WO2021020052A1 - データ出力装置及びデータ収集システム - Google Patents

データ出力装置及びデータ収集システム Download PDF

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Publication number
WO2021020052A1
WO2021020052A1 PCT/JP2020/026638 JP2020026638W WO2021020052A1 WO 2021020052 A1 WO2021020052 A1 WO 2021020052A1 JP 2020026638 W JP2020026638 W JP 2020026638W WO 2021020052 A1 WO2021020052 A1 WO 2021020052A1
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Prior art keywords
data
wireless communication
data output
communication device
sensor
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Ceased
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PCT/JP2020/026638
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English (en)
French (fr)
Japanese (ja)
Inventor
康晴 大西
靖行 福田
佐枝 渡邉
昇 田代
柴田　道男
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NEC Corp
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NEC Corp
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Priority to US17/628,342 priority Critical patent/US20220415161A1/en
Priority to JP2021536874A priority patent/JPWO2021020052A1/ja
Publication of WO2021020052A1 publication Critical patent/WO2021020052A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/02—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division
    • G08C15/04—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division the signals being modulated on carrier frequencies
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path

Definitions

  • the present invention relates to a data output device and a data collection system.
  • Patent Document 1 discloses an environmental diagnostic system. It is described that this environmental diagnosis system is used in a plant cultivation space and wirelessly transmits the cultivation environment information detected by the sensor to the cultivation environment management device.
  • Patent Document 2 discloses that in a plant management system, information detected by a node device is wirelessly transmitted to a server.
  • Patent Document 3 a measuring instrument installed in a house covering a planting area and a transmitting device installed near the house are connected, and the transmitting device transmits the measured value of the measuring instrument to a terminal device. Has been described.
  • Patent Document 4 describes that a sensor is provided in a motor, a pump, or the like in a factory, the detected value of the sensor is preferentially transmitted to a voltage converter, and the voltage converter wirelessly transmits the sensor to an analyzer. There is.
  • the SN ratio of the data is lowered when the data reaches the wireless communication device.
  • An object of the present invention is to secure an SN ratio of data when it reaches the wireless communication device when the data generated by the sensor is transmitted to the outside using the wireless communication device.
  • At least one sensor that generates data and A relay device that receives the data via the first cable and processes the received data, and A wireless communication device that receives the data processed by the relay device from the relay device via the second cable, and A data output device comprising the above is provided.
  • a plurality of data output devices installed in different places and each of which outputs data wirelessly
  • a data storage device that stores the data output by the plurality of data generation devices
  • the data output device is provided with a data collection system which is the above-mentioned data output device.
  • the SN ratio of the data when it reaches the wireless communication device can be secured.
  • FIG. 1 is a diagram showing an example of the configuration of the data collection system 1 according to the present embodiment.
  • the data collection system 1 has a plurality of data output devices 10 and a data storage device 20.
  • the data output device 10 has a sensor (sensor 100 shown in FIG. 2), and data generated by this sensor is combined with an identifier for identifying the sensor from another sensor (hereinafter referred to as sensor identification information). Output to the storage device 20.
  • the plurality of data output devices 10 transmit data and sensor identification information to the data storage device 20 by performing multi-hop communication.
  • the data storage device 20 is, for example, a server, and stores the data and the sensor identification information transmitted from the data output device 10 in association with each other.
  • the plurality of data output devices 10 are installed on the same site (for example, on the site of a factory or on the site of a power plant). Then, the sensor included in the data output device 10 generates data indicating the state of the equipment located in the site.
  • equipment include, for example, transport equipment for transporting raw materials and semi-finished products, for example, conveyor belts, but other equipment, for example, blast furnaces, converters and rolling lines in steelworks, plants in chemical factories and various types of power generation It may be at least one of the equipment constituting the device.
  • the plurality of data output devices 10 may be installed in the same equipment as each other, or at least one data output device 10 may be installed in a facility different from the other data output devices 10.
  • wireless communication is performed between the plurality of data output devices 10, but communication using a cable may be performed between at least some of the data output devices 10. Further, the data output device 10 that directly communicates with the data storage device 20 may communicate with the data storage device 20 via a cable.
  • the band of wireless communication performed between the plurality of data output devices 10 and the band of wireless communication performed between the data output device 10 and the data storage device 20 may all be the same, or at least. One band may be different from the other.
  • the band of wireless communication performed in a place relatively close to the data storage device 20 may be on the higher frequency side than other bands.
  • the amount of data to be communicated increases. Therefore, if the above is performed, the communication speed can be secured.
  • the communication environment is likely to deteriorate. Therefore, as described above, there is a low possibility that communication will not be possible even at a place away from the data storage device 20.
  • the data output device 10 located at this boundary is different from the wireless band when receiving data and the wireless band when transmitting this data. ..
  • the radio band when receiving data is on the lower frequency side than the radio band when transmitting this data.
  • FIG. 2 is a diagram showing an example of the configuration of the data output device 10.
  • the data output device 10 includes at least one sensor 100, at least one relay device 200, a wireless communication device 300, at least one first cable 410, and at least one second cable 420.
  • the first cable 410 connects the sensor 100 and the relay device 200
  • the second cable 420 connects the relay device 200 and the wireless communication device 300.
  • the relay device 200 processes the data. That is, the relay device 200 receives data from the sensor 100 via the first cable 410 and processes the received data. Then, the wireless communication device 300 receives the data processed by the relay device 200 from the relay device 200 via the second cable 420.
  • the data output device 10 includes a plurality of sensors 100 and also includes a plurality of relay devices 200.
  • the plurality of relay devices 200 are connected to the wireless communication device 300 by second cables 420 that are different from each other. Further, a plurality of sensors 100 are connected to at least one relay device 200 by a first cable 410 different from each other.
  • the second cable 420 may have a power line.
  • the relay device 200 is supplied with power from the wireless communication device 300.
  • the first cable 410 may have a power line.
  • the sensor 100 is supplied with power from the relay device 200.
  • the plurality of sensors 100 are attached to the equipment 2 to be monitored.
  • the plurality of sensors 100 are installed at different monitoring points in the equipment 2.
  • the plurality of sensors 100 are sensors that detect the same physical quantity as each other.
  • the sensor 100 is a vibration sensor. This vibration sensor may detect vibration in one direction, or may detect vibration in multiple directions (for example, x-axis direction, y-axis direction, and z-axis direction) separately.
  • a plurality of sensors 100 for detecting physical quantities different from each other may be provided at one monitoring point.
  • a sensor 100 which is a vibration sensor and a sensor 100 which detects the rotation speed of the rollers constituting the belt conveyor may be provided at one monitoring place. Then, the sensor 100 may output data at predetermined intervals, for example, or may output data when instructed by the wireless communication device 300.
  • the equipment 2 that is, the sensor 100
  • the wireless communication device 300 may be separated from each other in order to protect the wireless communication device 300.
  • the total length of the first cable 410 and the second cable 420 is, for example, 30 m or more, and further 50 m or more.
  • the length of the first cable 410 is 10 m or more
  • the length of the second cable 420 is, for example, 20 m or more.
  • the first cable 410 may be shorter than the second cable 420.
  • the relay device 200 processes the data output by the sensor 100 and outputs it to the wireless communication device 300. That is, by providing the relay device 200, the sensor 100 and the wireless communication device 300 can be separated from each other.
  • the wireless communication device 300 or the relay device 200 controls the operation of the sensor 100 (for example, on / off of detection or data output).
  • the wireless communication device 300 controls the length of data output by the sensor 100 as one piece of data, that is, the length of measurement time. Thereby, the wireless communication device 300 can control the amount of data transmitted to the data storage device 20.
  • the relay device 200 outputs analog data or digital data. Then, the wireless communication device 300 performs AD conversion or DD conversion of the data received from the relay device 200. The wireless communication device 300 can control the amount of data transmitted to the data storage device 20 by changing the sampling frequency at the time of this conversion. The relay device 200 may perform this process instead of the wireless communication device 300.
  • the sensor 100 is a multi-axis vibration sensor as described above
  • the sensor 100, the relay device 200, or the wireless communication device 300 controls the number of vibration directions included in the data (for example, three axes).
  • the amount of data transmitted to the data storage device 20 can be controlled by including all of the above, or using two axes or one axis).
  • the wireless communication device 300 or the relay device 200 adjusts the number of sensors 100 to which data should be transmitted by adjusting the number of sensors 100.
  • the capacity of data transmitted to the data storage device 20 can be controlled.
  • the relay device 200 or the wireless communication device 300 may control the data capacity by discarding the data, or may control the data capacity by increasing or decreasing the number of operating sensors 100. Good.
  • the sensor 100 outputs the data generated by the sensor 100 together with the sensor identification information of the sensor 100.
  • the relay device 200 and the wireless communication device 300 output the data generated by the sensor 100 in association with the sensor identification information.
  • the relay device 200 may associate the sensor identification information with the data instead of the sensor 100.
  • FIG. 3 is a diagram showing an example of the functional configuration of the relay device 200.
  • the relay device 200 has a Fourier transform unit 210, a correction unit 220, and an inverse Fourier transform unit 230.
  • the Fourier transform unit 210 Fourier transforms the data received from the sensor 100.
  • the correction unit 220 corrects the intensity of the data after the Fourier transform for each frequency band.
  • the correction unit 220 is, for example, a digital filter, and performs the above-mentioned correction by, for example, multiplying by a correction coefficient for each band.
  • the inverse Fourier transform unit 230 performs an inverse Fourier transform on the data after the intensity has been corrected.
  • the relay device 200 may perform data amplification processing.
  • the relay device 200 further has a correction coefficient storage unit 222 and a correction meter week acquisition unit 224.
  • the correction coefficient storage unit 222 stores the correction coefficient used for the correction performed by the correction unit 220.
  • the correction meter week acquisition unit 224 acquires the correction coefficient input from the user and stores it in the correction coefficient storage unit 222. In other words, the user can update the correction coefficient stored in the correction coefficient storage unit 222.
  • the relay device 200 further has a data storage unit 232.
  • the data storage unit 232 stores the data received from the sensor 100.
  • the data storage unit 232 is provided to back up the data generated by the sensor 100. Therefore, even if an abnormality occurs in the wireless communication device 300 and the data cannot be transmitted to the data storage device 20 at a predetermined timing, the data can be acquired later from the data storage unit 232. This acquisition may be performed manually, or may be performed by transmitting the wireless communication device 300 to the data storage device 20 after the wireless communication device 300 is restored.
  • the data storage unit 232 stores the data after the inverse Fourier transform unit 230 performs the inverse Fourier transform, but the data before the Fourier transform unit 210 may store the data before the Fourier transform.
  • FIG. 4 is a diagram showing an example of the functional configuration of the wireless communication device 300.
  • the wireless communication device 300 has a data acquisition unit 310, a data storage unit 320, and a transmission unit 330.
  • the data acquisition unit 310 acquires data and sensor identification information from the relay device 200 and stores them in the data storage unit 320.
  • the data storage unit 320 may temporarily store the data or may store the data non-volatilely.
  • the transmission unit 330 transmits the data stored in the data storage unit 320 and the sensor identification information to the data storage device 20.
  • the transmission unit 330 may transmit the data and the sensor identification information to the data storage device 20 (real-time processing) immediately after the data acquisition unit 310 receives the data and the sensor identification information, in a batch manner. Data and sensor identification information may be transmitted to the data storage device 20.
  • the transmission unit 330 transmits data and sensor identification information from the wireless communication device 300 to another wireless communication device 300 closer to the data storage device 20.
  • the transmission unit 330 receives data from the other wireless communication device 300, the transmission unit 330 also transmits the data to the other wireless communication device 300 closer to the data storage device 20 than the wireless communication device 300.
  • the transmission unit 330 transmits dummy data when determining the transmission destination wireless communication device 300. The details of this process will be described later using a flowchart.
  • the wireless communication device 300 further has a priority information storage unit 332 and a dummy data storage unit 334.
  • the priority information storage unit 332 and the dummy data storage unit 334 store the data used for the above-mentioned multi-hop.
  • the dummy data storage unit 334 stores the above-mentioned dummy data, that is, data used when determining the transmission destination wireless communication device 300.
  • the priority information storage unit 332 stores information for determining the wireless communication device 300 as the data transmission destination. The details of the information stored in the priority information storage unit 332 will be described later with reference to FIG.
  • the data acquisition unit 310 or the transmission unit 330 may generate dummy data from the data stored in the data storage unit 320 and store it in the dummy data storage unit 334. Further, the wireless communication device 300 does not have to have the dummy data storage unit 334. In this case, the transmission unit 330 may generate dummy data from the data stored in the data storage unit 320, for example, or may use the data stored in the data storage unit 320 as the dummy data.
  • FIG. 5 is a diagram showing an example of the data structure of the priority information storage unit 332.
  • the priority information storage unit 332 stores information for connecting to another wireless communication device 300 that can be a data transmission destination of the wireless communication device 300.
  • the priority information storage unit 332 has information (hereinafter, connection information) required for connecting to the wireless communication device 300 for each of a plurality of other wireless communication devices 300 that can be data transmission destinations. (Description) and information indicating the priority of the wireless communication device 300 (hereinafter referred to as priority information) are stored.
  • the number of connection information stored in the priority information storage unit 332 (that is, the number of other wireless communication devices 300 that can be data transmission destinations) is from "the number of data output devices 10 constituting the data collection system 1-1". There are few.
  • the priority information storage unit 332 also stores the device identification information (device ID) for identifying the wireless communication devices 300 from each other. However, the priority information storage unit 332 does not have to store the device identification information.
  • FIG. 6 is a block diagram illustrating a hardware configuration of the wireless communication device 300.
  • the wireless communication device 300 includes a bus 1010, a processor 1020, a memory 1030, a storage device 1040, an input / output interface 1050, and a network interface 1060.
  • the bus 1010 is a data transmission path for the processor 1020, the memory 1030, the storage device 1040, the input / output interface 1050, and the network interface 1060 to transmit and receive data to and from each other.
  • the method of connecting the processors 1020 and the like to each other is not limited to the bus connection.
  • the processor 1020 is a processor realized by a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or the like.
  • the memory 1030 is a main storage device realized by a RAM (Random Access Memory) or the like.
  • the storage device 1040 is an auxiliary storage device realized by an HDD (Hard Disk Drive), an SSD (Solid State Drive), a memory card, a ROM (Read Only Memory), or the like.
  • the storage device 1040 stores a program module that realizes each function of the wireless communication device 300 (for example, a data acquisition unit 310 and a transmission unit 330).
  • a program module that realizes each function of the wireless communication device 300 (for example, a data acquisition unit 310 and a transmission unit 330).
  • the storage device 1040 also functions as a data storage unit 320, a priority information storage unit 332, and a dummy data storage unit 334.
  • the input / output interface 1050 is an interface for connecting the wireless communication device 300 and various input / output devices.
  • the network interface 1060 is an interface for connecting the wireless communication device 300 to a network or another device (for example, a relay device 200 or another wireless communication device 300).
  • This network is, for example, LAN (Local Area Network) or WAN (Wide Area Network).
  • the way the network interface 1060 connects to a network or other device is a wireless connection and a wired connection.
  • FIG. 7 is a flowchart showing an example of processing when the wireless communication device 300 transmits data to the wireless communication device 300 which is closer to the data storage device 20 than the wireless communication device 300.
  • the data transmitted here is at least one of the data generated by the sensor 100 and the data received from the other wireless communication device 300. Then, the wireless communication device 300 transmits the data to be transmitted to the other wireless communication device 300 as follows.
  • the transmission unit 330 of the wireless communication device 300 reads the dummy data from the dummy data storage unit 334 (step S102).
  • the transmission unit 330 reads the connection information of the other wireless communication device 300 having the highest priority from the priority information storage unit 332.
  • the wireless communication device 300 temporarily sets the transmission destination (step S104).
  • the wireless communication device 300 transmits dummy data using the connection information read in step S104 (step S106).
  • the transmission unit 330 of the wireless communication device 300 as the transmission destination receives the dummy data
  • the transmission unit 330 directs the information indicating that the reception is completed (hereinafter referred to as the first reception completion information) to the transmission unit 330 of the transmission source. Send.
  • step S108 when the transmission unit 330 receives the first reception completion information within the specified time after transmitting the dummy data (step S108: Yes), the temporarily set destination is set as the official destination. Then, the transmission unit 330 transmits the data to be transmitted by using the connection information read in step S104 (step S110).
  • step S108 when the transmission unit 330 does not receive the first reception completion information within the specified time after transmitting the dummy data (step S108: No), the transmission unit 330 reads out the connection information having the next highest priority (step S104). ), The processing shown in steps S106 and S108 is repeated. That is, the transmission unit 330 reads the connection information and repeats the process of communicating using the read connection information in descending order of priority until the communication is successful. In this way, the data transmission route is set.
  • the priority information storage unit 332 of the wireless communication device 300 stores connection information for connecting to another wireless communication device 300 that can be a data transmission destination of the wireless communication device 300. Then, the transmission unit 330 reads the connection information and repeats the process of communicating using the read connection information in descending order of priority until the communication is successful. That is, the transmission unit 330 does not broadcast. Therefore, when the data collection system 1 is used, when data is collected by multi-hop, the data can be collected even if a failure occurs, and the amount of communication at the time of data collection can be reduced.
  • the wireless communication device 300 uses dummy data when determining the wireless communication device 300 as the transmission destination. Then, the data to be transmitted (for example, the data generated by the sensor 100 or the data received from another wireless communication device 300) is transmitted to the wireless communication device 300 that has been able to transmit the dummy data. Therefore, the data to be transmitted can be transmitted to the data storage device 20 with a high probability.
  • a relay device 200 is provided between the sensor 100 and the wireless communication device 300.
  • the relay device 200 processes the data output by the sensor 100 and then outputs the data to the wireless communication device 300. Therefore, even if the sensor 100 and the wireless communication device 300 are separated from each other, it is possible to suppress a decrease in the SN ratio of the data when the wireless communication device 300 is reached.
  • the data collection system 1 according to the present embodiment has the same configuration as the data collection system 1 according to the first embodiment except for the following points.
  • the transmission unit 330 changes the wireless communication device 300 as a transmission destination according to the amount of data to be transmitted. For this purpose, the transmission unit 330 uses dummy data according to the amount of data to be transmitted. That is, the transmission unit 330 determines the transmission route corresponding to the first capacity by using the transmission result of the first dummy data having the first capacity, and transmits the second dummy data having the second capacity. The result is used to determine the transmission route corresponding to the second capacity.
  • the dummy data storage unit 334 of the wireless communication device 300 stores a plurality of dummy data having different capacities in association with the range of the data capacity in which the dummy data should be used.
  • FIG. 8 is a flowchart showing an operation example of the transmission unit 330 in the present embodiment.
  • the transmission unit 330 confirms the amount of data to be transmitted.
  • the dummy data corresponding to the confirmed capacity is read out from the dummy data storage unit 334 (step S103).
  • Subsequent processing (steps S104 to S110) is as described with reference to FIG.
  • the transmission unit 330 of the wireless communication device 300 uses dummy data according to the amount of data to be transmitted. Therefore, the data collection system 1 can set a transmission route according to the amount of data to be transmitted.
  • the data capacity is adjusted according to the time from when the data output device 10 outputs the data until the data reaches the data storage device 20. It has the same configuration as the data output device 10 according to the first embodiment.
  • the data storage device 20 when the data storage device 20 receives the data, the data storage device 20 directs the information indicating that the data has been received (hereinafter referred to as the second reception completion information) to the data output device 10 from which the data was generated. And send.
  • the second reception completion information may include the date and time when the data storage device 20 receives the data (hereinafter, referred to as the reception time).
  • This transmission may be performed in a multi-hop manner, or may be performed in a form of reversing the route to which the data is transmitted.
  • the transmission unit 330 of the wireless communication device 300 transmits the data to be transmitted in association with the information that identifies the transmission unit 330 (hereinafter, referred to as route identification information). Then, the second reception completion information is transmitted by using the route identification information associated with the transmitted data.
  • FIG. 9 is a flowchart showing an operation example of the transmission unit 330 in the present embodiment.
  • the processes shown in steps S102 to S108 are as described in FIG.
  • the process shown in step S103 of FIG. 8 may be performed.
  • the data storage device 20 When the data storage device 20 receives the data, the data storage device 20 transmits the second reception completion information to the data output device 10 in which the data is generated. Then, the transmission unit 330 measures the time from the transmission of the data to the reception of the second reception completion information.
  • the wireless communication device 300 may calculate the time from the transmission of the data to the reception time (step S112). Then, the transmission unit 330 adjusts the amount of data when the data is transmitted next according to this time (step S114). For example, the transmission unit 330 gradually reduces the amount of data as the time measured in step S112 becomes crying.
  • the transmission unit 330 can also adjust the data capacity by adjusting the number of axial directions included in the data.
  • the transmission unit 330 then transmits the data according to the time from the transmission of the data to the reception of the reply (second reception completion information) from the data output device 10. Adjust the amount of data when you do. Therefore, it is possible to prevent the time required for the data to reach the data storage device 20 to become longer than necessary.
  • FIG. 10 is a diagram showing a functional configuration of the relay device 200 of the data collection system 1 according to the present embodiment.
  • the data collection system 1 according to the present embodiment is the same as the data collection system 1 according to any one of the above-described embodiments, except that the relay device 200 has the battery 240 and the terminal 242.
  • the battery 240 supplies electric power to other parts of the relay device 200, and also supplies electric power to the outside via the terminal 242.
  • the terminal 242 supplies power to the sensor 100 via the power line included in the first cable 410.
  • the relay device 200 when the relay device 200 is supplied with electric power from the outside, it is conceivable that a part of the electric power is supplied to the sensor 100 via the power line included in the first cable 410. If the power supply from the outside is cut off, the sensor 100 will not be able to generate data.
  • the battery 240 when the supply of electric power to the relay device 200 is interrupted, the battery 240 supplies data to other parts of the relay device 200 and the sensor 100. Therefore, the sensor 100 can generate data, and the data generated by the sensor 100 can be stored in the data storage unit 232.
  • Some or all of the above embodiments may also be described, but not limited to: 1. 1. With at least one sensor that produces data, A relay device that receives the data via the first cable and processes the received data, and A wireless communication device that receives the data processed by the relay device from the relay device via the second cable, and A data output device comprising. 2. 2. In the data output device described in 1 above, The relay device is a data output device that Fourier transforms the data, performs intensity correction processing for each frequency band, and then performs inverse Fourier transform. 3. 3. In the data output device according to 1 or 2 above, The second cable is a data output device that is longer than the first cable. 4. In the data output device according to any one of 1 to 3 above.
  • the relay device Batteries and A power terminal that outputs power from the battery to the outside, Have and The first cable is a data output device having a power line that connects the power terminal to the sensor. 6.
  • the relay device is a data output device having a storage unit for storing the data. 7. Multiple data output devices that are installed in different locations and each output data wirelessly, A data storage device that stores the data output by the plurality of data generation devices, and With The data output device is a data collection system that is the data output device according to any one of 1 to 6 above.

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PCT/JP2020/026638 2019-07-30 2020-07-08 データ出力装置及びデータ収集システム Ceased WO2021020052A1 (ja)

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