CN101893464A - High-precision and fast pulse metering device and method thereof - Google Patents
High-precision and fast pulse metering device and method thereof Download PDFInfo
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Abstract
The invention relates to a high-precision and fast pulse metering device and a high-precision and fast pulse metering method. The method solves the problems of low precision and long time in the conventional pulse metering method. The pulse metering device comprises a standard meter and a measured meter, wherein the standard meter is connected with a first pulse timing and counting unit, and the measured meter is connected with a second pulse timing and counting unit; and input ends of the first pulse timing and counting unit and the second pulse timing and counting unit are connected to a signal control unit, and output ends of the first pulse timing and counting unit and the second pulse timing and counting unit are connected to a micro processing unit. The pulse of the standard meter is compared with the pulse of the measured meter, the number of the pulses and the correct time of the standard meter and the measured meter are measured in an interval respectively, the number of the pulses of the measured meter is corrected, and a measured flow meter which outputs a pulse signal is metered quickly and accurately, so that the working efficiency is improved and the energy is also saved.
Description
Technical field
The present invention relates to a kind of pulse metering device, especially relate to a kind of precision height, fast pulse metering device and the measuring method thereof of measuring speed.
Background technology
In flow metering, a lot of tested flowmeters are exported with pulse position metering signal, for the full-automatic data acquisition of flow standard equipment brought very big convenient, briefly, dispose a pulse signal acquisition module, utilize the tested table umber of pulse in commutation photoelectric signal collection a period of time, measurement standard flow (for example standard measuring device, electronic scales, standard scale, nozzle, volume pipe etc.) simultaneously can calculate the impulse ratio or the error of tested flow device respectively by category-A or category-B.Wherein category-A calculates the demarcation of the impulse ratio be usually used in flowmeters such as turbine, vortex street, and category-B calculates the error of the flow device that is usually used in examining and determine known impulse ratio.
In the scope two pulse signals are being measured at the same time, the error of a general pulse is normal, under extremity, the error of two pulses can be arranged, calculate by 0.2 grade of flowmeter commonly used at present, in order to guarantee measuring accuracy, the umber of pulse of required collection generally needs more than 10000, exactly by the lower water meter of ratio of precision, except 0.1 flow point in the one-shot measurement process, also to gather 1000 pulses, just 0.1 also need more than 400 at last.The instrument coefficient that bigbore flowmeter is general is all bigger, we can increase orthobaric volume, perhaps suitably increasing Measuring Time realizes, pressing the DN15 water meter calculates, can collect the umber of pulse of water meter turbine in the system by laser probe, the every circle of minimum pointer of general water meter is 1L, and the rotating ratio of impeller is roughly 10, calculate by each impeller 6 tooth, gather 400 pulses roughly needs water consumption to be:
The L=400/10/6=6.6 liter
Calculate by minimum flow 24L/h, need 17 minutes, obviously needed chronic.If adopt the standard measuring device metering of 10L, the needed time is longer.
Summary of the invention
The present invention solves long problem of low, used time of existing pulse measuring method precision, and a kind of precision height, pulse measurement method fast are provided.
The present invention also provides a kind of pulse metering device that can realize high precision, quick metering.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of high-precision and fast pulse metering device, comprise with the pulse being a flowmeter and a flowmeter of metering output as tested table as standard scale, be connected with pulse timing counting unit one on the standard scale, be connected with pulse timing counting unit two on the tested table, the input end of pulse timing counting unit one and pulse timing counting unit two is connected to a signaling control unit, and the output terminal of pulse timing counting unit one and pulse timing counting unit two is connected on the microprocessing unit.Pulse timing counting unit one and pulse timing counting unit two are respectively applied for standard scale and tested table umber of pulse in a period of time, and afterwards the time between first rising edge of a pulse is carried out record to finishing to begin back first rising edge of a pulse, the signal that signaling control unit sends beginning and finishes with paired pulses chronoscope counting unit one and pulse timing counting unit two, microprocessing unit is handled the data of record.By this pulse metering device, can be that tested table measures to tested flow instrument quickly and accurately, thereby improve work efficiency, saved the energy simultaneously.
As a kind of preferred version of such scheme, described standard scale is an electromagnetic flowmeter.Standard scale adopts electromagnetic flowmeter in this pulse metering device, the output frequency of electromagnetic flowmeter is general equal at present can reach 2KHz, what have can reach 10KHz, calculate by range ratio 10, electromagnetic flowmeter per second minimum also can be exported 200 more than the frequency, so for standard scale, can export abundant umber of pulse in one minute, can treat the pulse of electromagnetic flowmeter as full sized pules, utilize the pulse of standard scale and the pulse contrast of tested table, add pulse number and correct time in a difference measurement standard table and tested table one interval, can obtain measuring more accurately the result in a short period of time, thereby improved work efficiency, saved the energy simultaneously.
The present invention also provides a kind of employing said apparatus, and precision is higher, speed pulse measurement method faster, and it may further comprise the steps:
A. after signal controller sends commencing signal, one zero clearing of pulse timing counting unit also begins to wait for the pulse signal of standard scale, when first pulse arrives, count at the beginning and write down this rising edge of a pulse start time with rising edge of a pulse trigger pulse chronoscope counting unit, two pairs of tested tables of pulse timing counting unit carry out same processing simultaneously, two zero clearings of pulse timing counting unit also begin to wait for the pulse signal of tested table, when first pulse arrives, begin to count and write down this rising edge of a pulse start time with rising edge of a pulse trigger pulse chronoscope counting unit two;
B. after signal controller sends end signal, pulse timing counting unit one continues to wait for to next pulse and arrives, finish to count and write down this rising edge of a pulse time with rising edge of a pulse trigger pulse chronoscope counting unit one, two pairs of tested tables of pulse timing counting unit carry out same processing simultaneously, pulse timing counting unit two continues to wait for to the next pulse arrival, finishes to count and write down this rising edge of a pulse time with rising edge of a pulse trigger pulse chronoscope counting unit two;
C. obtain the umber of pulse and the corresponding tested table time of the umber of pulse at measurement period internal standard table, corresponding standard scale time, tested table after measuring, pulse timing counting unit then one and pulse timing counting unit two are sent to these data in the microprocessor unit respectively and handle, and determine to detect the umber of pulse of accurate tested table in the period according to standard scale time, tested table time and tested table umber of pulse; Generally measuring the tested table umber of pulse of coming is integer, and that the umber of pulse of accurate tested table is compared tested table umber of pulse is more accurate, can be as accurate as behind the radix point several, makes that like this to measure the tested table impulse ratio and the error of coming out more accurate.In addition, the general error that has a pulse of detected in a period of time umber of pulse, the error that two pulses are arranged under the extreme case, for the general processing mode of this situation is that the time of measurement is increased, to reduce the influence that error is brought, and after adopting above-mentioned processing, significantly reduced Measuring Time, improved work efficiency.
D. if tested table is the flowmeter of turbine, this class impulse ratio the unknown of vortex street, calculate the standard scale volume, umber of pulse with accurate tested table replaces tested table umber of pulse, orthobaric volume and accurate tested table umber of pulse is divided by handles the impulse ratio that obtains tested table then; The volume of standard scale is known, and it can be divided by by standard scale umber of pulse and standard scale impulse ratio and draw.
F. if tested table is the electromagnetic flowmeter of known impulse ratio,, obtain tested table volume, draw tested Watch Error value according to tested table volume, standard scale volume then with the processing of being divided by of accurate tested table umber of pulse and tested table impulse ratio.It is more accurate that this accurate tested table umber of pulse is compared the tested table umber of pulse of in the past using, and makes that the impulse ratio that counts out is also more accurate.
A kind of preferred version as such scheme, the described standard scale time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the standard scale, and the tested table time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the tested table.
As a kind of preferred version of such scheme, in the described detection period umber of pulse of accurate tested table be by standard scale time and tested table time be divided by handle after again with the multiply each other processing and drawing of tested table umber of pulse.After the umber of pulse of the tested table of handling by this method can be as accurate as radix point, with its calculate tested table impulse ratio or error more accurate, then just do not need to gather more umber of pulse to reduce relative error, shortened Measuring Time greatly.
As a kind of preferred version of such scheme, described error amount is to be wanted to subtract by tested table volume and standard scale volume to handle the processing of being divided by of back and standard scale volume, draws after being multiplied by number percent again.
Therefore, advantage of the present invention is: by measuring the precise time of a period of time internal standard table pulse and tested table pulse, revise tested table umber of pulse, reach rapidly and accurately the tested flow instrument with pulse signal output is measured, thereby improved work efficiency, also saved the energy.
Description of drawings
Accompanying drawing 1 is a kind of structural frames diagrammatic sketch of pulse metering device of the present invention;
Accompanying drawing 2 is synoptic diagram that pulse metering device of the present invention is sampled in a period of time;
Accompanying drawing 3 is to adopt pulse measurement method of the present invention that an electromagnetic flowmeter is measured the data plot that draws.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
A kind of high-precision and fast pulse metering device of present embodiment, as shown in Figure 1, comprise a signaling control unit 1 that beginning and end signal take place, this signaling control unit output terminal is provided with two circuits, be connected respectively on chronoscope counting unit 1 and the chronoscope counting unit 25, chronoscope counting unit one links to each other with a standard scale 2, is used for writing time and this time internal standard table umber of pulse, and this standard scale adopts electromagnetic flowmeter.Chronoscope counting unit two links to each other with tested table 3, and this tested table need detect the gauging table of its impulse ratio or error exactly.The output terminal of chronoscope counting unit one and chronoscope counting unit two is connected respectively on the microprocessing unit 6.
Use the pulse measurement method of above-mentioned high-precision and fast pulse metering device, as shown in Figure 2, pulse above among Fig. 2 is the pulse signal of standard scale, be the pulse signal of tested table below, after beginning to detect, signaling control unit sends commencing signal on chronoscope counting unit one and chronoscope counting unit two, pulse signal is waited in chronoscope counting unit one and two zero clearings of chronoscope counting unit then, after receiving commencing signal, run in first pulse signal rising edge, chronoscope counting unit one and chronoscope counting unit two pick up counting respectively and count, as shown in Figure 2, the output frequency of standard scale is higher, in the section, the umber of pulse of standard scale output is more than tested table at one time, and first pulse signal rising edge that chronoscope counting unit one runs into earlier.When measurement will finish, signaling control unit sends an end signal for chronoscope counting unit one and chronoscope counting unit two, chronoscope counting unit one and chronoscope counting unit two continue to wait for pulse signal after receiving end signal, when running into the rising edge of first pulse signal, chronoscope counting unit one and chronoscope counting unit two stop counting and timing respectively, obtain the umber of pulse P1 and the P2 of standard scale and tested table, and time T 1 and T2 between the pulse.Chronoscope counting unit one and chronoscope counting unit two send to detected data in the microprocessing unit respectively and handle, with the time period between T1 replacement measurement beginning and the end, the instrument coefficient of known standard table is K1, then can draw the umber of pulse P=P2*T1/T2 of accurate tested table, type by tested table calculates its impulse ratio or error then, if tested table is turbine, vortex street isopulse COEFFICIENT K 2 ignorant flowmeters, its impulse ratio K2=V1/P2 then, wherein V1 is the standard scale capacity, this standard scale capacity V1=P1/K1.If when tested table is the known metering outfit of impulse ratio K2, can draw tested table capacity V2=P2/K2, V1 is known in addition, just can draw error E=(V2-V1)/V1*100%.
As shown in Figure 3, the data that draw for the pulse measurement method that adopts present embodiment.In order to reach the purpose of design, adopted more extreme water meter as tested table here, because the pulsed frequency that water meter is exported is extremely low, be generally 0.4Hz under the state of minimum flow, in addition lower.Standard scale is selected the DN3 electromagnetic flowmeter for use, and its range ability is 0-120L/h, and pulse output frequency 5KHz tests tested table error in 0.5 minute under the flow of 24L/h.Use classic method (weight method, water consumption 10L) to record that error is-2.58% under the tested table minimum flow in advance, last about 25 minutes.And the method for employing present embodiment, get in touch and record data as shown in Figure 3 three times, as can be seen, in 30 second time, just can accurately measure the error of tested table, the pulse signal that standard scale has been exported under this environment abundant (above 30000), so,, can in 10 seconds even shorter time, finish accurate measurement fully by improving the frequency of standard signal.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as standard scale, tested table, signaling control unit, micro-control unit morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (6)
1. high-precision and fast pulse metering device, it is characterized in that: comprise with the pulse being a flowmeter and a flowmeter of metering output as tested table (3) as standard scale (2), be connected with pulse timing counting unit one on the standard scale, be connected with pulse timing counting unit two (5) on the tested table on (3), the input end of pulse timing counting unit one and pulse timing counting unit two is connected to a signaling control unit (1), and the output terminal of pulse timing counting unit one and pulse timing counting unit two is connected on the microprocessing unit (6).
2. a kind of high precision fast-pulse measurement mechanism according to claim 1 is characterized in that described standard scale (2) is an electromagnetic flowmeter.
3. the high-precision and fast pulse metering method of a use such as claim 1 or 2 described high-precision and fast pulse metering devices is characterized in that: comprise the steps:
A. after described signaling control unit sends commencing signal, described pulse timing counting unit one zero clearing also begins to wait for the pulse signal of described standard scale, when first pulse arrives, count at the beginning and write down this rising edge of a pulse start time with rising edge of a pulse trigger pulse chronoscope counting unit, two pairs of described tested tables of described pulse timing counting unit carry out same processing simultaneously, two zero clearings of pulse timing counting unit also begin to wait for the pulse signal of tested table, when first pulse arrives, begin to count and write down this rising edge of a pulse start time with rising edge of a pulse trigger pulse chronoscope counting unit two;
B. after signaling control unit sends end signal, pulse timing counting unit one continues to wait for to next pulse and arrives, finish to count and write down this rising edge of a pulse time with rising edge of a pulse trigger pulse chronoscope counting unit one, two pairs of tested tables of pulse timing counting unit carry out same processing simultaneously, pulse timing counting unit two continues to wait for to the next pulse arrival, finishes to count and write down this rising edge of a pulse time with rising edge of a pulse trigger pulse chronoscope counting unit two;
C. obtain the umber of pulse and the corresponding tested table time of the umber of pulse at measurement period internal standard table, corresponding standard scale time, tested table after measuring, pulse timing counting unit then one and pulse timing counting unit two are sent to these data in the described microprocessor unit respectively and handle, and determine to detect the umber of pulse of accurate tested table in the period according to standard scale time, tested table time and tested table umber of pulse;
D. if tested table is the flowmeter of turbine, this class impulse ratio the unknown of vortex street, calculate the standard scale volume, umber of pulse with accurate tested table replaces tested table umber of pulse, orthobaric volume and accurate tested table umber of pulse is divided by handles the impulse ratio that obtains tested table then;
F. if tested table is the electromagnetic flowmeter of known impulse ratio,, obtain tested table volume, draw tested Watch Error value according to tested table volume, standard scale volume then with the processing of being divided by of accurate tested table umber of pulse and tested table impulse ratio.
4. a kind of high-precision and fast pulse metering method according to claim 3, it is characterized in that the described standard scale time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the standard scale, the tested table time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the tested table.
5. according to claim 3 or 4 described a kind of high-precision and fast pulse metering methods, the umber of pulse that it is characterized in that accurate tested table in the described detection period be by standard scale time and tested table time be divided by handle after again with the multiply each other processing and drawing of tested table umber of pulse.
6. a kind of high-precision and fast pulse metering method according to claim 3 is characterized in that described error amount is to subtract each other the back by tested table volume and standard scale volume to be divided by with the standard scale volume, draws after being multiplied by number percent again.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102494744A (en) * | 2011-12-27 | 2012-06-13 | 重庆市智能水表有限责任公司 | Large-flow automatic detection device and detection method for water meters |
| CN102494743A (en) * | 2011-12-27 | 2012-06-13 | 重庆市智能水表有限责任公司 | Small-flow automatic detection device and detection method for water meters |
| CN102843126A (en) * | 2011-06-20 | 2012-12-26 | 上海协同科技股份有限公司 | Circuit for preventing counting omission of pulse data in power load management terminal |
| CN104964729A (en) * | 2015-07-28 | 2015-10-07 | 云南森格科技有限公司 | Calibrating device for fluid metering instrument |
| CN105823533A (en) * | 2016-06-17 | 2016-08-03 | 宁波明泰流量设备有限公司 | Double-clock detecting method for flowmeter |
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| CN102494744A (en) * | 2011-12-27 | 2012-06-13 | 重庆市智能水表有限责任公司 | Large-flow automatic detection device and detection method for water meters |
| CN102494743A (en) * | 2011-12-27 | 2012-06-13 | 重庆市智能水表有限责任公司 | Small-flow automatic detection device and detection method for water meters |
| CN104964729A (en) * | 2015-07-28 | 2015-10-07 | 云南森格科技有限公司 | Calibrating device for fluid metering instrument |
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| CN108458771B (en) * | 2018-02-24 | 2020-07-28 | 三川智慧科技股份有限公司 | Method for dynamically eliminating interference of plum-blossom-shaped pointer |
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| CN110703816A (en) * | 2019-07-02 | 2020-01-17 | 西安康明斯发动机有限公司 | Engine oil filling control system and control method thereof |
| CN110174145A (en) * | 2019-07-05 | 2019-08-27 | 广州论衡控制设备有限公司 | Intelligent accurate metering device |
| CN110608788A (en) * | 2019-09-12 | 2019-12-24 | 湖南工业大学 | Automatic detection system and method for flow of viscous liquid |
| CN112212949A (en) * | 2020-09-21 | 2021-01-12 | 广州能源检测研究院 | Mechanical water meter calibration method and device based on laser sensor |
| CN112212949B (en) * | 2020-09-21 | 2023-11-10 | 广州能源检测研究院 | Mechanical water meter verification method and device based on laser sensor |
| CN112729441A (en) * | 2020-12-21 | 2021-04-30 | 唐山学院 | High-precision flow measuring method based on pulse type flow sensor |
| CN112729441B (en) * | 2020-12-21 | 2022-03-22 | 唐山学院 | High-precision flow measuring method based on pulse type flow sensor |
| CN113656886A (en) * | 2021-07-28 | 2021-11-16 | 通号城市轨道交通技术有限公司 | Speed calculation method and device based on double-MCU pulse acquisition |
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