CN112577555A - Intelligent water meter without magnetic sampling and forward and backward metering - Google Patents
Intelligent water meter without magnetic sampling and forward and backward metering Download PDFInfo
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- CN112577555A CN112577555A CN201910933610.XA CN201910933610A CN112577555A CN 112577555 A CN112577555 A CN 112577555A CN 201910933610 A CN201910933610 A CN 201910933610A CN 112577555 A CN112577555 A CN 112577555A
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- 238000005070 sampling Methods 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229920003023 plastic Polymers 0.000 claims abstract description 24
- 239000004033 plastic Substances 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000010355 oscillation Effects 0.000 claims description 14
- 230000001939 inductive effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 230000005389 magnetism Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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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
- G01F1/582—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 without electrodes
-
- 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
- G01F15/06—Indicating or recording devices
-
- 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
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses an intelligent water meter without magnetic sampling and forward and reverse metering, which comprises a water meter base meter and an electronic control part, and is characterized in that: the water meter base meter adopts a novel rotor type impeller structure, a round pointer with half being made of metal sheets and the half being made of plastic is arranged on the water meter base meter, and the electronic control part is provided with two inductors; the flow and the forward and reverse rotation metering are judged by judging the state of the inductor when the character wheel rotates, compared with the general non-magnetic technology that 4 states need to be judged to realize the flow metering, the invention can realize the flow measurement of the water meter only by judging three states, and the invention adopts the temperature compensation algorithm to ensure the accuracy of non-magnetic sampling and improve the accuracy of the non-magnetic metering.
Description
Technical Field
The invention relates to the field of intelligent water meters, in particular to an intelligent water meter without magnetic sampling and with forward and reverse metering.
Background
At present, a user in the market still mainly uses a mechanical meter, and in order to realize remote meter reading, the mechanical meter needs to be modified, and the conventional method is to add a magnet on a basic meter and externally or internally arrange a sampling reed pipe or a Hall or magneto-resistance device on the meter. The sampling modes belong to application scenes that magnetic sampling is available, magnetic attack is easy to occur, the forward and reverse metering is not easy to realize due to the limitation of device parameters, one pulse is generally sampled to represent 10L water or 100L water, the sampling precision is low, and water leakage monitoring is difficult to realize
Under the condition, the non-magnetic water meter is favored by water meter manufacturers due to the high metering precision, the non-magnetism, the no impurity adsorption, the no artificial interference and the like, and has wide market prospect.
The nonmagnetic sampling uses the principle of LC oscillation, when the inductor is above the metal part, the LC oscillation is damped oscillation, the amplitude attenuation is fast, when the inductor is above the plastic part, the LC oscillation is undamped oscillation, the amplitude attenuation is slow. The current position of the inductor can be judged whether the current position is on the plastic part or the metal part by distinguishing damped oscillation from undamped oscillation, so that the rotation quantity of the character wheel can be judged, and the water flow can be obtained according to the number of pulses corresponding to one rotation of the character wheel.
Disclosure of Invention
The invention aims to provide an intelligent water meter which does not have magnetic sampling water meter flow and can measure forward and backward, wherein the flow and the forward and backward measurement are judged by judging the state of an inductor when a character wheel rotates, and compared with 4 states required in the general non-magnetic technology, the flow measurement is realized by judging the three states.
The technical scheme of the invention is as follows:
intelligent water gauge of no magnetism sampling, positive reverse measurement contains water gauge base table and electronic control part, characterized by: the water meter base meter adopts a novel rotor type impeller structure, a round pointer with half being made of metal sheets and the half being made of plastic is arranged on the water meter base meter, and the electronic control part is provided with two inductors;
the intelligent water meter without magnetic sampling and forward and reverse metering comprises the following metering processes:
s1: starting timing by self-excited LC oscillation, taking half envelope of the LC oscillation, inputting the envelope waveform into a comparator, and turning over the comparator when the envelope voltage is reduced to 0.7V, and stopping timing to obtain a time T;
s2: the circular pointer is rotated, and when the inductor is in the middle position of the metal sheet, the minimum value of T is obtained according to the step S1
When the inductor is in the middle of the plastic part, the inductor is obtained
，
And
the intermediate value of (A) is the decision line
Such as
，Then the inductor is judged to be on the plastic part, i.e. the inductor is in state 1;
if so, judging that the inductor is on the metal part, namely the inductor is in a state of 0;
s3: ensuring the stability of the inductance state: due to the uncertainty of the time measurement T and the normal jitter of the character wheel caused by the external influence, the T value has a jump range in the static state
T is at
When nearby, the two states of 0 and 1 can be frequently switched, and in order to avoid the situation, the two states are switched
As a hysteresis-induced decision process, it must be satisfied when changing from inductive state 0 to inductive state 1
(ii) a The change from the inductive state 1 to the inductive state 0 must be satisfied
；
S4: decision line
Judgment of accuracy A-temperature Change: the parameters of the circuit elements will change to some extent under the influence of the environment, and in order to ensure the accuracy of Tj, the influence of the environmental change needs to be compensated for
The most significant is the temperature, which, as the temperature increases,
and
all increase when the temperature is reduced
And
all will decrease, and the temperature and
the change rule of the temperature-controlled variable valve meets the following formula at-10-60 ℃:
s5: decision line
Judgment of accuracy B-aging of components: in order to avoid the influence of field factors such as aging of the device, when the continuous water flow is detected in the field, the current temperature at the moment is calculated according to the formula of the step S4 again
Updating the data in the compensation curve in a certain proportion each time, finally ensuring that the curve is properly adapted to the table, and selecting the temperature value and the measured time T because the temperature measured value of the temperature measuring device and the measured time T have certain uncertainty
Multiple measurements are needed to be carried out, and the average value is obtained after software filtering;
s6: decision line
Judgment of accuracy C-component difference: the working frequencies of the two inductors are different, and the inductors have certain difference, so that the two inductors use mutually independent judgment lines
，
The updating modes of the two are the same as the updating modes of the steps S4 and S5;
s7: forward and reverse metering: after the 0,1 state of each inductance can be accurately judged, the following combinations can appear in the states of the two inductances under the condition of impeller rotation:
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state A;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state B;
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state C;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state D;
when the character wheel rotates forwards, 4 sampling states appear according to the sequence of A → D → B → C → A, when the character wheel rotates backwards, the 4 sampling states appear according to the sequence of A → C → B → D → A, the sampling state A is taken as an initial value, the judgment is carried out when the state A is reached, a state Counter is defined, and when the forward state change appears, namely the state A → D, D → B, B → C, C → A changes, the Counter +1 is defined; counter-1 when a reverse state change occurs, i.e. a → C, C → B, B → D, D → a state change occurs, and when going to sample state a, if Counter =4, it means that the character wheel has gone 1 turn forward, the number of pulses + 1; if Counter = -4, the character wheel reversely rotates for one circle; in the state A, every time, after the judgment is finished, the Counter is cleared to 0;
s7, processing of the state loss condition: according to step S6, for example, the D state is lost, Counter =2 again in the a state, because only two reasonable changes occur: b → C, C → A, because the state count is a positive number, the character wheel is in forward rotation, and the state count is moved to the sampling state A again, the character wheel is in one rotation, therefore, the forward pulse is + 1; similarly, if the state is in the A state and the Counter = -2, the pulse number is +1 in the reverse direction, even if one sampling state is lost through the algorithm, the pulse number can still be accurately measured;
the invention has the beneficial effects that:
(1) the intelligent water meter without magnetic sampling and forward and reverse metering adopts the temperature compensation algorithm to ensure the accuracy of the non-magnetic sampling and improve the accuracy of the non-magnetic metering.
(2) The intelligent water meter without magnetic sampling and forward and reverse metering obtains the pulse number of the water meter by judging the states of the two inductors when the pointer rotates, and if the sampling state is lost, the accurate pulse number can be calculated by a certain algorithm, so that the readings of an electronic part and a mechanical part are always consistent.
Drawings
Fig. 1 is a schematic distribution diagram of two inductors of the intelligent water meter without magnetic sampling and forward and reverse metering.
FIG. 2 is an LC oscillation envelope diagram of the intelligent water meter without magnetic sampling and forward and reverse metering.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following description of the specific embodiments and the accompanying drawings.
Intelligent water gauge of no magnetism sampling, positive reverse measurement contains water gauge base table and electronic control part, characterized by: the water gauge base table adopts novel rotor type impeller structure, the water gauge base table be equipped with half for the sheetmetal, half for the circular pointer of plastics, the electronic control part is equipped with two inductances, specifically speaking, the inductance welds on the circuit board of electronic control part, and the position of two inductances with the plane distribution relation of circular pointer is: taking the circle center of the circular pointer as the center, the plane included angle of the two inductor installation positions is 120 degrees, as shown in figure 1;
the intelligent water meter without magnetic sampling and forward and reverse metering comprises the following metering processes:
s1: as shown in fig. 2: starting timing by self-excited LC oscillation, taking half envelope of the LC oscillation, inputting the envelope waveform into a comparator, and turning over the comparator when the envelope voltage is reduced to 0.7V, and stopping timing to obtain time T;
s2: rotating the circular pointer, and obtaining the minimum value of T according to the step 1 when the inductor is in the middle position of the metal sheet
When the inductor is in the middle of the plastic part, the inductor is obtained
，
And
the intermediate value of (A) is the decision line
Such as
，Then the inductor is judged to be on the plastic part, i.e. the inductor is in state 1;
if so, judging that the inductor is on the metal part, namely the inductor is in a state of 0;
s3: ensuring the stability of the inductance state: due to the uncertainty of the time measurement T and the normal jitter of the character wheel caused by the external influence, the T value has a jump range in the static state
T is at
When nearby, the two states of 0 and 1 can be frequently switched, and in order to avoid the situation, the two states are switched
As a hysteresis-induced decision process, it must be satisfied when changing from inductive state 0 to inductive state 1
(ii) a The change from the inductive state 1 to the inductive state 0 must be satisfied
；
S4: decision line
Determination of accuracy A-temperatureChanging: the parameters of the circuit elements are subject to certain changes due to environmental influences, in order to ensure
The accuracy of (2) is required to compensate for the effects of environmental changes
The most significant is the temperature, which, as the temperature increases,
and
will increase, when the temperature decreases,
and
all will decrease, and the temperature and
the change rule of (1) is that when the temperature is-10-60 ℃, the following formula is met:
in order to ensure the reliability in actual use and avoid inaccurate compensation caused by the deviation of a change rule and the actual temperature, the calibration is generally carried out at a central point 20 ℃ close to a working temperature interval during calibration, the actual use temperature of the water meter is also close to 20 ℃, and the compensation accuracy at the actual use temperature is ensured.
S5: decision line TJJudgment of accuracy B-device aging: in order to avoid the influence of field factors such as device aging and the like, when continuous water flow is detected on site, the real Tj at the current temperature is calculated again, the data in the compensation curve is updated, a certain proportion is updated each time, the curve is finally ensured to be suitable for a table, and a temperature value and a measured time T of the temperature measuring device are selected because certain uncertainty exists between the temperature measured value and the measured time T
Multiple measurements are needed to be carried out, and the average value is obtained after software filtering;
s6: decision line
Judgment of accuracy C-component difference: the working frequencies of the two inductors are different, and the inductors have certain difference, so that the two inductors use mutually independent judgment lines
，
The updating modes of the two are the same as the updating modes of the steps S4 and S5;
s7: forward and reverse metering: after the 0,1 state of each inductance can be accurately judged, the following combinations can appear in the states of the two inductances under the condition of impeller rotation:
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state A;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state B;
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state C;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state D;
when the character wheel rotates forwards, 4 sampling states appear according to the sequence of A → D → B → C → A, when the character wheel rotates backwards, the 4 sampling states appear according to the sequence of A → C → B → D → A, the sampling state A is taken as an initial value, the judgment is carried out when the state A is reached, a state Counter is defined, and when the forward state change appears, namely the state A → D, D → B, B → C, C → A changes, the Counter +1 is defined; counter-1 when a reverse state change occurs, i.e. a → C, C → B, B → D, D → a state change, when going to the sampling state a, if Counter =4, it indicates that 1 turn was gone forward, the number of pulses + 1; if Counter = -4, it means that one turn is done in reverse; in the state A, every time, after the judgment is finished, the Counter is cleared to 0;
s7, processing of the state loss condition: say D state is lost, Counter =2 again to a state, since only two reasonable changes occur: b → C, C → A, because the state count is a positive number, the character wheel is in forward rotation, and the state count is moved to the sampling state A again, the character wheel is in one rotation, therefore, the forward pulse is + 1; similarly, if the state Counter = -2 and the pulse is +1 in the reverse direction, the pulse number can still be accurately measured even if one sampling state is lost through the algorithm;
the invention passes through the pair decision line
The real-time tracking and the processing of the sampling state loss algorithm ensure that the electronic reading is consistent with the mechanical character wheel all the time.
Claims (2)
1. Intelligent water gauge of no magnetism sampling, positive reverse measurement contains water gauge base table and electronic control part, characterized by: the water meter base meter adopts a novel rotor type impeller structure, one half of the water meter base meter is a metal sheet, the other half of the water meter base meter is a plastic circular pointer, and the electronic control part is provided with two inductors.
2. The non-magnetic sampling, forward and reverse metering intelligent water meter as set forth in claim 1, characterized in that: s1: starting timing by self-excited LC oscillation, taking half envelope of the LC oscillation, inputting the envelope waveform into a comparator, and turning over the comparator when the envelope voltage is reduced to 0.7V, and stopping timing to obtain a time T;
s2: the circular pointer is rotated, and when the inductor is in the middle position of the metal sheet, the minimum value of T is obtained according to the step S1
When the inductor is in the middle of the plastic part, the inductor is obtained
，
And
the intermediate value of (A) is the decision line
Such as
，Then the inductor is judged to be on the plastic part, i.e. the inductor is in state 1;
if so, judging that the inductor is on the metal part, namely the inductor is in a state of 0;
s3: ensuring the stability of the inductance state: due to the uncertainty of the time measurement T and the normal jitter of the character wheel caused by the external influence, the T value has a jump range in the static state
T is at
When nearby, the two states of 0 and 1 can be frequently switched, and in order to avoid the situation, the two states are switched
As a hysteresis-induced decision process, it must be satisfied when changing from inductive state 0 to inductive state 1
(ii) a The change from the inductive state 1 to the inductive state 0 must be satisfied
；
S4: decision line
Judgment of accuracy A-temperature Change: the parameters of the circuit elements will change to some extent under the influence of the environment, and in order to ensure the accuracy of Tj, the influence of the environmental change needs to be compensated for
The most significant is the temperature, which, as the temperature increases,
and
all increase when the temperature is reduced
And
all will decrease, and the temperature and
the change rule of the temperature-controlled variable valve meets the following formula at-10-60 ℃:
s5: decision line
Judgment of accuracy B-aging of components: in order to avoid the influence of field factors such as aging of the device, when the continuous water flow is detected in the field, the current temperature at the moment is calculated according to the formula of the step S4 again
Updating the data in the compensation curve in a certain proportion each time, finally ensuring that the curve is properly adapted to the table, and selecting the temperature value and the measured time T because the temperature measured value of the temperature measuring device and the measured time T have certain uncertainty
Multiple measurements are needed to be carried out, and the average value is obtained after software filtering;
s6: decision line
Judgment of accuracy C-component difference: the working frequencies of the two inductors are different, and the inductors have certain difference, so that the two inductors use mutually independent judgment lines
，
The updating modes of the two are the same as the updating modes of the steps S4 and S5;
s7: forward and reverse metering: after the 0,1 state of each inductance can be accurately judged, the following combinations can appear in the states of the two inductances under the condition of impeller rotation:
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state A;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state B;
the inductor 1 is arranged on the plastic part (1), the inductor 2 is arranged on the plastic part (1), and the combination is defined as a sampling state C;
the inductor 1 is arranged on the metal part (0), the inductor 2 is arranged on the metal part (0), and the combination is defined as a sampling state D;
when the character wheel rotates forwards, 4 sampling states appear according to the sequence of A → D → B → C → A, when the character wheel rotates backwards, the 4 sampling states appear according to the sequence of A → C → B → D → A, the sampling state A is taken as an initial value, the judgment is carried out when the state A is reached, a state Counter is defined, and when the forward state change appears, namely the state A → D, D → B, B → C, C → A changes, the Counter +1 is defined; counter-1 when a reverse state change occurs, i.e. a → C, C → B, B → D, D → a state change occurs, and when going to sample state a, if Counter =4, it means that the character wheel has gone 1 turn forward, the number of pulses + 1; if Counter = -4, the character wheel reversely rotates for one circle; in the state A, every time, after the judgment is finished, the Counter is cleared to 0;
s7, processing of the state loss condition: according to step S6, for example, the D state is lost, Counter =2 again in the a state, because only two reasonable changes occur: b → C, C → A, because the state count is a positive number, the character wheel is in forward rotation, and the state count is moved to the sampling state A again, the character wheel is in one rotation, therefore, the forward pulse is + 1; similarly, if in the A state and Counter = -2, reverse pulse +1, even if one sampling state is lost, the pulse number can still be accurately measured through the algorithm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358169A (en) * | 2021-05-31 | 2021-09-07 | 成都朗锐芯科技发展有限公司 | Automatic calibration compensation method and device for Hall flow sensor |
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