Separable electronic water meter and wireless communication method using same

Abstract

The present invention has the following features. The present invention relates to a separable electronic water meter comprising: a flow rate sensor configured inside a water meter box; a display unit for displaying flow rate data transmitted from the flow rate sensor, wherein a signal from the flow rate sensor is controlled by an MPU configured in an external space of the water meter box; and a wireless communication unit for periodically transmitting the flow rate data displayed on the display unit to a server through wireless communication, wherein the MPU is configured to control the flow rate sensor, the display unit, and the wireless communication unit.

Description

Separate electronic water meter and wireless communication method using the same

[0001] The present invention relates to an electronic water meter.

[0002] Digitalization and wireless communication capabilities are essential for building water meter AMI (Advanced Metering Infrastructure).

[0003] However, the installation environment of water meters, commonly referred to as manholes or pump boxes, is an obstacle to the AMI business.

[0004] Manholes for installing water meters in single-family homes are vulnerable to flooding, condensation, and freezing, and pump boxes in multi-family homes are also not free from condensation and freezing.

[0005] Compared to mechanical water meters of the past, electronic water meters are vulnerable to such environments and can also cause wireless communication failures.

[0006] Therefore, it is necessary to improve the water meter by separating the metering unit (including the sensor) that measures tap water and the indicating unit consisting of the electronic device so that the indicating unit can be installed externally, and by developing a completely waterproof, detachable water meter for the metering unit sensor.

[0007] The existing electronic water meter was developed to use an electronic device instead of the timing gear of a mechanical water meter to transmit the flow rate value through an external communication device to enable remote metering.

[0008] The description of the conventional electronic water meter of Figure 6 is as follows.

[0009] In the flow measurement method, an impeller (600) is installed inside the brass container of the metering unit, and the measurement is made by rotating at a constant speed according to the flow rate when water passes through it.

[0010] A permanent magnet is attached to the top of the impeller so that it can rotate together with the impeller (600), and the change in polarity during rotation is measured by a sensor.

[0011] The two sine waves shown at the bottom of the sensor in Figure 6 are sine waves that represent the change in the magnetic field when the impeller rotates, and the presence of another sine wave with a phase difference of 90 degrees means that the sensor can detect the rotation direction of the impeller.

[0012] If one is called a sine wave, the other can also be called a cosine wave.

[0013] The flow rate that passes through the impeller per rotation varies depending on the flow rate, and the flow rate is calculated by taking this into account.

[0014] The role of the directive in background technology is as follows:

[0015] The display unit (310) is responsible for the function of controlling the display unit that displays the flow rate and various information and the flow rate sensor (410) and the serial communication unit (215).

[0016] The MPU (110) of the water meter calculates the flow rate by checking the rotation speed and rotation number input from the flow sensor (410).

[0017] The flow rate measured over a certain period of time is added to the existing accumulated flow rate and the accumulated amount is displayed on the display unit (310).

[0018] The MPU (110) transmits data in response to an external data request through a serial communication cable connected to an external device.

[0019] The communications for power and automatic meter reading are as follows:

[0020] Electronic water meters generally use lithium batteries (510) because it is difficult to use an external power source due to the installation environment.

[0021] The battery is built-in with a low-power design that allows for 8 years of use, but the lifespan of the lithium battery is shortened when exposed to the outside environment.

[0022] The communication device for automatic meter reading is configured separately and connected to the electronic water meter via serial communication.

[0023] The first problem that the invention seeks to solve is to solve the problem of moisture and condensation by installing all electronic devices other than the flow sensor separately from the measuring sensor unit and externally.

[0024] The second problem that the invention seeks to solve is to solve the problem of transmitting and receiving accurate signals by molding the flow sensor in the form of a single chip using epoxy resin or the like to provide a high level of waterproofing and / or dustproofing.

[0025] The third problem that the invention seeks to solve is that the external installation of the display unit is convenient for visual inspection through the display device, and that the use of a large-capacity battery allows for the solution of the problem of securing a stable power supply.

[0026] The fourth problem that the invention seeks to solve is to solve the problem of securing desirable wireless communication by combining the wireless communication unit with the display unit and installing it externally.

[0027] The fifth problem that the invention seeks to solve is to resolve the wiring, alignment, and various other problems that arise from the connection between the electronic water meter and the wireless communication unit.

[0028] The sixth task that the invention seeks to solve is to lower the manufacturing cost and resolve the problem of defect rate by developing a water meter and wireless communication integrated board.

[0029] The seventh problem that the invention seeks to solve is to enable the wireless communication modem chip and the water meter indicator to be controlled by a single MPU.

[0030] The eighth problem that the invention seeks to solve is that when installing a water meter, the application can be used to install the water meter on-site and input information. Then, a remote manager can check the installation status on the server and check the communication to see if the meter reading data is being input properly, thereby solving the problem of A / S occurring due to this.

[0031] In order to solve the above-mentioned problem, it has the following structure.

[0032] Sensor unit configured inside the water meter box;

[0033] The signal of the above sensor unit is controlled by the MPU configured in the external space of the water meter box,

[0034] A display unit that displays the flow rate data transmitted from the above sensor unit;

[0035] A wireless communication unit that periodically transmits the flow rate data displayed on the display unit to the server via wireless communication;

[0036] The above MPU constitutes a separate electronic water meter including a configuration to control the sensor unit, the display unit, and the wireless communication unit.

[0037] Here, it is preferable to configure the MPU to control the flow calculation and the wireless communication unit by setting threads, respectively.

[0038] The second embodiment is as follows.

[0039] Flow rate data calculation step that calculates the flow rate according to the use of tap water;

[0040] A flow rate data transmission step for transmitting the flow rate data calculated in the above flow rate data calculation step;

[0041] In the case where the wireless communication from the wireless communication unit to the server during the above-mentioned flow data transmission step and the flow data calculation step when using water within the flow meter overlap, the electronic water meter has a wireless communication method for calculating the flow rate, including setting the flow rate data calculation step and the flow rate data transmission step as threads, so that they do not mutually affect each other.

[0042] The third embodiment is as follows.

[0043] A flow sensor that generates pulses according to the rotation of the impeller when tap water flows;

[0044] When the above flow sensor detects the rotation of the impeller, it counts the number of rotations by triggering a pulse according to the rotation.

[0045] The flow rate calculated by calculating the flow rate by the pulse interval and the number of pulses is added to the accumulated flow rate and displayed on the display device, and the accumulated flow rate and pulse generation time are updated and stored.

[0046] The flow data sent to the server is transmitted by the wireless communication unit according to the cycle received from the server.

[0047] The load generated when transmitting the flow data of the above wireless communication unit,

[0048] Since tap water is used frequently, the load generated by measuring the flow rate and calculating the flow rate are configured to operate independently so that they do not mutually affect each other.

[0049] This is a wireless communication device configured for calculating flow rate of an electronic water meter, including configuring a wireless communication modem to transmit a wireless communication packet through a designated channel by applying power to the modem immediately before transmission in order to reduce battery consumption when transmitting flow rate data.

[0050] Since the wireless communication packets transmitted here are received by both repeaters and concentrators using the same channel, it is preferable to have a configuration that includes configuring the server to remove duplicate wireless communication packets through a packet filter and to take the wireless communication packets received with the highest communication sensitivity.

[0051] The first effect of the invention is that all electronic devices other than the flow sensor are installed externally, separate from the sensor unit, which is the metering unit, thereby overcoming the problem of moisture and condensation.

[0052] The second effect of the invention is that the flow sensor is molded in a single-chip form using epoxy resin, etc., to provide a high level of waterproofing and / or dustproofing, thereby transmitting and receiving accurate signals.

[0053] The third effect of the invention is that the external installation of the display unit makes it convenient for visual inspection through the display device, and it has the effect of securing a stable power supply by allowing the use of a large-capacity battery.

[0054] The fourth effect of the invention is that the wireless communication unit is installed externally by combining it with the display unit, which has the advantageous effect of securing desirable wireless communication.

[0055] The fifth effect of the invention is that it has the effect of solving various problems arising from wiring, alignment, and other problems arising from the connection of an electronic water meter and a wireless communication unit.

[0056] The sixth effect of the invention is that the manufacturing cost is lowered and the defect rate is reduced due to the development of a water meter and wireless communication integrated board.

[0057] The seventh effect of the invention is that it enables the development of an integrated circuit that can control a wireless communication modem chip and a water meter indicator with a single MPU.

[0058] The eighth effect of the invention is that when installing a water meter, the application can be used to install the water meter on site and input information, so a remote manager can check the installation status on the server and check communication to see if the meter reading data is being input properly, so there is no need to worry about A / S being required.

[0059] Drawing 1a is a diagram showing an MPU that controls a wireless communication terminal, a flow sensor, and a display unit.

[0060] Drawing 1b is a drawing showing a separate water meter of the present invention.

[0061] Figure 2a is a diagram showing the construction of a wireless communication network using IoT technology.

[0062] Figure 2b shows a practical example of building a wireless communication network in a multi-family home.

[0063] Figure 2c solves the problems of flooding, condensation, freezing, and wireless communication failure in manholes of single-family houses by installing a separate water meter display unit externally, and collects data by eliminating wireless communication distance and shadow areas through MESH LINK.

[0064] Figures 3a to 3c are diagrams showing an installation app and flow chart for an electronic water meter installation method.

[0065] Figures 3d and 3e are additional drawings explaining Figures 3a and 3b.

[0066] Figure 4 illustrates a flow chart for calculating flow rate and transmitting flow rate data to a server via wireless communication when using a water meter.

[0067] Figures 5a to 5c are diagrams related to the display and communication.

[0068] This is a diagram showing the electronic water meter, which is the background technology of Figure 6.

[0069] The best mode for carrying out the invention is as follows, with respect to the operating method of the above-mentioned separate electronic water meter.

[0070] Figure 4 is a flowchart explaining the wireless communication process when using a water meter, as follows.

[0071] In order to operate an electronic water meter and a wireless communication terminal simultaneously, the flow calculation and wireless communication functions must be able to be performed simultaneously and there must be no interference between them.

[0072] The core of the electronic water meter is to calculate the pulse detected from the flow sensor (400) as a flow rate, calculate the flow rate, add it to the previously stored accumulated flow rate, and display it on the LCD.

[0073] The core of wireless communication that transmits flow rate to the server is to transmit flow rate data to the server (1000) 3 to 4 times per day (changeable settings), and the transmission time is determined by a timer.

[0074] Since flow measurement must be performed immediately when a pulse is generated from the flow sensor (400), an interrupt vector is set as a trigger for the pulse from the flow sensor, and a flow calculation program can be performed by the interrupt (S400).

[0075] When measuring pulses from a flow sensor for flow calculation, two pulses are generated per rotation of the impeller (600). The lengths of the pulses are different. A long pulse coming first indicates forward water flow, and a short pulse coming first indicates reverse water flow. This is detected and recorded in the status value.

[0076] Since wireless communication is operated by transmission time by a timer trigger (a type of alarm) (S420), the timer trigger is set to an interrupt vector, and when an interrupt occurs, the accumulated flow and status value (backflow, unused, etc.) are read and written to the communication buffer, and then a command is given to the communication modem to transmit (S421).

[0077] At this time, to check the unused status of the water meter, check the time when the last accumulated flow was recorded (S421).

[0078] If unused is checked, especially if it is a vulnerable group such as a single elderly person, contact the relevant organization and take appropriate action.

[0079] The metering value is transmitted to the server, and when a packet notifying the completion of data reception is received, the setting values ​​to be updated (in particular, the function of correcting the water meter's timer with time information) are downloaded, the wireless modem is powered off, the downloaded setting values ​​are updated, and then communication is terminated (S422).

[0080] That is, data detecting flow data or unused status is transmitted to the server (S421), a packet from the server notifying completion of data reception is received (S422), time information and communication parameters for updating the water meter are downloaded, the time of the timer is corrected using the downloaded time information and communication parameters, the communication parameters are updated, and the communication modem is powered off and communication is terminated (S423).

[0081] By setting threads in the flow calculation stage and the wireless communication stage respectively, the flow calculation stage and the wireless communication stage are protected from being affected by each other even if they occur simultaneously.

[0082] Threads work together in one process, but they do not invade each other's areas so that they can maintain independence, but they can share memory. Therefore, even while continuously updating flow data in flow calculation, it is possible to read this during wireless communication and send it to the server (1000).

[0083] When the flow sensor (400) operates (S430), the flow rate of the sensor count by interrupt is immediately converted (S431), and the accumulated flow rate is calculated and stored, and displayed on the display unit (300) (LCD) (S432).

[0084] When interrupted by a timer trigger, the accumulated flow is read and transmitted to the server (1000).

[0085] The steps S430 to S432 describe the steps in which the flow sensor operates to convert the flow rate, calculate the accumulated flow rate, and display it on the display unit.

[0086] Transmitting the flow rate data when the accumulated flow rate transmission time is reached is described in steps S420 to S422.

[0087] The advantage of a separate water meter is that the electronic device, which is often the cause of failure in poor water meter installation environments, can be separated from the water meter and installed outside, making it safe from flooding, freezing, condensation, etc.

[0088] In this process, the electronic water meter and wireless communication terminal were integrated, and the transmission of flow data between the electronic water meter and the communication terminal became possible through memory sharing, so the serial communication (TTL) function, which is the interface for transmitting flow data, became unnecessary, and thus, various problems that occurred during the installation process related to serial communication were naturally resolved, which brought about the advantage of this.

[0089] Additionally, the wireless communication environment is clearly improved by installing the wireless terminal outside the water tank.

[0090] A separate water meter can control the functions of the water meter and the wireless communication terminal simultaneously with one MPU (100).

[0091] The water meter's flow rate calculation process is such that when water flow occurs, a pulse (twice per rotation) is generated from the flow rate sensor, and this pulse becomes a trigger for the MPU (100) to start calculation.

[0092] In other words, an interrupt occurs due to pulse generation, and the code that can process this interrupt when it occurs must be registered in a table called an interrupt vector.

[0093] An interrupt vector is a table where a processing program is registered to handle an event that occurs within the circuit.

[0094] When an interrupt occurs, the corresponding program code registered in the interrupt vector is found and the specified process is performed.

[0095] When water flows, two pulses occur per rotation of the impeller (600), the first pulse is slightly longer in time and the second is slightly shorter, and the rotation direction of the impeller (600) can be determined depending on which pulse occurs first.

[0096] In order to transmit the accumulated flow rate, which is flow rate data, to the server (1000), the transmission time is also set to the timer and input into the interrupt vector.

[0097] When the specified time set in the timer is reached, an interrupt occurs and the communication program registered in the interrupt vector is executed accordingly.

[0098] The fact that the flowchart is split in two means that each process must be able to be performed simultaneously (Figure 4).

[0099] The wireless communication program must be able to operate simultaneously with the flow calculation calculation program.

[0100] And, in order to save battery, a method is used to cut off the power of the communication modem when not communicating and to supply power only when communicating. At this time, it is not a one-way communication, but rather, flow data and status information are sent to the server (1000), and when the response of the server (1000) is confirmed, commands of the server (1000) can be downloaded.

[0101] When the communication timer is operating, if there is no change in the accumulated flow rate of tap water, it is considered unused, and generally, if there is no change for 5 to 7 days, it is considered unused. (S421)

[0102] One is to calculate the flow rate from the water meter, display it on the LCD, and store the flow rate information in the memory (S430~S432). Another is to read the stored flow rate information from the memory and transmit it via wireless communication (S420~S422).

[0103] Steps S420 to S423 of FIG. 4 correspond to the flow data transmission step, and steps S430 to S432 correspond to the flow data calculation step.

[0104] It has a flow rate data calculation step that calculates the flow rate according to the use of tap water.

[0105] It has a flow rate data transmission step for transmitting the flow rate data calculated in the above flow rate data calculation step.

[0106] The present invention relates to a wireless communication method for calculating flow rate of an electronic water meter, including setting the flow rate data calculation step and the flow rate data transmission step as threads, so that when the wireless communication from the wireless communication unit (200) to the server (1000) in the flow rate data transmission step overlaps with the flow rate data calculation step when water is used in the flow meter, they do not mutually affect each other.

[0107] The development of smart water meters is considered one of the most important developments in the water industry.

[0108] Advanced Metering Infrastructure (AMI), which focuses on Automatic Meter Reading (AMR) for water billing, can enable more efficient management of water resources in addition to IoT functions that collect and transmit useful information.

[0109] Therefore, we must focus not only on data collection functions but also on data integration and processing using big data technology.

[0110] Implementing AMI for water meters can maximize the value-added services for users regarding water usage.

[0111] For example, by developing algorithms to detect water leaks and predict demand, it is possible to balance hourly water consumption, reduce the amount of tap water consumed unnecessarily in drinking water supply systems, and detect water misuse and leaks early.

[0112] It is also possible to expand into social services such as notification of changes in water consumption patterns of vulnerable groups.

[0113] Automated meter reading can reduce operator effort required to physically read meters, improve overall processes, and increase transparency in the relationship between water utility and consumers by issuing bills based on actual water usage.

[0114] The present invention is a separate water meter for automatic meter reading that has many problems in automatic meter reading.

[0115] In the current background technology, wireless modems are developed in a modular form, with the modem chip and MPU chip contained within the modem.

[0116] If you simply control communication to send and receive data, it is possible to do so through MPU control within the modem, but to process complex functions such as a water meter, a separate MPU is required.

[0117] The present invention removes the MPU within the communication modem and is designed to directly control the communication modem chip from the water meter MPU.

[0118] In the background technology, the internal space of the meter is very narrow, so only an AA-sized battery can be used, but if it is separated externally, it has the advantage of being able to use a battery with five times the capacity of the existing one or more.

[0119] Five times is just one example, and the battery capacity can be determined according to the user's needs, and it may also be used as a commercial power source.

[0120] The following concerns a separate electronic water meter.

[0121] As shown in Figures 1a and 1b, the flow sensor is configured in the water meter box, and all components are configured externally.

[0122] It shows a flow sensor (400) which is a sensor unit configured inside a water meter box.

[0123] FIG. 1b shows a flow sensor configured by molding it so that it is not affected by humidity.

[0124] The following is explained with reference to Drawings 1a and 1b.

[0125] The signal of the above flow sensor (400) is controlled by an MPU (100; Micro Processor Unit) configured in the external space of the water meter box.

[0126] A display unit (300) is configured to display flow rate data transmitted externally from the above sensor unit, the flow rate sensor (400).

[0127] A wireless communication unit (200) is configured to periodically transmit flow rate data displayed on the above display unit (300) to the server (1000) configured in FIG. 2a via wireless communication.

[0128] In the circuit diagram of Fig. 1a, the MPU (100) relates to a separate electronic water meter configured to control the flow sensor (400), the display unit (300), and the wireless communication unit (200).

[0129] Here, the MPU is configured to control the flow calculation and the wireless communication unit (200) by setting threads, respectively, so that they are not affected by each other's load.

[0130] The following is about wireless communication devices for flow calculation of electronic water meters.

[0131] A flow sensor (400) is configured to generate pulses according to the rotation of the impeller when tap water flows.

[0132] When the above flow sensor (400) detects the rotation of the impeller, it counts the number of rotations by triggering a pulse according to the rotation.

[0133] The flow rate calculated by calculating the flow rate by the pulse interval and the number of pulses is displayed on the display unit (300) in addition to the accumulated flow rate, and the accumulated flow rate and pulse generation time are updated and stored.

[0134] The flow rate data sent to the server (1000) is transmitted by the wireless communication unit (200) according to the cycle set by the server (1000).

[0135] The load generated when transmitting the flow data of the above wireless communication unit (200),

[0136] Since tap water is used frequently, the flow rate generated is measured and the load generated by the flow rate calculation is configured to operate independently so that they do not mutually affect each other.

[0137] By configuring them in this way, they operate independently of each other, so that no data is missed and is calculated and transmitted.

[0138] In background technology, when a load is generated due to one operation, there are frequent cases where the operation of another load interferes with data transmission or data accumulation.

[0139] As a result, most local governments in South Korea that have adopted electronic water meters as a background technology are reverting to the method of removing the electronic water meters and having meter readers check them.

[0140] The present invention was developed under this background.

[0141] The invention relates to a wireless communication device for calculating flow rate of an electronic water meter, which includes a configuration in which power is supplied to a wireless communication modem immediately before transmission to transmit a wireless communication packet through a designated channel in order to reduce battery consumption when transmitting flow rate data.

[0142] The wireless communication packet transmitted here is received by both a repeater and a concentrator using the same channel, so that the server removes duplicate wireless communication packets through a packet filter and takes the wireless communication packet received with the highest communication sensitivity, which includes a wireless communication device for calculating flow rate of an electronic water meter.

[0143] More specifically, this is explained with reference to Figures 1a and 1b as follows.

[0144] Only the flow sensor (400) is installed in a manhole or a pump box, and all other equipment is installed externally.

[0145] A detachable water meter is an automatic metering water meter that allows the electronic device, which is vulnerable to flooding, condensation, freezing, etc., to be separated and installed outside to overcome problems in the water meter installation environment, such as manholes and pump boxes.

[0146] The impeller method, which has been used since the mechanical water meter, has proven its durability over a long period of time.

[0147] In the present invention, the water meter also uses an impeller (600).

[0148] High humidity and condensation, which are fatal weaknesses of electronic devices, adversely affect the lifespan of lithium batteries (500).

[0149] Lithium batteries are usually used.

[0150] Even if waterproofing and insulation are implemented in various ways, problems arise more in places where temperature and humidity change with the seasons and ventilation is poor.

[0151] In the present invention, all electronic devices other than the flow sensor (400) are separated from the metering unit and installed externally, thereby having the effect of overcoming the problems of moisture and condensation.

[0152] The one-chip flow sensor (400) is treated with a high level of waterproofing and / or dustproofing through molding using epoxy resin, etc., and has the effect of transmitting and receiving accurate signals.

[0153] In the present invention, the external installation of the display unit (300) is convenient for visual inspection through the display unit and allows for the use of a large-capacity battery, thereby providing the effect of securing a stable power supply.

[0154] In the present invention, the wireless communication unit (200) is installed externally in combination with the display unit (300), which has a very advantageous effect in securing desirable wireless communication.

[0155] When installed externally, it is effective in resolving wiring, alignment issues, and various resulting problems that occurred when connecting electronic water meters and wireless communication devices located inside manholes or pump boxes.

[0156] The development of an integrated board for an electronic water meter and a wireless communication terminal has the effect of lowering manufacturing costs and reducing the defect rate.

[0157] The present invention is very efficient because it configures an integrated circuit so that a wireless communication modem chip and a water meter display unit (300) can be controlled by a single MPU (100).

[0158] This is explained as follows using Figure 2a.

[0159] It is possible to build a wireless communication network using IoT technology.

[0160] Expanding user value-added services through AMI deployment requires an IoT communications network covering a relatively wide area. Therefore, using repeaters (800) and concentrators (900), it is possible to build a stable wireless communications network with a radius of 1 to 2 km.

[0161] It is possible to construct a wireless communication network that automatically reads not only water meters but also hot water meters, gas meters, heat meters, and electric meters using a repeater (800) and a concentrator (900).

[0162] This is explained as follows using Figure 2b.

[0163] This is a practical example of building a wireless communication network in a multi-family home.

[0164] The construction of a wireless communication network in a multi-family dwelling such as an apartment complex is to prevent data loss due to simultaneous communication in order to accommodate a large number of terminals, and to eliminate dead zones through communication schedule management and MESH LINK using a 2-channel repeater (800).

[0165] This is explained as follows using Figure 2c.

[0166] The problem of flooding, condensation, freezing and wireless communication failure in manholes of single-family houses is solved by installing a separate water meter display unit (300) externally, and data is collected by eliminating wireless communication distance and shadow areas through MESH LINK.

[0167] The explanation is as follows with reference to Figures 3a and 3b.

[0168] The method for installing an electronic water meter is as follows.

[0169] The electronic water meter must download settings such as communication speed, communication channel, and data transmission cycle from the server (1000) and perform initialization.

[0170] When the switch is turned on by the timer or the installer operates the reed switch, the server (1000) requests the setting value.

[0171] If you set it to communicate 4 times a day, the timer will wait 8 hours, and the reed switch will communicate immediately.

[0172] When the water meter is installed in each household, and the installer enters the installation location and detailed address (1203, Building 103, Uijeongbu Korea Apartment in Drawing 3b) and serial number (10-20231011) into the installation app, the installation time is automatically entered, and when the complete button is clicked, the first communication with the server (1000) is performed, and the water meter settings can be downloaded from the server (1000).

[0173] The total meter value 003456 (shown in the total meter value of Fig. 3b) is entered by the installer and managed by the server (1000).

[0174] Communication is initiated whenever the installer operates the reed switch.

[0175] After installation and stabilization, the flow rate calculation value is input from the server (1000) through periodic communication by a timer.

[0176] For water meter installation, the water meter serial number, installation location, and detailed address are important.

[0177] Channels (frequencies), node numbers, and various parameters are also required to enable wireless communication.

[0178] Among these, values ​​can be divided into those that can be initialized and those that must be set differently for each device.

[0179] The method for installing an electronic water meter is as follows.

[0180] The electronic water meter must download settings such as communication speed, communication channel, and data transmission cycle from the server (1000) and initialize for meter reading.

[0181] Communication speed, communication channel, data transmission cycle, etc. are used to set the communication method for transmitting the water meter readings to the server. To download these, an installation address and serial number are required, and they can be registered on the server (1000) through a dedicated app for installation.

[0182] When the switch is turned on by the timer inside the electronic water meter, or when the installation work is completed and the installer operates the reed switch (S110), the first communication with the server (1000) is made.

[0183] At this time, the server (1000) requests the water meter setting values ​​such as communication speed, communication channel, and data transmission cycle corresponding to the installation address using the serial number as a delimiter. (S120)

[0184] When a request for setting values ​​is transmitted to the server (1000), transmission of the setting values ​​begins, and the status is checked to see if the download of the first setting values ​​starts normally (S130), and if not, the setting values ​​are requested again (S120).

[0185] If the number of times the setting value is requested again exceeds 3, the download is stopped due to a timeout, the communication status is checked again, and then the reed switch is operated (S110) to request the setting value from the server (S120) and the setting value is downloaded again (S130).

[0186] If the download of the setting value is successful, the size of the downloaded packet is checked, and if the size is different, a request for the setting value is made to the server (1000) again (S140).

[0187] In order to detect errors during the download process via communication, a process is performed to check whether the settings are normal using the error detection code included in the settings and the size of the settings. If an error is detected, an attempt is made to automatically download again. (S150)

[0188] When the download of settings from the server is completed, the system automatically reboots, and during the reboot process, the default settings for initialization are changed to the downloaded settings and set. (S160)

[0189] Among the settings, the serial number and address are used to distinguish the source of the meter reading when reading the meter.

[0190] Communication speed and communication channel are communication parameters that enable communication with repeaters and concentrators installed based on addresses.

[0191] And in the embodiment of the present invention, the transmission cycle is initially a communication cycle value with the server (1000) in units of 8 hours.

[0192] The water meter is designed to communicate in 8-hour units to save battery power, so it is switched ON by a timer every 8 hours, and when necessary, the reed switch is operated to switch ON and communicate with the server (1000).

[0193] Among the downloaded settings, there are communication-related settings. Once set, the network frequency, node number, etc. are updated, so if necessary, initialization is required to set them again.

[0194] The settings must be set normally through the water meter reboot process, and the reboot is automatically performed through a software reset.

[0195] Describes Fig. 3b and Fig. 3c.

[0196] An installation app is required to install a water meter on site.

[0197] When installing a water meter, the details to be set on-site are the detailed address and the meter value from the originally installed meter. (Since the new water meter has a flow rate of 0, the previous meter value must be known to ensure metering continuity.)

[0198] Since the installation app is always linked with the server (1000), the time information, which is the installation time, and the information about the approximate installation location (Uijeongbu Hankook Apartment) are collectively registered and provided to the server (1000) for the convenience of the installation worker (S210), and the installation worker takes a photo before installation (S220).

[0199] The installer completes the input of detailed information, such as the detailed address (103-dong, 1203-room) and the total meter reading (003456) in Figure 3b, and transmits it to the server. (S230)

[0200] The worker checks the details and corrects any errors or, if correct, takes a photo after installation (S240) and registers it on the server (S250).

[0201] If the transmission process is unstable or an anomaly in the data is detected, the server (1000) must perform a procedure to request a re-transmission, but it is important to minimize the input of the installation worker to prevent the occurrence of errors in advance.

[0202] Finally, the installer operates the water meter's reed switch to allow the water meter to complete all settings on its own. When the reed switch is operated, the water meter completes the settings and transmits the initial reading to the server (1000) to indicate whether it is operating normally.

[0203] Requesting installation inspection and meter reading. (S260)

[0204] The installation manager can immediately check the contents of the installed water meter via the web and identify necessary information, such as data status and communication status, through the check. Once all checks are complete, the installation manager can declare the installation complete and instruct the installation worker to move to the next location. (S270)

[0205] Figures 3d and 3e are explained as follows.

[0206] Figures 3d and 3e further explain Figures 3a and 3b.

[0207] The administrator inputs common data, such as the channel and communication speed of the water meter, into the server (1000) before installation based on the serial number (key). (S300)

[0208] When the water meter installer enters values ​​such as the serial number and installation address into the installation app, they are entered into the table entered by the administrator. (S310)

[0209] The content entered by the installer is updated in the corresponding cell of the table previously entered by the administrator, and the installer completes the water meter installation. (S320)

[0210] Then, when the reed switch of the water meter is operated, the water meter connects to the server (1000), downloads the necessary setting values, completes the setting, and then resets. (S330)

[0211] After resetting the water meter, once it returns to a normal reading state, it transmits the reading value to the server at regular intervals. (S340)

[0212] Once the settings are completed, it switches to usage mode, cuts off power to the wireless modem, and supplies power only when necessary to save battery.

[0213] Existing wireless communication terminals are connected to electronic water meters via serial communication (TTL method).

[0214] The wireless communication terminal requests the water meter to transmit flow data via TTL after a certain period of time (3-4 times a day), and the water meter transmits the flow data to the wireless communication terminal via TTL.

[0215] A wireless communication terminal (installed in a water meter in the background technology) transmits this flow data to a server (1000), and the server (1000) accumulates metering data (including time information) in a database. A repeater (800) and a concentrator (900) are used during this transmission process.

[0216] To send flow data via wireless communication, the source (address) of the flow data being sent must be included in the transmission data.

[0217] In the wireless communication terminal, the address (location) of the place where it will be installed is entered in advance before installation, and the setting is set so that when communicating, the flow data and address are included in the packet and transmitted to the server (1000).

[0218] That is, before installing a wireless communication terminal, the frequency used, address, node number, etc. are entered (registered) in advance into the non-volatile memory of the wireless communication terminal.

[0219] This is so that when the flow data is transmitted to the server (1000), it can be identified where the flow data came from.

[0220] The frequency and node number are required for connection to the repeater (800).

[0221] Since each wireless communication terminal is sent to the installation site after entering information such as the address in advance, the wireless communication terminal to be installed must be installed at the designated address at the installation site.

[0222] In the background technology, it is necessary for a worker to complete the installation of a water meter and a wireless communication terminal and to confirm that the flow data is normally transmitted to the server (1000). In other words, the connection status with the repeater (800) and the concentrator (900) must be confirmed, but in reality, this is not the case.

[0223] In background technology, it is not possible to detect TTL connection failures.

[0224] It is also very difficult to determine the location of the repeater (800) before the wireless terminal is installed.

[0225] In the background technology, in order for the repeater (800) to be perfectly positioned, the connection status with the installed wireless terminal must be confirmed. However, as this is realistically difficult, a procedure to adjust this after the fact is currently being performed, resulting in continuous A / S.

[0226] In order to improve this, the present inventor's separate water meter automatically downloads the frequency, address, node number, etc. from the server (1000) during installation (i.e., the setting process before installation is omitted), and during this process, the communication status and normal installation status can be immediately checked on-site.

[0227] As described in Figures 3a to 3e, the installation location is to be directly entered by the installation worker through the app.

[0228] This way, managers can easily identify which water meters are communicating well and which are not, and take action immediately on site.

[0229] By integrating the communication terminal and the water meter, the water meter serial number (a unique number that must be used) can be used as a kit value (identifier).

[0230] If you look at the configuration device for tap water AMI,

[0231] 1) A water meter that can measure the flow rate

[0232] 2) A wireless communication terminal for transmitting flow data to the server (1000) and

[0233] 3) It consists of a server (1000) that collects flow data.

[0234] The background technology is that the wireless communication terminal used for AMI is an independent device located in the pump box together with the water meter.

[0235] It is located together with the water meter and connected to a TTL line (serial communication), and a timer is set to transmit flow rate data to the server (1000) 3 to 4 times a day.

[0236] Of course, the flow data is input from the water meter to the wireless communication terminal via serial communication.

[0237] The concentrator (900) is installed and connected to the server (1000) via a wire (LAN cable), and receives flow data transmitted from a wireless communication terminal and transmits it to the server (1000) using Ethernet (LAN cable).

[0238] A device called a gateway, i.e. a concentrator (900), is used to connect different communication networks that transmit data from an IoT transmission network through an Ethernet network.

[0239] The repeater (800) is a gap filler that compensates for cases where transmission is not possible due to the transmission distance being too far or a shaded area, etc. when transmitting data from a wireless communication terminal to a concentrator (900).

[0240] In general, the concentrator (900) is a device that can accommodate 8 channels, i.e. 8 frequencies, and can simultaneously transmit and receive data transmitted through 8 frequencies.

[0241] It uses multiple channels (frequencies) to connect more wireless communication terminals, as 250 wireless communication terminals can be connected to one frequency.

[0242] The detachable water meter of the present invention means that all devices are installed externally, separated from the water meter body made of brass.

[0243] In the case of a separate water meter, the manager can check the communication status on the server (1000) while the worker is working on site.

[0244] However, in the background technology, TTL is to check the connection status after setting all locations in advance, so on-site action is impossible because the worker has already left the site.

[0245] Therefore, the poor connection status of TTL cannot be checked while the worker is on site.

[0246] In the background, the current worker cannot perform the setup process, such as entering the installation location, on site.

[0247] This is something that cannot be done with conventional technology.

[0248] The present invention significantly improves the installation method.

[0249] Once hardware and software are developed, even small changes are time-consuming, costly, and technically difficult.

[0250] Moreover, it is more difficult when a terminal, a repeater (800), a server (1000), etc. must all be used.

[0251] In conclusion, the invention was invented by improving upon the trial and error in the background technology.

[0252] The purpose of the repeater (800) is to connect the wireless communication terminal and the concentrator (900).

[0253] When a water meter and a wireless communication terminal are installed together in a water tank, they may or may not be properly connected to the repeater (800).

[0254] As described above, the repeater (800) in the background technology must be connected to all installed (lower) wireless communication terminals.

[0255] Therefore, being able to connect to all sub-devices means that it is only possible after all wireless communication terminals are installed.

[0256] The current installation method makes it difficult to take immediate action on site, which led to the invention of this invention.

[0257] The reason why the installer should be able to verify that the electronic water meter is connected to the repeater (800) immediately after installation is because he wants to take action while he is on site.

[0258] After the worker completes the work, additional visits to the site are required, which requires additional costs and time, including additional travel expenses.

[0259] The IoT communication methods mainly used in our country are LoRa and NB-IoT.

[0260] There is no significant difference between using LoRa and NB-IoT for IoT communication.

[0261] However, NB-IoT is not suitable for the open communication pursued in the present invention because it was developed as a subset of mobile networks and is built by telecommunication companies.

[0262] Some people use LTE, a mobile communication network, for IoT. While the network stability is very high, there is the burden of having to pay for it.

[0263] The reason for using the server (1000) in the present invention is to use the collected data through the Internet public network.

[0264] In the case of a multi-purpose building such as an apartment complex, it is sufficient to connect the server (1000) to the management office Internet, as there are no additional costs for user services, data utilization services, etc.

[0265] If you plan to install tens of thousands of wireless communication terminals, you will need to develop an IoT communication device.

[0266] Developing a stable communication device requires a lot of time and effort, and is not technically easy.

[0267] Even if you have the technology and ability to develop it, you will inevitably have to invest a significant amount of time and money.

[0268] 안정화에 많은 시행착오를 거쳐야 하고, 데이터를 활용하기 위한 다양한 연계 서비스도 개발해야 하는 등 본원발명을 발명하는데 많은 투자와 시간이 소요된 것이다.

[0269] In the background, electronic water meters are being installed for the purpose of remotely collecting flow data.

[0270] In other words, mechanical water meters are being replaced with electronic water meters in order to read flow data from a wireless communication terminal through the serial communication function of the electronic water meter.

[0271] However, the electronic devices of electronic water meters are inevitably very vulnerable to condensation and submersion.

[0272] The water meter's validity period is usually 8 years.

[0273] Batteries have a problem of easily deteriorating due to moisture or temperature changes, so they are difficult to last for 8 years, and many cases are unusable within 1 year.

[0274] When communicating wirelessly, manholes (underground) or pump boxes (metal boxes) make wireless communication very difficult.

[0275] Therefore, local governments are facing significant challenges in addressing this issue. The Korean government plans to complete tap water AMI by 2040.

[0276] A separate water meter integrates the electronic device (flow calculation device, LCD, and wireless communication device) into one, and installs the water meter body (brass container and impeller (600), etc.) and the electronic device separately.

[0277] In other words, the purpose is to integrate the electronic devices into one and install them outside of manholes or pump boxes to ensure safety from flooding, condensation, and freezing.

[0278] In the background technology, the structure was such that problems such as insulation material cracking to prevent freezing would inevitably continue while periodic inspections were performed.

[0279] However, the separate type of the present invention integrates the water meter and communication terminal, eliminating the need for serial communication (TTL) functionality to link the two devices. Consequently, various problems arising during the installation process related to serial communication are naturally resolved, resulting in the advantage of improved wireless communication environments. Furthermore, the external installation of the wireless terminal significantly improves the wireless communication environment.

[0280] Serial communication (TTL) uses three wires (Tx, Rx, GND) and is a very simple communication method that is generally the most widely used.

[0281] Therefore, the electronic water meter has three wires, and the wireless communication terminal also has three wires, so these must be connected during the installation process.

[0282] Typically, when installing a water meter, about 5-6% of the time it is incorrectly connected, and about 10% of the time it has poor contact.

[0283] Additionally, data loss may occur when reading flow data through TTL.

[0284] The reason why omissions occur is that when a flow rate data request comes in through TTL during the flow rate calculation and display process, there is a tendency to not respond well to it.

[0285] And there is the difficulty of having to resolve many AS issues in the early stages of installation due to the intertwining of shaded areas, poor communication, etc.

[0286] Currently, when installing an apartment, we visit the installation site an average of 3 to 5 times to check the overall condition and perform tasks such as rewiring and correcting shaded areas, but the problem is not 100% resolved.

[0287] The places where wireless communication is most vulnerable are underground and inside steel enclosures.

[0288] Since water meters fall into both of these categories, the wireless communication environment is almost the worst.

[0289] Conventional integrated automatic meter reading devices do not work well even when two to three channel repeaters (800) are installed.

[0290] Since the separate water meter integrates electronic water meter and wireless communication terminal functions into one system, it internally shares flow rate data and status data through memory.

[0291] Therefore, problems such as missing flow data, poor contact, or poor connection cannot occur.

[0292] The existing integrated automatic meter reading system has been causing problems to the extent that local governments are considering canceling automatic meter reading system projects due to issues such as missing flow data and poor contact that have not been improved.

[0293] Serial communication lines (TTL) are made up of three thin wires, and poor contact occurs when a connection appears to be good when viewed with the naked eye, but signal transmission and reception are not smooth.

[0294] If it could be confirmed immediately through communication during installation work, action could be taken on site, but in the background technology, there was no device or method for workers to confirm communication on site.

[0295] Therefore, in the present invention, an installation app is developed so that workers can check it at the work site.

[0296] Because there is no cost if you fix it on site.

[0297] And sometimes the serial communication of the water meter itself is defective.

[0298] You can replace the water meter right away at this time, but if you replace it later, additional costs will be incurred.

[0299] The present invention was born under this background.

[0300] The meaning of a separate water meter is to completely seal the water meter body and the flow sensor to prevent problems caused by flooding or condensation, and to install the water meter display unit (300) (calculation and display) and wireless communication unit (200) on the outside.

[0301] The connection between the water meter body and the display unit (300) is made via a flow sensor line (normal operation up to 4 to 5 meters).

[0302] If the display unit (300) for meter reading is located on the main body of the water meter, problems such as insulation material for freezing prevention being damaged during periodic meter readings will inevitably continue.

[0303] The MPU (100) used in the integrated electronic water meter, which is the background technology, and the separate electronic water meter of the present invention is a low-power processor, so problems may occur when performing two functions simultaneously.

[0304] That is, when a user turns on the tap water, the flow sensor (400) of the water meter operates, and a processing process is performed to calculate the flow rate data. If this process overlaps with the wireless communication transmission time, it puts a load on the MPU (100) processing process.

[0305] To avoid this effect, it is necessary to perform the flow data generation and wireless communication processes simultaneously through multithreading without affecting each other.

[0306] In the case of electronic water meters currently in use, there are frequent cases where flow data is not properly transmitted when requested via TTL during flow data calculation.

[0307] The MPU (100) used in the water meter may be an 8-bit based CPU.

[0308] However, multithreading is a technology implemented in high-spec computers (64-bit) such as general PCs, and is used very exceptionally in microcontrollers.

[0309] In a separate water meter, even when the electronic water meter function and wireless communication function must be performed simultaneously, the functions can be performed independently without affecting each other.

[0310] In this case, as if there were two MPUs (100), each program could be operated without interfering with the performance of each other's functions.

[0311] A process that handles each program is called a thread, and when multiple threads can be executed simultaneously, it is called multithreading.

[0312] Windows, which we mainly use, is a prime example.

[0313] Figures 5a to 5c are explained as follows.

[0314] The separated water meter must control the flow sensor (400), LCD display (300), and wireless communication unit (200) with a single MPU (100).

[0315] In the case of a separate water meter, when water flows, a voltage is generated from the sensor, which acts as a trigger to measure the number and length of pulses, and the measured pulse values ​​are used to calculate the flow rate. In addition to the accumulated flow rate, this must be displayed on the LCD display unit (300).

[0316] When an interrupt occurs from a timer set within the MPU (100), the accumulated flow data is immediately read, a packet containing additional data such as status values ​​is created, power is supplied to the wireless modem, and the packet is transmitted. At this time, the flow sensor (400) continues to count without stopping.

[0317] The MPU (100) must have a separate timer (providing a trigger for obtaining status information) to enable operation to check the status information of the water meter, such as non-use, backflow, leakage, and overload, separately from the transmission of flow data.

[0318] Figure 5b illustrates the general structure of a packet used in IoT communications. The headers and ports of the Physical, MAC, and Application layers are primarily used in wireless modem systems, while the Payload space is used to specify the packet content to be sent by the user.

[0319] Looking at Fig. 5c, it is as follows.

[0320] The packet to be sent in the payload can contain various types of information such as water meter status information, communication status information, communication path, and repetition count in addition to flow rate data based on the key value.

[0321] Existing electronic water meters read a flow sensor (400), calculate the flow rate, and display it on an LCD. They also include a function to respond to external requests for flow rate data via serial communication (TTL).

[0322] In contrast, a separate electronic water meter integrates an electronic water meter with wireless communication capabilities. Rather than simply connecting two circuits on a single PCB to combine two functions, it is designed as a single system in which a single MPU (100) performs both functions.

[0323] This is how the program is optimized and integration makes sense.

[0324] Additionally, TTL communication is an asynchronous communication and is slow, so there is a problem that a lot of load is placed on it when performing flow calculations simultaneously.

[0325] TTL is a technology for serial communication (wired), and LoRa is a wireless communication technology that is a standard communication specification for IoT.

[0326] That is, TTL is provided as an interface for transmitting the flow rate value measured by the electronic water meter to the outside.

[0327] Therefore, in the integrated type, flow data is obtained through TTL communication and transmitted to the server (1000) using LoRa communication.

[0328] In the separate type, the water meter and wireless communication device are integrated into one system and share memory.

[0329] Water meter flow calculations utilize and store memory within the microcontroller, so flow data is stored within the microcontroller chip. Therefore, when controlling the LoRa communication chip to transmit flow data, the data is retrieved from the internal memory and transmitted.

[0330] To explain again, the integrated type stores the flow data in the water meter, and to transmit it via wireless communication, it requires sending the flow data via TTL communication connected to the water meter, and when the flow data is transferred to the wireless communication terminal, it is transmitted via wireless communication via a LoRa modem.

[0331] To calculate the flow rate, the water meter counts the pulses generated by the flow sensor (voltage turns on / off at 3V and 0V) and calculates the interval between the pulses.

[0332] A narrow pulse interval means a fast water flow.

[0333] Depending on the flow rate, the amount of water passing through at one time slightly varies. Taking this into account, the flow rate is calculated by multiplying the rotation speed by the amount of water passing through per rotation, and is continuously displayed on the LCD.

[0334] This process is a task that places a lot of burden on the microcomputer's capabilities.

[0335] At this time, when a command requesting flow data is entered using asynchronous communication TTL, timing must be adjusted to process it, which causes a transmission delay.

[0336] And if the delay becomes prolonged, the promised time is exceeded, and the wireless terminal, unable to wait indefinitely, times out and performs a different function.

[0337] This results in data loss.

[0338] In this case, the flow rate value 0 is transmitted to the server (1000), which can be invalidated and postponed, or 0 can be stored in the DB.

[0339] Synchronous communication is used when transmitting large amounts of data, such as video, and is primarily utilized in very fast communication methods.

[0340] The flow data transmission process is as follows.

[0341] The repeater (800) is used to overcome the transmission distance and shadow area between the water meter and the concentrator (900), and its main role is to receive packets transmitted from the water meter and transmit them back to the concentrator (900).

[0342] RF transmission does not send radio waves to a specific receiver. The channel (frequency) is the same, and when the radio wave intensity reaches a certain level, all repeaters (800) and concentrators (900) receive the radio waves.

[0343] Therefore, it is possible to selectively determine whether to receive or not by checking the key value or unique ID in the received packet.

[0344] Therefore, the terminal can participate in the network by requesting registration with the server (1000) and receiving the assigned unique key value during installation. (The receiving end ignores packets that it does not intend to receive.)

[0345] When two channels are used in a repeater (800), channels other than the assigned channel linked to the water meter become shared channels between repeaters (800), allowing the repeaters (800) to function as repeaters (800). Therefore, it is possible to minimize shadow areas and increase the transmission and reception distance.

[0346] Channels assigned to water meters must use a protocol specifically for water meters, which limits their use. Specifically, IoT communications are designed to transmit and receive small amounts of data, making them unsuitable for widespread use like WiFi.

[0347] Therefore, it is recommended to allocate communication time to each water meter to ensure uninterrupted communication.

[0348] If the communication schedule is assigned every 1 to 3 minutes, it takes 100 to 300 minutes to collect flow data from 100 water meters.

[0349] The time interval can be variably set to a preset value depending on the flow data collection range. Furthermore, when two channels are used, the MESH channel can be used solely for relay purposes, allowing all relays (800) to share the channel (frequency), eliminating spatial constraints.

[0350] Therefore, it has the advantage of being able to avoid very long distances or shaded areas.

[0351] The main purpose of the repeater (800) is to relay data, and the actual concentrator (900) serves as a gateway that receives flow information from the water meter and transmits it to the server (1000) via Ethernet.

[0352] In order to secure communication with the water meter, it is desirable for the server (1000) to provide a security key in response to a communication request from the water meter.

[0353] Therefore, a minimum safety device can be provided by including a security key in the flow information and re-verifying it on the server (100).

[0354] Figures 5a to 5c are explained as follows.

[0355] First, let me explain Fig. 5a as follows.

[0356] This is a block diagram of the separable water meter of the present invention, showing how a flow sensor, an LCD, and a communication device are controlled by a single MPU.

[0357] In the case of a separate water meter, when water flows, a voltage is generated from the flow sensor, and this is used as a signal to run a program for calculating the flow rate in the MPU (100). The voltage is repeated in the form of pulses, with two pulses generated per rotation of the impeller, and the amount of water passing through at this time appears in a pattern proportional to the flow rate.

[0358] It is possible to calculate the flow rate by reflecting this, and the calculated flow rate is added to the previous accumulated flow rate to update the accumulated flow rate. The updated accumulated flow rate is displayed on the LCD display (300) and stored in the memory at the same time.

[0359] An interrupt occurs every 8 hours from a timer set inside the MPU. When an interrupt occurs, the accumulated flow and the water meter status information (unused, backflow, leakage, overload, etc.) are read to create a communication packet, power is supplied to the wireless communication unit (200; wireless modem chip) to activate it, and the wireless communication unit is controlled to transmit the packet to the server.

[0360] To perform flow rate calculations even while communication is active and packets are being transmitted, both the flow rate calculation and wireless communication are configured as threads and executed simultaneously.

[0361] The explanation of Fig. 5b is as follows.

[0362] This is a general structure of a packet used in IoT communication that is communicated through a wireless communication unit (200).

[0363] The headers and ports of the Physical Layer, MAC Layer, and Application Layer are mainly used in the IoT communication modem system, and the Payload space is a space where the size of the packet to be sent, the kit value, the measurement value, and status information can be entered.

[0364] The explanation of Figure 5c is as follows.

[0365] The packet to be sent in the payload includes information such as cumulative flow rate based on the kit value, water meter status information, communication status information, communication path, number of communication attempts, error detection code, etc.

[0366] Terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0367] The separate electronic water meter of the present invention has industrial applicability because it overcomes problems of moisture and condensation by installing all electronic devices except the flow sensor separately from the metering sensor unit and externally.

[0368] The flow sensor installed inside the box of the separate electronic water meter of the present invention is molded with epoxy resin or the like to be highly waterproof and / or dustproof, and thus has the effect of transmitting and receiving accurate signals, and thus has industrial applicability.

[0369] The wireless communication unit of the separate electronic water meter of the present invention is installed externally by combining it with the display unit, which has the advantageous effect of ensuring smooth wireless communication, and thus has industrial applicability.

[0370] When installing the separate electronic water meter of the present invention, the water meter is installed on site using an application and information is entered, so a remote manager can check the installation status on the server and check the communication to see if the meter reading data is entered properly, so there is no need to worry about A / S resulting from this, and this has the advantage of industrial applicability.

Claims

1. Flow sensor configured inside the water meter box; The signal of the above flow sensor is controlled by the MPU configured in the external space of the water meter box, A display unit that displays the flow rate data transmitted from the above flow rate sensor; A wireless communication unit that periodically transmits the flow rate data displayed on the display unit to the server via wireless communication; A separate electronic water meter including the MPU configured to control the flow sensor, the display unit, and the wireless communication unit.

2. A separate electronic water meter including a configuration in which the MPU in the first paragraph controls the flow rate calculation and the wireless communication unit by setting threads, respectively.

3. Flow rate data calculation step that calculates flow rate according to tap water usage; A flow rate data transmission step for transmitting the flow rate data calculated in the above flow rate data calculation step; A wireless communication method for calculating flow rate of an electronic water meter, including setting the flow rate data calculation step and the flow rate data transmission step as threads, so that they do not mutually affect each other when the wireless communication from the wireless communication unit to the server in the above flow rate data transmission step and the flow rate data calculation step when using water in the flow meter overlap.

4. A flow sensor that generates pulses according to the rotation of the impeller when tap water flows; When the above flow sensor detects the rotation of the impeller, it counts the number of rotations by triggering a pulse according to the rotation, The flow rate calculated by calculating the flow rate by the pulse interval and the number of pulses is displayed on the display in addition to the accumulated flow rate, and the accumulated flow rate and pulse generation time are updated and stored. The flow data sent to the server is transmitted by the wireless communication unit according to the cycle set by the server. The load generated when transmitting the flow data of the above wireless communication unit, Since tap water is used frequently, the load generated by the flow rate calculation that measures the flow rate is configured to operate independently so that it does not mutually affect the load generated by the flow rate calculation. A wireless communication device for calculating flow rate of an electronic water meter, including a configuration in which power is supplied to a wireless communication modem immediately before transmission to transmit a wireless communication packet through a designated channel in order to reduce battery consumption when transmitting flow rate data.

5. A wireless communication device for calculating flow rate of an electronic water meter, including a configuration in which the wireless communication packet transmitted in paragraph 4 is received by both a repeater and a concentrator using the same channel, so that the server removes duplicate wireless communication packets through a packet filter and takes the wireless communication packet received with the highest communication sensitivity.

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