Gas meter tamper detection method and detection system

Abstract

The invention relates to the technical field of natural gas use monitoring, in particular to a gas meter tamper detection method and system. The method mainly comprises the following steps: fixing the acceleration detection unit; inputting a preset acceleration reference value M; the acceleration detection unit collects a plurality of groups of acceleration first data K1 and sends the data to the controller; the controller calculates to obtain a first judgment value N and compares the first judgment value N with a preset acceleration reference value M; if the first judgment value N is larger than the preset acceleration reference value M, multiple sets of acceleration second data K2 are collected again, the acceleration second data K2 are converted into an angle target value g, then the angle target value g and an angle threshold value G are compared, and if the angle target value g is larger than the angle threshold value G, a meter dismounting alarm signal is generated. According to the method, unavoidable watch body vibration caused by watch dismounting can be accurately detected, the watch dismounting behavior is identified according to the vibration, and the alarm device can be prevented from being mistakenly triggered in a non-watch-dismounting scene.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas usage monitoring, and in particular to a gas meter disassembly prevention detection method and a detection system. Background Art

[0002] As a clean energy, natural gas is an indispensable power in urban life and production. With the steady development of urban gas transmission and distribution infrastructure, urban gas pipelines have become a key component of modern urban infrastructure. At present, most users abide by the regulations to use natural gas, but there are still a few users who privately dismantle the meter after installing the gas metering equipment and directly connect the gas pipeline for use. This behavior constitutes an infringement on the legitimate rights and interests of the gas company. This illegal operation not only causes economic damage to the gas supply company, but also hides major safety risks in the process of illegally dismantling the meter and unauthorized connection of gas. The operation of dismantling the meter will cause gas leakage and may even cause dangerous accidents such as explosions, which seriously threatens personal and public safety. Therefore, ensuring the normal operation of the gas meter is not only the basis for maintaining the reasonable distribution of energy.

[0003] At present, natural gas companies use tilt sensors on gas meters to detect whether the meter has been disassembled. When a certain tilt angle is detected, the meter sends a corresponding alarm message. For example, the Chinese patent document with publication number CN219368837U discloses an NB-IoT water meter with installation detection and anti-disassembly alarm, which achieves the anti-disassembly detection function through a built-in angular displacement sensor.

[0004] However, in the above scheme, the judgment result of the angular displacement sensor is the only judgment condition for whether to trigger the alarm. In real applications, when the gas company's operation and maintenance personnel are checking for gas leaks in the gas meter connection pipeline, they will slightly twist the meter body or press buttons. At this time, the anti-tampering meter judgment method based on the angle is likely to cause false triggering, thus affecting the normal work of the operation and maintenance personnel. Summary of the invention

[0005] The purpose of the present invention is to provide a gas meter anti-disassembly detection method and detection system, which can accurately detect the inevitable vibration of the meter body caused by meter disassembly, identify the meter disassembly behavior based on the vibration, and avoid the alarm device from being triggered by mistake in non-meter disassembly scenarios. It has the advantages of more scientific logic and stronger detection effectiveness, and can be applied to the detection of various types of gas meters and meter disassembly methods, thereby effectively protecting the personal safety of users and the property safety of gas companies.

[0006] In order to achieve the above object, the specific technical scheme of the present invention is as follows: A gas meter anti-tampering detection method, characterized in that the method comprises: S01, fixing the acceleration detection unit inside the gas meter casing and connecting it to the controller of the gas meter; S02, inputting a preset acceleration reference value M; the acceleration detection unit continuously samples, collects multiple sets of acceleration first data K1 and sends them to the controller; the controller calculates and obtains a first judgment value N according to the multiple sets of acceleration first data K1; S03, comparing the numerical values ​​of the preset acceleration reference value M and the first judgment value N; if the first judgment value N is greater than the preset acceleration reference value M, re-collecting multiple sets of second acceleration data K2, and converting the second acceleration data K2 into the angle target value g; if the first judgment value N is less than the preset acceleration reference value M, no action is taken; S04. The controller automatically compares the numerical values ​​of the angle target value g and the angle threshold value G; if the angle target value g is greater than the angle threshold value G, a meter disassembly alarm signal is generated; if the angle target value g is less than the angle threshold value G, no action is taken.

[0007] Therefore, when the initial installation is completed, the acceleration detection unit and the controller are fixed inside the case of the gas meter to make them rigidly connected, so that the vibration of the case can be directly transmitted to the acceleration detection unit, and the acceleration data is obtained by the acceleration detection unit.

[0008] When the gas meter is in normal operation, considering factors such as occasional vibration transmission of the remote pipeline or valve operation vibration, the preset acceleration reference value M of the gas meter will not be completely equal to 0. Its parameters are stored in the storage unit of the controller, which are preset parameters obtained by empirical method or engineering experiment method. In addition, the controller also includes a calculation unit and a cache unit, which can cache the acceleration pre-data k and calculate it. The calculation method can be average value calculation or weight value calculation. The preset acceleration reference value M represents the initial acceleration value of the gas meter when it is in normal operation.

[0009] Since the gas meter has a protective shell, and nonlinear external forces will be applied to the shell when the meter is removed, the vibration caused by the demolition action when the meter is removed will be significantly different from maintenance or occasional vibrations. During maintenance, since the staff have received professional training, their movements will not be too large, and thus will not cause acceleration changes to the gas meter that exceed the preset acceleration reference value M. When there is a real meter removal behavior, since it involves the use of demolition tools and the use of sudden force, the acceleration detection unit will inevitably be triggered. When the demolition vibration is transmitted to the gas meter, the vibration on the gas meter shell is directly transmitted to the acceleration detection unit, and the acceleration detection unit will obtain multi-directional acceleration data from the vibration. Specifically, for example, 30 sets of acceleration first data K1 are collected and all data are sent to the controller; the controller calculates the first judgment value N based on the 30 sets of acceleration first data K1.

[0010] Then the first judgment is made, that is, the controller automatically compares the numerical values ​​of the preset acceleration reference value M and the first judgment value N; if the first judgment value N is greater than the preset acceleration reference value M, the acceleration detection unit re-collects 30 sets of acceleration second data K2, and converts the acceleration second data K2 into the angle target value g. Specifically, since the acceleration detection unit is composed of a three-axis acceleration sensor and an auxiliary circuit, the acceleration data collected by it can reflect the characteristics of acceleration in three dimensions. It is well known to those skilled in the art that acceleration is the derivative of velocity, and velocity is the derivative of displacement. Therefore, the angle target value g can be obtained by solving the differential equation. After obtaining the angle target value g, the controller will automatically compare the numerical values ​​of the angle target value g and the angle threshold value G. The parameter implementation of the angle threshold value G is stored in the storage unit of the controller, which is a preset parameter obtained by the empirical method or engineering experiment method. If the angle target value g is greater than the angle threshold value G, it means that the meter disassembly behavior has indeed occurred in the state of the angle tilt, and the controller generates a meter disassembly alarm signal. If the angle target value g is less than the angle threshold value G, it means that the extremely slight angle tilt caused by the vibration is within the normal environmental error range, so no meter removal alarm signal is issued.

[0011] On the other hand, if the first determination value N is less than the preset acceleration reference value M, the acceleration detection unit re-enters a low-power sleep state without performing additional actions.

[0012] In summary, by setting an acceleration detection unit in the gas meter, and having the acceleration detection unit make a judgment in the acceleration dimension, it is determined whether to make a subsequent angle judgment. If necessary, the angle target value g can be calculated and obtained and a secondary judgment can be made without setting an additional angular displacement sensor, thus overcoming the problem that the angular displacement sensor in the prior art is easily triggered by mistake. This method has more scientific logic and stronger detection effectiveness, and can be applied to the detection of various types of gas meters and meter disassembly methods, thereby effectively protecting the personal safety of users and the property safety of gas companies.

[0013] As a preferred embodiment of the present invention, in S02, the method for obtaining the preset acceleration reference value M is specifically: the acceleration detection unit obtains multiple sets of acceleration pre-data k under normal working conditions, and sends the multiple sets of acceleration pre-data k to the controller; the controller calculates the average value based on the multiple sets of acceleration pre-data K to obtain the preset acceleration reference value M.

[0014] Thus, a specific method for setting the preset acceleration reference value M in the storage unit of the processor of the gas meter may be that when the gas meter is in the installation test state, the acceleration detection unit obtains multiple sets of acceleration pre-data k under the normal working state, and sends the multiple sets of acceleration pre-data k to the controller; the controller calculates the average value based on the multiple sets of acceleration pre-data K to obtain the preset acceleration reference value M. The preset acceleration reference value M obtained at this time combines the actual working state, and its value is more applicable and scientific than the empirical assignment method.

[0015] As a preferred embodiment of the present invention, after obtaining the reference acceleration value M, the acceleration detection unit enters a low power consumption state and reduces the sampling frequency; when the acceleration detection unit detects and identifies a vibration signal, the acceleration detection unit enters an activated working state and increases the sampling frequency.

[0016] Therefore, in order to save energy consumption of the gas meter in daily working state, a low power consumption state and working state are set. When the reference acceleration value M is entered, the acceleration detection unit will immediately enter the low power consumption state and reduce the sampling frequency, for example, below 12.5Hz. The low power consumption state is the state where the gas meter works normally and has not been broken into. When a vibration signal is triggered, the acceleration detection unit detects the vibration signal and will be automatically activated, thereby entering the activated working state and increasing the sampling frequency, for example, above 1000Hz. A higher sampling frequency can ensure that all vibration signals to be collected will not be missed, ensuring the accuracy of subsequent data calculations.

[0017] As a preferred embodiment of the present invention, in S02, before the controller calculates the first judgment value N according to the multiple groups of acceleration first data K1, it also includes a limiting filtering step: the controller filters the multiple groups of acceleration first data K1 and discards abnormal data.

[0018] Therefore, because the actual working environment of the gas meter is diverse, abnormal acceleration data caused by discrete factors may affect the calculation and judgment of the controller, such as incorrect key operation, etc. Such factors will cause the multiple groups of acceleration first data K1 collected by the acceleration detection unit within a period of time to have individual abnormal groups. Therefore, the controller obtains multiple groups of acceleration first data K1 and performs limiting filtering to eliminate abnormal group data and improve judgment accuracy.

[0019] As a preferred embodiment of the present invention, in S03, before converting the multiple sets of acceleration second data K2 into the angle target value g, it also includes a peak-to-peak value cycle judgment step: the controller judges whether the peak-to-peak value of the multiple sets of acceleration second data K2 falls within the peak-to-peak value threshold range; if so, the average value of the multiple sets of acceleration second data K2 is converted into the angle target value g; if not, the acceleration detection unit re-collects the multiple sets of acceleration data, repeats the peak-to-peak value cycle judgment step, until the angle target value g is obtained or the preset number of judgments is reached, and the acceleration detection unit re-enters the low power consumption state.

[0020] Therefore, before converting multiple sets of acceleration second data K2 into the angle target value g, a peak-to-peak value cycle judgment step is also included, and this step can perform additional peak-to-peak value judgment. Since the time domain waveform of the acceleration second data K2 can be obtained according to the multiple sets of acceleration second data K2, the peak-to-peak value cycle judgment can be performed according to the peak-to-peak value data in the figure. Even if the first judgment value N is greater than the preset acceleration reference value M, it is necessary to perform a peak-to-peak value cycle judgment on the new set of acceleration second data K2 collected. Only when the peak-to-peak value in the time domain waveform of the acceleration second data K2 falls within the peak-to-peak value threshold range, the controller will consider the acceleration second data K2 at this location as valid data, and then convert the average value of the multiple sets of acceleration second data K2 into the angle target value g. If it does not fall within, the collection and judgment are performed cyclically within the numerical range of the preset judgment times until the angle target value g is obtained; or it is cycled all the time, and after reaching the preset judgment times, it can be considered that the vibration has disappeared at this time, and the potential risk of disassembling the meter has disappeared, so that the acceleration detection unit re-enters the low power consumption state and waits for the next activation.

[0021] As a preferred embodiment of the present invention, in S02, the specific calculation method of the controller to obtain the first judgment value N based on multiple groups of acceleration first data K1 is a weighted average calculation method.

[0022] Therefore, multiple sets of first acceleration data K1 correspond to a period of collection time. The credibility of the data located near the middle moment during this period is more scientific and credible than the data at the start and end moments. Therefore, it is given a higher weight. By defining the weights of all the data in the multiple sets of first acceleration data K1 and calculating the entire weighted average value, the scientificity and accuracy of the first judgment value N can be improved.

[0023] A gas meter anti-disassembly detection system, characterized in that the system comprises: an acceleration detection unit, which is fixed inside the gas meter casing and is used to obtain acceleration data; it also comprises a controller, which is connected to the acceleration detection unit and is used to obtain acceleration data and perform calculations; the controller comprises a calculation unit and a storage unit; the calculation unit is used to obtain a first judgment value N and an angle target value g and to complete the comparison between the first judgment value N and a preset acceleration reference value M and the comparison between the angle target value g and an angle threshold value G; the storage unit is used to save the acquired acceleration data and the preset acceleration reference value M and the angle threshold value G.

[0024] Therefore, when the initial installation is completed, the acceleration detection unit and the controller are fixed inside the case of the gas meter to make them rigidly connected, so that the vibration of the case can be directly transmitted to the acceleration detection unit, and the acceleration data is obtained by the acceleration detection unit.

[0025] Under normal working conditions, the preset acceleration reference value M of the gas meter will not be completely equal to 0, taking into account factors such as occasional vibration transmission of the remote pipeline or valve operation vibration. Its parameters are stored in the storage unit of the controller and are preset parameters obtained by empirical method or engineering experimental method.

[0026] In addition, the controller also includes a calculation unit, which can calculate the acceleration pre-data k, obtain the first judgment value N and the angle target value g, and complete the comparison between the first judgment value N and the preset acceleration reference value M and the angle target value g and the angle threshold value G. The calculation method can be an average value calculation or a weighted value calculation. The preset acceleration reference value M represents the initial acceleration value of the gas meter when it is working normally.

[0027] When the vibration of the demolition is transmitted to the gas meter, the vibration of the gas meter case is directly transmitted to the acceleration detection unit, and the acceleration detection unit will obtain multi-directional acceleration data from the vibration. Specifically, 30 sets of acceleration first data K1 are collected and all the data are sent to the controller; the calculation unit of the controller calculates the first judgment value N based on the 30 sets of acceleration first data K1.

[0028] The calculation unit then makes the first judgment, that is, the controller automatically compares the numerical values ​​of the preset acceleration reference value M and the first judgment value N; if the first judgment value N is greater than the preset acceleration reference value M, the acceleration detection unit re-collects 30 sets of acceleration second data K2, and converts the acceleration second data K2 into the angle target value g. Specifically, since the acceleration detection unit is composed of a three-axis acceleration sensor and an auxiliary circuit, the acceleration data collected by it can reflect the characteristics of acceleration in three dimensions. It is well known to those skilled in the art that acceleration is the derivative of velocity, and velocity is the derivative of displacement, so the angle target value g can be obtained by solving the differential equation. After obtaining the angle target value g, the calculation unit will automatically compare the numerical values ​​of the angle target value g and the angle threshold value G. The parameter of the angle threshold value G is stored in the storage unit of the controller, which is a preset parameter obtained by the empirical method or engineering experiment method. If the angle target value g is greater than the angle threshold value G, it means that the meter disassembly behavior has indeed occurred in the state of the angle tilt, and the controller generates a meter disassembly alarm signal. If the angle target value g is less than the angle threshold value G, it means that the extremely slight angle tilt caused by the vibration is within the normal environmental error range, so no meter removal alarm signal is issued.

[0029] On the other hand, if the first determination value N is less than the preset acceleration reference value M, the acceleration detection unit re-enters a low-power sleep state without performing additional actions.

[0030] As a preferred embodiment of the present invention, the gas meter anti-disassembly detection system further comprises an alarm unit, which is connected to the controller and is used to receive a meter disassembly alarm signal and activate an audible and visual warning reminder.

[0031] The alarm unit can be a device such as a buzzer or a flashing LED light, which is connected to the controller. When the controller generates a meter removal alarm signal, the alarm unit receives the meter removal alarm signal and activates the sound and light warning reminder, so that the person removing the meter gives up the meter removal behavior under the sound and light warning, and can remind the surrounding people to discover the meter removal behavior in time.

[0032] In summary, the present invention has the following beneficial effects: By setting an acceleration detection unit in the gas meter, and having the acceleration detection unit make a judgment in the acceleration dimension, it is determined whether to make a subsequent angle judgment. If necessary, the angle target value g can be calculated and obtained and a secondary judgment can be made without setting an additional angular displacement sensor, thus overcoming the problem that the angular displacement sensor in the prior art is easily triggered by mistake. This method has more scientific logic and stronger detection effectiveness, and can be applied to the detection of various types of gas meters and meter disassembly methods, thereby effectively protecting the personal safety of users and the property safety of gas companies. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is a flow chart of the gas meter anti-tampering detection method; Figure 2 This is the system block diagram of the gas meter anti-tampering detection system. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Anyone can implement the present disclosure in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment".

[0036] like Figure 1 As shown, when the initial installation is completed, the acceleration detection unit and the controller are fixed inside the case of the gas meter to make them rigidly connected so that the vibration of the case can be directly transmitted to the acceleration detection unit, and the acceleration data is obtained by the acceleration detection unit.

[0037] Under normal working conditions of the gas meter, considering factors such as occasional vibration transmission of the remote pipeline or valve working vibration, the preset acceleration reference value M of the gas meter will not be completely equal to 0. Its parameters are stored in the storage unit of the controller, which are preset parameters obtained by empirical method or engineering experiment method. In addition, the method for obtaining the preset acceleration reference value M can also be that when the gas meter is in the installation test state, the acceleration detection unit obtains multiple sets of acceleration pre-data k under normal working conditions, and sends the multiple sets of acceleration pre-data k to the controller; the controller calculates the average value based on the multiple sets of acceleration pre-data K to obtain the preset acceleration reference value M. At this time, the preset acceleration reference value M obtained is combined with the actual working state, and its value is more applicable and scientific than the empirical assignment method.

[0038] Then, after obtaining the reference acceleration value M, the acceleration detection unit enters a low power consumption state and reduces the sampling frequency to 12.5Hz; when the acceleration detection unit detects and identifies a vibration signal, the acceleration detection unit enters an activated working state and increases the sampling frequency to 1000Hz. Then, the acceleration detection unit immediately performs continuous sampling, collects multiple sets of acceleration first data K1 and performs limiting filtering, and the controller filters the multiple sets of acceleration first data K1 and discards abnormal data. Then, the controller obtains the first judgment value N by weighted average calculation based on all valid acceleration first data K1; wherein, since the multiple sets of acceleration first data K1 correspond to a period of collection time, the credibility of the data located near the middle moment during this period is greater than the scientificity and credibility of the data at the start and end moments, so it is given a higher weight. By defining the weights of all the data in the multiple sets of acceleration first data K1 and calculating the entire weighted average value, the scientificity and accuracy of the first judgment value N can be improved.

[0039] Next, after obtaining the first judgment value N, the calculation unit in the controller compares the numerical values ​​of the preset acceleration reference value M and the first judgment value N; if the first judgment value N is greater than the preset acceleration reference value M, the acceleration detection unit re-collects multiple sets of acceleration second data K2, and if the first judgment value N is less than the preset acceleration reference value M, no action is taken. In the first case, after the acceleration detection unit re-collects multiple sets of acceleration second data K2, it enters the peak-to-peak value cycle judgment step. That is, the newly collected multiple sets of acceleration second data K2 are multiple sets of data within a period of time, which can be converted into a time domain diagram in the calculation unit, and the peak-to-peak value judgment is performed on the signal waveform in the time domain diagram. When the peak-to-peak values ​​of all waves fall within the peak-to-peak value threshold range, the multiple sets of acceleration second data K2 collected this time are recognized, and the angle target value g is calculated based on this; it is used to eliminate potential unreasonable posture errors caused by abnormal waveforms. If the above judgment process does not fall, the acceleration detection unit re-collects multiple sets of acceleration data K2, repeats the above peak-to-peak cycle judgment steps, until the angle target value g is obtained or the preset judgment times are reached, and the acceleration detection unit re-enters the low power consumption state. The peak-to-peak value threshold range value and the preset judgment times value are both stored in the storage unit of the controller in advance, and the calculation unit can access and read them at any time when needed.

[0040] After that, the step of obtaining the angle target value g is performed. Specifically, since the acceleration detection unit is composed of a three-axis acceleration sensor and an auxiliary circuit, the acceleration data collected by it can reflect the characteristics of acceleration in three dimensions. It is well known to those skilled in the art that acceleration is the derivative of velocity, and velocity is the derivative of displacement. Therefore, the angle target value g can be obtained by solving the differential equation. After obtaining the angle target value g, the controller will automatically compare the numerical values ​​of the angle target value g and the angle threshold value G. The parameters of the angle threshold value G are stored in the storage unit of the controller in advance, which are preset parameters obtained by empirical method or engineering experiment method. If the angle target value g is greater than the angle threshold value G, it means that the meter disassembly behavior has indeed occurred under the state of the angle tilt, and the controller generates a meter disassembly alarm signal. If the angle target value g is less than the angle threshold value G, it means that the extremely slight angle tilt caused by the vibration belongs to the influence within the normal environmental error, so the meter disassembly alarm signal is not issued. On the other hand, if the first judgment value N is less than the preset acceleration reference value M, the acceleration detection unit re-enters the low-power sleep state without performing additional actions.

[0041] like Figure 2 As shown, the present invention also discloses a gas meter anti-disassembly detection system, which includes an acceleration detection unit fixed inside the gas meter housing, which is used to obtain acceleration data; it also includes a controller connected to the acceleration detection unit, which is used to obtain acceleration data and perform calculations; the controller includes a calculation unit and a storage unit; the calculation unit is used to obtain a first judgment value N and an angle target value g and complete the comparison of the first judgment value N with a preset acceleration reference value M and the comparison of the angle target value g with an angle threshold value G; the storage unit is used to save the acquired acceleration data and the preset acceleration reference value M and the angle threshold value G; the system also includes an alarm unit, which is connected to the controller and is used to receive a meter disassembly alarm signal and activate an audible and visual warning reminder. The alarm unit can be a device such as a buzzer or a flashing LED light, which is connected to the controller. When the controller generates a meter disassembly alarm signal, the alarm unit receives the meter disassembly alarm signal and activates an audible and visual warning reminder, so that the meter disassembly person abandons the meter disassembly behavior under the audible and visual warning, and can remind the surrounding personnel to discover the meter disassembly behavior in time.

[0042] A number of embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A gas meter anti-tampering detection method, characterized in that the method include: S01, fixing the acceleration detection unit inside the gas meter casing and connecting it to the controller of the gas meter; S02, input the preset acceleration reference value M; The acceleration detection unit performs continuous sampling, collects multiple sets of first acceleration data K1 and sends them to the controller; The controller calculates and obtains a first judgment value N according to multiple sets of first acceleration data K1; S03, comparing the numerical values ​​of the preset acceleration reference value M and the first judgment value N; If the first judgment value N is greater than the preset acceleration reference value M, multiple sets of second acceleration data K2 are collected again, and the second acceleration data K2 are converted into an angle target value g; If the first judgment value N is less than the preset acceleration reference value M, no action is taken; S04. The controller automatically compares the numerical values ​​of the angle target value g and the angle threshold value G; if the angle target value g is greater than the angle threshold value G, a meter disassembly alarm signal is generated; if the angle target value g is less than the angle threshold value G, no action is taken.

2. A gas meter anti-disassembly detection method according to claim 1, characterized in that: In S02, the method for obtaining the preset acceleration reference value M is specifically as follows: the acceleration detection unit obtains multiple sets of acceleration prediction data k under normal working conditions, and sends the multiple sets of acceleration prediction data k to the controller; the controller calculates the average value based on the multiple sets of acceleration prediction data K to obtain the preset acceleration reference value M.

3. A gas meter anti-disassembly detection method according to claim 2, characterized in that: After obtaining the reference acceleration value M, the acceleration detection unit enters a low power consumption state and reduces the sampling frequency; when the acceleration detection unit detects and identifies a vibration signal, the acceleration detection unit enters an activated working state and increases the sampling frequency.

4. A gas meter anti-disassembly detection method according to claim 3, characterized in that: In S02, before the controller calculates the first judgment value N according to the multiple sets of acceleration first data K1, it also includes a limiting filtering step: the controller filters the multiple sets of acceleration first data K1 and discards abnormal data.

5. A gas meter anti-disassembly detection method according to claim 4, characterized in that: In the S03, before converting the multiple sets of second acceleration data K2 into the angle target value g, a peak-to-peak value cycle judgment step is also included: the controller judges whether the peak-to-peak values ​​of the multiple sets of second acceleration data K2 fall within the peak-to-peak value threshold range; if so, the average value of the multiple sets of second acceleration data K2 is converted into the angle target value g; If it does not fall within the range, the acceleration detection unit re-collects multiple sets of acceleration data and repeats the peak-to-peak value cycle judgment step until the angle target value g is obtained or the preset number of judgments is reached, and the acceleration detection unit re-enters the low power consumption state.

6. A gas meter anti-tampering detection method according to claim 5, characterized in that: In S02, the controller calculates the first judgment value N according to the multiple sets of acceleration first data K1 by a weighted average calculation method.

7. A gas meter anti-tampering detection system, characterized in that: The system comprises: an acceleration detection unit, which is fixed inside the gas meter casing and is used to obtain acceleration data; and a controller, which is connected to the acceleration detection unit and is used to obtain acceleration data and perform calculations; the controller comprises a calculation unit and a storage unit; the calculation unit is used to obtain a first judgment value N and an angle target value g and to complete a comparison between the first judgment value N and a preset acceleration reference value M and a comparison between the angle target value g and an angle threshold value G; and the storage unit is used to save the obtained acceleration data and the preset acceleration reference value M and the angle threshold value G.

8. A gas meter anti-tampering detection system according to claim 7, characterized in that: The gas meter anti-disassembly detection system also includes an alarm unit, which is connected to the controller and is used to receive a meter disassembly alarm signal and activate an audible and visual warning reminder.

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