CN107884020A - A kind of low-power consumption gauge table and its system using NB IoT frameworks - Google Patents
A kind of low-power consumption gauge table and its system using NB IoT frameworks Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
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- 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
- G01F15/061—Indicating or recording devices for remote indication
- G01F15/063—Indicating or recording devices for remote indication using electrical means
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/06—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity with means for prepaying basic charges, e.g. rent for meters
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The invention provides a kind of low-power consumption gauge table and its system using NB IoT frameworks.Low-power consumption NB IoT metering meter terminals include：Master controller, power-supply system, function of measuring module, valve control module and NB IoT communication modules；The metering meter terminal employs the wireless communication section based on NB IoT agreements and has low power dissipation design, being capable of highly reliable, carry out network insertion that cost is low, realize the bidirectional data interaction of metering meter terminal and long-range bill management plateform, especially by the power-supply system specially designed, the power consumption of metering meter terminal can further be reduced, greatly extend stand-by time, reduce the number for changing battery.
Description
Technical Field
The invention relates to the field of metering, in particular to a low-power consumption meter system applying an NB-IoT architecture.
Background
The management, charging and data statistics of water, electricity, gas and heat supply can not be separated from various meters. The traditional single meter is basically eliminated at present, the existing meter has a communication function, can be accessed into a network in a wired or wireless way, and can realize remote meter reading, online inquiry and payment and various background statistical management functions. The meter system is an important component of the technology of the Internet of things, and has positive significance for building a widely-covered Internet of things system in the future.
The meter system deployed wirelessly belongs to the low-speed Internet of things service category, namely the transmission rate is within 100Kbps, text type information transmission is mainly used, the data flow is not high, and the meter system has strong low power consumption requirements. At present, a suitable cellular technology is lacked for the application of a low-rate Internet of things, and the conventional meter system mainly adopts a GPRS communication mode to realize access networking. However, the power consumption of the terminal in the GPRS communication mode is too high, and the standby time of a battery of 5wh is about 2 months; indoor signals are not well covered, and special leading-out antennas are needed; the access capacity is limited, and the accommodation capacity of a base station is always easy to catch when a large amount of meter equipment in a cell is met.
In order to meet the requirements of low power consumption and wide-area coverage of the Internet of things, the NB-IoT (Narrow Band Internet of things) standard is produced; by 2016, 5 months, 3GPP has completed the formulation of the NB-IoT standard core part. NB-IoT is a narrowband cellular communication technology, and as a technology applied to low-rate traffic, NB-IoT has advantages in the following aspects: (1) super strong access capability: with the same base station, NB-IoT can provide 50-100 times the number of accesses over existing wireless technologies; one sector can support 10 ten thousand connections, and support low delay sensitivity, ultra-low equipment cost, low equipment power consumption and optimized network architecture. For example, limited by bandwidth, an operator only opens 8-16 access ports to each router in a home, and often there are multiple mobile phones, notebooks, and tablet computers in a home, so that it is a difficult problem to implement whole-house intelligence and networking of hundreds of sensing devices in the future, and NB-IoT is enough to easily meet the networking demand of a large number of devices in a smart home in the future. (2) High coverage: the NB-IoT indoor coverage capability is strong, the gain is improved by 20dB compared with that of LTE, and the capability of the coverage area is improved by 100 times. The system can meet the wide coverage requirement of rural areas, and is also applicable to the applications of factories, underground garages and well covers with requirements on deep coverage. (3) Low power consumption: the low power consumption characteristic is an important index of the application of the Internet of things, and particularly for some devices and occasions where batteries cannot be replaced frequently, such as various sensing and monitoring devices arranged in remote areas of mountain wildlands, the devices and the occasions cannot be charged like smart phones one day, and the service life of the batteries as long as several years is the most essential requirement. NB-IoT focuses on small data volume, low rate applications, so NB-IoT device power consumption can be made very small, and device endurance can be greatly increased from the past months to years. (4) The cost is low: compared to LoRa, NB-IoT does not need to re-network, and both radio frequency and antenna are essentially multiplexed. Taking china mobile as an example, a relatively wide frequency band is in 900MHZ, and simultaneous deployment of LTE and NB-IoT can be directly performed only by clearing a part of 2G frequency bands. Low speed, low power consumption, low bandwidth also bring low cost advantages to NB-IoT chips and modules.
Therefore, if the NB-IoT technology is applied to the meter system, the huge advantages of the technology can be exerted, the access capacity of the meter system is expanded, the indoor signal coverage condition is improved, and particularly, the power consumption of the meter terminal is reduced.
Disclosure of Invention
Technical problem to be solved
In view of the above-mentioned needs in the prior art, the present invention provides a low power consumption meter and system thereof applying NB-IoT architecture. The meter terminal of the system adopts the wireless communication part based on the NB-IoT protocol and has low power consumption design, network access can be performed with high reliability and low cost, bidirectional data interaction between the meter terminal and the remote charging management platform is realized, especially, the power consumption of the meter terminal can be further reduced, the standby time is greatly prolonged, and the times of battery replacement are reduced. On the basis of wireless communication based on an NB-IoT protocol, the system can support rich online operation and functional applications.
(II) technical scheme
The invention relates to a low-power consumption NB-IoT meter terminal, which is characterized by comprising the following components: the device comprises a main controller, a power supply system, a metering function module, a valve control module and an NB-IoT communication module; wherein,
the main controller is connected with a power supply system through a power supply control pin, and controls the on-off state of the power supply system to the NB-IoT communication module and/or the valve control module through the power supply control pin;
the NB-IoT communication module realizes the uplink and downlink communication of the meter terminal based on an NB-IoT communication mode.
Preferably, the power supply system comprises a first power supply output end and a second power supply output end, wherein the first power supply output end is used for supplying power to the main controller; the second power supply output end is used for supplying power to the NB-IoT communication module and/or the valve control module; and controlling the on and off of the power supply of the second power supply output end according to the state of the power supply control pin.
Preferably, the power supply system includes a main battery interface and a backup battery circuit, and both the main battery interface and the backup battery circuit output power through the first power supply output terminal.
Preferably, the power supply system comprises a battery voltage sampling circuit for sampling the voltage of the main battery, and the main controller controls the on and off of the power supply to the battery voltage sampling circuit through a sampling control pin; the main controller obtains the sampling voltage of the battery voltage sampling circuit through the voltage sampling pin so as to judge the voltage condition of the main battery.
Preferably, the meter terminal uploads the metering value obtained by the metering function module, the battery state sampled by the power supply module and the valve state provided by the valve control module through the NB-IoT communication module, and obtains a downlink valve control command.
Preferably, the meter terminal further comprises at least one of the following components: display screen, touch button, temperature detection module. Further preferably, the temperature detection module uploads the in-table temperature data through the NB-IoT communication module.
Preferably, the valve control module includes: a direct current motor and a motor forward and reverse rotation driving circuit; the motor forward and reverse rotation driving circuit controls the current direction input to the direct current motor according to a motor driving pin of the main controller, so that the direct current motor is controlled to rotate forward or reversely; the valve control module further comprises: the motor sampling interface is used for providing sampling signals for the motor state of the main controller by adopting pins; and the valve in-place signal interface is used for providing a switch signal for indicating that the valve is in place for a valve state input pin of the main controller.
Preferably, the metering function module comprises a reluctance switch metering submodule and an air theft detection submodule.
The invention further provides a low-power consumption NB-IoT metering system, which is characterized by comprising:
the low-power consumption NB-IoT meter terminal is used for uploading the metering value, the battery state and the valve state of the meter terminal based on the NB-IoT communication function and obtaining a downlink valve control instruction;
an NB-IoT information post office comprising an NB-IoT base station and an NB-IoT management server; the NB-IoT base station provides wireless signal coverage for the low-power consumption NB-IoT meter terminal to realize network access; the NB-IoT management server manages the total usage and balance of the user based on the metering data uploaded by the NB-IoT meter terminal, automatically monitors the state data of the NB-IoT meter terminal and realizes a big data analysis function.
And the man-machine interaction system sends a prompt message to the user according to the data of the NB-IoT management server to prompt that the stored value is insufficient or the battery power is insufficient, and realizes the online service function.
Preferably, the big data analysis function of the NB-IoT management server includes: extracting metering data recorded in the time interval by all users in the NB-IoT management server responsible area; automatically classifying the metering data into a plurality of mode clusters; counting the average value of the metering data of each mode cluster, and determining the type of the mode cluster where each user is located according to the classification standard; and pushing a prompt related to the mode cluster type of each user to the user by the man-machine interaction system according to the cluster type of each user.
Preferably, the specific method for automatically classifying the metering data recorded by all users in a time interval into a plurality of pattern clusters includes: extracting the metering data recorded in the time interval by all n users in the area charged by the NB-IoT management server as Ei-n,Ei-n+1...,Ei(ii) a Presetting to classify the users into k mode clusters, randomly selecting k values from the metering data of n users as initial cluster centers, and calculating as Ec1,Ec2,......,Eck(ii) a Calculation of Ei-n,Ei-n+1...,EiEach of the measured data and Ec1,Ec2,......,EckDistance value of each cluster center in the clusterVi-Ck＝|Ei-EckL, |; will Ei-n,Ei-n+1...,EiEach metering data in Ec1,Ec2,......,EckThe cluster to which the cluster center closest to the cluster center belongs; then, recalculating the cluster center of each cluster, wherein the recalculated cluster center is the metering data closest to the average value of the metering data values of each cluster; then calculate Ei-n,Ei-n+1...,EiAnd E is calculated according to the distance value of each measured data and the recalculated cluster centeri-n,Ei-n+1...,EiEach metering data in the cluster is redistributed to the cluster to which the cluster center closest to the metering data belongs; then updating the clustering center again; and iterating the processes until the cluster center is not changed after updating.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the low-power consumption NB-IoT meter terminal uploads time and the measured values of gas and water based on an NB-IoT communication technology, and provides basic data for step price calculation; the temperature, the battery state, the valve state and the like in the gas meter are uploaded, and the automatic state monitoring of the gas meter is realized; the remote control valve can receive a valve opening and closing instruction issued remotely to control the state of the valve. The low-power consumption NB-IoT meter terminal has a specially designed low-power consumption structure, the main controller controls the power supply of the NB-IoT communication module, the valve driving circuit, the battery voltage detection and other components, and the power supply is cut off when the components are not applied, so that the power consumption is thoroughly saved. Based on NB-IoT communication technology, the invention establishes a background system with rich functions through an NB-IoT information post office and a human-computer interaction system (HCI), supports big data analysis, can realize functions of prepayment, post prepayment, online payment, mobile phone payment and the like, and has the alarm functions of prompting a user to pay by short messages or WeChat, replacing batteries and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a low power consumption meter system using NB-IoT architecture according to the present invention;
FIG. 2 is a block diagram of the overall structure of the low power consumption NB-IoT meter terminal of the present invention;
FIG. 3 is a circuit diagram of a main controller of the low power consumption NB-IoT meter terminal of the present invention;
FIG. 4 is a schematic diagram of a power system circuit of the low power consumption NB-IoT meter terminal of the present invention;
FIG. 5 is a schematic circuit diagram of a metering function module of the low power consumption NB-IoT meter terminal according to the present invention;
FIG. 6 is a schematic circuit diagram of a valve control module of the low power consumption NB-IoT meter terminal of the present invention;
fig. 7 is a circuit diagram of an NB-IoT communication module of the low power consumption NB-IoT meter terminal according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of the overall structure of a low power consumption meter system applying NB-IoT architecture according to the present invention. The system includes a low power consumption NB-IoT meter terminal, an NB-IoT information post office (MPO), and a human-computer interaction system (HCI).
The low-power consumption NB-IoT meter terminal has NB-IoT communication function and low-power consumption design, and has the functions of data metering, valve control, numerical value display, touch key-press and the like. The specific structure and function of the low power consumption NB-IoT meter terminal is described in detail below.
The NB-IoT information Post Office (MPO) is set up by an operator, is an information transmission system based on an NB-IoT protocol, and plays a role of a bridge for information transmission between an NB-IoT meter terminal and a human-computer interaction system (HCI). The NB-IoT information post office comprises an NB-IoT base station and an NB-IoT management server. The NB-IoT base station provides wireless signal coverage for the cell, and the NB-IoT meter terminal realizes network access according to the NB-IoT protocol. The NB-IoT management server is a remote platform for realizing background management and online service of the meter system; the NB-IoT management server manages the total water, electricity and gas consumption and balance of a user based on metering data uploaded by the NB-IoT meter terminal, provides basic data for tiered pricing, realizes service functions of prepayment, post-payment, online payment, mobile phone payment and the like, and provides a basis for big data analysis by accumulating technical data; automatically monitoring state data of an NB-IoT meter terminal, wherein the state data comprises a battery state, a valve state, a temperature in a meter and the like; the NB-IoT management server can be communicated with a mobile phone of a user or a manager and can send prompt information to the mobile phone of the user or the manager, for example, an alarm of insufficient stored value balance or insufficient battery capacity of a meter is sent to the user in a short message, WeChat or other forms; the NB-IoT management server may also remotely control meter terminals, such as controlling the opening and closing of valves.
A Human-computer interaction (HCI) is a software and hardware system that realizes information interaction, information processing, and information service between a person and an NB-IoT management server in an NB-IoT information post office. The aim is to enable a user or a manager to utilize equipment such as a general computer (PC), a tablet personal computer and a mobile phone to acquire data of a low-power consumption NB-IoT meter terminal through an NB-IoT information post office MPO and to realize functions such as control of the terminal.
The architecture of the low-power consumption NB-IoT meter terminal is shown in FIG. 2 and comprises a main controller 1, a power supply system 2, a metering function module 3, a valve control module 4, a display screen 5, an NB-IoT communication module 6, a touch key 7 and a temperature detection module 8.
Referring to fig. 3, the main controller 1 adopts an enzhipu MKL36 type Microcontroller (MCU) chip, which is a low-power mixed signal ARM Cortex-M4 processor, and has the characteristics of ultra-low power consumption, convenient application design, good expansibility, complete series of varieties, and the like. The MCU has a plurality of low-power operation modes, including a new gated clock, the low-power mode can reduce dynamic power consumption by closing a bus and a system clock when the lowest power consumption is required, and the peripheral equipment can still continue to operate under an optional asynchronous clock source; in the case of not waking up the kernel, the UART, SPI, I2C, ADC, DAC, TPM, LPT, DMA, etc. may support a low power consumption mode. The simplified characteristics of the Enzhipu MKL36 MCU are as follows: (1) the speed of the kernel single-cycle access to the memory can reach 1.77CoreMark/MHz (CoreMark is a benchmark test and aims to measure the performance of a Central Processing Unit (CPU) used in an embedded system); the speed of single-cycle access I/O and key peripheral equipment is improved by 50 percent compared with the standard I/O to the maximum extent; bit band operation is allowed, and software protocol simulation is performed to reduce response time of external events; the 2-stage pipeline design reduces the instruction cycle number (CPI), and improves the speed of jumping instructions and executing ISR interrupt service routines; compared with an 8-bit MCU and a 16-bit MCU, the MCU has more simplified code density, and reduces Flash space, system resources and power consumption; the more simplified instruction system optimizes the access program memory space, is completely compatible with ARM Cortex M0 and is compatible with Cortex-M3/M4 instruction set subsets. (2) Executing the trace buffer: and a lightweight tracking solution is realized, and the bug is positioned and corrected more quickly. (3) Bme (bit management engine): the bit-banded operation engine technique supports operations on peripheral registers, reducing the amount of code and the number of cycles compared to conventional read, modify, write techniques. (4) For peripheral and memory, a maximum of 4-channel DMA request service is provided, and CPU intervention is maximally lightened. (5) The CPU working frequency can support 48MHz at most. As shown in fig. 3, the main controller 1 of the present invention employs a KL36 hardware minimum system, and the hardware minimum system of the MCU is a minimum-scale peripheral circuit necessary for running an internal program, and may include a writer interface circuit. Generally, the hardware minimum system of the MCU is composed of circuits such as a power supply, a crystal oscillator, and a reset. The chip must have a power supply and a working clock for working; the reset circuit provides a means for restarting the MCU without power loss. With the development of Flash memory manufacturing technology, most chips provide a function of writing programs On a board or an On System (On System), that is, after a blank chip is soldered On a circuit board, the programs are downloaded into the chip through a writer. Thus, a hardware-minimal system should include the interface circuitry of the writer as well. Based on the idea, the KL36 hardware minimum system comprises a power supply circuit, a reset circuit, an SWD interface circuit connected with a writer, and an optional crystal oscillator circuit.
Referring to fig. 4, the power supply system 2 specifically includes a main battery interface 201, a battery voltage sampling circuit 202, a backup battery circuit 203, a first regulated power supply module 204, and a second regulated power supply module 205. The main battery interface 201 is connected with a plurality of conventional No. 5 dry batteries and is used as a main power supply of a low-power consumption NB-IoT meter terminal. The triode Q101, the resistor R102 and the resistor R103 form a battery voltage sampling circuit 202 for sampling the voltage of the main battery, and the main controller 1 is connected with the grid electrode of the triode Q101 through a sampling control pin and is controlled to execute voltage sampling when the triode Q101 is conducted; the sampling voltage signal is input to a voltage sampling pin of the main controller 1, so that the main controller 1 can judge whether the main battery is in an under-voltage state. The main controller 1 controls whether the battery voltage sampling circuit works or not by using the sampling control pin, can configure the time interval of voltage detection, does not need to detect all the time, and does not supply power to the voltage detection circuit when not detecting, thereby saving the power consumption. The first regulated power supply module 204 and the second regulated power supply module 205 both adopt TPS70933 type voltage stabilization chips. The power input end IN of the first regulated power supply module 204 is connected to the main battery interface 201 to obtain power supply of the main battery, the output end OUT is connected to the first regulated power supply output end V33, and the first regulated power supply output end V33 is connected to a power pin of the main controller 1 to provide a regulated power supply for the main controller 1. The standby battery circuit 203 comprises a standby battery E2 and a diode D102, wherein the standby battery E2 is a button battery, the two ends of the diode D102 are reverse voltage under normal conditions, and the diode D102 is disconnected, so that the standby battery is isolated from the stabilized voltage power supply module; when the main battery can not work normally, the two ends of the D102 are conducted, and E2 provides working voltage for the meter terminal; the output terminal of the backup battery circuit 203 is connected to the first regulated power supply output terminal V33. The power input end IN of the second regulated power supply module 205 is connected to the first regulated power supply output end V33 to obtain power supply, the output end OUT is connected to the second regulated power supply output end V33-2, and the second regulated power supply output end V33-2 is connected to the power pin of the NB-IoT communication module 7 to provide a regulated power supply for the NB-IoT communication module 7; v33-2 is also connected to the valve control module 4 and the gas theft detection submodule of the metering function module 3. Moreover, an enable terminal EN of the second regulated power supply module 205 is connected to a power supply control pin of the main controller 1; when the input level of the enable end EN of the power supply control pin is 0, the output voltage of V33-2 is also 0; when the input level of an enable end EN of the power supply control pin is 1, V33-2 normally outputs power supply voltage; thus, the main controller 1 can control the second regulated power supply module 205 to turn on or off the power supply through its power supply control pin. Specifically, when uplink data transmission is needed, the main controller 1 controls the second voltage-stabilized power module 205 to conduct power supply for the NB-IoT communication module 7 through the power supply control pin, and performs communication with the NB-IoT base station after the NB-IoT communication module 7 is started. The NB-IoT communication module 7 establishes a communication connection with the NB-IoT base station and then performs data upload to the NB-IoT base station; after the data uploading stage is completed, the NB-IoT communication module 7 continues to wait for the downlink data transmission from the NB-IoT base station, and obtains instructions and data for the meter from the NB-IoT management server. After the uplink and downlink communication process is finished, the NB-IoT communication module 7 feeds back the end of the data transmission to the main controller 1. Therefore, when data transmission is not executed, the main controller 1 controls the second voltage-stabilized power supply module 205 to disconnect power supply, so that the NB-IoT communication module 7 is in a power-off state, power consumption is saved to the greatest extent, and the service life of the NB-IoT communication module can be supported by 4 batteries and five batteries for more than 2 years. The main controller 1 can measure the amount of uplink data to be sent, which needs to be uploaded to the NB-IoT information post office, including data to be sent generated under the conditions of battery state transition, measurement data transition, button state transition, and the like, and when the amount of uplink data to be sent exceeds a certain data amount threshold, control the second voltage-stabilized power supply module 205 to supply power to the NB-IoT communication module 7, thereby starting one-time uplink and downlink communication. Similarly, when the valve switch and the gas stealing detection function do not need to be executed, the main controller 1 controls the second voltage-stabilized power supply module 205 to be disconnected to supply power to the valve control module 4 and the gas stealing detection submodule through the power supply control pin, so as to save energy consumption.
Referring to fig. 5, the metering function module 3 includes a reluctance switch metering submodule 301 and an air theft detection submodule 302. Wherein, magnetic resistance switch submodule 301 has adopted the TMR1302 measurement chip of magnetic resistance switch measurement mode, has with low costs, the sampling is stable, the measurement is accurate, the advantage that the fault rate is low, compares sampling modes such as tongue tube, photoelectric type, camera type of transmission and has obvious advantage, and magnetic resistance switch submodule 301 is supplied power by V33. The gas stealing detection submodule 302 is powered by V33-2, and is powered on to work when detection is needed and powered off when detection is not needed.
Referring to fig. 6, the valve control module 4 is powered by V33-2, when the valve needs to be opened or closed, the main controller 1 controls V33-2 to supply power to the valve control module 4 through the power supply control pin, and when the valve does not need to be opened or closed, the main controller controls V33-2 to power off the whole valve control module 4. The valve control module 4 specifically includes a dc motor 401 and a motor forward/reverse rotation driving circuit 402. The dc motor 401 drives the opening and closing action of the gas valve. The motor forward/reverse rotation driving circuit 402 includes: the triodes Q401, Q402, Q403, Q404, Q405 and Q406, and the matched voltage-stabilizing capacitor C402 and bias resistors R401-R406. Drive signal terminals VDJZ, VDJF of the motor forward and reverse rotation drive circuit 402 are connected with a motor drive pin of the main controller 1, when VDJZ is high level and VDJF is low level, Q401, Q402 and Q403 are conducted, and Q404, Q405 and Q406 are cut off; when VDJZ is low level and VDJF is high level, Q401-Q403 is turned off, Q404-Q406 is turned on, and the motor is controlled to rotate forward or backward by the change of current direction. The motor sampling interfaces AD1 and AD2 provide AD sampling signals for motor state sampling pins of the main controller 1, and the main controller 1 judges whether the valve is opened or closed in place or not or whether the valve slips or not according to the AD sampling signals. The VALVE in-place signal interface VALVE PIN is connected with a VALVE state input PIN of the main controller 1, the input PIN is an input PIN with a GPIO interrupt function, and when the VALVE is in place, the motor outputs a switch signal to the PIN.
The display screen 5 is an LCD display screen, and the LCD is driven by direct software driven by a sectional LCD inside the main controller 1, so that the cost is saved, and the failure rate is reduced.
The NB-IoT communication module 6 is used for realizing uplink and downlink data transmission with the NB-IoT base station based on NB-IoT communication, so that the metering value, the battery state, the valve state and the temperature in the table of the low-power consumption NB-IoT meter terminal are uploaded to the NB-IoT base station, and issued instructions and data are obtained through the NB-IoT base station. Referring to fig. 7, the NB-IoT communication module 6 is powered by the V33-2 as described above using the BC95 minimal system to connect to the main controller 1, thereby implementing data transceiving with the main controller.
The touch key 7 utilizes the function of the main controller 1 including the touch TSI, designs the touch key, improves the performance and avoids the mechanical key failure. The temperature detection module 8 uploads the temperature in the meter by using a built-in temperature sensor. The method provides a foundation for the performance analysis of the table and also provides basic guarantee for the operation.
The NB-IoT management server is used as a remote platform for realizing background management and online service of the system, manages the total water, electricity and gas consumption and balance of a user based on metering data uploaded by a massive NB-IoT meter terminal at the front end, and supports service functions of prepayment, post-payment, online payment, mobile phone payment and the like. And the NB-IoT management server provides a big data analysis function, and can realize classification and identification of user patterns according to the metering data accumulated by the user; on the basis, prompts related to the user mode to which the user belongs are pushed to the user through a human-computer interaction system.
Specifically, the NB-IoT management server automatically classifies the metering data into a number of pattern clusters based on the metering data generated and uploaded by all users in the area for which the server is responsible for within a fixed time interval. Specifically, the past 10 days are regarded as oneIn each time interval, extracting the metering data recorded in the time interval by all users in the area in charge of the NB-IoT management server, and assuming that the metering data of n users is counted as Ei-n,Ei-n+1...,Ei(ii) a Presetting to classify the users into k mode clusters, randomly selecting k values from the metering data of n users as initial cluster centers, and calculating as Ec1,Ec2,......,Eck(ii) a Calculation of Ei-n,Ei-n+1...,EiEach of the measured data and Ec1,Ec2,......,EckThe distance value V of each cluster centeri-Ck＝|Ei-EckI, and then Ei-n,Ei-n+1...,EiEach metering data in Ec1,Ec2,......,EckThe cluster to which the cluster center closest to the cluster center belongs; then, recalculating the cluster center of each cluster, wherein the recalculated cluster center is the metering data closest to the average value of the metering data values of each cluster; then calculate Ei-n,Ei-n+1...,EiAnd E is calculated according to the distance value of each measured data and the recalculated cluster centeri-n,Ei-n+1...,EiEach metering data in the cluster is redistributed to the cluster to which the cluster center closest to the metering data belongs; then updating the clustering center again; and iterating the processes until the cluster center is not changed after updating. In this way, after all n users in the area in which the NB-IoT management server is responsible are divided into k pattern clusters according to the distribution of the measurement data, the average value of the measurement data of each pattern cluster is counted, and it is determined, by comparison with the classification standard, whether the cluster in which each user is located belongs to a high usage cluster, a medium usage cluster or a low usage cluster. And pushing a prompt related to the mode cluster type of each user to the user by the man-machine interaction system according to the cluster type of each user. For example, for a user who belongs to a high-usage cluster in a plurality of continuous time intervals, a prompt for paying attention to control water, electricity and gas usage is pushed. For users who originally belong to medium-dosage clustering and low-dosage clustering but are mutated into high-dosage clustering in recent time intervalAnd pushing a prompt for checking whether the water, electricity and gas facilities have the phenomena of leakage, overflow and drip.
Therefore, the low-power consumption NB-IoT meter terminal uploads time and the measured values of gas and water based on the NB-IoT communication technology, and provides basic data for step price calculation; the temperature, the battery state, the valve state and the like in the gas meter are uploaded, and the automatic state monitoring of the gas meter is realized; the remote control valve can receive a valve opening and closing instruction issued remotely to control the state of the valve. The low-power consumption NB-IoT meter terminal has a specially designed low-power consumption structure, the main controller controls the power supply of the NB-IoT communication module, the valve driving circuit, the battery voltage detection and other components, and the power supply is cut off when the components are not applied, so that the power consumption is thoroughly saved. Based on NB-IoT communication technology, the invention establishes a background system with rich functions through an NB-IoT information post office and a human-computer interaction system (HCI), supports big data analysis, can realize functions of prepayment, post prepayment, online payment, mobile phone payment and the like, and has the alarm functions of prompting a user to pay by short messages or WeChat, replacing batteries and the like.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A low power consumption NB-IoT meter terminal, comprising: the device comprises a main controller, a power supply system, a metering function module, a valve control module and an NB-IoT communication module; wherein,
the main controller is connected with a power supply system through a power supply control pin, and controls the on-off state of the power supply system to the NB-IoT communication module and/or the valve control module through the power supply control pin;
the NB-IoT communication module realizes the uplink and downlink communication of the meter terminal based on an NB-IoT communication mode.
2. The low power consumption NB-IoT meter terminal according to claim 1, wherein the power system comprises a first power output and a second power output, wherein the first power output is configured to power the main controller; the second power supply output end is used for supplying power to the NB-IoT communication module and/or the valve control module; and controlling the on and off of the power supply of the second power supply output end according to the state of the power supply control pin.
3. The NB-IoT meter terminal with low power consumption of claim 1, wherein the power system comprises a main battery interface and a backup battery circuit, and both the main battery interface and the backup battery circuit output power through the first power output terminal.
4. The NB-IoT meter terminal with low power consumption of claim 1, wherein the power supply system comprises a battery voltage sampling circuit for sampling the voltage of a main battery, and the main controller controls the on and off of power supply to the battery voltage sampling circuit through a sampling control pin; the main controller obtains the sampling voltage of the battery voltage sampling circuit through the voltage sampling pin so as to judge the voltage condition of the main battery.
5. The low power consumption NB-IoT meter terminal according to claim 1, wherein the meter terminal uploads the metering value obtained by the metering function module, the battery status sampled by the power module, the valve status provided by the valve control module through the NB-IoT communication module, and obtains the downstream valve control command.
6. The low power consumption NB-IoT meter terminal in accordance with claim 1, further comprising at least one of the following components: display screen, touch button, temperature detection module.
7. The low power consumption NB-IoT meter terminal of claim 6, wherein the temperature detection module uploads in-table temperature data via an NB-IoT communication module.
8. The low power consumption NB-IoT meter terminal according to claim 1, wherein the valve control module comprises: a direct current motor and a motor forward and reverse rotation driving circuit; the motor forward and reverse rotation driving circuit controls the current direction input to the direct current motor according to a motor driving pin of the main controller, so that the direct current motor is controlled to rotate forward or reversely; the valve control module further comprises: the motor sampling interface is used for providing sampling signals for the motor state of the main controller by adopting pins; and the valve in-place signal interface is used for providing a switch signal for indicating that the valve is in place for a valve state input pin of the main controller.
9. The low power consumption NB-IoT meter terminal according to claim 1, wherein the metering function module comprises a reluctance switch metering submodule and an air theft detection submodule.
10. A low power consumption NB-IoT metering system, comprising:
the low-power consumption NB-IoT meter terminal is used for uploading the metering value, the battery state and the valve state of the meter terminal based on the NB-IoT communication function and obtaining a downlink valve control instruction;
an NB-IoT information post office comprising an NB-IoT base station and an NB-IoT management server; the NB-IoT base station provides wireless signal coverage for the low-power consumption NB-IoT meter terminal to realize network access; the NB-IoT management server manages the total user consumption and balance based on the metering data uploaded by the NB-IoT meter terminal, automatically monitors the state data of the NB-IoT meter terminal and realizes a big data analysis function;
and the man-machine interaction system sends a prompt message to the user according to the data of the NB-IoT management server to prompt that the stored value is insufficient or the battery power is insufficient, and realizes the online service function.
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