding to the error reference standard with high qualification rate is relatively larger. Calculating first measurement error values of other flow sensor devices according to the first error reference standard; calculating a second measurement error value of the other flow sensor device according to the second error reference standard; and determining measurement errors of other flow sensor devices according to the first measurement error value, the first weighting value, the second measurement error value and the second weighting value.
In this embodiment, the measurement errors of other flow sensor devices are determined by adopting a weighted average manner, so that accuracy can be improved, and the flow sensor device is closer to the actual situation.
When the error reference standard is selected for the foregoing manner, there is a possibility that all flow sensor devices in the flow sensor system to be corrected cannot meet the condition that the qualification rate is greater than the preset qualification rate threshold, that is, any flow sensor device in the flow sensor system to be corrected cannot be set as the error reference standard, resulting in that the calibration process cannot be implemented. In order to solve the problem, the present embodiment is improved based on the foregoing solution, and the area range to which the error reference standard belongs is continuously extended, and in a specific application scenario, there is a larger flow sensing system than the flow sensing system to be corrected, where the larger flow sensing system covers the flow sensing system to be corrected, and for convenience of description, a larger flow sensing system that can cover the flow sensing system to be corrected and has a network topology relationship with the flow sensing system to be corrected is described as a reference flow sensing system. Error reference criteria may be selected from the reference flow sensing system to correct for the raw flow data. The specific scheme is as follows:
If no flow sensor device capable of meeting the qualification rate greater than a preset qualification rate threshold exists in the flow sensing system to be corrected, searching a reference flow sensing system capable of covering the flow sensing system to be corrected. And sequentially selecting flow sensor devices in the reference flow sensing system until the flow sensor devices which can meet the condition that the qualification rate is larger than a preset qualification rate threshold value are found, and setting the flow sensor devices as error reference standards.
In this embodiment, when the flow sensor devices in the flow sensor system to be corrected cannot be used as the error reference standard, the upstream backtracking is performed, and the screening is continuously traversed until a suitable error reference standard is found to correct the data. The method provides a better error correction method for special application scenes, and widens the application scenes of the error correction method.
After the error reference standard is determined, the flow data may be corrected in the manner of embodiment 1, and specific reference may be made to embodiment 1, which is not described herein.
Example 4:
fig. 12 is a schematic structural diagram of an error correction device according to an embodiment of the present invention. The error correction device of the present embodiment includes one or more processors 41 and a memory 42. In fig. 12, a processor 41 is taken as an example.
The processor 41 and the memory 42 may be connected by a bus or otherwise, which is illustrated in fig. 12 as a bus connection.
The memory 42, as a nonvolatile computer-readable storage medium for storing one error correction method, can be used to store a nonvolatile software program and a nonvolatile computer-executable program, such as the error correction methods in embodiments 1 to 3. The processor 41 executes the error correction method by running non-volatile software programs and instructions stored in the memory 42.
It should be noted that, because the content of information interaction and execution process between modules and units in the above-mentioned device and system is based on the same concept as the processing method embodiment of the present invention, specific content may be referred to the description in the method embodiment of the present invention, and will not be repeated here.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the embodiments may be implemented by a program that instructs associated hardware, the program may be stored on a computer readable storage medium, the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
Example 5:
the present embodiment provides a flow sensing system, which includes one or more flow sensor devices and one or more error correction devices as described in embodiment 4, wherein the error correction device is used for calculating a measurement error of each flow sensor device to correct raw flow data.
The flow sensor device is a water meter, a gas meter, a heat meter or a petroleum meter, and is provided with a corresponding metering chip and/or a communication circuit, so that data acquisition and transmission can be completed.
The error correction device is used for realizing a calculation process through edge calculation, cloud calculation or fog calculation.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (12)
1. An error correction method of a flow sensor device, characterized in that a flow sensor system to be corrected comprises one or more flow sensor devices;
the error correction method comprises the following steps:
acquiring original flow data of each flow sensor device in the flow sensing system to be corrected;
setting an error reference standard; the flow sensor devices are sequentially selected from the flow sensor system to be corrected, the measurement errors of the selected flow sensor devices are set to be specified values, and the measurement errors of other flow sensor devices are calculated; determining the qualification rate of the flow sensor device in the flow sensor system to be corrected according to the relation between the measurement error of the flow sensor device and the standard measurement error; when the qualification rate is larger than a preset qualification rate threshold value, the corresponding selected flow sensor device is an error reference standard;
and acquiring the measurement error of each flow sensor device in the flow sensing system to be corrected based on the error reference standard, and correcting the corresponding original flow data based on the measurement error of each flow sensor device.
2. The method of error correction of flow sensor devices of claim 1, wherein obtaining a measurement error for each flow sensor device in the flow sensor system to be corrected based on the error reference criteria, correcting the corresponding raw flow data based on the measurement error for each flow sensor device comprises:
Acquiring a reference measurement error of each flow sensor device in the flow sensor system to be corrected based on the error reference standard;
and correcting the corresponding original flow data according to the reference measurement error of each flow sensor device to obtain compensated flow data of each flow sensor device, wherein the error value of the compensated flow data of each flow sensor device is equal to the systematic error of the flow sensing system to be corrected.
3. The method of error correction of flow sensor devices of claim 2, wherein obtaining a measurement error for each flow sensor device in the flow sensor system to be corrected based on the error reference criteria, correcting the corresponding raw flow data based on the measurement error for each flow sensor device further comprises:
acquiring a system error of the flow sensing system to be corrected;
and correcting the compensated flow data of each flow sensor device according to the systematic error of the flow sensing system to be corrected to obtain error-free flow data of each flow sensor device.
4. The method of error correction of a flow sensor device of claim 3, wherein obtaining a systematic error of the flow sensor system to be corrected comprises:
Optionally a flow sensor device in the flow sensing system to be calibrated;
removing the selected flow sensor device and measuring the actual measurement error of the selected flow sensor device;
subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
5. The method of error correction of a flow sensor device of claim 3, wherein obtaining a systematic error of the flow sensor system to be corrected comprises:
a flow sensor device with known error is connected in series on a branch of any flow sensor device in the flow sensor system to be corrected;
during the running process of the flow sensing system to be corrected, respectively reading the flow data of the flow sensor device which is connected in series and the flow data of the flow sensor device on the branch, and determining the actual measurement error of the selected flow sensor device;
subtracting the reference measurement error of the selected flow sensor device from the actual measurement error of the selected flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
6. A method of error correction of a flow sensor device according to claim 3, characterized in that the flow sensing system to be corrected has an intersection relationship or a subset relationship with a flow sensing system of known systematic error;
the obtaining the system error of the flow sensing system to be corrected comprises the following steps:
determining a target flow sensor device in the flow sensing system to be corrected, wherein the target flow sensor device is the same as the flow sensing system belonging to the known system error;
calculating an actual measurement error of the target flow sensor device by a flow sensing system based on the known system error;
and subtracting the reference measurement error of the target flow sensor device from the actual measurement error of the target flow sensor device to obtain the systematic error of the flow sensing system to be corrected.
7. The error correction method of a flow sensor device according to any one of claims 1 to 6, wherein the setting error reference criteria includes:
in the flow sensing system to be corrected, any flow sensor device is selected as an error reference standard;
and designating the measurement error of the error reference standard as a designated value, wherein the difference value between the error designated value of the error reference standard and the true error value of the error reference standard is equal to the systematic error of the flow sensing system to be corrected.
8. The error correction method of a flow sensor device according to any one of claims 1 to 6, wherein the setting error reference criteria includes:
selecting a flow sensor device from the flow sensor systems to be corrected as an error reference standard, wherein the selected flow sensor device is the same as the flow sensor system belonging to another known system error;
and determining the measurement error of the error reference standard according to the flow sensing system with the known system error.
9. The error correction method of a flow sensor device according to any one of claims 1 to 6, wherein the obtaining a measurement error of each flow sensor device based on the error reference standard includes:
and establishing an energy conservation relation according to a formula I, wherein the formula I specifically comprises the following steps:
wherein W is i Raw flow data, X, representing flow sensor device of the ith incoming line i Indicating a measurement error of the flow sensor device of the ith incoming line; w (W) j Raw flow data, X, representing a flow sensor device for a jth line j Indicating a measurement error of the flow sensor device of the j-th wire;
substituting the original flow data corresponding to the error reference standard, the measurement errors corresponding to the error reference standard and the original flow data of other flow sensor devices into a formula I to obtain the measurement errors of each flow sensor device.
10. The method for correcting an error of a flow sensor device according to any one of claims 1 to 6, wherein the flow sensor device is a water meter, a gas meter, a heat meter, or a petroleum meter.
11. An error correction device, characterized in that the error correction device comprises:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being programmed to perform the error correction method of the flow sensor apparatus of any one of claims 1-10.
12. A flow sensing system comprising one or more flow sensor devices, one or more error correction devices of claim 11;
the error correction device is used for calculating the measurement error of each flow sensor device so as to correct the original flow data.
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