CN103278200B - A kind of detection of gas flow rate method - Google Patents
A kind of detection of gas flow rate method Download PDFInfo
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- CN103278200B CN103278200B CN201310188498.4A CN201310188498A CN103278200B CN 103278200 B CN103278200 B CN 103278200B CN 201310188498 A CN201310188498 A CN 201310188498A CN 103278200 B CN103278200 B CN 103278200B
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Abstract
The invention discloses a kind of detection of gas flow rate method, comprising：When under standard metering pattern, be sampling time interval with the first sampling time interval, the first sampling carried out with the first power supply opening time, when carry out pre-determined number first sampling be not detected by air-flow when, it is judged as airless, by standard metering pattern switching to standby mode；In standby mode, it is sampling time interval with the second sampling time interval, second sampling is carried out with second source opening time, airless is judged whether by the second sampling, if, then proceed the second sampling, if it is not, then enter standard metering pattern, wherein, second sampling time interval is more than the first sampling time interval, and second source opening time was less than for the first power supply opening time.Detection of gas flow rate method of the invention extends sampling time interval in standby mode, and shortens operating time, so as to while the accuracy of measurement is ensured and reduce the power consumption of detection of gas flow rate device.
Description
Technical field
The present invention relates to gas flow rate field, more particularly to a kind of detection of gas flow rate method.
Background technology
Detection of gas flow rate device predominantly the diaphragm type gas flow detection means and turbine type gas for largely using at present
Flow detector.Wherein, diaphragm type gas flow detection means is the positive displacement measured to the volume of gas using epithelium
Mechanical detection of gas flow rate device, turbine type detection of gas flow rate device is the main species in velocity flowmeter, is use
The rotor of blade（Turbine）The mechanical detection of gas flow rate device that sense gasses mean flow rate is measured.But both devices
Low with precision, easily aging, temperature influence is big, and volume is big, the shortcomings of not light.
For these problems, there are some research institutions and company to propose based on microelectromechanical systems (MEMS, Micro-
Electro＆Mechanical System) detection of gas flow rate device, predominantly thermal type gas quality flow detector.
One MEMS is mainly including micro mechanism, microsensor, micro actuator and corresponding process circuit etc.
Several parts.MEMS uses the material based on silicon, using with integrated circuit（IC）Similar generation technique is produced.
Detection of gas flow rate device based on MEMS technology is the detection of gas flow rate device made using MEMS technology, bag
Include the detection of gas flow rate devices such as domestic gas meter, industrial flow meter.Thermal type gas quality flow detector is to utilize fluid
The detection of gas flow rate device that is measured to the flow of gas of heat propagation principle, wherein, during heat propagation principle is flowing
Fluid and thermal source（The object heated in fluid）Between heat exchange there is intrinsic internal relation, and have the Mathematical Modeling can be with
This relation is expressed.
Wherein, thermal type gas quality flow detector must carry out electric adding when gas flow is measured to sensor chip
Heat, method according to the temperature difference or power consumption calculates gas flow.This scheme is because want heating sensor chip, therefore meeting
Produce larger power consumption.Power consumption will result in greatly product and must be introduced into mains supply in use or frequently change battery, give
The popularization and application of product bring very big obstacle.
Although thermal type gas quality flow detector has high precision, non-aging, temperature influence is small, and volume
Small, the advantages of light, but its power problems when using is the technical problem underlying that it is present.
Fig. 1 is when prior art has an air-flow and power supply opening timing diagram and flow velocity response characteristic timing diagram during airless.
Wherein, Fig. 1 upper lefts 11 are flow velocity response characteristic timing diagram when having air-flow, and flow velocity response when Fig. 1 upper rights 12 are airless is special
Property timing diagram；Fig. 1 lower-lefts 21 are power supply opening timing diagram when having air-flow；Fig. 1 bottom rights 22 be airless when power supply opening when
Sequence figure.
As shown in figure 1, existing thermal type gas quality flow detector is mainly spaced in the method for solving power consumption
Regular time t1 '（Sampling time interval）Turn on the power and continue certain working time t2 '（Operating time）, and from Fig. 1
In as can be seen that when either having an air-flow or during airless, the operating time t2 ' of sampling time interval t1 ' and power supply is not
Become.
To ensure the precision of metering, sampling time interval t1 ' requirements are shorter, more accurate closer to power supply opening time t2 ',
Power supply opening time t2 ' requires the sufficiently long time to ensure that flow sensor obtains complete flow velocity response characteristic.Collection one
Secondary gas flow rate is used as the mean flow rate in interval time, and interlude is more long, and the time of power supply opening is shorter, and power consumption is got over
It is low.Therefore, if to reduce power consumption, can only increase sampling time interval t1 ' or reduce power supply opening time t2 ' carries out sample streams
Speed reduces power consumption, it is done so that can also reduce the degree of accuracy of measurement simultaneously.
Therefore, the detection method of the detection of gas flow rate device based on MEMS technology of prior art can not ensure to survey
While the degree of accuracy of amount, and the power consumption of detection of gas flow rate device can be reduced.
The content of the invention
It is an object of the invention to propose a kind of detection of gas flow rate method, the gas based on MEMS technology can ensured
While the accuracy of the measurement of flow detector and can reduce its power consumption.
The invention discloses a kind of detection of gas flow rate method, wherein, detection of gas flow rate device is in each sampling time
Turned on the power with operating time in interval and gas flow rate is sampled, methods described includes：
It is sampling time interval with the first sampling time interval when under standard metering pattern, with the first power supply opening
Time carries out the first sampling for operating time, when carry out pre-determined number first sampling be not detected by air-flow when, be judged as airless,
By standard metering pattern switching to standby mode；
It is sampling time interval with the second sampling time interval in the standby mode, with second source opening time
For operating time carries out the second sampling, airless is judged whether by the second sampling, if so, then proceed the second sampling, if
It is no, then into the standard metering pattern, wherein,
Second sampling time interval is more than first sampling time interval, and the second source opening time is less than
The first power supply opening time.
Preferably, included by the standard metering pattern switching by the standard metering pattern switching to the standby mode
For air-flow whether there is detection pattern, then the standby mode is switched to, wherein,
In the air-flow whether there is detection pattern, the sampling time interval increases successively from first sampling time interval
Plus, the 3rd sampling is carried out as the operating time with the second source opening time, judged whether without gas by the 3rd sampling
Stream, if so, then maintain the air-flow whether there is detection pattern, if it is not, then entering the standard metering pattern；
When maintaining the air-flow to whether there is detection pattern, when the sampling time interval from first sampling time interval
When increasing to second sampling time interval, then into the standby mode.
Preferably, the pre-determined number first is sampled as continuous pre-determined number first and samples.
When preferably, under the standard metering pattern, if the deviation of the sampling of the pre-determined number first is inclined less than predetermined
Difference, then increase the sampling time interval；If the deviation of the sampling of the pre-determined number first is more than target offset, reduce described
Sampling time interval.
Preferably, first sampling time interval of second sampling time interval more than 10 times, second electricity
/ 10th of source opening time less than the first power supply opening time.
Preferably, second sampling time interval is 20s, and the second source opening time is 1ms.
Preferably, first sampling time interval is more than or equal to 0.5s less than or equal to 15s, during first power supply opening
Between less than or equal to 100ms and more than or equal to 5ms.
Preferably, first sampling time interval is 1s, and the first power supply opening time is 20ms.
Preferably, the pre-determined number is 2-10 times.
Preferably, the detection of gas flow rate device is the detection of gas flow rate dress based on micro-electronic mechanical system technique
Put.
Detection of gas flow rate method of the invention enters standby mode by from standard metering pattern, prolongs in standby mode
Sampling time interval long, and shorten operating time, so as to while the accuracy of measurement is ensured and reduce gas stream
The power consumption of amount detecting device.
Brief description of the drawings
Fig. 1 is when prior art has an air-flow and power supply opening timing diagram and flow velocity response characteristic timing diagram during airless；
Fig. 2 is when the present invention has an air-flow and power supply opening timing diagram and flow velocity response characteristic timing diagram during airless；
Fig. 3 is the flow chart of the detection of gas flow rate method of first embodiment of the invention；And
Fig. 4 is the flow chart of the detection of gas flow rate method of second embodiment of the invention.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.May be appreciated
It is that specific embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.Further need exist for explanation
, for the ease of description, part rather than full content related to the present invention is illustrate only in accompanying drawing.
Fig. 2 is when the present invention has an air-flow and power supply opening timing diagram and flow velocity response characteristic timing diagram during airless；Fig. 3
It is the flow chart of the detection of gas flow rate method of first embodiment of the invention.
As shown in Figures 2 and 3, first embodiment of the invention provides a kind of detection of gas flow rate method, wherein, gas stream
Amount detecting device is turned on the power with operating time in each sampling time interval and the flow velocity of gas is sampled, the gas stream
Quantity measuring method is comprised the following steps：
S310, when under standard metering pattern, be sampling time interval with the first sampling time interval t1, with first electricity
Source opening time t2 carries out the first sampling for operating time, when carry out pre-determined number first sampling be not detected by air-flow when, judge
It is airless, by standard metering pattern switching to standby mode.
Wherein, detection of gas flow rate device can be based on micro-electronic mechanical system technique（MEMS）Detection of gas flow rate
Device, the detection of gas flow rate device based on MEMS can be thermal type gas quality flow detector, comprising domestic gas meter,
The detection of gas flow rate device such as industrial flow meter.
In detection of gas flow rate device, then the working power of its flow sensor can be opened every sampling time interval
Close, the time span of opening is that the operating time of power supply will ensure that flow sensor obtains complete flow velocity response characteristic,
When being exactly under standard metering pattern, every the first sampling time interval t1, then the lasting first power supply opening time is turned on the power
t2.Preferably, pre-determined number first is sampled as continuous pre-determined number first and samples, that is to say, that continuous every the first sampling
Time interval t1, turning on the power lasting first power supply opening time t2 carries out one time first sampling, continuous first sampling time
The first sampling is carried out to pre-determined number in the t1 of interval, wherein, pre-determined number is preferably 2-10 times.
It is continuous right when flow sensor is under standard metering pattern in a preferred embodiment of the present embodiment
The flow velocity of gas carries out the detection of pre-determined number, such as continuous to detect n times, wherein, the concrete numerical value of n is according to actual conditions
It is fixed, preferably 2-10 times.If the deviation of the sampling of pre-determined number first is less than target offset, sampling time interval can be increased；
If the deviation of the sampling of pre-determined number first is more than target offset, sampling time interval can be reduced.That is in standard meter
Under amount pattern, if air-flow is more stable, the flow velocity of continuous n measured gas of detection is identical or deviation is minimum（Deviation
Less than target offset）, sampling time interval can be increased；If air-flow is more unstable, n measured gas of continuous detection
The flow velocity of body is big compared with deviation（Deviation is more than target offset）, it is possible to reduce sampling time interval.Wherein, target offset is according to the time
Situation and set.
The purpose of power consumption is saved to reach, less sampling time interval is generally first selected, if velocity deviation is smaller,
It is appropriate to increase sampling time interval, if velocity deviation is larger, can suitably reduce sampling time interval.
S330：It is sampling time interval with the second sampling time interval in standby mode, with second source opening time
For operating time carries out the second sampling, airless is judged whether by the second sampling, if so, then proceed the second sampling, if
It is no, then into standard metering pattern, wherein, the second sampling time interval is more than the first sampling time interval, and second source is opened
Time was less than for the first power supply opening time.
As shown in Fig. 2 Fig. 2 upper lefts 31 are flow velocity response characteristic timing diagram when having air-flow, when Fig. 2 upper rights 32 are airless
Flow velocity response characteristic timing diagram；Fig. 2 lower-lefts 41 are power supply opening timing diagram when having air-flow；When Fig. 2 bottom rights 42 are airless
Power supply opening timing diagram.
Wherein, as shown in Figure 2, it is preferable that first sampling time interval t1s of the second sampling time interval t3 more than 10 times,
That is, t3 ＞ 10*t1；Second source opening time t4 is less than 1/10th of the first power supply opening time t2, i.e. t4 ＜ t2/10.
Preferably, the second sampling time interval t3 is 20s, and second source opening time t4 is 1ms.Wherein, usual first sampling time
Interval t1 is more than or equal to 0.5s, i.e. 0.5s≤t1≤15s less than or equal to 15s, and the first power supply opening time t2 is less than or equal to 100ms
And more than or equal to 5ms, i.e. 5ms≤t2≤100ms.Preferably, the first sampling time interval t1 is 1s, the first power supply opening time
T2 is 20ms.
The working mechanism of the technical scheme of first embodiment of the invention is to fully take into account detection of gas flow rate device in work
After making in-site installation, a big chunk time is probably that no air-flow passes through.During this period of time, sensor can not be required
Measuring accuracy, and simply determine whether there is air-flow and pass through, and sensor need not obtain complete flow velocity response spy and answer, sensing
The device power supply opening time（That is operating time）Can shorten significantly, sampling time interval also can be lengthened suitably in addition.Therefore can be by
Standard metering pattern switching reduces power consumption to standby mode by changing the mode of operation of sensor.
The detection of gas flow rate method of first embodiment of the invention enters standby mode by from standard metering pattern, is treating
Extend sampling time interval in machine pattern, and shorten operating time, so as to ensure measurement accuracy while and energy
Reduce the power consumption of detection of gas flow rate device.Due to saving power consumption, battery extension, and relative membrane type gas stream
Amount detecting device and turbine type detection of gas flow rate device, reduce use cost.
Fig. 4 is the flow chart of the detection of gas flow rate method of second embodiment of the invention.
As shown in Figure 2 and Figure 4, second embodiment of the invention provides a kind of detection of gas flow rate method, wherein, gas stream
Amount detecting device is turned on the power with operating time in each sampling time interval and the flow velocity of gas is sampled, method bag
Include：
S410, when under standard metering pattern, be sampling time interval with the first sampling time interval, with the first power supply
Opening time carries out the first sampling for operating time, when carry out pre-determined number first sampling be not detected by air-flow when, be judged as nothing
Air-flow, detection pattern is whether there is by standard metering pattern switching to air-flow.
Wherein, detection of gas flow rate device can be based on micro-electronic mechanical system technique（MEMS）Detection of gas flow rate
Device, the detection of gas flow rate device based on MEMS can be thermal type gas quality flow detector, comprising domestic gas meter,
The detection of gas flow rate device such as industrial flow meter.
In detection of gas flow rate device, then the working power of its flow sensor can be opened every sampling time interval
Close, the time span of opening is that the operating time of power supply will ensure that flow sensor obtains complete flow velocity response characteristic,
When being exactly under standard metering pattern, every the first sampling time interval t1, lasting first power supply opening time t2 is turned on the power.
Preferably, pre-determined number first is sampled as continuous pre-determined number first and samples, that is to say, that continuous every the first sampling time
Interval t1, turning on the power lasting first power supply opening time t2 carries out one time first sampling, continuous first sampling time interval
The first sampling is carried out in t1 to pre-determined number, wherein, pre-determined number is preferably 2-10 times.
It is continuous right when flow sensor is under standard metering pattern in a preferred embodiment of the present embodiment
The flow velocity of gas carries out the detection of pre-determined number, such as continuous to detect n times, wherein, the concrete numerical value of n is according to actual conditions
It is fixed, preferably 2-10 times.If the deviation of the sampling of pre-determined number first is less than target offset, sampling time interval can be increased；
If the deviation of the sampling of pre-determined number first is more than target offset, sampling time interval can be reduced.That is in standard meter
Under amount pattern, if air-flow is more stable, the flow velocity of continuous n measured gas of detection is identical or deviation is minimum（Deviation
Less than target offset）, sampling time interval can be increased；If air-flow is more unstable, n measured gas of continuous detection
The flow velocity of body is big compared with deviation（Deviation is more than target offset）, it is possible to reduce sampling time interval.Wherein, target offset is according to the time
Situation and set.
The purpose of power consumption is saved to reach, less sampling time interval is generally first selected, if velocity deviation is smaller,
It is appropriate to increase sampling time interval, if velocity deviation is larger, can suitably reduce sampling time interval.
S420, in air-flow whether there is detection pattern, sampling time interval increases successively from the first sampling time interval t1, with
Second source opening time t4 carries out the 3rd sampling for operating time, judges whether airless by the 3rd sampling, if so, then tieing up
Hold air-flow whether there is detection pattern, if it is not, then entering standard metering pattern；When maintaining air-flow to whether there is detection pattern, when sampling
Between be spaced from the first sampling time interval t1 increase to the second sampling time interval t3 when, then into standby mode.
Wherein, in the case where air-flow whether there is detection pattern, directly reduce the first power supply opening time t2 to second source open when
Between t4, and increase sampling time interval from the first sampling time interval t3 of sampling time interval t1 to second, adopted from first
Sample time interval t1 increases sampling time interval to during t3, has such as detected air-flow and has occurred, then immediately exiting from air-flow has
Without detection pattern, into standard metering pattern；Otherwise occur as do not detected air-flow, continue to increase sampling time interval,
Until when sampling time interval is progressively adjusted to the second sampling time interval t3 by the first sampling time interval t1, then entering and treating
Machine pattern.
As a preferred embodiment of the present embodiment, in the case where air-flow whether there is detection pattern, the first power supply is directly reduced
Opening time t2 to second source opening time t4, and between increasing the sampling time with the even-multiple of the first sampling time interval t1
Every to the second sampling time interval t3, sampling time interval to the mistake of t3 is being increased with the even-multiple of the first sampling time interval t1
Cheng Zhong, has such as detected air-flow and has occurred, then immediately exit from air-flow whether there is detection pattern, into standard metering pattern；Conversely, work as adopting
When sample time interval is progressively adjusted to the second sampling time interval t3 by the first sampling time interval t1, then into standby mode.
S430：It is sampling time interval with the second sampling time interval in standby mode, with second source opening time
For operating time carries out the second sampling, airless is judged whether by the second sampling, if so, then proceed the second sampling, if
It is no, then into standard metering pattern, wherein, the second sampling time interval is more than the first sampling time interval, and second source is opened
Time was less than for the first power supply opening time.
As shown in Fig. 2 Fig. 2 upper lefts 31 are flow velocity response characteristic timing diagram when having air-flow, when Fig. 2 upper rights 32 are airless
Flow velocity response characteristic timing diagram；Fig. 2 lower-lefts 41 are power supply opening timing diagram when having air-flow；When Fig. 2 bottom rights 42 are airless
Power supply opening timing diagram.
Wherein, as shown in Figure 2, it is preferable that first sampling time interval t1s of the second sampling time interval t3 more than 10 times,
That is, t3 ＞ 10*t1；Second source opening time t4 is less than 1/10th of the first power supply opening time t2, i.e. t4 ＜ t2/10.
Preferably, the second sampling time interval t3 is 20s, and second source opening time t4 is 1ms.Wherein, usual first sampling time
Interval t1 is more than or equal to 0.5s, i.e. 0.5s≤t1≤15s less than or equal to 15s, and the first power supply opening time t2 is less than or equal to 100ms
And more than or equal to 5ms, i.e. 5ms≤t2≤100ms.Preferably, the first sampling time interval t1 is 1s, the first power supply opening time
T2 is 20ms.
The working mechanism of the technical scheme of second embodiment of the invention is to fully take into account detection of gas flow rate device in work
After making in-site installation, a big chunk time is probably that no air-flow passes through.During this period of time, sensor can not be required
Measuring accuracy, and simply determine whether there is air-flow and pass through, and sensor need not obtain complete flow velocity response spy and answer, sensing
The device power supply opening time（That is operating time）Can shorten significantly, sampling time interval also can be lengthened suitably in addition.Therefore can increase
Aerating stream whether there is detection pattern, and it is gas to be included by the standard metering pattern switching by standard metering pattern switching to standby mode
Stream whether there is detection pattern, then switches to the standby mode by air-flow whether there is detection pattern, by the Working mould for changing sensor
Formula reduces power consumption.Increased air-flow whether there is detection pattern, more accurately the presence or absence of air-flow can be judged, and by marking
Quasi- quantitative model is switched to standby mode, so as to reduce power consumption.
The detection of gas flow rate method of second embodiment of the invention is more accurately sentenced by increasing air-flow whether there is detection pattern
It is disconnected to have airless, enter standby mode from standard metering pattern, sampling time interval is extended in standby mode, and shorten work
Make duration, so as to while the accuracy of measurement is ensured and reduce the power consumption of detection of gas flow rate device.Due to saving
Power consumption, battery extension, and relative membrane type detection of gas flow rate device and turbine type detection of gas flow rate device,
Reduce use cost.
Presently preferred embodiments of the present invention is these are only, is not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of detection of gas flow rate method, wherein, detection of gas flow rate device in each sampling time interval to work when
Length is turned on the power samples to gas flow rate, it is characterised in that methods described includes：
It is sampling time interval with the first sampling time interval when under standard metering pattern, with the first power supply opening time
For operating time carries out the first sampling, when carry out pre-determined number first sampling be not detected by air-flow when, be judged as airless, by marking
Quasi- quantitative model is switched to standby mode；
It is sampling time interval with the second sampling time interval in the standby mode, with second source opening time as work
The second sampling is carried out as duration, airless is judged whether by the second sampling, if so, then proceed the second sampling, if it is not, then
Into the standard metering pattern, wherein,
Second sampling time interval is more than first sampling time interval, and the second source opening time is less than described
First power supply opening time；
The detection of gas flow rate device is the thermal type gas quality flow detector based on micro-electronic mechanical system technique, institute
Stating detection of gas flow rate device includes flow sensor, and the flow sensor is under the standard metering pattern in completely loud
State is answered, the flow sensor is in incomplete responsive state in the standby mode；
First sampling time interval of second sampling time interval more than 10 times, the second source opening time is small
In 1/10th of the first power supply opening time.
2. detection of gas flow rate method according to claim 1, it is characterised in that by the standard metering pattern switching to
The standby mode is included by the standard metering pattern switching as air-flow whether there is detection pattern, then switches to the standby mould
Formula, wherein,
In the air-flow whether there is detection pattern, the sampling time interval increases successively from first sampling time interval,
3rd sampling is carried out as the operating time with the second source opening time, airless is judged whether by the 3rd sampling,
If so, then maintain the air-flow whether there is detection pattern, if it is not, then entering the standard metering pattern；
When maintaining the air-flow to whether there is detection pattern, when the sampling time interval increases from first sampling time interval
During to second sampling time interval, then into the standby mode.
3. detection of gas flow rate method according to claim 1 and 2, it is characterised in that the pre-determined number first is sampled
For continuous pre-determined number first is sampled.
4. detection of gas flow rate method according to claim 1 and 2, it is characterised in that under the standard metering pattern
When, if the deviation of the sampling of the pre-determined number first is less than target offset, increase the sampling time interval；If described predetermined
The deviation of the sampling of number of times first is more than target offset, then reduce the sampling time interval.
5. detection of gas flow rate method according to claim 1, it is characterised in that second sampling time interval is
20s, the second source opening time is 1ms.
6. detection of gas flow rate method according to claim 1, it is characterised in that first sampling time interval is less than
It is more than or equal to 0.5s equal to 15s, the first power supply opening time is less than or equal to 100ms and more than or equal to 5ms.
7. detection of gas flow rate method according to claim 6, it is characterised in that first sampling time interval is
1s, the first power supply opening time is 20ms.
8. detection of gas flow rate method according to claim 1, it is characterised in that the pre-determined number is 2-10 times.
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| CN105783995B (en) * | 2016-03-24 | 2017-12-19 | 北京航空航天大学 | MEMS sensor, the thermal parameter measuring method based on MEMS sensor |
| CN113566921A (en) * | 2021-07-15 | 2021-10-29 | 宁波水表(集团)股份有限公司 | Counting and sampling method for intelligent water meter, intelligent water meter and storage medium |
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| JPH08122117A (en) * | 1994-10-19 | 1996-05-17 | Matsushita Electric Ind Co Ltd | Flow rate measuring device |
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| DE10134456A1 (en) * | 2001-07-16 | 2003-02-06 | Abb Research Ltd | Scanning methods for flowmeters |
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| CN1886766A (en) * | 2003-12-01 | 2006-12-27 | Ems专利股份公司 | Method and apparatus for reducing power consumption in battery-operated devices |
| CN201237539Y (en) * | 2008-04-14 | 2009-05-13 | 河南新天科技有限公司 | Calorimeter with intelligent consumption reduction and electricity saving function |
| CN102305647A (en) * | 2011-05-10 | 2012-01-04 | 安徽润尔兴仪表有限公司 | Intermittent excitation electromagnetic flowmeter and control method thereof |
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