CN101893464B - High-precision and fast pulse metering method - Google Patents
High-precision and fast pulse metering method Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims description 7
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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 measurement method, especially relate to a kind of precision height, the fast pulse measurement method of measuring speed.
Background technology
In flow metering; A lot of seized flowmeters are with pulse position metering signal output, for the full-automatic data acquisition of flow standard equipment brought very big convenient, briefly; Dispose a pulse signal acquisition module; Utilize the seized table umber of pulse in switching-over 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 seized 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 that two pulses can be arranged is calculated 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, and we can increase orthobaric volume, perhaps suitably increases Measuring Time and realizes; Pressing the DN15 water meter calculates; Can collect the umber of pulse of water meter turbine in the system through 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 mainly is able to solve through 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 seized 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 seized 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 is respectively applied for standard scale and seized table umber of pulse in a period of time with pulse timing counting unit two; 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 data recorded.Through this pulse metering device, can be that seized table measures to seized flow instrument quickly and accurately, thereby improve work efficiency, practiced thrift the energy simultaneously.
As a kind of preferred version of such scheme, said standard scale is an electromagnetic flowmeter.Standard scale adopts electromagnetic flowmeter in this pulse metering device, and the output frequency of electromagnetic flowmeter is general equal at present can reach 2KHz, and 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 seized table, add pulse number and correct time in a difference measurement standard table and seized table one interval, can obtain measuring more accurately the result in a short period of time; Thereby improved work efficiency, practiced thrift 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, simultaneously two pairs of seized tables of pulse timing counting unit carry out same processing, and two zero clearings of pulse timing counting unit also begin to wait for the pulse signal of seized 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 seized tables of pulse timing counting unit carry out same processing simultaneously, and 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 umber of pulse after measuring at measurement period internal standard table; The corresponding standard scale time; The umber of pulse of seized table and corresponding seized table time; Pulse timing counting unit then one is sent to these data in the microprocessor unit respectively with pulse timing counting unit two and handles; Based on the standard scale time; Seized table time and seized table umber of pulse confirm to detect the umber of pulse of accurate seized table in the period, in the said detection period umber of pulse of accurate seized table be by standard scale time and seized table time be divided by handle after again with the multiply each other processing and drawing of seized table umber of pulse; Generally measuring the seized table umber of pulse of coming is integer, and that the umber of pulse of accurate seized table is compared seized table umber of pulse is more accurate, can be as accurate as behind the decimal point several, makes that like this to measure the seized table impulse ratio and the error of coming out more accurate.In addition; Generally there is the error of a pulse in detected in a period of time umber of pulse, and the error of two pulses is arranged under the extreme case, is that the time of measurement is increased for the general processing mode of this situation; To reduce the influence that error is brought; And after adopting above-mentioned processing, significantly reduced Measuring Time, improved work efficiency.
D. if seized table is turbine, the unknown flowmeter of this type of vortex street impulse ratio; Calculate the standard scale volume; Umber of pulse with accurate seized table replaces seized table umber of pulse, orthobaric volume and accurate seized table umber of pulse is divided by handles the impulse ratio that obtains seized 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 seized table is the electromagnetic flowmeter of known impulse ratio,, obtain seized table volume, draw seized Watch Error value according to seized table volume, standard scale volume then with the processing of being divided by of accurate seized table umber of pulse and seized table impulse ratio.It is more accurate that this accurate seized table umber of pulse is compared the seized 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 seized table time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the seized table.
As a kind of preferred version of such scheme, the umber of pulse of accurate seized table is to be divided by to multiply each other with seized table umber of pulse after handling by standard scale time and seized table time to handle and draw again in the said detection period.After the umber of pulse of the seized table of handling through this method can be as accurate as radix point, with its calculate seized table impulse ratio or error more accurate, then just need not gather more umber of pulse to reduce relative error, shortened Measuring Time greatly.
As a kind of preferred version of such scheme, said error amount is to be wanted to subtract by seized 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: through measuring the precise time of a period of time internal standard table pulse and seized table pulse, revise seized table umber of pulse, reach rapidly and accurately the seized flow instrument with pulse signal output is measured; Thereby improved work efficiency, also practiced thrift the energy.
Description of drawings
Accompanying drawing 1 is a kind of structural frames diagrammatic sketch of pulse metering device among the present invention;
Accompanying drawing 2 is synoptic diagram that pulse metering device is sampled in a period of time among the present invention;
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
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
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 seized table 3, and this seized 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 top among Fig. 2 is the pulse signal of standard scale; Be the pulse signal of seized table below, after beginning to detect, signaling control unit sends commencing signal on chronoscope counting unit one and chronoscope counting unit two; Chronoscope counting unit one is waited for pulse signal then with two zero clearings of chronoscope counting unit; After receiving commencing signal, run in first pulse signal rising edge, chronoscope counting unit one picks up counting respectively with chronoscope counting unit two and counts, 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 seized 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 is being received end signal continued wait pulse signal with chronoscope counting unit two, and 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 seized table, and time T 1 and T2 between the pulse.Chronoscope counting unit one sends to detected data in the microprocessing unit respectively with chronoscope counting unit two and handles; Replace measuring the time period between beginning and the end with T1; The instrument coefficient of known standard table is K1, then can draw the umber of pulse P=P2*T1/T2 of accurate seized table, and the type by seized table calculates its impulse ratio or error then; If seized 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 seized table is the known metering outfit of impulse ratio K2, can draw seized table capacity V2=P2/K2, V1 is known in addition, just can draw error E=(V2-V1)/V1*100%.
Data as shown in Figure 3, as to draw for the pulse measurement method that adopts present embodiment.In order to reach the purpose of design, adopted more extreme water meter as seized 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 seized 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 seized table minimum flow in advance, last about 25 minutes.And the method for employing present embodiment; Get in touch that to record data three times as shown in Figure 3, can find out, in 30 second time, just can accurately measure the error of seized table; The pulse signal that standard scale has been exported under this environment abundant (above 30000); So,, can in 10 seconds even shorter time, accomplish accurately fully and measure through improving the frequency of standard signal.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present 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, seized 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; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (3)
1. high-precision and fast pulse metering method; It is characterized in that: this method is carried out through pulse metering device; Pulse metering device comprises with the pulse being a flowmeter and the flowmeter as seized table (3) as standard scale (2) of metering output; Be connected with pulse timing counting unit one on the standard scale; Be connected with pulse timing counting unit two (5) on the seized 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); This method comprises 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, simultaneously two pairs of described seized tables of described pulse timing counting unit carry out same processing, and two zero clearings of pulse timing counting unit also begin to wait for the pulse signal of seized 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 seized tables of pulse timing counting unit carry out same processing simultaneously, and 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 umber of pulse after measuring at measurement period internal standard table; The corresponding standard scale time; The umber of pulse of seized table and corresponding seized table time; Pulse timing counting unit then one is sent to these data in the described microprocessor unit respectively with pulse timing counting unit two and handles; Based on the standard scale time; Seized table time and seized table umber of pulse confirm to detect the umber of pulse of accurate seized table in the period, in the said detection period umber of pulse of accurate seized table be by standard scale time and seized table time be divided by handle after again with the multiply each other processing and drawing of seized table umber of pulse;
D. if seized table is turbine, the unknown flowmeter of this type of vortex street impulse ratio; Calculate the standard scale volume; Umber of pulse with accurate seized table replaces seized table umber of pulse, orthobaric volume and accurate seized table umber of pulse is divided by handles the impulse ratio that obtains seized table then;
F. if seized table is the electromagnetic flowmeter of known impulse ratio,, obtain seized table volume, draw seized Watch Error value according to seized table volume, standard scale volume then with the processing of being divided by of accurate seized table umber of pulse and seized table impulse ratio.
2. a kind of high-precision and fast pulse metering method according to claim 1; 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 seized table time is first pulse upper edge time between first pulse upper edge behind the end signal behind the commencing signal on the seized table.
3. a kind of high-precision and fast pulse metering method according to claim 1 is characterized in that said error amount is to subtract each other the back by seized table volume and standard scale volume to be divided by with the standard scale volume, draws after being multiplied by number percent again.
4. a kind of high-precision and fast pulse metering method according to claim 1 is characterized in that said standard scale (2) is an electromagnetic flowmeter.
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| CN2010102071319A CN101893464B (en) | 2010-06-23 | 2010-06-23 | High-precision and fast pulse metering method |
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| CN102843126B (en) * | 2011-06-20 | 2015-07-01 | 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 |
| 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 |
| 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 |
| CN104964729B (en) * | 2015-07-28 | 2018-04-27 | 云南卓烁科技有限公司 | A kind of calibrating installation of fluid metering instrument |
| FR3047066B1 (en) * | 2016-01-25 | 2018-02-16 | Sagemcom Energy & Telecom Sas | METHOD FOR COUNTING TIRES OF A WHEEL |
| 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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| CN108613706B (en) * | 2018-05-09 | 2020-06-30 | 杭州诚億科技有限公司 | Flow metering method based on multi-interval pulse metering |
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| CN108917888A (en) * | 2018-07-04 | 2018-11-30 | 福州金泽科技有限公司 | Intellectual water meter scaling method |
| CN108663101A (en) * | 2018-07-04 | 2018-10-16 | 福州研达自动化有限公司 | Intellectual water meter quick calibrating method |
| 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 |
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4038534A (en) * | 1975-02-27 | 1977-07-26 | Mohammad Kian Mirdadian | Methods and systems for use with pulse train circuitry |
| CN2114148U (en) * | 1992-02-20 | 1992-08-26 | 连云港水表厂 | Means for testing or calibrating water meter using microcomputers |
| CN101581596A (en) * | 2009-06-05 | 2009-11-18 | 浙江省计量科学研究院 | Flow detecting method based on double-time measurement technology and apparatus thereof |
| CN201707114U (en) * | 2010-06-23 | 2011-01-12 | 宁波明泰流量设备有限公司 | High-precision rapid pulse metering device |
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