KR20200142269A - Monitoring system including removable airtight environment measuing device - Google Patents

Abstract

The present invention relates to a monitoring system for forestalling an accident that may occur in a closed work environment. The system includes: a wireless communication device installed at a site including a closed space and transmitting environment information on the closed space; a ventilation fan disposed in the closed space, controlling the air flow in the closed space, and supplied with electric power through the wireless communication device; a server receiving the environment information on the closed space from a wireless communication module and generating monitoring information on the site based on the environment information; and an administrator terminal receiving and outputting the monitoring information. The wireless communication device includes: a sensor module generating environment information by measuring at least one of the particulate matter concentration, carbon monoxide concentration, carbon dioxide concentration, and nitrogen oxide concentration in the closed space; a network communication module transmitting the environment information to the server; a power module converting first electric power supplied from an external power source into second electric power and supplying the same to the sensor module and the network communication module; a relay module connected between the external power source and the ventilation fan and transmitting the first electric power to the ventilation fan by being turned on or blocking the first electric power transmission by being turned off; and a control module controlling the operation cycles of the sensor module and the network communication module and controlling the operation of the relay module in response to a control signal provided from the server.

Description

Monitoring system including a detachable closed environment measuring device {MONITORING SYSTEM INCLUDING REMOVABLE AIRTIGHT ENVIRONMENT MEASUING DEVICE}

The present invention relates to a monitoring system, and more particularly, to a monitoring system for monitoring a work site such as a closed space.

A job site can include a variety of confined spaces, such as basements or tanks (ship tanks, blocks). Communication does not work smoothly in such a confined space.

Accidents such as explosion and suffocation frequently occur in the process of working in a confined space (ie, in a confined working environment), but it is difficult for the manager to judge or control the confined working environment.

Korean Patent Registration No. 10-1843993 (announced on March 30, 2018)

An object of the present invention is to provide a monitoring system capable of preventing accidents occurring in a closed working environment in advance.

In order to achieve an object of the present invention, a monitoring system according to embodiments of the present invention includes: a wireless communication device installed in a field including a closed space and transmitting environmental information of the closed space; A ventilation fan disposed in the closed space to control air flow in the closed space, and receiving power through the wireless communication device; A server for receiving the environmental information of the enclosed space from the wireless communication module and generating monitoring information for the site based on the environmental information; And a manager terminal receiving and outputting the monitoring information. Here, the wireless communication unit includes: a sensor module configured to generate the environmental information by measuring a concentration of at least one of fine dust, carbon monoxide, carbon dioxide, and nitrogen oxide in the closed space; A network communication module for transmitting the environment information to the server; A power module converting first power supplied from an external power source into second power and supplying it to the sensor module and the network communication module; A relay module connected between the external power source and the ventilation fan, and is turned on to transmit the first power to the ventilation fan, or is turned off to block transmission of the first power; And a control module controlling an operation period of the sensor module and an operation period of the network communication module, and controlling an operation of the relay module in response to a control signal provided from the server.

According to an embodiment, the network communication module includes a wired communication terminal provided outside of the wireless communication unit, and the sensor module is detachably attached to the wireless communication unit and may be connected to the network communication module through the wired communication terminal. .

According to an embodiment, the monitoring system further includes a gateway, and the network communication module of the wireless communication device generates a LORA (long range) packet based on the environment information, and uses the LORA communication technology. And the gateway may transmit the LoRa packet to the server.

According to an embodiment, the wireless communication unit further includes a current sensor connected between the relay module and the ventilation fan to sense a current delivered to the ventilation fan, and the control module further comprises a current sensor based on the current. The fan status information is generated, and the control module may generate an alarm indicating a failure of the ventilation fan when the current is less than a reference current while the relay module is turned on.

According to an embodiment, the wireless communication device further comprises an optical sensor for measuring the amount of light in the enclosed space, and the control module controls the operation of the sensor module and the network communication module based on the output of the optical sensor. I can.

The monitoring system according to embodiments of the present invention may collect environmental information of the enclosed space through a measuring device installed in the enclosed space 1, and provide environmental information to the server using LoRa communication technology. Accordingly, the manager (or worker) may obtain environmental information (or monitoring information) through the manager terminal (or user terminal) and determine the situation of the closed work environment.

In addition, the monitoring system may further include a ventilation fan supplied with power through the measuring device, and may supply or cut off power to the ventilation fan through the measuring device. Accordingly, even if there is no separate control module attached or coupled to the ventilation fan, the operation of the ventilation fan can be remotely controlled, and it is possible to determine whether the ventilation fan is operating (and whether a failure occurs).

However, the effects of the present invention are not limited to the above effects, and may be variously extended without departing from the spirit and scope of the present invention.

1A is a block diagram illustrating a monitoring system according to embodiments of the present invention.
1B is a diagram illustrating an example of the monitoring system of FIG. 1A.
2 is a block diagram illustrating an example of a measuring device included in the monitoring system of FIG. 1A.
3 is a block diagram illustrating an example of a sensor module included in the measuring device of FIG. 2.
4 is a flowchart illustrating the operation of the measuring device of FIG. 2.
5 is a diagram illustrating an example of a LoRa packet generated in the monitoring system of FIG. 1.
6 is a block diagram illustrating an example of the monitoring system of FIG. 1.
7 is a diagram illustrating an example of a gateway included in the monitoring system of FIG. 6.

Since the present invention can apply various transformations and have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

LoRa stands for Long Range and expresses the long communication distance, the most prominent characteristic of LoRa communication. The communication structure of LoRa communication adopts the Aloha protocol method based on the star topology, and the maximum radio wave reach is 20km, and the communication speed is between 0.3kbps and 50kbps. Considering the speed and transmission time, it mainly uses a range of 2km. Another characteristic of LoRa communication is Low Energy, multi-sensor function, encryption, safe two-way communication and mobility, and LoRa can be operated in an unlicensed band compared to LTE-M and LTE NB-IoT, and standardization is completed. Became.

1A is a block diagram illustrating a monitoring system according to embodiments of the present invention. 1B is a diagram illustrating an example of the monitoring system of FIG. 1A.

1A and 1B, the monitoring system 100 may include a measuring device 110, a ventilation fan 120, a gateway 130, and a server 140. In addition, the monitoring system 100 may be connected to the manager terminal 150 and the user terminal 160 and transmit and receive data between the manager terminal 150 and the user terminal 160.

The measuring device 110 (or detachable sealed environment measuring device, wireless communication device, LoRa terminal) is installed at the site including the enclosed space 1, and collects environmental information of the enclosed space 1 and transmits it to the gateway 130 can do.

For example, the enclosed space 1 may be a ship block (i.e., a part of a ship under construction), and includes one entrance 2, and the remaining parts excluding the entrance 2 are surrounded by bulkheads, etc. I can. In particular, when the entrance 2 is located above the enclosed space 1, a specific gas (for example, carbon monoxide) or the like cannot move to the outside and may accumulate in the enclosed space 1. The environmental information may include a concentration, temperature/humidity, and the like of a specific gas (eg, carbon monoxide) in the enclosed space 1.

The measuring device 110 may be installed at any position in the enclosed space 1, for example, the measuring device 110 is at a specific position (for example, from the floor surface or the floor surface of the enclosed space 1). Face position), or may be disposed adjacent to the entrance (2).

The measuring device 110 may receive power from the outside through the power line 4. For example, a light-emitting device 5 (eg, a light fixture) may be essentially provided to provide a working environment (eg, light) of an operator in the enclosed space 1, and the light-emitting device 5 A power line 4 for supplying power to) may be provided. The power line 4 may be installed into the enclosed space 1 adjacent to the ladder 3 or the like. Accordingly, the measuring device 110 may be connected to the power line 4 for the light emitting device 5 to receive power.

In one embodiment, the measurement device 110 generates a LoRa packet based on environment information, and may transmit a LoRa packet to the gateway 130 through a LoRa communication technology or through a LoRa communication network.

The ventilation fan 120 may be disposed in the closed space 1 to control the air flow in the closed space 1. For example, the ventilation fan 120 may be disposed on the bottom surface of the closed space 1 and discharge the air in the closed space 1 to the outside through the ventilation pipe 6. The ventilation pipe 6 is configured as a separate tube, and may extend into the closed space 1 through the entrance 2, but this is exemplary and is not limited thereto. For example, the ventilation fan 120 may be built in a pipe formed to penetrate the enclosed space 1 (for example, a ship block) to be integrally formed with the pipe.

In one embodiment, the ventilation fan 120 may receive power from the measuring device 110. For example, the ventilation fan 120 is connected to the measuring instrument 110 through the auxiliary power line 7, and can receive power from the power line 4 through the measuring instrument 110 and the auxiliary power line 7 have. Even if the ventilation fan 120 is connected to a separate power source for the enclosed space 1 (for example, a ship power system), when a separate power source for the enclosed space 1 is cut off, the ventilation fan 120 It may be separated from a separate power source and electrically connected to the ventilation fan 120. In this case, the operation of the ventilation fan 120 may be controlled by the measuring device 110.

In general, in order to control the ventilation fan 120, a control device for controlling the operation of the ventilation fan 120 is separately provided, and the control device may vary according to the type of the ventilation fan 120, but the monitoring system of the present invention 100 may control the operation of the ventilation fan 120 by controlling the power provided to the ventilation fan 120 using only the measuring device 110.

The gateway 130 (or LoRa gateway) may receive a LoRa packet from the measuring device 110 using a LoRa communication technology and transmit the LoRa packet to the server 140 through a wired/wireless communication network. For example, the gateway 130 may convert a LoRa packet into a packet used in a wired/wireless communication network, aggregate LoRa packets received from a plurality of measuring devices 110 and transmit the aggregated LoRa packets to the server 140.

The server 140 (or monitoring server) receives environmental information from the measuring device 110 through the gateway 130, and generates monitoring information for the site (or confined space 1) based on the environmental information. I can. For example, the monitoring information includes the concentration, temperature/humidity, etc. of a specific gas (for example, carbon monoxide) in the enclosed space 1, similar to environmental information, and also, status information of the ventilation fan 120 It may include. For example, the state information of the ventilation fan 120 indicates whether the ventilation fan 120 is operating, and may be determined based on power (or a current corresponding thereto) supplied to the ventilation fan 120. Whether the ventilation fan 120 is operated will be described later with reference to FIG. 2.

For example, the server 140 may be a computing device including at least one processor.

The server 140 may store or update the environmental information provided by the measuring device 110 in real time and periodically in connection with the identification information (eg, identification number) given to the measuring device 110 in the enclosed space 1. I can.

When the server 140 analyzes the environmental information and exceeds the threshold value (ie, when the specific gas concentration included in the environmental information exceeds the threshold value), the server 140 may generate a warning signal. The warning signal is provided to the measuring device 110, the manager terminal 150, and the user terminal 160, and is output through a display or output unit included therein, and the identified state of the enclosed space 1 is determined by the operator and the manager. Can be provided directly or indirectly to That is, the server 140 may enable a worker and a manager to cope with a dangerous situation through a warning signal.

In one embodiment, the server 140 may provide a warning signal to other measuring devices 110 and user terminals 160 adjacent to the enclosed space 1. For example, the server 140 provides a warning signal to other measuring devices connected to the gateway 130 to which the measuring device 110 is connected in the confined space 1 in which a dangerous situation has occurred, and through other measuring devices (for example, For example, a warning signal may be provided to the identified user terminals) through a short-range communication module provided in another measuring device. That is, workers located in other work spaces adjacent to the enclosed space 1 where the dangerous situation has occurred can recognize and cope with that the dangerous situation has occurred.

In one embodiment, the server 140 may provide notification information corresponding to the warning signal to the manager terminal 150 and the user terminal 160. Here, the notification information is information indicating that a dangerous situation has occurred in the enclosed space 1, and may be provided as a text message, vibration, voice/sound, or the like.

The manager terminal 150 is a terminal used by the manager of the monitoring system 100 and is connected to the server 140 through a wired or wireless communication network, and may receive and output monitoring information generated by the server 140.

For example, the manager terminal 150 is a computing device including at least one processor, and may be implemented as a computer, a smartphone, or a tablet PC. The manager terminal 150 may access the server 140 through a program installed in the server 140 or a web screen, and monitoring information may be displayed through a display unit of the manager terminal 150.

User terminal 160 (or worker terminal) is a terminal used by a worker who works or is planning to work in a confined space 1, is connected to the server 140 through a wired or wireless communication network, and monitoring information generated by the server 140 Can be received and printed.

For example, the user terminal 160 is a computing device including at least one processor, and may be implemented as a smart phone, a tablet PC, or the like that a worker can carry. Similar to the manager terminal 150, the user terminal 160 accesses the server 140 through a program installed in the server 140 or a web screen, and may output monitoring information.

As described with reference to FIGS. 1A and 1B, the measuring device 110 is installed in the enclosed space 1, collects environmental information of the enclosed space 1, and transmits environmental information to the server 140 using LoRa communication technology. ), and the manager (or worker) acquires environmental information (or monitoring information) through the manager terminal 150 (or user terminal), and can determine the situation of the closed work environment.

In addition, the ventilation fan 120 is supplied with power through the measuring device 110, and by supplying or blocking power to the ventilation fan 120 through the measuring device 110, separately attached or coupled to the ventilation fan 120 Even if there is no control module, the operation of the ventilation fan 120 can be remotely controlled, and it is possible to determine whether the ventilation fan 120 is operating.

2 is a block diagram illustrating an example of a measuring device included in the monitoring system of FIG. 1A.

2, the measuring device 110 includes a sensor module 210, a network communication module 220, a power module 230, a control module 240, a relay module 250 (or a switching module), and a current It may include a sensor 260 (or a current sensing module).

The sensor module 210 may generate environmental information by measuring a concentration of at least one of fine dust, carbon monoxide, carbon dioxide, and nitrogen oxide in the enclosed space (see FIG. 1B). For example, the sensor module 210 may include at least one sensor capable of measuring environmental information (eg, concentration of a specific gas, temperature/humidity). A detailed configuration of the sensor module 210 will be described later with reference to FIG. 3.

The network communication module 220 may transmit or transmit environment information generated by the sensor module 210 to the server 140. For example, the network communication module 220 may generate a LoRa packet based on environment information and transmit the LoRa packet to the gateway 130 through a LoRa network. For example, the network communication module 220 may be implemented as an RF communication module to which LoRa communication technology is applied. Since the RF communication module to which the LoRa communication technology is applied is known, a detailed description thereof will be omitted.

In one embodiment, the network communication module 220 may further include a short-range communication module. The short-range communication module uses Bluetooth technology (or BLE technology) to form a Bluetooth communication network between the user terminals 160 located in the enclosed space 1, and transmits the terminal identification information to the user terminal 160 Terminal identification information of the terminal 160 may be obtained. For example, the terminal identification information is unique information of the user terminal 160 that is given to distinguish the user terminal 160 from other terminals, for example, the serial number (S/N) of the user terminal 160, It may be a mobile communication phone number or the like. The terminal identification information obtained from the user terminal 160 may be used to identify a worker in the enclosed space 1 and may be transmitted to the server 140 together with environmental information.

The power module 230 may convert the first power AC supplied from an external power source into second power DC and supply it to the sensor module 210, the network communication module 220, and the control module 240. For example, the power module 230 may be implemented as a DC adapter.

The control module 240 may control an operation (or operation period) of the sensor module 210 and an operation (or operation period) of the network communication module 220. In addition, the control module 240 may control the operation of the relay module 250 in response to environmental information acquired or generated from the sensor module 210 or a control signal provided from the server 140.

In an embodiment, the control module 240 may generate a warning signal by analyzing environmental information. For example, the control module 240 generates a warning signal when the concentration of a specific gas included in the environmental information is greater than the threshold or out of the reference range, outputs a warning signal through a separate output device, and also, the warning The signal can be provided to the server 140.

In one embodiment, the control module 240 checks the state of each of the sensor module 210, the network communication module 220, and the power module 230, that is, determines whether the corresponding module operates normally, and identifies The status can be output or displayed through a separate output module.

In an embodiment, the control module 240 performs a preset operation after being activated according to a specific event signal in the sleep state, and may be deactivated again when the operation is completed. For example, the control module 240 may include a timer that generates an event signal at a preset period, and the preset period may be set through the server 140 or the operator terminal 150.

The relay module 250 may be connected between the external power supply and the ventilation fan 120. For example, the relay module 250 is implemented as an AC relay, and is turned on in response to a signal (eg, a contact signal) provided from the control module 240 (ie, forming a power supply path), or Can be turned off. For example, the relay module 250 may be turned on to provide first power AC provided from the outside to the ventilation fan 120, or may be turned off to block transmission of the first power AC.

The current sensor 260 is connected between the relay module 250 and the ventilation fan 120 to sense a current (ie, a current corresponding to the first power AC) delivered to the ventilation fan 120. For example, the current sensor 260 may be implemented as a current meter.

In one embodiment, the control module 240 may generate state information of the ventilation fan 120 based on the current measured by the current sensor 260. For example, when the measured current is less than the reference current (eg, standby current corresponding to standby power), it may be determined that the ventilation fan 120 is not operating. For example, when the measured current is greater than the reference current, it may be determined that the ventilation fan 120 is operating. The status information of the ventilation fan 120 may be provided to the server 140 together with environmental information through the network communication module 220. Meanwhile, although it has been described that the control module 240 generates state information of the ventilation fan 230, it is not limited thereto. For example, the measured current, that is, current information is provided to the server 140, and the server 140 may generate state information of the ventilation fan 230.

In one embodiment, the control module 240 may generate an alarm (or an alarm signal) when the current is less than the reference current while the relay module 250 is turned on. For example, the control module 240 turns on the relay module 250 in order to operate the ventilation fan 120 for ventilation of the closed space 1 according to the high concentration of a specific gas in the closed space 1. I can. When the ventilation fan 120 operates normally, the current supplied to the ventilation fan 120 may be greater than the reference current. When the current is less than the reference current, the control module 240 determines that the ventilation fan 120 has not normally operated, and may generate an alarm accordingly. For example, the alarm may be provided to the server 140 as a failure signal for a separate ventilation fan 120. As another example, when the meter 110 includes a separate output module (eg, a speaker module, a display lamp), an alarm may be output through the output module. In this case, the operator may check the state of the ventilation fan 120 (eg, whether or not the power is off) based on the alarm.

The network communication module 220, the power module 230, the control module 240, the relay module 250, and the current sensor 260 may be provided in one housing.

In embodiments, the sensor module 210 is implemented as a separate module independent from the network communication module 220, the power module 230, the control module 240, the relay module 250, and the current sensor 260. , Can be attached to the housing.

The housing may include terminals P1, P2, and P3 exposed outside the housing or formed in the housing to be connected to the sensor module 210. For example, the control module 240 includes a first terminal P1 formed outside the measuring device 110, and the sensor module 210 is directly connected to the control module 220 through the first terminal P1. Can be connected. For example, the network communication module 220 includes a second terminal P2 (or a wired communication terminal) formed outside the measuring device 110, and the sensor module 210 is provided through the second terminal P2. It may be directly connected to the network communication module 220. For example, the power module 220 includes a third terminal P3 (or a power terminal) formed outside the measuring device 110, and the sensor module 210 is a power module through the third terminal P3. It is connected to 230 and may receive second power DC.

In one embodiment, the measuring device 110 may further include an optical sensor 270. The optical sensor 270 may be implemented as a general photodiode, and may generate an electric signal corresponding to the amount of light in the sealed space 1 and provide it to the control module 240. In this case, the control module 240 operates based on the output of the optical sensor 270 (ie, an electrical signal provided from the optical sensor 270), and the sensor module 210 and the network communication module 220 Control the operation of

For example, when the amount of light in the enclosed space 1 increases or is greater than the reference amount of light, the control module 240 may determine that the work in the enclosed space 1 is started or is scheduled to start. Accordingly, the control module 240 wakes up from a sleep mode (for example, a mode for preventing unnecessary information transmission), enters a normal mode (or sensing mode), and the sensor module 210 and The network communication module 220 can be operated normally. As another example, when the amount of light in the enclosed space 1 decreases or is less than the reference amount of light, the control module 240 includes no user terminal detected through the network communication module 220 (or short-range communication module), It can be determined that the work in the enclosed space (1) is finished. Accordingly, the control module 240 enters the sleep mode, and may stop the operation of the sensor module 210 and the network communication module 220, or increase the operation period.

Meanwhile, in FIG. 2, the optical sensor 270 is shown to be independent of the sensor module 210, but this is exemplary, and the optical sensor 270 may be included in the sensor module 210.

As described with reference to FIG. 2, the sensor module 210 may be provided in a form detachable from the measuring device 110. Accordingly, only necessary sensors may be provided depending on the type of the sealed space 1 and/or the type of work in the closed space 1 (eg, cleaning, welding, painting, etc.). In addition, the control module 240 may generate environmental information through the sensor module 210 and may generate state information of the ventilation fan 120 through the relay module 250 and the current sensor 260. Accordingly, the administrator can determine and control the closed working environment and the state of the ventilation fan 120.

3 is a block diagram illustrating an example of a sensor module included in the measuring device of FIG. 2.

Referring to FIG. 3, the sensor module 210 may include a sensor unit 310 (or a body unit) and sensors 321 to 328 and 330.

The sensors 321 to 328 and 330 are fine dust (PM) sensor 321, carbon monoxide (CO) sensor 322, carbon dioxide (CO2) sensor 323, ozone (O3) sensor 324, nitrogen oxide ( NOx) sensor 325, hydrocarbon (HC) sensor 326, aldehyde (CHO) sensor 327, volatile organic compounds (TVOCs) sensor 328, and temperature / humidity sensor 330. I can.

The sensor unit 310 provides an interface through which the sensors 321 to 328 and 330 can be coupled to the measuring device 110, and signals measured by each of the sensors 321 to 328 and 330 (ie, sensing information) May be collected and transmitted to the network communication module 220. For example, the sensor unit 310 is implemented as a sensor board, delivers power to the sensors 321 to 328 and 330, and transmits signals measured by each of the sensors 321 to 328 and 330 to a network communication module ( 220).

The fine dust (PM) sensor 321 may measure fine dust such as PM10 and PM2.5. For example, the fine dust (PM) sensor 321 may be implemented as a general fine dust sensor that measures the concentration of fine dust through a light scattering method. Similarly, a carbon monoxide (CO) sensor 322, a carbon dioxide (CO2) sensor 323, an ozone (O3) sensor 324, a nitrogen oxide (NOx) sensor 325, a hydrocarbon (HC) sensor 326, an aldehyde The (CHO) sensor 327, the volatile organic compounds (TVOCs) sensor 328, and the temperature/humidity sensor 330 include carbon monoxide (CO), carbon dioxide (CO2), ozone (O3), nitrogen oxides (NOx), It measures the concentration and temperature/humidity of hydrocarbons (HC) (or methane gas), aldehydes (CHO), and volatile organic compounds (TVOCs), respectively, and can be implemented as a general sensor. Accordingly, descriptions of functions and specific configurations of the sensors 321 to 328 and 330 will be omitted.

In one embodiment, the sensor module 210 may include a plurality of sensors of the same type. For example, fine dust (PM) sensor 321, carbon monoxide (CO) sensor 322, carbon dioxide (CO2) sensor 323, ozone (O3) sensor 324, nitrogen oxide (NOx) sensor 325) , Hydrocarbon (HC) sensor 326, aldehyde (CHO) sensor 327, volatile organic compounds (TVOCs) sensor 328, and temperature/humidity sensor 330 at least one of two or three Can be equipped. In this case, the control module 240 (or server 140) averages the signals (eg, hydrocarbon concentrations) measured by sensors of the same type (eg, hydrocarbon sensor 326) to The average value of the gas concentration can be calculated. Thus, even if an error occurs in a specific sensor, the concentration of a specific gas can be measured with improved accuracy.

In one embodiment, the control module 240 (see FIG. 2) is configured to set a reference value for any one of the signals (e.g., hydrocarbon concentrations) measured by sensors of the same type (e.g., hydrocarbon sensor 326). If it exceeds, it is determined that the gas concentration in the closed space 1 is not appropriate, and a warning signal may be generated. When all the signals measured by the same type of sensors are less than or equal to the reference value, the control module 240 may determine that the corresponding gas concentration is appropriate.

In one embodiment, the sensor unit 310 includes a carbon monoxide (CO) sensor 322, a carbon dioxide (CO2) sensor 323, an ozone (O3) sensor 324, a nitrogen oxide (NOx) sensor 325, a hydrocarbon ( Separate display lamps corresponding to the HC) sensor 326, the aldehyde (CHO) sensor 327, the volatile organic compounds (TVOCs) sensor 328, and the temperature/humidity sensor 330 may be provided. In this case, the sensor unit 310 includes a carbon monoxide (CO) sensor 322, a carbon dioxide (CO2) sensor 323, an ozone (O3) sensor 324, and a nitrogen oxide (NOx) sensor 325 through each of the display lamps. ), hydrocarbon (HC) sensor 326, aldehyde (CHO) sensor 327, volatile organic compounds (TVOCs) sensor 328, and temperature/humidity sensor 330 are combined, and normal operation of the corresponding sensor Whether or not the signal measured by the sensor (ie, a specific gas concentration) is normal or not may be displayed. The sensor unit 310 displays a lamp corresponding to the sensor in white when the sensor is mounted, green when the sensor is operating normally and the gas concentration is at a normal level, orange when the sensor is in abnormal operation, and the gas concentration is abnormal. If it is a level, it can be marked in red.

As described with reference to FIG. 3, the sensor module 210 may measure the concentration and/or temperature/humidity of a specific gas through individual sensors 321 to 328 and 320. In addition, it is also possible to directly notify the operator of whether the sensor is mounted or whether it is operating normally through lamps provided in the sensor unit 310.

4 is a flowchart illustrating the operation of the measuring device of FIG. 2.

2 to 4, the meter 110 may initialize the port (S410). For example, the measuring device 110 may initialize a signal output through the second port P2 described with reference to FIG. 2. For example, the measuring device 110 may initialize signals output through the sensor unit 310 described with reference to FIG. 3 and a port connecting the sensors 321 to 328 and 330.

Thereafter, the measuring device 110 may operate the sensors 321 to 328 and 330 and check the sensor measurement value (S420). For example, the sensors 321 to 328 and 330 operate sequentially, and sensor measurement values from the sensors 321 to 328 and 330 may be sequentially provided to the sensor unit 310.

The meter 110 may convert the sensor measurement value into a voltage (S430), and convert the voltage into a measurement unit (S440). For example, a sensor measurement value is output from each of the sensors 321 to 328 and 330 in the form of current (for example, 4 to 20 mA), and the sensor unit 310 may convert the sensor measurement value to a voltage. . In addition, since the gas concentration range is different for each of the sensors 321 to 328 and 330, the converted voltage may be converted into a measurement unit corresponding to each of the sensors 321 to 328 and 330.

Thereafter, the measurement device 110 may transmit a measurement value (ie, a measurement data value converted to a measurement unit) to the server 140. For example, the measuring device 110 provides the measured value from the sensor module 210 to the network communication module 220, and the network communication module 220 generates a LoRa packet based on the measured value, and the server 140 Can be provided.

The measuring device 110 may determine whether the waiting time has elapsed (S460). That is, the meter 110 determines whether the next transmission period has arrived, and can maintain a standby state (or a sleep state) until the next transmission period arrives. In contrast, when the next transmission period has arrived, the measuring device 110 may repeatedly perform the step S420 of checking the sensor measurement value to the step S450 of transmitting the measurement value. The waiting time of the measuring device 110 may be preset or adjusted by the server 140.

5 is a diagram illustrating an example of a LoRa packet generated in the monitoring system of FIG. 1.

Referring to FIG. 5, the packet structure of LoRa is composed of Preamble, Header, and Payload. Preamble is used to synchronize the received data flow with the receiver.

Packets are basically composed of 12 symbols, but can be variable. The gateway 130 performs a preamble detection process that is periodically restarted, and for this purpose, the length of the preamble of the measuring device 110 and the LoRa gateway 120 may be configured to be the same.

Header is divided into Explict Mode and Implicit Mode, and Explict Mode can provide information about Payload such as Payload Length, Error Correction Rate, and Payload CRC. In Implicit Mode, the header is removed from the packet. The payload length, error correction rate, and the existence of Payload CRC must be manually configured on both sides of the transceiver. Payload is a variable length field that contains actual data, and payload CRC can be optionally added.

Spreading Factor is the spreading factor of how many bit strings the original data bits are spread in terms of the number of bits. Coding Rate may represent a rate including actual information bits as shown in Equation 1 below.

[Equation 1]

6 is a block diagram illustrating an example of the monitoring system of FIG. 1.

1 and 6, the monitoring system 600 includes measuring devices 610-1, 610-2 to 610-N, gateways 620-1, 620-2, and 620-3, and a server 630. It may include. In addition, the monitoring system 600 may be interlocked with the user terminals 640-1 and 640-2 to 640 -N. The measuring devices 610-1, 610-2 to 610-N, the gateways 620-1, 620-2, 620-3, and the server 630 are the measuring devices 110 and gateway 130 described with reference to FIG. 1. ) And the server 140, respectively, so that the overlapping description will not be repeated.

The gateways 620-1, 620-2, and 620-3 may transmit data to the measuring devices 610-1, 610-2 to 610-N using a downlink channel (DN).

The measuring devices 610-1, 610-2 to 610-N are gateways 620-1, 620-2, 620-3 using an uplink channel UP that is distinct from a downlink channel DN. Data (for example, LoRa packets) can be transmitted to.

In this case, the measuring devices 610-1, 610-2 to 610-N cannot receive data transmitted by other terminals, and the monitoring system 600 may support only a star topology. Here, in the star-type topology, the gateways 620-1, 620-2, 620-3 (or the monitoring server 630) all control the communication of the measuring devices 610-1, 610-2 to 610-N. )), it is easy to add a measuring device (or terminal), and can easily cope with the occurrence of data errors.

7 is a diagram illustrating an example of a gateway included in the monitoring system of FIG. 6.

The measuring devices 610-1, 610-2 to 610-M use one radio communication (RF) chip as they perform 1:1 communication with the first gateway 620-1, but the first gateway 620 -1) may include a plurality of RF chips since it must communicate with the measuring devices 610-1, 610-2 to 610-M.

Referring to FIG. 7, a first gateway 620-1 includes one transmission unit 710 (or RF transmission unit), a plurality of reception units 720-1 to 720-M (or RF reception units), and a plurality of The amplifiers 731, 732-1 to 732-M and a processing unit 740 may be included.

Here, the transmitting unit 710 and the receiving units 720-1 to 720-M may be implemented as an RF chip for WPAN that supports a symmetric half-duplex, using two types of WPAN chips. An asymmetric link system can be configured.

The transmission unit 710 may transmit transmission data (TX DATA) received from the processing unit 740 (or the data processor) to the measuring devices 610-1, 610-2 to 610 -M.

Each of the receiving units 720-1 to 720-M may receive data (eg, a LoRa packet) from the measuring devices 610-1 and 610-2 to 610-M corresponding to each of them. The receiving units 720-1 to 720-M may be implemented in plural in order to set the frequency channel allocation for the uplink channel UP and the downlink channel DN.

The first gateway 620-1 has a degree of freedom for low cost and low power compared to the measuring devices 610-1, 610-2 to 610-M, and provides a link budget in a downlink channel (DN). In order to improve, the output signal may be improved by using an amplifier 731 (or a low noise amplifier). The amplifier 731 connected to the downlink channel (DN) may amplify the output signal to improve the link budget. When the transmission antenna emits a signal with an appropriate maximum power, radio waves may reach the location where the measuring devices 610-1, 610-2 to 610-M are located.

On the other hand, the first gateway 620-1, in order to improve the reception sensitivity (receive sensitivity) of the data (or signal) received from the measuring devices (610-1, 610-2 to 610-M), amplifiers (732-1 to 732-M) can be used.

Each of the amplifiers 732-1 to 732-M connected to the uplink channel UP removes noise from the signals received from the measuring devices 610-1 and 610-2 to 610-M, and The intensity can be amplified. The signal received from the outside has a very small size and may contain noise. Accordingly, the first gateway 620-1 can amplify the size of the received signal while minimizing noise using the amplifiers 732-1 to 732-M connected to the uplink channel UP. I can.

On the other hand, each of the measuring devices 610-1, 610-2 to 610-M uses a single WPAN RF chip to communicate with the first gateway 620-1 using the network communication module 220 (see FIG. 2). You can send and receive data.

When the transmission setting and reception setting of the RF chip of the network communication module 220 are set to different frequency bands and different data transmission rates, it can be operated as a half duplex, but an asymmetric link using one RF chip for WPAN A system (asymmetric link system) can be configured.

On the other hand, the downlink channel (DN) used by the first gateway (620-1) is the uplink channel (UP) used by the measuring devices (610-1, 610-2 to 610-M) to transmit data. Compared to that, it can use a high frequency and wide frequency band.

On the other hand, the measuring devices 610-1, 610-2 to 610-M are difficult to transmit high-output data due to power constraints, and it is difficult to use an antenna having a high gain due to a problem of installation and cost. Data can be transmitted using a relatively narrow bandwidth to satisfy the budget.

In one embodiment, when the first gateway 620-1 communicates with the measuring devices 610-1, 610-2 to 610-M, the uplink channel UP is the measuring devices 610-1, Each of 610-2 to 610-M) may include channels having separate frequency bands.

The first gateway 620-1 may divide the frequency band of the uplink channel UP to correspond to the number M of the measuring devices 610-1, 610-2 to 610-M, and the divided frequency Data can be received from the measuring devices 610-1, 610-2 to 610-M using the band.

As described above, the monitoring system according to the embodiments of the present invention has been described with reference to the drawings, but the above description is illustrative and modified by a person having ordinary knowledge in the relevant technical field without departing from the spirit of the present invention. And may be changed.

100: monitoring system
110: measuring device
120: ventilation fan
130: gateway
140: monitoring server
150: manager terminal
160: user terminal
210: sensor module
220: network communication module
230: power module
240: control module
250: relay module
260: current sensor
270: light sensor

Claims (5)

A wireless communication device installed at a site including an enclosed space and transmitting environmental information of the enclosed space;
A ventilation fan disposed in the closed space to control air flow in the closed space, and receiving power through the wireless communication device;
A server receiving the environmental information of the enclosed space from the wireless communication module and generating monitoring information for the site based on the environmental information; And
And a manager terminal receiving and outputting the monitoring information,
The wireless communication device,
A sensor module for generating the environmental information by measuring a concentration of at least one of fine dust, carbon monoxide, carbon dioxide, and nitrogen oxide in the closed space;
A network communication module for transmitting the environment information to the server;
A power module converting first power supplied from an external power source into second power and supplying it to the sensor module and the network communication module;
A relay module connected between the external power source and the ventilation fan, and being turned on to transmit the first power to the ventilation fan, or being turned off to block transmission of the first power; And
And a control module for controlling an operation period of the sensor module and an operation period of the network communication module, and controlling an operation of the relay module in response to a control signal provided from the server.
The method of claim 1, wherein the network communication module comprises a wired communication terminal provided outside the wireless communication device,
The sensor module is attached to and attached to the wireless communication unit and is connected to the network communication module through the wired communication terminal.
The method of claim 2,
Further includes a gateway,
The network communication module of the wireless communication device generates a LORA (long range) packet based on the environment information and transmits the LORA packet using a LORA communication technology,
The gateway transmits the LoRa packet to the server.
The method of claim 3, wherein the wireless communication device further comprises a current sensor connected between the relay module and the ventilation fan to sense a current transmitted to the ventilation fan,
The control module generates state information of the ventilation fan based on the current,
The control module generates an alarm indicating a failure of the ventilation fan when the current is less than a reference current while the relay module is turned on.
The method of claim 4, wherein the wireless communication device further comprises an optical sensor for measuring the amount of light in the closed space,
The control module controls the operation of the sensor module and the network communication module based on the output of the optical sensor.

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