CN114353894A - Frequency stability method for improving pulse equivalent output - Google Patents
Frequency stability method for improving pulse equivalent output Download PDFInfo
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- CN114353894A CN114353894A CN202111606031.8A CN202111606031A CN114353894A CN 114353894 A CN114353894 A CN 114353894A CN 202111606031 A CN202111606031 A CN 202111606031A CN 114353894 A CN114353894 A CN 114353894A
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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
- G01F15/001—Means for regulating or setting the meter for a predetermined quantity
- G01F15/003—Means for regulating or setting the meter for a predetermined quantity using electromagnetic, electric or electronic means
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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
- G01F1/56—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 electric or magnetic effects
- G01F1/58—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 electric or magnetic effects by electromagnetic flowmeters
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Abstract
The invention relates to a method for improving frequency stability of pulse equivalent output, and belongs to the field of computer flow control. The method comprises the following steps: acquiring an accumulated value of a previous time period and a previous reserved value; acquiring a pulse equivalent; calculating the number of pulses output in the current time period and a later reservation value according to the accumulated value of the previous time period, the previous reservation value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period; and outputting data according to the number of pulses in each time period. The method overcomes the defect of unstable frequency of pulse equivalent output, and has the effect of enabling the signal output by the electromagnetic flowmeter to accurately represent the instantaneous flow.
Description
Technical Field
The application relates to the field of computer flow control, in particular to a frequency stability method for improving pulse equivalent output.
Background
The loading metering system comprises an instrument end and a loading terminal, and two practical problems of metering and control need to be considered in the loading process. The meter end is used for metering, i.e. for detecting the accumulated flow through, and the metering is commonly used for trade settlement. And then, instantaneous flow, namely flow speed, is obtained through accumulated flow calculation, and whether the flow speed meets the requirements of the loading terminal or not is judged through the instantaneous flow, so that the flow speed is convenient to control.
The meter end usually adopts a turbine flowmeter or an electromagnetic flowmeter to detect the accumulated flow, and when the turbine flowmeter is adopted for flow timing, the turbine flowmeter has the defects that the measurement precision is not high, the caliber cannot exceed DN200 and the like, so that errors exist in the detected accumulated flow. Therefore, the turbine flowmeter is often replaced by an electromagnetic flowmeter, but the instantaneous flow rate is not considered when the electromagnetic flowmeter is used for generating pulses corresponding to the accumulated flow rate. The principle of the electromagnetic flowmeter that does not take into account the instantaneous flow is as follows:
referring to fig. 1, in the prior art, the output process of the electromagnetic flowmeter is as follows: representing the accumulated flow detected in the previous time stage by the number of pulses outputting the current time stage; when the cumulative flow rate at the time K1 is outputted at the time K2, the cumulative flow rate at the time K1 is represented by the number of six pulses, and the cumulative flow rate at the time K2 is indicated by the number of eight pulses outputted at the time K3. However, this output method can only visually represent the cumulative flow rate, and cannot accurately represent the instantaneous flow rate. Because each time phase comprises the time period of pulse output and the blank time period, in the practical application process, the pulse output frequency at different time points is different, so that the pulse frequency output representing the instantaneous flow is unstable, and the pulse frequency output is difficult to be applied to the practical detection working condition.
Disclosure of Invention
In order to enable the signal output by the electromagnetic flowmeter to accurately represent the instantaneous flow, the application provides a frequency stability method for improving the pulse equivalent output.
The application aims to provide a method for improving the frequency stability of pulse equivalent output.
The above object of the present application is achieved by the following technical solutions:
a method of improving frequency stability of a pulse equivalent output, comprising: acquiring an accumulated value of a previous time period and a previous reserved value; acquiring a pulse equivalent; calculating the number of pulses output in the current time period and a later reservation value according to the accumulated value of the previous time period, the previous reservation value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period; and outputting data according to the number of pulses in each time period.
By adopting the technical scheme, firstly, the accumulated value of the previous time period, the prior reserved value and the pulse equivalent are obtained, and then the number of pulses and the later reserved value of the current time period are obtained through calculation of the accumulated value of the previous time period, the prior reserved value and the pulse equivalent; then, the pulse width is changed through the number of the pulses, so that the pulses are uniformly output in the current time period, namely the stable output pulse frequency, the instantaneous flow is obtained through the pulse frequency and the pulse equivalent calculation, namely, the signal output by the electromagnetic flowmeter accurately represents the instantaneous flow, and therefore the flow velocity is conveniently regulated and controlled according to the instantaneous flow so that the flow velocity meets the working condition requirement.
The present application may be further configured in a preferred example to: the accumulated value of the previous time period is accumulated flow obtained by accumulation detection in the previous time period.
By adopting the technical scheme, the accumulated value of the previous time period is the accumulated flow obtained by accumulated detection in the previous time period, and the accumulated value of the previous time period is output in the form of the number of pulses in the current time period, so that the purpose of obtaining the number of pulses by calculating the accumulated value is achieved.
The present application may be further configured in a preferred example to: the pulse equivalent value is a preset value.
Through adopting above-mentioned technical scheme, the equivalent weight is the default, and specific numerical value can set up according to actual conditions, has improved the practicality of this application.
The present application may be further configured in a preferred example to: the method for calculating the number of pulses output in the current time period according to the accumulated value of the previous time period, the previous reserved value and the pulse equivalent comprises the following steps:
Wherein, P is the pulse equivalent, r1 is the prior reservation value, t2 is the accumulated flow of the current time period, and n2 is the number of pulses output by the current time period.
The present application may be further configured in a preferred example to: the method for calculating the later reservation value according to the accumulated value of the previous time period, the earlier reservation value and the pulse equivalent comprises the following steps:
By adopting the technical scheme, if the current time period completely outputs all the accumulated values in the previous time period, the subsequent reserved value is 0; if the accumulated value in the previous time period is not completely output in the current time period, the backward reserved value is the residual quantity output by the accumulated value in the previous time period, and the backward reserved value occupies the number of pulses in the current time period, so that the number of pulses in the backward time period which can be obtained by the backward reserved value is calculated, and the stable pulse frequency output in the backward time period is further ensured.
The present application may be further configured in a preferred example to: the pulse width output by the current time period is to be changed when the sum of the pulse periods in the current time period is equal to the duration of the current time period, and the calculation method for changing the pulse width comprises the following steps:
By adopting the technical scheme, the output pulse width is changed through the acquired pulse number and the current time period, so that the pulse number is uniformly paved in the current time period, and the aim of outputting stable pulse frequency is fulfilled.
The present application may be further configured in a preferred example to: the data is output according to the number of pulses of each time period, the data comprises instantaneous flow, and the calculation mode of the instantaneous flow comprises the following steps:
By adopting the technical scheme, instantaneous flow, namely flow velocity, is obtained through pulse frequency and pulse equivalent calculation, so that the flow velocity in the current time period can be conveniently judged, and the flow velocity of the electromagnetic flowmeter is prevented from exceeding a flow velocity threshold value. Therefore, when the flow is overlarge, the loading terminal is not easy to control when reaching the maximum value; or the flow is too small, the time required for the loading terminal to be filled is too long. Therefore, by adopting the technical means, the current flow velocity can be judged, and the current flow velocity can be conveniently adjusted.
The second purpose of the application is to provide a frequency stability device for improving pulse equivalent output.
The second application object of the present application is achieved by the following technical scheme:
a first obtaining module: the system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring a previous time period accumulated value and a previous reserved value;
a second obtaining module: for obtaining a pulse equivalent;
a calculation module: the pulse counting device is used for counting the number of pulses output in the current time period and the post-reserved value according to the accumulated value of the previous time period, the pre-reserved value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period;
a determination module: and the pulse generator is used for outputting data according to the number of pulses in each time period.
The third purpose of the application is to provide an intelligent terminal.
The third objective of the present application is achieved by the following technical solutions:
the intelligent terminal comprises a memory and a processor, wherein the memory is stored with computer program instructions of a calculation mode of the number of the pulses, a calculation mode of a post-reserved value, a calculation mode of a changed pulse width and a calculation mode of instantaneous flow, which can be loaded and executed by the processor.
It is a fourth object of the present application to provide a computer medium capable of storing a corresponding program.
The fourth application purpose of the present application is achieved by the following technical solutions:
a computer-readable storage medium stores a computer program for calculating the number of pulses, calculating the post-reserve value, calculating the change pulse width, and calculating the instantaneous flow rate, which can be loaded and executed by a processor.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the pulse frequency is obtained by calculating the number of pulses, and the instantaneous flow, namely the flow velocity, is obtained by calculating the pulse frequency and the preset pulse equivalent, so that the flow velocity in the current time period can be conveniently judged, and the flow velocity of the electromagnetic flowmeter is prevented from exceeding a flow velocity threshold value, so that the loading terminal is difficult to control when the flow is too large and the maximum value is reached; or the flow is too small, the time required for the loading terminal to be filled is too long. Therefore, by adopting the technical means, the current flow velocity can be judged, and the current flow velocity can be conveniently adjusted.
Drawings
Fig. 1 is a prior art illustration of the background of the present application.
Fig. 2 is a flowchart of a method for improving frequency stability of pulse equivalent output according to an embodiment of the present application.
Fig. 3 is an exemplary diagram of a frequency stability scheme for improving pulse equivalent output according to an embodiment of the present application.
Fig. 4 is a block diagram of a frequency stabilization apparatus for improving pulse equivalent output according to an embodiment of the present application.
Description of reference numerals: 10. a first acquisition module; 20. a second acquisition module; 30. a calculation module; 40. and determining a module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The electromagnetic flowmeter is adopted at the instrument end, then the accumulated flow which flows through the electromagnetic flowmeter in the previous time period is detected, and the detected accumulated flow is analyzed and processed and finally output in the form of pulse number. In this application, the accumulated traffic flowing in the previous time period is also referred to as the previous time period accumulated value.
The embodiment of the application provides a method for improving the frequency stability of pulse equivalent output, and the main flow of the method is described as follows.
Referring to fig. 2:
step S01: and acquiring a previous time period accumulated value and a previous reserved value.
Before obtaining the accumulated value, the working time of the electromagnetic flowmeter is divided into a plurality of time periods, and the time difference values of the time periods can be equal or unequal. In the present embodiment, the one-time complete working time is set as K, and K is divided into a time K21 phase, a time K22 phase, and a time K23 phase.
Through a plurality of divided time stages, the accumulated value and the prior reserved value in each time stage are respectively obtained through the electromagnetic flow meter, and then the accumulated value and the prior reserved value are transmitted to the server through the electromagnetic flow meter and are analyzed and processed by the server. The prior reservation value is the remaining amount of the accumulated value of the previous time output in the current time period, and the remaining amount can be obtained through detection of the electromagnetic flowmeter.
Step S02: the pulse equivalent is obtained.
The pulse equivalent contains information of how many units each pulse includes, and the pulse equivalent can be set in advance by an electromagnetic flowmeter, and the specific set value is set according to actual needs, and is not limited herein.
Step S03: calculating the number of pulses output in the current time period and a later reservation value according to the accumulated value of the previous time period, the previous reservation value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period.
And calculating the number of pulses output in the current time period and the post-reserved value based on the acquired accumulated value, the pre-reserved value and the pulse equivalent, so as to obtain the number of pulses output by the accumulated value in the previous time period in a pulse form in the current time period and the residual quantity output by the accumulated value in the previous time period, wherein the residual quantity will be output in a pulse number form in the next time period and occupy the time length in the next time period.
Specifically, the method for calculating the number of pulses output in the current time period comprises the following steps:
Wherein, P is the pulse equivalent, r1 is the prior reservation value, t2 is the accumulated flow of the current time period, and n2 is the number of pulses output by the current time period. In the above formula for calculating the number of pulses output in the current time period, when:
when the time is longer, the accumulated value in the previous time period is completely output in a pulse form in the current time period, and the later reserved value is equal to the earlier reserved value. Otherwise, when:
it means that the accumulated value in the previous time period is not completely output in a pulse form in the current time period, that is, the subsequent reserved value is larger than the previous reserved value.
The method for calculating the post-reservation value comprises the following steps:
For ease of understanding, the calculation of the number of pulses is illustrated. Examples are as follows:
referring to fig. 3, r1=2, t2=8, p = 2; then the number of pulses is obtained as:
i.e. n2<4。
When n =4, the number of the bits is increased,
the number of pulses in the current time period is 4, and the subsequent reserved value is equal to the previous reserved value and is 2;
when n =3, the number of the bits is increased,
the number of pulses in the current time period is 3, and the later reserved value is 2;
when n =2, the number of the bits is increased,
the number of pulses in the current time period is 2, and the later reserved value is 6;
when n =1, the number of the bits is set to n =1,
it is stated that the number of pulses in the current time period is 1, and the post-reserve value is 8.
The following calculation procedures are obtained: the number of pulses output in the current time period not only includes the number of pulses output in the current time period, but also includes the number of pulses output in a pulse form by a prior reserved value. In order to improve the frequency stability of the pulses output in the current time period, the pulse width in the current time period needs to be changed, so that the number of the pulses is uniformly spread over the current time period. In the present embodiment, the pulse frequency indicates how many pulses are uniformly output in the current time period, that is, the value of the pulse frequency is equal to the value of the number of pulses.
The above calculation formula for changing the pulse width is:
where k is the changed pulse width and T1 is the duration of the current time period.
The pulse width is obtained by changing the calculation formula of the pulse width, so that the sum of the pulse periods in the current time period is equal to the duration of the current time period, and the stability of the output pulse frequency is improved.
Step S04: and outputting data according to the number of pulses in each time period.
The pulse width is calculated based on the number of pulses in a time period, so that stable pulse frequency is obtained, the obtained pulse frequency is converted into instantaneous flow with actual utility, the instantaneous flow is flow velocity, whether the pulse output by the electromagnetic flowmeter exceeds a velocity threshold value is judged according to the flow velocity, and then the current flow velocity is convenient to adjust. Specifically, the output data includes an instantaneous flow rate, and the calculation formula of the instantaneous flow rate is:
For convenience of explanation, the calculation process of the instantaneous flow rate is exemplified as follows.
Example 1: setting a speed threshold range of the electromagnetic flowmeter to be 5-15, P =2, and l2= 6; then the following results are obtained:
the instantaneous flow is 12, and 12 falls into the range of 5-15, so that the instantaneous flow meets the requirements of the loading terminal.
Example 2: setting a speed threshold range of the electromagnetic flowmeter to be 5-15, P =3, and l2= 6; then the following results are obtained:
the instantaneous flow is 18, and 18 surpasss 5 ~ 15 scope, so this instantaneous flow is not conform to the requirement at loading terminal, and the instantaneous flow can be controlled to the aperture of this moment accessible regulation electromagnetic flowmeter for the instantaneous flow satisfies the operating mode demand.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that the acts and modules referred to are not necessarily required in this application.
The above is a description of method embodiments, and the embodiments of the present application are further described below by way of apparatus embodiments.
The application also provides a frequency stability device for improving the pulse equivalent output.
Referring to fig. 4, a frequency stabilization apparatus for improving a pulse equivalent output includes a first obtaining module 10: the system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring a previous time period accumulated value and a previous reserved value; the second acquisition module 20: for obtaining a pulse equivalent; the calculation module 30: the pulse counting device is used for counting the number of pulses output in the current time period and the post-reserved value according to the accumulated value of the previous time period, the pre-reserved value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period; the determination module 40: and the pulse generator is used for outputting data according to the number of pulses in each time period.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the described module may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In order to better execute the program of the method, the application also provides an intelligent terminal which comprises a memory and a processor.
Wherein the memory is operable to store an instruction, a program, code, a set of codes, or a set of instructions. The memory may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function, and instructions for implementing the above-mentioned number of pulses, the post-reservation value, the pulse width and instantaneous traffic; the storage data area may store the above-described calculation method of the number of pulses, the calculation method of the post-reservation value, the calculation method of the change pulse width, and the accumulated value involved in the calculation method of the instantaneous flow rate, the pre-reservation value, the number of pulses, the pulse equivalent, the post-reservation value, the pulse frequency, the instantaneous flow rate, and the like.
A processor may include one or more processing cores. The processor executes or executes the instructions, programs, code sets, or instruction sets stored in the memory, calls data stored in the memory, performs various functions of the present application, and processes the data. The processor may be at least one of an application specific integrated circuit, a digital signal processor, a digital signal processing device, a programmable logic device, a field programmable gate array, a central processing unit, a controller, a microcontroller, and a microprocessor. It is understood that the electronic devices for implementing the above processor functions may be other devices, and the embodiments of the present application are not limited in particular.
The present application also provides a computer-readable storage medium, for example, comprising: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk. The computer readable storage medium stores a computer program that can be loaded by a processor and that implements the above-described method of improving the frequency stability of a pulse equivalent output.
The foregoing description is only exemplary of the preferred embodiments of the invention and is provided for the purpose of illustrating the general principles of the technology. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the disclosure. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A method of improving frequency stability of a pulse equivalent output, comprising:
acquiring an accumulated value of a previous time period and a previous reserved value;
acquiring a pulse equivalent;
calculating the number of pulses output in the current time period and a later reservation value according to the accumulated value of the previous time period, the previous reservation value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period;
and outputting data according to the number of pulses in each time period.
2. The method of claim 1, wherein the accumulated value of the previous time period is an accumulated flow rate obtained by accumulating detection in the previous time period.
3. The method of claim 1, wherein the pulse equivalent value is a predetermined value.
4. The method for improving frequency stability of pulse equivalent output according to claim 1, wherein the method for calculating the number of pulses output in the current time period according to the accumulated value of the previous time period, the previous reserved value and the pulse equivalent comprises:
Wherein, P is the pulse equivalent, r1 is the prior reservation value, t2 is the accumulated flow of the current time period, and n2 is the number of pulses output by the current time period.
5. The method of claim 1, wherein the calculating the post-reserve value from the previous time period accumulated value, the pre-reserve value and the pulse equivalent comprises:
6. The method according to claim 1, wherein the sum of the pulse periods in the current time period is equal to the duration of the current time period, and the calculation method for changing the pulse width comprises:
7. The method of claim 1, wherein the outputting data according to the number of pulses per time period comprises an instantaneous flow rate, and the instantaneous flow rate is calculated by:
8. A frequency stabilization apparatus for improving pulse equivalent output, comprising:
first acquisition module (10): the system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring a previous time period accumulated value and a previous reserved value;
second acquisition module (20): for obtaining a pulse equivalent;
a calculation module (30): the pulse counting device is used for counting the number of pulses output in the current time period and the post-reserved value according to the accumulated value of the previous time period, the pre-reserved value and the pulse equivalent; the sum of the pulse periods in the current time period is equal to the duration of the current time period;
determination module (40): and the pulse generator is used for outputting data according to the number of pulses in each time period.
9. An intelligent terminal, comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, in which a computer program is stored which can be loaded by a processor and which executes the method of any one of claims 1 to 7.
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