CN216899049U - Intelligent water meter non-magnetic metering filtering equipment - Google Patents
Intelligent water meter non-magnetic metering filtering equipment Download PDFInfo
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Abstract
The utility model discloses a non-magnetic metering filtering device of an intelligent water meter, which comprises a main control module, a primary coil excitation module, a processing module and an acquisition module, wherein the main control module is used for controlling the excitation module to generate a magnetic field; the main control module is respectively connected with the control module, the primary coil excitation module, the processing module and the acquisition module and is used for turning on or turning off the primary coil excitation module through the control module at a sampling frequency F; the control module is used for switching on or switching off the primary coil excitation module; the primary coil excitation module is used for generating an excitation signal and acting on the processing module; the processing module is used for receiving and processing the excitation signal to generate a voltage signal; the acquisition module is used for acquiring the voltage signal generated by the processing module, converting the voltage signal into an AD value and transmitting the AD value to the main control module. The utility model solves the problem that the water consumption metering is caused by radio frequency signal interference in the process of metering the water consumption by adopting a non-magnetic metering mode in the existing intelligent water meter.
Description
Technical Field
The utility model relates to the technical field of ultrasonic metering, in particular to an intelligent water meter non-magnetic metering filtering device.
Background
Currently, when detecting the flow rate or flow rate of a fluid, such as a liquid or a gas, the flow rate or flow rate of the liquid or the gas is calculated by rotating a mechanical part driven by the fluid. Existing mechanical meter fluid metering includes magnet metering and non-magnetic metering techniques. The mainstream fluid metering mode is magnet metering, wherein, the sensors mostly adopt reed pipes and Hall elements, and the sensors have magnetic characteristics and can send out pulse signals under the action of a magnetic field. But all have significant disadvantages such as: the reed switch is packaged by glass, is easy to crack in areas with large temperature difference and in the transportation process, has limited action times and cannot be used for high-precision measurement; the Hall element is a moisture-sensitive device and is easily influenced by humidity, so that the quiescent current of the device is large, and the battery of the metering equipment is consumed in advance. Meanwhile, the magnetic sensor can cause measurement problems when a magnet is close to the magnetic sensor, and can reversely offset measurement pulses in the user simulation measurement process, so that the interference of a magnetic field cannot be avoided. In the device based on magnetic metering, the permanent magnet is in a rotating state, and when the magnetic sensor passes by the vicinity of the magnet, the magnetic sensor is easily interfered by external magnetism, so that metering errors are caused. And the non-magnetic metering can realize metering without magnet triggering, has higher precision, higher stability and stronger strong magnetic interference resistance, really realizes the drip metering, and slowly replaces the magnet metering.
The non-magnetic metering mode brings technical breakthrough to water metering, but the problem of radio frequency signal interference cannot be avoided. At present, a Narrow-Band Internet of things (NB-IoT) module is adopted for communication in a non-magnetic water meter communication mode, and the NB-IoT module communication process, particularly interference in a network attachment process, can cause a dosing error, the root cause is that a fluctuation of induction coil current is caused by radiation generated in a module reporting process, so that mismetering is caused, and the worse communication network environment is, the more easily the situation is caused.
Existing ways to filter interference include wavelet denoising, smooth denoising, and BP neural network. The wavelet denoising is a time-frequency localization analysis method, has the characteristic of multiresolution analysis, can change a time window and a frequency window, can represent local characteristics of signals in two time-frequency domains, and can remove a high-frequency part through decomposition, but the method has large calculation amount, and the local characteristics are difficult to comprehensively reflect nonmagnetic interference signals; the smooth filtering method can meet the application of low power consumption by mechanically averaging a plurality of data, but abrupt noise easily causes large change of the whole data, a water meter needs to sample for many times, the instantaneity is poor under the condition of large change of flow, and data loss is easily caused; the BP neural network algorithm has high convergence speed, long iteration time and large calculated amount, and is not suitable for the application of a low-power consumption water meter.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide non-magnetic metering filtering equipment for an intelligent water meter, and aims to solve the problem that water is used by mistake due to radio frequency signal interference in the process of metering water by adopting a non-magnetic metering mode in the existing intelligent water meter.
In order to achieve the above object, the present invention provides a non-magnetic metering filter device for an intelligent water meter, comprising:
the device comprises a main control module, a primary coil excitation module, a processing module and an acquisition module;
the main control module is respectively connected with the control module, the primary coil excitation module, the processing module and the acquisition module and is used for turning on or turning off the primary coil excitation module through the control module at a sampling frequency F;
the control module is connected with the primary coil excitation module and used for turning on or off the primary coil excitation module;
the primary coil excitation module is connected with the processing module and used for generating an excitation signal and acting on the processing module;
the processing module is connected with the acquisition module and used for receiving and processing the excitation signal to generate a voltage signal;
and the acquisition module is used for acquiring the voltage signal generated by the processing module, converting the voltage signal into an AD value and transmitting the AD value to the main control module.
Preferably, the processing module comprises:
the secondary coil induction unit, the discharge control unit and the capacitor unit are connected in sequence;
the secondary coil induction unit is used for generating an induction signal and acting on the discharge control unit;
the discharge control unit is used for detecting the induction signal, performing discharge processing on the induction signal and transmitting the induction signal to the capacitor unit;
the capacitance unit is used for receiving the induction signal and generating a voltage signal.
Preferably, the main control module is connected with the discharge control unit and used for synchronously starting the discharge control unit.
Preferably, the acquisition module is an analog-digital converter, and the acquisition module acquires the voltage signal generated by the capacitor unit in an ADC manner.
Preferably, the intelligent water meter non-magnetic metering filtering equipment further comprises a warning module;
the warning module is respectively connected with the main control module and the external communication equipment;
and the warning module is used for comparing and analyzing the data acquired by the main control module with the normal data, and feeding back the abnormal water consumption condition of the user to the external communication equipment and giving an alarm.
Preferably, the sampling speed of the acquisition module is greater than the rotation speed of the metal disc of the intelligent water meter.
Preferably, the sampling frequency F includes a first sampling frequency F1, a second sampling frequency F2, and a third sampling frequency F3.
Preferably, the first sampling frequency F1 is 0Hz-10 Hz.
Preferably, the second sampling frequency F2 is 10Hz-20 Hz.
Preferably, the third sampling frequency F3 is greater than 20 HZ.
Preferably, the first sampling frequency F1 is 10 HZ.
Preferably, the second sampling frequency F2 is 20 HZ.
Preferably, the third sampling frequency F3 is 65 HZ.
The filtering method of the intelligent water meter non-magnetic metering filtering equipment comprises the following steps:
s1, the main control module starts a primary coil excitation module through the control module at a sampling frequency F to generate an excitation signal, and the acquisition module acquires an actual AD value in at least one period in an excitation state;
s2, the main control module closes the primary coil excitation module through the control module at the sampling frequency F, no excitation signal is generated, and the acquisition module acquires the actual AD value in at least one period in the non-excitation state;
s3, calculating the slope between every two adjacent base points of the actual AD values collected in the excitation state and the non-excitation state respectively;
s4, predicting an estimated AD value corresponding to the next period according to the slope in the excitation state obtained in the step S3;
s5, the main control module judges whether interference exists according to the change condition of the slope of the actual AD value in the non-excitation state between two adjacent base points in the corresponding period range;
if yes, filtering the actual AD value of the same sampling period in the excitation state, replacing the actual AD value with the corresponding estimated AD value, and executing the step S6;
if not, go to step S6;
and S6, the main control module adjusts the sampling frequency F by detecting the change of the actual AD value slope in the excitation state.
Preferably, the step S6, where the adjusting the sampling frequency by the main control module by detecting a change in the slope of the actual AD value in the excitation state includes:
if the actual AD value slope is smaller than a first threshold K1, executing steps S1-S5 by using a first sampling frequency F1;
if the actual AD value slope is greater than or equal to the first threshold value K1 and less than the second threshold value K2, executing steps S1-S5 by using a second sampling frequency F2;
if the actual AD value slope is greater than or equal to the second threshold K2, the third sampling frequency F3 is adopted, and the steps S1 to S5 are executed.
Preferably, the flow rate interval corresponding to the first sampling frequency F1 is 0m3/h-2m3/h。
Preferably, the flow rate interval corresponding to the second sampling frequency F2 is 2m3/h-4m3/h。
Preferably, the flow rate interval corresponding to the third sampling frequency F3 is 4m3/h-9m3/h。
In the technical scheme of the utility model, the non-magnetic metering filtering equipment of the intelligent water meter comprises a main control module, a primary coil excitation module, a processing module and an acquisition module; the main control module is respectively connected with the control module, the primary coil excitation module, the processing module and the acquisition module and is used for turning on or turning off the primary coil excitation module through the control module at a sampling frequency F; the control module is connected with the primary coil excitation module and used for turning on or off the primary coil excitation module; the primary coil excitation module is connected with the processing module and used for generating an excitation signal and acting on the processing module; the processing module is connected with the acquisition module and used for receiving and processing the excitation signal to generate a voltage signal; and the acquisition module is used for acquiring the voltage signal generated by the processing module, converting the voltage signal into an AD value and transmitting the AD value to the main control module. The utility model solves the problem that the water consumption is measured by mistake due to the interference of radio frequency signals in the process of measuring the water consumption by adopting a non-magnetic measuring mode in the existing intelligent water meter.
In the utility model, the primary coil excitation module is closed through the control module, the AD value in a non-excitation state is collected, and whether the environment has interference is judged according to whether the slope of the AD value in the non-excitation state changes suddenly.
In the utility model, the main control module sets different sampling frequencies, so that the intelligent water meter can adapt to water consumption metering in different flow intervals, thereby meeting more application scenes.
In the utility model, the warning module is connected with the external communication equipment, so that the monitoring of the water consumption condition of the user can be realized, and the abnormal water consumption condition of the user can be alarmed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of a non-magnetic metering filter device of an intelligent water meter according to an embodiment of the utility model;
fig. 2 is a schematic flow chart of a non-magnetic metering filtering method for an intelligent water meter according to an embodiment of the present invention;
FIG. 3 is a graph illustrating an actual AD value and a slope estimated AD value according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of an actual AD value under an interference condition in a non-excited state according to an embodiment of the present invention;
fig. 5 is a waveform diagram of an actual AD value in a non-excitation state without interference in the embodiment of the present invention.
The reference numbers illustrate:
1, a main control module; 2, a control module; 3 a primary coil excitation module; 4, a processing module; 41 a secondary coil induction unit; 42 a discharge control unit; 43 a capacitive unit; 5, an acquisition module; and 6, an alarm module.
The implementation, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a non-magnetic metering filter device for an intelligent water meter, comprising:
the device comprises a main control module 1, a control module 2, a primary coil excitation module 3, a processing module 4 and an acquisition module 5;
the main control module 1 is respectively connected with the control module 2, the primary coil excitation module 3, the processing module 4 and the acquisition module 5, and is used for turning on or turning off the primary coil excitation module 3 through the control module 2 at a sampling frequency F;
the control module 2 is connected with the primary coil excitation module 3 and used for turning on or off the primary coil excitation module 3;
the primary coil excitation module 3 is connected with the processing module 4 and used for generating an excitation signal and acting on the processing module 4;
the processing module 4 is connected with the acquisition module 5 and is used for receiving and processing the excitation signal to generate a voltage signal;
and the acquisition module 5 is used for acquiring the voltage signal generated by the processing module 4, converting the voltage signal into an AD value and transmitting the AD value to the main control module 1.
Specifically, in this embodiment, the processing module 4 includes: a secondary coil induction unit 41, a discharge control unit 42, and a capacitance unit 43 connected in sequence; the secondary coil induction unit 41 is used for generating an induction signal and acting on the discharge control unit 42; the discharge control unit 42 is configured to detect the sensing signal, perform discharge processing on the sensing signal, and transmit the sensing signal to the capacitor unit 43; the capacitor unit 43 is configured to receive the sensing signal and generate a voltage signal.
Specifically, in this embodiment, the main control module 1 is connected to the primary coil, and the primary coil excitation module 3 can generate an excitation signal through fast switching of high and low levels, but cannot control the primary coil excitation module 3 to be turned off, and acquire an actual AD value in a non-excited state, so as to detect whether a slope between every two adjacent base points of the actual AD value in the non-excited state changes greatly, so that, through the control module 2 connected to the main control module 1, the control module 2 is configured to control the primary coil excitation module 3 to be turned on or off, and when the control module 2 controls the primary coil excitation module 3 to be turned on, the primary coil excitation module 3 generates an excitation signal; when the control module 2 controls the primary coil excitation module 3 to be closed, the primary coil excitation module 3 generates no excitation signal, namely, the control module 2 controls the primary coil excitation module 3 to be in an excitation state or a non-excitation state, the main control module 1 detects whether the slope between every two adjacent base points of the actual AD value of the primary coil excitation module 3 in the non-excitation state changes greatly, whether interference exists is judged, when the main control module 1 judges that the interference exists, the actual AD value of the same sampling period in the excitation state is filtered, the estimated AD value of the same sampling period is predicted by using the slope of the AD value in the excitation state to replace, filtering is completed, the metering data for realizing filtering is stored to the main control module 1, the metering data is used for normal metering of water for users, and the accuracy of the water metering data is ensured.
Specifically, in this embodiment, the main control module 1 is connected to the discharge control unit 42, and is configured to synchronously turn on the discharge control unit 42, energy of the sensing signal generated by the secondary coil sensing module is relatively small, and if the discharge control unit 42 is not synchronously turned on, the sensing signal may not be detected, and the sensing signal cannot be subjected to discharge processing, and is transmitted to the capacitance unit 43.
Specifically, in this embodiment, the acquisition module 5 is an analog-to-digital converter, the acquisition module 5 acquires the voltage signal generated by the capacitor unit 43 in an ADC manner, and the acquisition module 5 converts the analog signal into a digital signal and outputs an AD value to the main control module 1.
Specifically, in this embodiment, the non-magnetic metering filtering device of the intelligent water meter further includes a warning module 6; the warning module 6 is connected with the main control module 1, and the warning module 6 is in communication connection with external communication equipment through Bluetooth or WIFI; the data collected by the main control module 1 is compared and analyzed with the normal data through the warning module 6, and the abnormal water consumption condition of the user is fed back to the external communication equipment and an alarm is given. The external communication equipment can adopt a mobile phone, a tablet, a computer and the like, the utility model is not limited, whether the abnormal water consumption condition exists in the user or not is displayed through the external communication equipment, for example, the normal data and the data collected by the main control module 1 can be early warned according to the water consumption habit of the solitary old people, and the safety problem of the solitary old people is solved.
Specifically, in this embodiment, the main control module 1 may turn on or turn off the primary coil excitation module 3 through the control module 2 by using different sampling frequencies, where the sampling frequency F includes a first sampling frequency F1, a second sampling frequency F2, and a third sampling frequency F3, the first sampling frequency F1 is 0HZ to 10HZ, and in this embodiment, the first sampling frequency F1 is preferably 10 HZ; the second sampling frequency F2 is 10HZ to 20HZ, and in this embodiment, the second sampling frequency F2 is preferably 20 HZ; the third sampling frequency F3 is greater than 20HZ, and in this embodiment, the third sampling frequency F3 is preferably 65 HZ. The first sampling frequency F1 pairsThe flow rate range is 0m3/h-2m3H; the flow rate interval corresponding to the second sampling frequency F2 is 2m3/h-4m3H; the flow rate interval corresponding to the third sampling frequency F3 is 4m3/h-9m3H; according to the flow intervals corresponding to different sampling frequencies, the sampling frequency can be adjusted in real time, so that the water consumption measurement in different flow intervals is adapted, and more application scenes are met.
Referring to fig. 2, the utility model provides a non-magnetic metering filter device of an intelligent water meter, wherein the filtering method of the non-magnetic metering filter device of the intelligent water meter comprises the following steps:
s1, the main control module 1 starts the primary coil excitation module 3 through the control module 2 at a sampling frequency F to generate an excitation signal, and the acquisition module 5 acquires an actual AD value in at least one period in an excitation state;
s2, the main control module 1 closes the primary coil excitation module 3 through the control module 2 at a sampling frequency F, no excitation signal is generated, and the acquisition module 5 acquires an actual AD value in at least one period in a non-excitation state;
s3, calculating the slope between every two adjacent base points of the actual AD values collected in the excitation state and the non-excitation state respectively;
s4, predicting an estimated AD value corresponding to the next period according to the slope in the excitation state obtained in the step S3;
s5, the main control module 1 judges whether interference exists according to the change condition of the slope of the actual AD value in the non-excitation state between two adjacent base points in the corresponding period range;
if yes, filtering the actual AD value of the same sampling period in the excitation state, replacing the actual AD value with the corresponding estimated AD value, and executing the step S6;
if not, go to step S6;
s6, the main control module 1 adjusts the sampling frequency F by detecting the change of the actual AD slope in the excitation state.
Specifically, in this embodiment, the sampling speed of the acquisition module 5 is greater than the rotation speed of the metal disc of the intelligent water meter, so that two adjacent base points of the actual AD value in the same sampling period can be approximately regarded as a linear relationship, and the slope between the adjacent base points of the actual AD value does not change suddenly without interference. An AD value slope pre-judging mechanism is added, the control module 2 is used for starting and closing the generation of excitation signals of the primary coil excitation module 3, the acquisition module 5 is used for acquiring actual AD values in the starting and closing states, namely in the excitation state and the non-excitation state, in the same sampling period, and the main control module 1 is used for calculating the slope between every two adjacent base points of the actual AD values; and closing the primary coil excitation module 3, judging whether the environment has interference according to whether the AD value in a non-excitation state changes suddenly, if so, filtering the actual AD value in the excitation state in the same sampling period, replacing the actual AD value by the estimated AD value to realize filtering, and further adjusting the sampling frequency F according to the change condition of the slope in the excitation state.
Specifically, in this embodiment, the main control module 1 starts the primary coil excitation module 3 through the control module 2 with an initial frequency F, that is, a first sampling frequency F1, the primary coil excitation module 3 starts to work, generates an excitation signal and acts on the secondary coil induction module, the secondary coil induction module generates an induction signal, the induction signal is an induced current, the induction signal is attached to the processing module 4, the acquisition module 5 acquires an actual AD value of the processing module 4 in at least one period, the AD value is a voltage value, and a rotation angle of the metal disc of the intelligent water meter affects a change of the induced current, so as to affect a voltage signal generated by the capacitor unit 43 under the same discharge condition, where the voltage signal is a sine wave. Therefore, by turning on the primary coil excitation module 3, the actual AD value in the excited state is acquired.
Specifically, in this embodiment, the main control module 1 turns off the primary coil excitation module 3 through the control module 2 at an initial frequency, i.e., the first sampling frequency F1, no excitation signal is generated, the primary coil does not operate, the secondary coil induction module does not have an excitation signal from the primary coil excitation module 3, and the collection module 5 collects an actual AD value of the capacitance unit 43 in a non-excitation state for at least one period.
Specifically, in this embodiment, the main control module 1 calculates a slope between every two adjacent base points of the actual AD value collected in the excitation state and the non-excitation state, and predicts the AD value of the next cycle according to the slope in the excitation state; the method comprises the steps that a main control module 1 judges whether interference exists according to the slope between two adjacent base points of an AD value in a non-excitation state, if the slope between the two base points of the AD value in the non-excitation state is changed greatly, the main control module 1 judges that the interference exists, the induced current of a secondary coil induction module is influenced by the existence of a radio frequency signal, so that the slope of the AD value of a capacitor module is changed, the actual AD value in the excitation state of the same sampling period should be filtered, the estimated AD value in the same sampling period is predicted by using the slope of the AD value in the excitation state to replace the estimated AD value, the replaced estimated AD value is the filtered AD value, and after filtering is completed, the main control module 1 detects the change of the slope of the AD value in the excitation state; if the slope between two adjacent base points of the AD value has no obvious change in the non-excitation state, the change of the slope of the AD value in the excitation state is further detected by the main control module 1.
Specifically, in this embodiment, if the slope of the actual AD value is smaller than a first threshold K1, and the first threshold K1 is 2, a first sampling frequency F1 is continuously adopted, where the first sampling frequency F1 is 0HZ to 10HZ, and in this embodiment, the first sampling frequency F1 is preferably 10HZ, and the foregoing steps are performed; if the slope of the actual AD value is greater than or equal to a first threshold K1, the first threshold K1 is 2, and is smaller than a second threshold K2, and the second threshold K2 is 4, the main control module 1 periodically acquires actual values in an excited state and a non-excited state using a frequency-converted second sampling frequency F2, where the second sampling frequency F2 is 10HZ to 20HZ, in this embodiment, the second sampling frequency F2 is preferably 20HZ, calculates a slope between two adjacent base points of the actual AD value in the excited state and the non-excited state, predicts the AD value of the next period according to the slope, that is, a predicted AD value, and if the slope between two adjacent base points of the actual AD value in the non-excited state in a corresponding period range has a large change, the main control module 1 determines that interference exists, filters the same actual AD value in the excited state, and uses the predicted AD value instead of the actual AD value, the estimated AD value is the filtered AD value, and after filtering is realized, the change of the slope of the actual AD value in an excitation state is detected by the main control module 1 to adjust the sampling frequency F; if the slope between each two adjacent base points of the actual AD value in the non-excitation state has no obvious change, the sampling frequency F is further adjusted by detecting the change of the slope of the actual AD value in the excitation state through the main control module 1.
Specifically, if the slope of the actual AD value is greater than or equal to a second threshold K2, where the second threshold K2 is 4, the main control module 1 periodically collects the actual AD value in the excitation state and the non-excitation state by using a frequency-converted third sampling frequency F3, where the third sampling frequency F3 is greater than 20HZ, and in this embodiment, the third sampling frequency F3 is preferably 65 HZ; then, further calculating the slope between every two adjacent base points of the actual AD value acquired in the excitation state and the non-excitation state, predicting the AD value of the next period according to the slope in the excitation state, namely predicting the AD value, if the slope between the two base points of the actual AD value in the non-excitation state is greatly changed, judging that interference exists by the main control module 1, filtering the actual AD value of the same period in the excitation state, replacing the actual AD value with the predicted AD value, wherein the predicted AD value is the filtered AD value, and after filtering is realized, adjusting the sampling frequency F by detecting the change of the slope of the actual AD value in the excitation state by the main control module 1; if the slope between two adjacent base points of the actual AD value in the non-excitation state has no obvious change, the sampling frequency F is further adjusted by detecting the change of the slope of the actual AD value in the excitation state through the main control module 1.
Specifically, in this embodiment, the first sampling frequency F1 is 0HZ to 10HZ, the first sampling frequency F1 is preferably 10HZ, and the corresponding flow interval is 0m3/h-2m3H; the second sampling frequency F2 is 10HZ-20HZ, the second sampling frequency F2 is preferably 20HZ, and the corresponding flow interval is 2m3/h-4m3H; the third sampling frequency F3 is greater than 20HZ, the third sampling frequency F3 is preferably 65HZ, and the corresponding flow interval is 4m3/h-9m3H; the main control module 1 detects the change condition of the slope between every two adjacent base points of the actual AD value in the excitation state, and adjusts the sampling frequency according to the slope, thereby adapting to the water consumption measurement in different flow intervals to be full ofMore application scenarios are sufficient.
Specifically, in this embodiment, as shown in fig. 3, a represents an actual AD value curve acquired by the non-magnetic water meter without interference, and b represents a slope estimated AD value curve, as shown in fig. 4 and 5, the AD value of a part of the sampling period in the non-excited state is intercepted, which respectively represents the oscillograms of the actual AD value in the non-excited state under the interference condition and the non-interference condition, and the sampling speed of the acquisition module 5 is greater than the rotation speed of the metal disk of the smart water meter, so that in a shorter sampling period, two adjacent base points of the actual AD value can be approximately regarded as a linear relationship. The method comprises the steps of predicting an estimated AD value of a next period by calculating the slope between two adjacent base points of an AD value collected in an excitation state and a non-excitation state, judging whether interference exists or not through a main control module 1 according to the change condition of the slope between every two adjacent base points of the actual AD value in the non-excitation state in a corresponding period range, filtering the actual AD value in the same sampling period in the excitation state if the interference exists, and replacing the estimated AD value with the actual AD value, wherein as shown in figure 3, the curve goodness of fit between the AD value after filtering and the actual AD value of the intelligent water meter under the condition of no interference is good, the interference of NB-IoT in the environment can be effectively inhibited, and the problem that the water of the intelligent water meter is measured by mistake due to the interference of NB-IoT is avoided.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a no magnetism measurement filtering equipment of intelligence water gauge which characterized in that includes:
the device comprises a main control module, a primary coil excitation module, a processing module and an acquisition module;
the main control module is respectively connected with the control module, the primary coil excitation module, the processing module and the acquisition module and is used for turning on or turning off the primary coil excitation module through the control module at a sampling frequency F;
the control module is connected with the primary coil excitation module and used for turning on or off the primary coil excitation module;
the primary coil excitation module is connected with the processing module and used for generating an excitation signal and acting on the processing module;
the processing module is connected with the acquisition module and used for receiving and processing the excitation signal to generate a voltage signal;
and the acquisition module is used for acquiring the voltage signal generated by the processing module, converting the voltage signal into an AD value and transmitting the AD value to the main control module.
2. The nonmagnetic metering and filtering equipment of an intelligent water meter according to claim 1, wherein the processing module comprises:
the secondary coil induction unit, the discharge control unit and the capacitor unit are connected in sequence;
the secondary coil induction unit is used for generating an induction signal and acting on the discharge control unit;
the discharge control unit is used for detecting the induction signal, performing discharge processing on the induction signal and transmitting the induction signal to the capacitance unit;
the capacitance unit is used for receiving the induction signal and generating a voltage signal.
3. The nonmagnetic metering and filtering device of an intelligent water meter according to claim 1, wherein the master control module is connected with the discharge control unit and used for synchronously starting the discharge control unit.
4. The intelligent water meter non-magnetic metering filter equipment according to claim 3, wherein the intelligent water meter non-magnetic metering filter equipment further comprises a warning module;
the warning module is respectively connected with the main control module and the external communication equipment;
and the warning module is used for comparing and analyzing the data acquired by the main control module with the normal data, and feeding back the abnormal water consumption condition of the user to the external communication equipment and giving an alarm.
5. The non-magnetic metering and filtering device of the intelligent water meter according to claim 1, wherein the collection module is an analog-to-digital converter, and the collection module collects the voltage signal generated by the capacitor unit in an ADC mode.
6. The non-magnetic metering and filtering device of the intelligent water meter according to claim 5, wherein the sampling speed of the acquisition module is greater than the rotation speed of the metal disc of the intelligent water meter.
7. The non-magnetic metering filter equipment of the intelligent water meter according to claim 1, wherein the sampling frequency F comprises a first sampling frequency F1, a second sampling frequency F2 and a third sampling frequency F3.
8. The non-magnetic metering and filtering device of an intelligent water meter according to claim 7, wherein the first sampling frequency F1 is 0Hz-10 Hz.
9. The non-magnetic metering and filtering device of an intelligent water meter according to claim 7, wherein the second sampling frequency F2 is 10Hz-20 Hz.
10. The non-magnetic metering and filtering device of an intelligent water meter according to claim 7, wherein the third sampling frequency F3 is greater than 20 HZ.
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