JP2019186753A - Sensor network system - Google Patents

Abstract

To enhance replacement workability for a sensor terminal.SOLUTION: A sensor network system 10 includes: a storage unit 112 in which terminal position information where identification information of a sensor terminal 100 and information on the installation position of the sensor terminal 100 are associated with each other is stored in advance; a generation unit 111a for generating connection state information of a mesh network including route information on the plurality of sensor terminals 100; a position identifying unit 111b for identifying the installation position of a predetermined sensor terminal 100 when a communication path including a predetermined sensor terminal 100 is lost on the basis of the connection state information of the mesh network after the loss, and an update unit 111c, when a communication path including a new sensor terminal 100 appears, for associating the identification information of the new sensor terminal 100 and information of the installation position identified by the position identifying unit 111b with each other and updating the terminal position information stored in the storage unit 112 on the basis of the connection state information of the mesh network after the appearance.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sensor network system.

  There is known a meter reading network that includes a gateway radio and a plurality of meter radios connected to the meter, and transmits the meter reading value to the gateway radio directly or via another meter radio ( Patent Document 1). In the meter reading network, the management device can collectively read the meter by receiving a plurality of meter reading values from the gateway radio.

JP 2018-26764 A

  Conventionally, when a sensor terminal is replaced in a sensor network system having a plurality of sensor terminals, it is necessary to re-register information that associates the identification information of the new sensor terminal with the information on the mounting position of the sensor terminal, There is a problem that it takes time to replace the sensor terminal.

  The present invention has been made in view of the above problems, and an object thereof is to improve the workability of exchanging sensor terminals.

  1st invention is a sensor network system, Comprising: The memory | storage part by which the terminal position information with which the identification information of the sensor terminal and the information on the attachment position of the sensor terminal were linked | related was previously memorize | stored, and the routing information regarding several sensor terminals When a communication path including a predetermined sensor terminal from the mesh network disappears, based on the mesh network connection state information generated by the generation unit after the disappearance, Based on the mesh network connection state information generated by the generation unit after the appearance when a communication path including a new sensor terminal appears in the mesh network with a position specifying unit that specifies the attachment position of the predetermined sensor terminal, The new sensor terminal identification information is related to the mounting position information specified by the position specifying unit. Only includes an update unit for updating the terminal location information stored in the storage unit.

  In 1st invention, when the sensor terminal of a predetermined attachment position is replaced | exchanged, terminal position information is automatically updated based on the connection state of the mesh network containing a new sensor terminal.

  According to a second aspect of the present invention, when a communication path including a predetermined sensor terminal disappears from the mesh network, the position specifying unit compares the mesh network connection state information generated by the generating unit before and after the disappearance, thereby The sensor terminal is specified, and the attachment position of the predetermined sensor terminal is specified based on the terminal position information.

  In the second invention, the attachment position of the predetermined sensor terminal can be specified by the change in the connection state information of the mesh network.

  According to a third aspect of the present invention, when the communication unit including the predetermined sensor terminal disappears from the mesh network, the position specifying unit identifies the sensor terminal identification information included in the mesh network connection state information generated by the generation unit after the disappearance. And the identification information of the sensor terminal included in the terminal position information stored in the storage unit to identify the predetermined sensor terminal, and specify the mounting position of the predetermined sensor terminal based on the terminal position information To do.

  In 3rd invention, the attachment position of the sensor terminal which became unable to communicate can be specified with terminal position information and the connection status information of the present mesh network.

  According to a fourth aspect of the present invention, when a communication path including a new sensor terminal appears in the mesh network, the update unit compares the mesh network connection state information generated by the generation unit before and after the appearance, thereby creating a new The sensor terminal is specified, the identification information of the new sensor terminal is associated with the mounting position information specified by the position specifying unit, and the terminal position information stored in the storage unit is updated.

  In the fourth aspect of the invention, a new sensor terminal mounting position can be automatically set by changing the mesh network connection state information.

  According to a fifth aspect of the present invention, when a communication path including a new sensor terminal appears in the mesh network, the update unit includes sensor terminal identification information included in the mesh network connection status information generated by the generation unit after the appearance. The new sensor terminal is identified by comparing the sensor terminal identification information included in the terminal position information stored in the storage unit, and the new sensor terminal identification information and the position identification unit are identified. The terminal position information stored in the storage unit is updated by associating with the position information.

  In the fifth invention, the attachment position of a new sensor terminal can be automatically set based on the terminal position information and the current mesh network connection state information.

  According to a sixth aspect of the invention, the mesh network connection state information includes information on the radio field strength between the plurality of sensor terminals and the radio field strength between the plurality of sensor terminals and the gateway terminal. When a communication path including two or more sensor terminals disappears from the network, the attachment position of the two or more sensor terminals is specified based on the connection state information of the mesh network before and after the disappearance, and the update unit When a communication path including a sensor terminal appears, the identification information of the new sensor terminal and the mounting position information specified by the position specifying unit based on the mesh network connection state information including information on the radio wave intensity before and after the appearance. And the terminal position information stored in the storage unit is updated.

  In the sixth invention, in the replacement work after two or more sensor terminals become incapable of communication, the worker re-registers the new sensor terminal identification information and its mounting position information by manual input or the like. Can be eliminated and the replacement workability can be improved.

  In the seventh invention, the gateway terminal includes a storage unit, a generation unit, a position specifying unit, and an update unit.

  In the seventh invention, the gateway terminal specifies the mounting position of the predetermined sensor terminal that has become unable to communicate, associates the new sensor terminal identification information with the specified mounting position information, and updates the terminal position information Since the automatic update process is performed, the processing load on the sensor terminal can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the exchange workability | operativity of a sensor terminal can be improved.

FIG. 1 is a schematic diagram of a hydraulic excavator to which a sensor network system according to a first embodiment of the present invention is applied. FIG. 2 is a block diagram showing the configuration of the sensor network system according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating a terminal position table stored in the storage unit. FIG. 4 is a diagram showing a change in connection state information of the mesh network in the sensor network system according to the first embodiment of the present invention. FIG. 4A is a diagram schematically showing the first connection status information I1 of the mesh network, and FIG. 4B is a diagram schematically showing the second connection status information I2 of the mesh network. FIG. 4C is a diagram schematically showing the third connection state information I3 of the mesh network. FIG. 5 is a diagram illustrating an example of the routing table of the first sensor terminal included in the first connection state information I1 of the mesh network. FIG. 6 is a diagram illustrating an example of the routing table of the first sensor terminal included in the second connection state information I2 of the mesh network. FIG. 7 is a diagram illustrating an example of the routing table of the first sensor terminal included in the third connection state information I3 of the mesh network. FIG. 8 is a diagram illustrating a terminal position table stored in the storage unit after a communication path including a new sensor terminal appears. FIG. 9 is a flowchart showing an example of an automatic update process of information on a new sensor terminal attachment position by an automatic update program executed by the gateway terminal according to the first embodiment of the present invention. FIG. 10 is a diagram showing an example of a radio wave intensity table stored in the storage unit of the gateway terminal according to the second embodiment of the present invention. FIG. 11 is a diagram showing a change in connection state information of the mesh network in the sensor network system according to the second embodiment of the present invention. FIG. 11A is a diagram schematically showing the first connection state information I1 of the mesh network. FIG. 11B is a diagram schematically showing second connection state information I2 of the mesh network. FIG. 11C is a diagram schematically showing the third connection state information I3 of the mesh network.

<First Embodiment>
With reference to FIGS. 1-9, the sensor network system 10 which concerns on 1st Embodiment of this invention is demonstrated. First, a hydraulic excavator 1 as a working machine to which a sensor network system 10 according to a first embodiment of the present invention is applied will be described with reference to FIG.

  The hydraulic excavator 1 includes a crawler-type traveling unit 2, a swivel unit 3 that can be pivoted on an upper portion of the traveling unit 2, and an excavation unit 5 that is disposed at the front center of the swivel unit 3. The swivel unit 3 is provided with a cabin 3a on which an operator rides.

  The traveling unit 2 causes the hydraulic excavator 1 to travel by driving a pair of left and right crawlers 2a by a traveling motor (not shown). The turning unit 3 is driven by a turning motor (not shown) and turns in the left-right direction with respect to the traveling unit 2.

  The excavation part 5 is swingable around a horizontal axis extending in the left-right direction of the revolving part 3, an arm 7 swingably attached to the tip of the boom 6, and swingable at the tip of the arm 7. And a bucket 8 for excavating earth and sand.

  In addition, the excavation unit 5 includes a boom cylinder 11 that rotates the boom 6 up and down, an arm cylinder 12 that rotates the arm 7 up and down, and a bucket cylinder 13 that rotates the bucket 8. As described above, the excavator 1 includes a plurality of hydraulic cylinders such as the boom cylinder 11, the arm cylinder 12, and the bucket cylinder 13.

  The sensor network system 10 of the hydraulic excavator 1 will be described. As shown in FIG. 1, the sensor network system 10 is a sensor network system 10 including a mesh network including a gateway terminal 110 attached in the cabin 3a and a plurality of sensor terminals 100 attached to each hydraulic cylinder. . The sensor network system 10 is a mesh type multi-hop network system having a gateway terminal 110 and a plurality of sensor terminals 100 as communication nodes.

  As shown in FIG. 2, in this embodiment, an example in which the sensor network system 10 includes four sensor terminals 100 (101, 102, 103, 104) and a gateway terminal 110 will be described. The number of sensor terminals 100 may be two, three, or five or more. Each communication node performs wireless communication according to the same communication standard. As a communication standard, for example, various communication standards such as ZigBee (registered trademark), Dust Networks (registered trademark), and Bluetooth Mesh (Bluetooth is a registered trademark) can be adopted.

  As shown in FIG. 2, the gateway terminal 110, the first sensor terminal 101, and the second sensor terminal 102 are arranged so as to be capable of wireless communication with each other. The 1st sensor terminal 101, the 2nd sensor terminal 102, the 3rd sensor terminal 103, and the 4th sensor terminal 104 are arrange | positioned so that wireless communication is mutually possible.

  The gateway terminal 110 is connected to a controller 120 mounted in the cabin 3a, and can exchange information with the controller 120. The controller 120 is a control device that controls each part of the excavator 1. The gateway terminal 110 outputs information obtained by processing the detection information from each sensor terminal 100 to the controller 120 by wire or wirelessly.

  The gateway terminal 110, each sensor terminal 100, and the controller 120 include a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface (I / O interface), etc. It consists of a microcomputer with peripheral circuits. As the operation circuit, an MPU (Micro Processing Unit), a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or the like can be used instead of or together with the CPU. .

  The plurality of sensor terminals 100 (101, 102, 103, 104) have the same configuration. The sensor terminal 100 transmits the detection information detected by the detection unit 132 to the gateway terminal 110. The sensor terminal 100 includes a control unit 131 that controls each unit of the sensor terminal 100, a detection unit 132 that detects the pressure of hydraulic fluid that has leaked from the hydraulic cylinder, and a communication that transmits detection information detected by the detection unit 132. Unit 134, storage unit 133 that stores the detection information and its own routing table, and reception intensity detection unit 136 that detects radio wave reception intensity from other communication nodes (sensor terminal 100 and gateway terminal 110) other than itself. .

  The communication unit 134 includes a modem and an antenna for performing wireless communication with other communication nodes (sensor terminal 100 and gateway terminal 110) other than itself capable of wireless communication, and is controlled by the control unit 131. Is done. The communication unit 134 receives detection information detected by another sensor terminal 100 and transmits the detection information to the gateway terminal 110 or another sensor terminal 100. That is, the sensor terminal 100 also functions as a repeater.

  The gateway terminal 110 includes a control unit 111 that controls each unit of the gateway terminal 110, a storage unit 112 that stores various types of information, a communication unit 113 that receives information from each sensor terminal 100, and a sensor terminal capable of wireless communication. A reception intensity detection unit 114 that detects the radio wave reception intensity from 100.

  The communication unit 113 includes a modem and an antenna for performing wireless communication with the sensor terminal 100 capable of wireless communication, and is controlled by the control unit 111.

  In the sensor network system 10, the plurality of sensor terminals 100 select a communication path with a good radio wave state based on information on the radio wave reception intensity between the communication nodes, and transmit detection information to the gateway terminal 110 through the selected communication path. . That is, the sensor terminal 100 transmits detection information detected by itself to the gateway terminal 110 directly or indirectly to the gateway terminal 110 via one or more other sensor terminals 100.

  Connected to the gateway terminal 110 are an input device 121 to which a signal from a storage medium such as a memory card or a signal from an operation device such as a mouse, keyboard, or touch panel is input, and a display device 122 such as a liquid crystal panel. The gateway terminal 110 displays a predetermined display image on the display screen of the display device 122 based on the input signal from the input device 121. Further, the gateway terminal 110 determines whether leakage of hydraulic oil in the hydraulic cylinder has occurred based on the detection information detected by each sensor terminal 100, and outputs the determination result to the controller 120. When it is determined that the hydraulic cylinder has leaked hydraulic fluid, the gateway terminal 110 indicates that the oil leak has occurred on the display screen of the display device 122 and that the hydraulic cylinder has leaked. Display information. Note that the controller 120 may perform the process of determining whether or not an oil leak has occurred. In this case, the controller 120 determines whether leakage of hydraulic oil in the hydraulic cylinder has occurred based on the detection information detected by each sensor terminal 100 acquired via the gateway terminal 110, and Information corresponding to the determination result is displayed on a connected display device (not shown).

  Each sensor terminal 100 includes a battery 135, and performs a detection operation and a communication operation using electric power supplied from the battery 135. If the remaining battery level decreases due to continued use of each sensor terminal 100, each sensor terminal 100 needs to be replaced. Conventionally, an operator removes an old sensor terminal 100 and attaches a new sensor terminal 100, and then re-registers information that associates the identification information of the new sensor terminal 100 with the information on the attachment position of the sensor terminal 100. Work was necessary. This operation has been performed manually using the input device 121 or the like. For this reason, the input operation takes time and there is a possibility that incorrect information is registered due to an erroneous input.

  Therefore, in the sensor network system 10 according to the present embodiment, when the sensor terminal 100 at a predetermined attachment position is removed and a new sensor terminal 100 is attached, the identification information of the new sensor terminal 100 and the attachment position of the sensor terminal 100 are attached. Information is automatically associated and stored. This eliminates the need for manual input as described above and improves the replacement workability. This will be specifically described below.

  As illustrated in FIG. 3, the storage unit 112 of the gateway terminal 110 stores in advance a terminal position table that is terminal position information in which identification information of each sensor terminal 100 and information on an attachment position of each sensor terminal 100 are associated. Has been. This terminal location table is registered by using the input device 121 or the like at the time of product shipment. Thereby, the storage unit 112 of the gateway terminal 110 stores the identification information of the sensor terminal 100 attached at the time of product shipment and the information on the attachment position in association with each other. Note that the terminal location table may be registered using an input device (not shown) connected to the controller 120 without using the input device 121 connected to the gateway terminal 100. In this case, terminal position information in which identification information and attachment position information are associated with each other is input to the gateway terminal 110 via the controller 120.

  The storage unit 112 stores an address (node ID) A1 that is identification information of the first sensor terminal 101 and information Pa of the attachment position of the first sensor terminal 101 in association with each other. The storage unit 112 stores an address (node ID) A2 that is identification information of the second sensor terminal 102 and information Pb of the attachment position of the second sensor terminal 102 in association with each other. The storage unit 112 stores an address (node ID) A3, which is identification information of the third sensor terminal 103, and information Pc of the attachment position of the third sensor terminal 103 in association with each other. The storage unit 112 stores an address (node ID) A4, which is identification information of the fourth sensor terminal 104, and information Pd of the attachment position of the fourth sensor terminal 104 in association with each other.

  As shown in FIG. 2, the control unit 111 generates a mesh network connection state information including path information regarding the plurality of sensor terminals 100, and a communication path including the predetermined sensor terminal 100 disappears from the mesh network. The location specifying unit 111b for specifying the attachment position of the lost sensor terminal 100, and the update unit 111c for updating the terminal location table when a communication path including the new sensor terminal 100 appears in the mesh network, Have

  The generation unit 111a repeatedly generates mesh network connection state information at a predetermined control cycle, and stores the information in the storage unit 112. That is, the mesh network connection state information stored in the storage unit 112 is updated at a predetermined control cycle. Note that the storage unit 112 stores mesh network connection state information generated before a predetermined control period (for example, one control period before) in the storage unit 112 as a previous value. The mesh network connection state information is generated by each sensor terminal 100 and gateway terminal 110 exchanging each other's routing tables.

  As shown in FIG. 4A, when all of the sensor terminals 100 (101, 102, 103, 104) and the gateway terminal 110 are normally performing wireless communication, a communication path including each of the sensor terminals 100. A mesh network is constructed. At this time, the first connection state information I1 of the mesh network generated by the generation unit 111a and stored in the storage unit 112 includes route information regarding each of the sensor terminals 100.

  FIG. 5 is a diagram illustrating an example of the routing table of the first sensor terminal 101 included in the first connection state information I1. In the routing table of the first sensor terminal 101, the destination node address (node ID), the number of hops to the destination node, the address of the communication node (relay node) (node ID) as the relay, It is stored in association with the address A1 of the first sensor terminal 101 which is the transmission source node. Although not shown, similarly, the routing table of the second sensor terminal 102, the third sensor terminal 103, and the fourth sensor terminal 104 is stored in the first connection state information I1.

  When the battery 135 runs out, breaks down, or is powered off, the sensor terminal 100 becomes in a state where communication with other communication nodes (other sensor terminals 100 and gateway terminals 110) is impossible. When a predetermined sensor terminal 100 becomes incapable of communication among the first sensor terminal 101 to the fourth sensor terminal 104, as shown in FIG. 4B, a communication path including the sensor terminal 100 that has become incapable of communication is present. Disappear from the mesh network. In other words, a mesh network is constructed by communication paths including other sensor terminals 100 excluding the sensor terminal 100 that has become unable to communicate. At this time, the second connection state information I2 of the mesh network generated by the generation unit 111a and stored in the storage unit 112 does not include route information regarding the sensor terminal 100 that has become unable to communicate.

  For example, when the third sensor terminal 103 becomes unable to communicate, the communication path including the third sensor terminal 103 disappears from the mesh network. An example of a communication path including the lost third sensor terminal 103 is shown below using the address of each communication node.

The detection information detected by the first sensor terminal (A1) 101 that is the transmission source is a communication route to the gateway terminal (GW) 110 that is the destination, and the communication route including the third sensor terminal 103 is as follows. It is as follows.
(Number of hops: 3) A1 → A3 → A2 → GW
(Hop number: 4) A1 → A3 → A4 → A2 → GW, A1 → A4 → A3 → A2 → GW

The detection information detected by the second sensor terminal (A2) 102 that is the transmission source is a communication route to the gateway terminal (GW) 110 that is the destination, and the communication route including the third sensor terminal 103 is as follows. It is as follows.
(Number of hops: 3) A2 → A3 → A1 → GW
(Hops: 4) A2 → A3 → A4 → A1 → GW, A2 → A4 → A3 → A1 → GW

The detection information detected by the third sensor terminal (A3) 103 that is the transmission source is a communication path to the gateway terminal (GW) 110 that is the destination, and the communication path including the third sensor terminal 103 is as follows. It is as follows.
(Number of hops: 2) A3 → A1 → GW, A3 → A2 → GW
(Number of hops: 3) A3 → A4 → A1 → GW, A3 → A4 → A2 → GW, A3 → A1 → A2 → GW, A3 → A2 → A1 → GW
(Hop number 4) A3 → A4 → A1 → A2 → GW, A3 → A4 → A2 → A1 → GW

The detection information detected by the fourth sensor terminal (A4) 104 as the transmission source is a communication route to the gateway terminal (GW) 110 as the destination, and the communication route including the third sensor terminal 103 is as follows. It is as follows.
(Number of hops: 3) A4 → A3 → A1 → GW, A4 → A3 → A2 → GW
(Number of hops: 4) A4 → A3 → A1 → A2 → GW, A4 → A3 → A2 → A1 → GW, A4 → A2 → A3 → A1 → GW, A4 → A1 → A3 → A2 → GW

  After the communication path including these third sensor terminals 103 disappears, the second connection state information I2 of the mesh network generated by the generation unit 111a does not include path information regarding the third sensor terminal 103. In other words, when the communication path including the third sensor terminal 103 disappears, the path information regarding the third sensor terminal 103 disappears from the connection state information of the mesh network.

  For example, as shown in FIG. 6, the routing table of the first sensor terminal 101 included in the second connection state information I2 is information (from the routing table of the first sensor terminal 101 included in the first connection state information I1). 4), (6), (7), (9) to (14), and (17) to (19) are deleted.

  In other words, among the first connection state information I1 of the mesh network, the route information related to the third sensor terminal 103 (that is, the information (10) to (14) with the target node as the third sensor terminal (A3) 103 and the relay node All of the information (6), (7), (18), (19)) with the third sensor terminal (A3) 103 disappearing. Similarly, the route information regarding the third sensor terminal 103 also disappears from the routing table of the second sensor terminal 102 included in the first connection state information I1 of the mesh network. Further, the route information related to the third sensor terminal 103 also disappears from the routing table of the fourth sensor terminal 104 included in the first connection state information I1 of the mesh network. In the routing table of the third sensor terminal 103 included in the first connection state information I1 of the mesh network, all pieces of information in which the transmission source node is the third sensor terminal (A3) are route information regarding the third sensor terminal 103. So all information is lost.

  Thereafter, a new sensor terminal 100 is attached in place of the sensor terminal 100 that has become unable to communicate, and when the new sensor terminal 100 starts communication, the new sensor terminal 100 is included as shown in FIG. A communication path appears in the mesh network. In other words, a mesh network is constructed by a communication path including the new sensor terminal 100 and the existing sensor terminal 100. At this time, the third connection state information I3 of the mesh network generated by the generation unit 111a and stored in the storage unit 112 includes route information regarding the new sensor terminal 100.

  For example, when a fifth sensor terminal 105 having an address (node ID) A5 as identification information starts communication as a new sensor terminal 100, a communication path including the fifth sensor terminal 105 appears in the mesh network. That is, the gateway terminal 110, the 1st sensor terminal 101, the 2nd sensor terminal 102, the 4th sensor terminal 104, and the 5th sensor terminal 105 perform wireless communication, and a mesh network is constructed | assembled.

  After the communication path including the fifth sensor terminal 105 appears, the third connection state information I3 of the mesh network generated by the generation unit 111a includes path information regarding the fifth sensor terminal 105 that is the new sensor terminal 100. included. In other words, when a communication path including the fifth sensor terminal 105 appears, path information regarding the fifth sensor terminal 105 corresponding to the communication path including the fifth sensor terminal 105 appears in the connection state information of the mesh network.

  For example, as shown in FIG. 7, the routing table of the first sensor terminal 101 included in the third connection state information I3 is the routing of the first sensor terminal 101 included in the second connection state information I2 shown in FIG. Information (4), (6), (7), (9) to (14), (17) to (19) shown in FIG. 7 is added to the table.

  That is, the third connection state information I3 of the mesh network includes route information regarding the fifth sensor terminal 105 (that is, information (10) to (14) in which the target node is the fifth sensor terminal (A5) 105) and the relay node. Information (6), (7), (18), (19)) is included as a fifth sensor terminal (A5) 105. Similarly, the routing table of the second sensor terminal 102 included in the third connection state information I3 of the mesh network includes route information regarding the fifth sensor terminal 105. Further, the routing table of the fourth sensor terminal 104 included in the third connection state information I3 of the mesh network includes route information regarding the fifth sensor terminal 105. In the routing table of the fifth sensor terminal 105 included in the third connection state information I3 of the mesh network, all the information in which the transmission source node is the fifth sensor terminal (A5) 105 is route information regarding the fifth sensor terminal 105. is there.

  As described above, when the sensor terminal 100 becomes incapable of communication or when a new sensor terminal 100 starts communication, the mesh network connection state information changes. The control unit 111 according to the present embodiment causes the storage unit 112 to store, as the specific attachment position P, the information on the attachment position of the sensor terminal 100 in which all the route information has been lost based on the change in the mesh network connection state information. Thereafter, the control unit 111 associates the identification information of the newly appearing sensor terminal 100 with the specific attachment position P stored in the storage unit 112 and causes the storage unit 112 to store the identification information.

  As shown in FIG. 2, when the communication path including the predetermined sensor terminal 100 disappears from the mesh network (see FIG. 4B), the position specifying unit 111b generates the mesh network generated by the generating unit 111a after the disappearance. The attachment position of the predetermined sensor terminal 100 is specified based on the connection state information.

  In the first embodiment, when the communication path including the predetermined sensor terminal 100 disappears from the mesh network, the position specifying unit 111b compares the mesh network connection state information generated by the generating unit 111a before and after the disappearance. Thus, the predetermined sensor terminal 100 is specified, and the attachment position of the predetermined sensor terminal 100 is specified based on the terminal position information (terminal position table). That is, in this embodiment, it is possible to specify the attachment position of the sensor terminal 100 that has become unable to communicate due to a change in the connection state information of the mesh network.

  Specifically, the position specifying unit 111b, based on the mesh network connection state information stored in a predetermined control cycle, the first sensor terminal 101, the second sensor terminal 102, the third sensor terminal 103, and the fourth sensor. It is determined whether or not the route information related to the terminal 104 has been lost, and the sensor terminal 100 in which the route information has been lost is specified.

  The location specifying unit 111b includes first connection state information I1 that is connection state information of the mesh network generated by the generation unit 111a before the loss of the predetermined sensor terminal 100, and a mesh network generated by the generation unit 111a after the loss. The second connection state information I2 that is the connection state information is compared. When there is route information related to the sensor terminal 100 that is included in the first connection state information I1 and not included in the second connection state information I2, the position specifying unit 111b is route information related to the predetermined sensor terminal 100. Is determined to have disappeared, and the sensor terminal 100 is specified.

  The position specifying unit 111b specifies the attachment position of the specified sensor terminal 100 with reference to the terminal position table (FIG. 3) stored in the storage unit 112. The position specifying unit 111b stores the information on the specified attachment position, that is, the information on the attachment position stored in association with the identification information of the sensor terminal 100 in which the route information is lost, as the specific attachment position P in the storage unit 112.

  For example, as shown in FIG. 4B, when the communication path including the third sensor terminal 103 disappears, the position specifying unit 111b is stored in association with the identification information (A3) of the third sensor terminal 103. The mounting position information Pc is stored in the storage unit 112 as the specific mounting position P.

  When a predetermined sensor terminal 100 that has become unable to communicate is replaced with a new sensor terminal 100 and the new sensor terminal 100 is powered on, a communication path including the new sensor terminal 100 appears in the mesh network.

  As illustrated in FIG. 2, when a communication path including a new sensor terminal 100 appears in the mesh network, the update unit 111c performs a new operation based on the connection state information of the mesh network generated by the generation unit 111a after the appearance. The terminal position information (terminal position table) stored in the storage unit 112 is updated by associating the identification information of the sensor terminal 100 with the information on the mounting position specified by the position specifying unit 111b (specific mounting position P).

  In the first embodiment, when the communication path including the new sensor terminal 100 appears in the mesh network, the update unit 111c compares the connection state information of the mesh network generated by the generation unit 111a before and after the appearance. Thus, a new sensor terminal 100 is specified. The updating unit 111c associates the identification information of the new sensor terminal 100 with the information on the attachment position specified by the position specifying unit 111b, and updates the terminal position information (terminal position table) stored in the storage unit 112. That is, in this embodiment, the attachment position of a new sensor terminal 100 can be automatically set by a change in connection state information of the mesh network.

  Specifically, the update unit 111c determines whether or not route information regarding the new sensor terminal 100 has appeared based on the connection state information of the mesh network stored in a predetermined control cycle, and the new sensor terminal 100 is specified.

  The update unit 111c includes second connection state information I2 that is connection state information of the mesh network generated by the generation unit 111a before the appearance of the route information regarding the new sensor terminal 100, and is generated by the generation unit 111a after the appearance. The third connection state information I3 that is the connection state information of the mesh network is compared. When there is route information regarding the sensor terminal 100 that is included in the third connection state information I3 and not included in the second connection state information I2, the update unit 111c includes the route information regarding the new sensor terminal 100. It determines with having appeared, and the sensor terminal 100 is specified.

  The updating unit 111c associates the identified identification information of the new sensor terminal 100 with the information on the mounting position specified by the position specifying unit 111b (specific mounting position P), and updates the terminal position table stored in the storage unit 112. To do.

  For example, as illustrated in FIG. 4C, a case where a communication path including the fifth sensor terminal 105 appears as a new sensor terminal 100 in the mesh network will be described. In this case, as illustrated in FIG. 8, the updating unit 111 c associates the address (A5) that is identification information of the fifth sensor terminal 105 with the mounting position information Pc set as the specific mounting position P, and the storage unit 112. Update the terminal location table stored in

  With reference to FIG. 9, an example of a method for automatically updating the information on the attachment position of the sensor terminal 100 by the control unit 111 of the gateway terminal 110 will be described. The process shown in FIG. 9 is repeatedly executed at a predetermined control cycle.

  In step S <b> 110, the generation unit 111 a of the control unit 111 generates a mesh network connection state information based on the routing table of each sensor terminal 100 received by the gateway terminal 110, and executes a process of storing in the storage unit 112. The process proceeds to step S120.

  In step S120, the position specifying unit 111b of the control unit 111 transmits the mesh network connection state information (current connection state information) generated in the current control cycle and a predetermined control cycle (for example, one control cycle). The generated mesh network connection state information (previous connection state information) is compared. Based on the comparison result, the position specifying unit 111b determines whether or not the route information regarding the first sensor terminal 101 in the previous connection state information is in the current connection state information. If it is determined in step S120 that there is route information related to the first sensor terminal 101, the process proceeds to step S130. If it is determined in step S120 that there is no route information related to the first sensor terminal 101, that is, if it is determined that the route information related to the first sensor terminal 101 has disappeared, the process proceeds to step S125.

  In step S125, the position specifying unit 111b of the control unit 111 acquires the identification information (A1) of the first sensor terminal 101, that is, specifies that the sensor terminal 100 from which the route information has disappeared is the first sensor terminal 101. . In step S125, the position specifying unit 111b refers to the terminal position table based on the identification information (A1) of the first sensor terminal 101, and specifies the attachment position information Pa stored in association with the first sensor terminal 101. The position P is stored in the storage unit 112, and the process proceeds to step S160.

  In step S130, the position specifying unit 111b of the control unit 111 compares the previous connection state information with the current connection state information. Based on the comparison result, the position specifying unit 111b determines whether or not the route information regarding the second sensor terminal 102 in the previous connection state information is in the current connection state information. If it is determined in step S130 that there is route information related to the second sensor terminal 102, the process proceeds to step S140. If it is determined in step S130 that there is no route information related to the second sensor terminal 102, that is, if it is determined that the route information related to the second sensor terminal 102 has disappeared, the process proceeds to step S135.

  In step S135, the position specifying unit 111b of the control unit 111 acquires the identification information (A2) of the second sensor terminal 102, that is, specifies that the sensor terminal 100 from which the route information has disappeared is the second sensor terminal 102. . In step S135, the position specifying unit 111b refers to the terminal position table based on the identification information (A2) of the second sensor terminal 102, and specifies the attachment position information Pb stored in association with the second sensor terminal 102. The position P is stored in the storage unit 112, and the process proceeds to step S160.

  In step S140, the position specifying unit 111b of the control unit 111 compares the previous connection state information with the current connection state information. Based on the comparison result, the position specifying unit 111b determines whether or not the route information related to the third sensor terminal 103 in the previous connection state information is in the current connection state information. If it is determined in step S140 that there is route information regarding the third sensor terminal 103, the process proceeds to step S150. If it is determined in step S140 that there is no route information related to the third sensor terminal 103, that is, if it is determined that the route information related to the third sensor terminal 103 has disappeared, the process proceeds to step S145.

  In step S145, the position specifying unit 111b of the control unit 111 acquires the identification information (A3) of the third sensor terminal 103, that is, specifies that the sensor terminal 100 from which the route information has disappeared is the third sensor terminal 103. . In step S145, the position specifying unit 111b refers to the terminal position table based on the identification information (A3) of the third sensor terminal 103, and specifies the attachment position information Pc stored in association with the third sensor terminal 103. The position P is stored in the storage unit 112, and the process proceeds to step S160.

  In step S150, the position specifying unit 111b of the control unit 111 compares the previous connection state information with the current connection state information. Based on the comparison result, the position specifying unit 111b determines whether or not the route information regarding the fourth sensor terminal 104 in the previous connection state information is in the current connection state information. If it is determined in step S150 that there is route information related to the fourth sensor terminal 104, the process returns to step S110. If it is determined in step S150 that there is no route information regarding the fourth sensor terminal 104, that is, if it is determined that the route information regarding the fourth sensor terminal 104 has disappeared, the process proceeds to step S155.

  In step S155, the position specifying unit 111b of the control unit 111 acquires the identification information (A4) of the fourth sensor terminal 104, that is, specifies that the sensor terminal 100 from which the route information has disappeared is the fourth sensor terminal 104. . In step S155, the position specifying unit 111b refers to the terminal position table based on the identification information (A4) of the fourth sensor terminal 104, and uses the attachment position information Pd stored in association with the fourth sensor terminal 104 as the specific attachment position. P is stored in the storage unit 112 as P, and the process proceeds to step S160.

  In step S160, the generation unit 111a of the control unit 111 performs the same generation process as in step S110. That is, in step S160, the generation unit 111a generates a mesh network connection state information based on the routing table of each sensor terminal 100 received by the gateway terminal 110, and executes a process of storing the information in the storage unit 112. Proceed to S170.

  In step S170, the updating unit 111c of the control unit 111 generates the mesh network connection state information (previous connection state information) generated in the current control cycle and a predetermined control cycle (for example, one control cycle before). Is compared with the connection status information (current connection status information) of the mesh network. In step S170, based on the comparison result, the update unit 111c determines whether or not the current connection state information includes route information related to the new sensor terminal 100 that is not included in the previous connection state information. If it is determined in step S170 that there is route information related to the new sensor terminal 100, that is, if it is determined that route information related to the new sensor terminal 100 has appeared, the process proceeds to step S180. If it is determined in step S170 that there is no route information related to the new sensor terminal 100, the process returns to step S160.

  In step S180, the updating unit 111c of the control unit 111 acquires an address (node ID) that is identification information of the new sensor terminal 100 from the appearing route information, that is, specifies the new sensor terminal 100. In step S180, the update unit 111c associates the acquired identification information of the new sensor terminal 100 with the specific attachment position P specified in any of steps S125, S135, S145, and S155, and is stored in the storage unit 112. The terminal location table is updated, and the process shown in FIG. 9 ends.

  According to 1st Embodiment mentioned above, there exists the following effect.

  When the communication path including the predetermined sensor terminal 100 is lost from the mesh network, the control unit 111 of the gateway terminal 110 is based on the mesh network connection state information (second connection state information I2) generated after the loss. The attachment position of the predetermined sensor terminal 100 that has disappeared is specified. After that, when a communication path including a new sensor terminal 100 appears in the mesh network, the control unit 111 performs a new operation based on the mesh network connection state information (third connection state information I3) generated after the appearance. The terminal information (terminal position table) stored in the storage unit 112 is updated by associating the identification information of the sensor terminal 100 with the information on the specified mounting position. Thus, when the incommunicable sensor terminal 100 is replaced with a new sensor terminal 100, the storage unit 112 automatically associates the identification information of the new sensor terminal 100 with the information on the mounting position of the sensor terminal 100. Is remembered. Therefore, it is not necessary for the worker to manually register information that associates the identification information of the new sensor terminal 100 with the information on the mounting position by manual input or the like, so that the replacement workability can be improved. It is also possible to prevent incorrect information from being registered.

  The gateway terminal 110 includes a storage unit 112 in which terminal position information (terminal position table) in which identification information of the sensor terminal 100 and information on the mounting position of the sensor terminal 100 are associated is stored in advance, and a route related to the plurality of sensor terminals 100 When the communication path including the predetermined sensor terminal 100 disappears from the mesh network, the generation unit 111a that generates the mesh network connection state information including information, and the mesh network connection state information generated by the generation unit 111a after the disappearance When the communication path including the new sensor terminal 100 appears in the mesh network and the position specifying unit 111b that specifies the attachment position of the predetermined sensor terminal 100 based on the mesh network generated by the generation unit 111a after the appearance Based on the connection status information of An update unit 111c that associates the identification information of the sensor terminal 100 with the information on the mounting position specified by the position specifying unit 111b and updates the terminal position information (terminal position table) stored in the storage unit 112. Yes. Thereby, compared with the case where the sensor terminal 100 is provided with the structure equivalent to the said memory | storage part 112, the production | generation part 111a, the position specific | specification part 111b, and the update part 111c, the processing load of the sensor terminal 100 is reduced, Consumption of the battery 135 can be suppressed. Therefore, the communication state of the sensor network system 10 can be maintained in a good state over a long period. In addition, the maintenance of the sensor network system 10 is improved by consolidating the functions into the gateway terminal 110 attached in the cabin 3a.

Second Embodiment
A sensor network system 10 according to a second embodiment of the present invention will be described with reference to FIG. 1, FIG. 10, and FIG. The following description will focus on differences from the first embodiment, and in the figure, the same or corresponding components as those described in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. . The sensor network system 10 according to the second embodiment has the same configuration as the sensor network system 10 according to the first embodiment shown in FIGS.

  In the second embodiment, the mesh network connection state information stored in the storage unit 112 includes information on the radio field strength between the plurality of sensor terminals 100 and the radio field strength between the plurality of sensor terminals 100 and the gateway terminal 110. The reception strength level between the communication nodes is included. For example, as illustrated in FIG. 10, the storage unit 112 of the gateway terminal 110 stores a radio wave intensity table including information on reception intensity levels between communication nodes. The radio wave intensity table is detected by the reception intensity detection unit 136 of each sensor terminal 100 and is transmitted based on the transmitted radio wave intensity information and the radio field intensity information detected by the reception intensity detection unit 114 of the gateway terminal 110. It is updated at the control cycle.

  The reception intensity level between the gateway terminal (GW) and the first sensor terminal (A1) is L1. The reception intensity level between the gateway terminal (GW) and the second sensor terminal (A2) is L2. The reception intensity level between the gateway terminal (GW) and the third sensor terminal (A3) is L3. The reception intensity level between the gateway terminal (GW) and the fourth sensor terminal (A4) is L4. The reception intensity level between the first sensor terminal (A1) and the second sensor terminal (A2) is L5. The reception intensity level between the first sensor terminal (A1) and the third sensor terminal (A3) is L6. The reception intensity level between the first sensor terminal (A1) and the fourth sensor terminal (A4) is L7. The reception intensity level between the second sensor terminal (A2) and the third sensor terminal (A3) is L8. The reception intensity level between the second sensor terminal (A2) and the fourth sensor terminal (A4) is L9. The reception intensity level between the third sensor terminal (A3) and the fourth sensor terminal (A4) is L10.

  When the communication path including two or more sensor terminals 100 disappears from the mesh network, the position specifying unit 111b determines the attachment positions of the two or more sensor terminals 100 based on the connection state information of the mesh network before and after the disappearance. Identify.

  Specifically, the position specifying unit 111b compares the first connection state information I1 and the second connection state information I2. When there is route information related to the sensor terminal 100 that is included in the first connection state information I1 and not included in the second connection state information I2, the position specifying unit 111b loses the route information related to the predetermined sensor terminal 100. The sensor terminal 100 is identified. The position specifying unit 111b determines whether there are two or more specified sensor terminals 100.

  When there are two or more specified sensor terminals 100, the position specifying unit 111b associates the identification information of the specified sensor terminal 100 with the information on the mounting position of the specified sensor terminal 100 and stores them in the storage unit 112. . The position specifying unit 111b stores the information on the specified mounting position of the sensor terminal 100 in the storage unit 112 as the specific mounting position Pi (i is an integer from 1 to the total number of specified sensor terminals).

  For example, as illustrated in FIG. 11B, a case where a communication path including each of the third sensor terminal 103 and the fourth sensor terminal 104 disappears will be described. In this case, the position specifying unit 111b associates the specified identification information (A3) of the third sensor terminal 103 with the information Pc of the attachment position of the third sensor terminal 103 and stores them in the storage unit 112. The position specifying unit 111b stores information Pc of the attachment position of the third sensor terminal 103 in the storage unit 112 as the first specific attachment position P1. Further, the position specifying unit 111b associates and stores the information Pd of the mounting position of the fourth sensor terminal 104 and the identification information (A4) of the fourth sensor terminal 104 in the storage unit 112. The position specifying unit 111b stores information Pd of the mounting position of the fourth sensor terminal 104 in the storage unit 112 as the second specific mounting position P2.

  When the communication path including the new sensor terminal 100 appears, the update unit 111c identifies and identifies the new sensor terminal 100 based on the mesh network connection state information including information about the radio wave intensity before and after the appearance. The terminal position information (terminal position table) stored in the storage unit 112 is updated by associating the information with the mounting position specified by the unit 111b (specific mounting position Pi).

  Specifically, the updating unit 111c compares the third connection state information I3 with the second connection state information I2. When there is route information related to the sensor terminal 100 that is included in the third connection state information I3 and is not included in the second connection state information I2, the update unit 111c appears with new route information about the sensor terminal 100. Is determined.

  When it is determined that the route information related to the new sensor terminal 100 has appeared, the generation unit 111 a stores information related to the radio wave intensity between communication nodes including the new sensor terminal 100 in the storage unit 112. The update unit 111c is specified by the identification information and the position specifying unit 111b of the sensor terminal 100 in which the route information appears, taking into account the information (information before and after the appearance of the route information) of the radio wave intensity table stored in the storage unit 112. The terminal position table stored in the storage unit 112 is updated by associating the information with the mounting position information (specific mounting position Pi).

  For example, as illustrated in FIG. 11C, when a communication path including the fifth sensor terminal 105 appears, the update unit 111c stores the sensor terminal 100 stored in association with the specific attachment position Pi (P1, P2). Based on the identification information (A3, A4), the reception intensity level relating to the third sensor terminal 103 and the fourth sensor terminal 104 is acquired by referring to the radio wave intensity table. The reception intensity level relating to the third sensor terminal 103 is the intensity information (3), (6), (8), (10) of the radio wave intensity table, and the reception intensity level relating to the fourth sensor terminal 104 is the radio wave intensity table. Intensity information (4), (7), (9), and (10).

  The update unit 111c performs processing for excluding information that cannot be used to specify the mounting position of the new sensor terminal 100 from the acquired intensity information of the radio wave intensity table regarding the third sensor terminal 103. That is, the update unit 111c stores the strength information (10) in the radio wave strength table between the sensor terminals 100 in which the route information has been lost, and the strength information (3) and (4) whose reception strength level is less than a predetermined threshold. Perform the removal process. Based on the intensity information (6) to (9), the update unit 111c has a reception intensity level related to the fifth sensor terminal 105 that includes a reception intensity level related to the third sensor terminal 103 and a reception intensity level related to the fourth sensor terminal 104. Determine which one is closest.

  The updating unit 111c determines whether the reception intensity level related to the fifth sensor terminal 105 is closer to the reception intensity level related to the third sensor terminal 103 or the reception intensity level related to the fourth sensor terminal 104. For example, the update unit 111c includes a reception intensity level La between the fifth sensor terminal 105 and the first sensor terminal 101, a reception intensity level L6 between the third sensor terminal 103 and the first sensor terminal 101, It is determined which of the reception intensity levels L7 between the 4-sensor terminal 104 and the first sensor terminal 101 is closer. The update unit 111c sequentially compares other intensity information.

  The updating unit 111c determines the number N1 of times when the reception intensity level between the fifth sensor terminal 105 and the predetermined communication node is determined to be the closest to the reception intensity level between the third sensor terminal 103 and the predetermined communication node. Count. The update unit 111c determines that the reception intensity level between the fifth sensor terminal 105 and the predetermined communication node is the closest to the reception intensity level between the fourth sensor terminal 104 and the predetermined communication node N2. Count. The updating unit 111c compares the number of times N1 and the number of times N2. Based on the comparison result, the updating unit 111c determines that the reception intensity level related to the sensor terminal 100 having the larger number of times determined to be closest is closest to the reception intensity level related to the fifth sensor terminal 105.

  For example, a case where it is determined that the reception intensity level related to the fifth sensor terminal 105 is closest to the reception intensity level related to the third sensor terminal 103 will be described. In this case, the update unit 111c associates the identification information (A5) of the fifth sensor terminal 105 with the information Pc (= first specific attachment position P1) of the attachment position of the third sensor terminal 103, and stores them in the storage unit 112. .

  Similarly, when the communication path including the fifth sensor terminal 105 and the communication path including the sixth sensor terminal 106 appear at the same time, the fifth information is based on the intensity information (6) to (9). The identification information (A5, A6) of the sensor terminal 105 and the sixth sensor terminal 106 is associated with the specific attachment position Pi (P1, P2).

  When the number of sensor terminals 100 specified by the position specifying unit 111b is less than two, that is, one, the attachment position of the specified sensor terminal 100 is specified by the same processing as in the first embodiment, and the update unit 111c The terminal location table is updated.

  According to such 2nd Embodiment, in addition to the effect similar to 1st Embodiment, there exists the following effect.

  When the communication path including two or more sensor terminals 100 disappears, the control unit 111 of the gateway terminal 110 includes information on the radio wave intensity before and after the appearance when the communication path including the new sensor terminal 100 appears. Based on the connection status information of the mesh network, the terminal position information (terminal position table) stored in the storage unit 112 by associating the identification information of the new sensor terminal 100 with the information on the mounting position specified by the position specifying unit 111b Update. With such a configuration, even when two or more sensor terminals 100 become incapable of communication and then replaced with a new sensor terminal 100, the identification information of the new sensor terminal 100 and the sensor terminal 100 are automatically updated. Information on the attachment position to be attached is appropriately associated and stored in the storage unit 112. Therefore, in the replacement work after two or more sensor terminals 100 become incapable of communication, there is no need for the operator to re-register the identification information of the new sensor terminal 100 and the information on its mounting position by manual input or the like. Thus, the replacement workability can be improved.

  The following modifications are also within the scope of the present invention, and it is possible to combine the structure shown in the modification and the structure described in the above embodiment, or to combine the structures described in the following different modifications. It is.

<Modification 1>
In the above embodiment, when the communication path including the predetermined sensor terminal 100 disappears from the mesh network, the position specifying unit 111b compares the mesh network connection state information generated by the generating unit 111a before and after the disappearance. Although an example in which the predetermined sensor terminal 100 is specified and the mounting position of the predetermined sensor terminal 100 is specified based on the terminal position information has been described, the present invention is not limited to this. As a method for specifying the predetermined sensor terminal 100, various methods that can be specified based on the mesh network connection state information generated by the generation unit 111a after the disappearance of the communication path including the predetermined sensor terminal 100 can be adopted. For example, the following specific method may be adopted.

  When the communication path including the predetermined sensor terminal 100 disappears from the mesh network, the position specifying unit 111b stores the identification information of the sensor terminal 100 included in the second connection state information I2 of the mesh network and the storage unit 112. The identification information of the sensor terminal 100 included in the received terminal position information is compared. The position specifying unit 111b specifies the predetermined sensor terminal 100 based on the comparison result, and specifies the mounting position of the predetermined sensor terminal 100 based on the terminal position information.

  For example, when the communication path including the third sensor terminal 103 is lost, the position specifying unit 111b includes the identification information (A1, A2, A4) of the sensor terminal 100 included in the second connection state information I2 and the terminal position information. Are compared with the identification information (A1, A2, A3, A4) of the sensor terminal 100 included in. The identification information of the sensor terminal 100 included in the second connection state information I2 does not include the identification information (A3) of the third sensor terminal 103 included in the terminal position information. For this reason, the position specifying unit 111 b specifies that the predetermined sensor terminal 100 that has become unable to communicate is the third sensor terminal 103. Further, the position specifying unit 111b refers to the terminal position information, and stores in the storage unit 112, as the specific mounting position P, the mounting position information Pc stored in association with the third sensor terminal 103.

  That is, in the first modification, the attachment position of the sensor terminal 100 that has become unable to communicate can be specified by the terminal position information and the current mesh network connection state information. For this reason, unlike the above-described embodiment, it is not necessary to hold the mesh network connection state information before the predetermined control period, and thus the used capacity of the storage unit 112 can be reduced.

<Modification 2>
In the above embodiment, when the communication path including the new sensor terminal 100 appears in the mesh network, the update unit 111c compares the connection status information of the mesh network generated by the generation unit 111a before and after the appearance, Terminal position information stored in the storage unit 112 by identifying the new sensor terminal 100, associating the identification information of the new sensor terminal 100 with the specific mounting position P, which is information of the mounting position specified by the position specifying unit 111b Although the example which updates is demonstrated, this invention is not limited to this. As a method of specifying a new sensor terminal 100, various methods of specifying based on connection state information of a mesh network generated by the generation unit 111a after the appearance of a communication path including the new sensor terminal 100 can be adopted. For example, the following specific method may be adopted.

  When the communication path including the new sensor terminal 100 appears in the mesh network, the update unit 111c identifies the sensor terminal 100 identification information included in the third connection state information I3 and the terminal position stored in the storage unit 112. The identification information of the sensor terminal 100 included in the information is compared. The update unit 111c identifies a new sensor terminal 100 based on the comparison result, associates the identification information of the new sensor terminal 100 with the specific mounting position P, which is information on the mounting position specified by the position specifying unit 111b, The terminal location information stored in the storage unit 112 is updated.

  For example, when a communication path including the fifth sensor terminal 105 appears, the updating unit 111c determines the identification information (A1, A2, A4, A5) of the sensor terminal 100 included in the third connection state information I3 and the terminal position. The identification information (A1, A2, A3, A4) of the sensor terminal 100 included in the information is compared. The identification information of the sensor terminal 100 included in the terminal position information does not include the identification information (A5) of the fifth sensor terminal 105 included in the third connection state information I3. For this reason, the update unit 111c specifies that the new sensor terminal 100 that has started communication is the fifth sensor terminal 105. Furthermore, the update unit 111c associates the identification information (A5) of the fifth sensor terminal 105, which is the new sensor terminal 100, with the specific mounting position P, which is information on the mounting position specified by the position specifying unit 111b, and stores the storage unit The terminal location information stored in 112 is updated.

  That is, in the second modification, a new attachment position of the sensor terminal 100 can be automatically set based on the terminal position information and the current mesh network connection state information. For this reason, unlike the above-described embodiment, it is not necessary to hold the mesh network connection state information before the predetermined control period, and thus the used capacity of the storage unit 112 can be reduced.

<Modification 3>
In the above embodiment, the example in which the control unit 111 of the gateway terminal 110 performs the automatic update processing of the attachment position of the new sensor terminal 100 has been described, but the present invention is not limited to this. Each sensor terminal 100 may have all or a part of the configuration corresponding to the storage unit 112, the generation unit 111a, the position specification unit 111b, and the update unit 111c of the gateway terminal 110 described in the above embodiment. In addition, the sensor network system 10 includes a server that can exchange information with the gateway terminal 110 by wireless or wired communication. The server includes the storage unit 112, the generation unit 111a, the position of the gateway terminal 110 described in the above embodiment. You may have all or one part of the structure corresponded to the specific | specification part 111b and the update part 111c.

<Modification 4>
In the above-described embodiment, the example in which the detection information transmitted from the sensor terminal 100 to the gateway terminal 110 is information on the pressure of the hydraulic cylinder has been described, but the present invention is not limited to this. Various information in each part of the excavator may be detected, and the detection information may be transmitted to the gateway terminal 110. The detection information includes, for example, information on the temperature of the hydraulic fluid of each actuator, information on the voltage of the battery 135 of the sensor terminal 100, and the like.

<Modification 5>
In the above embodiment, an example in which the sensor network system 10 is applied to the hydraulic excavator 1 has been described, but the present invention is not limited to this. In addition, the present invention is not limited to being applied to a work machine. For example, the present invention may be applied to networks in factories, offices, and homes.

<Modification 6>
In the said embodiment, although the some sensor terminal 100 demonstrated the example which is respectively the same structure, this invention is not limited to this. It suffices that at least the plurality of sensor terminals 100 can perform wireless communication according to the same communication standard. For example, the first sensor terminal 101 detects pressure, transmits the detected pressure information directly or indirectly to the gateway terminal 110, the second sensor terminal 102 detects temperature, and the detected temperature information is directly or indirectly transmitted. Alternatively, the information may be transmitted to the gateway terminal 110.

  The configuration, operation, and effect of the embodiment of the present invention configured as described above will be described together.

  The sensor network system 10 is a sensor network system including a mesh network including a gateway terminal 110 and a plurality of sensor terminals 100 that transmit detection information detected by the detection unit 132 to the gateway terminal 110. A storage unit 112 in which terminal position information in which identification information on 100 and information on an attachment position of the sensor terminal 100 are associated is stored in advance, and mesh network connection state information including route information on the plurality of sensor terminals 100 is generated. When the communication path including the predetermined sensor terminal 100 is lost from the generation unit 111a and the mesh network, the attachment position of the predetermined sensor terminal 100 is based on the connection state information of the mesh network generated by the generation unit 111a after the loss. Position specifying unit 1 for specifying 1b and, when a communication path including a new sensor terminal 100 appears in the mesh network, the identification information and position of the new sensor terminal 100 based on the connection state information of the mesh network generated by the generation unit 111a after the appearance An update unit 111c that associates the information on the attachment position specified by the specifying unit 111b with each other and updates the terminal position information stored in the storage unit 112.

  In this configuration, when the sensor terminal 100 at a predetermined attachment position is replaced, the terminal position information is automatically updated based on the connection state of the mesh network including the new sensor terminal 100. That is, when the incommunicable sensor terminal 100 is replaced with a new sensor terminal 100, the identification information of the new sensor terminal 100 and the mounting position information of the sensor terminal 100 are automatically associated with each other in the storage unit 112. Remembered. Therefore, it is not necessary for the worker to manually register information that associates the identification information of the new sensor terminal 100 with the information on the mounting position by manual input or the like, so that the replacement workability can be improved.

  In the sensor network system 10, when the communication path including the predetermined sensor terminal 100 is lost from the mesh network, the position specifying unit 111b compares the mesh network connection state information generated by the generation unit 111a before and after the loss. Thus, the predetermined sensor terminal 100 is specified, and the mounting position of the predetermined sensor terminal 100 is specified based on the terminal position information.

  In this configuration, the attachment position of the predetermined sensor terminal 100 can be specified by the change in the connection state information of the mesh network.

  The sensor network system 10 includes a sensor terminal included in the mesh network connection state information generated by the generation unit 111a after the disappearance of the communication path including the predetermined sensor terminal 100 from the mesh network. 100 identification information and the identification information of the sensor terminal 100 included in the terminal position information stored in the storage unit 112 are compared to identify the predetermined sensor terminal 100, and based on the terminal position information, The mounting position of the sensor terminal 100 is specified.

  In this configuration, the attachment position of the sensor terminal 100 that has become unable to communicate can be specified by the terminal position information and the current mesh network connection state information.

  In the sensor network system 10, when a communication path including the new sensor terminal 100 appears in the mesh network, the update unit 111 c compares the connection status information of the mesh network generated by the generation unit 111 a before and after the appearance. The new sensor terminal 100 is specified, the identification information of the new sensor terminal 100 is associated with the information on the mounting position specified by the position specifying unit 111b, and the terminal position information stored in the storage unit 112 is updated.

  In this configuration, a new attachment position of the sensor terminal 100 can be automatically set by a change in the connection state information of the mesh network.

  The sensor network system 10 includes a sensor terminal 100 included in the mesh network connection state information generated by the generation unit 111a after the appearance when a communication path including the new sensor terminal 100 appears in the mesh network. The identification information of the sensor terminal 100 is compared with the identification information of the sensor terminal 100 included in the terminal position information stored in the storage unit 112, and the new sensor terminal 100 is identified. The terminal position information stored in the storage unit 112 is updated by associating it with the information on the mounting position specified by the position specifying unit 111b.

  In this configuration, a new sensor terminal 100 mounting position can be automatically set based on the terminal position information and the current mesh network connection state information.

  In the sensor network system 10, the mesh network connection state information includes information on the radio field strength between the plurality of sensor terminals 100 and the radio field strength between the plurality of sensor terminals 100 and the gateway terminal 110. 111b specifies the attachment position of two or more sensor terminals 100 based on the connection state information of the mesh network before and after the disappearance when a communication path including two or more sensor terminals 100 disappears from the mesh network, When the communication unit including the new sensor terminal 100 appears, the update unit 111c identifies and identifies the new sensor terminal 100 based on the connection state information of the mesh network including information on the radio wave intensity before and after the appearance. The storage unit 11 associates the information with the mounting position information specified by the unit 111b. To update the stored terminal location information.

  In this configuration, in an exchange operation after two or more sensor terminals 100 become incapable of communication, an operator re-registers the identification information of the new sensor terminal 100 and the information on its mounting position by manual input or the like. Can be eliminated and the replacement workability can be improved.

  In the sensor network system 10, the gateway terminal 110 includes a storage unit 112, a generation unit 111a, a position specification unit 111b, and an update unit 111c.

  In this configuration, the gateway terminal 110 identifies the mounting position of the predetermined sensor terminal 100 that has become unable to communicate, associates the identification information of the new sensor terminal 100 with the identified mounting position information, and sets the terminal position information. Since the automatic update process to update is performed, the processing load of the sensor terminal 100 can be reduced.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  DESCRIPTION OF SYMBOLS 10 ... Sensor network system, 100 ... Sensor terminal, 110 ... Gateway terminal, 111a ... Generation part, 111b ... Location specific part, 111c ... Update part, 112 ... Storage part 132... Detection unit

Claims (7)

A sensor network system including a mesh network comprising a gateway terminal and a plurality of sensor terminals that transmit detection information detected by a detection unit to the gateway terminal,
A storage unit preliminarily storing terminal position information in which identification information of the sensor terminal and information on the mounting position of the sensor terminal are associated;
A generating unit that generates connection state information of the mesh network including route information regarding the plurality of sensor terminals;
A position for specifying the attachment position of the predetermined sensor terminal based on connection state information of the mesh network generated by the generation unit after the loss when a communication path including the predetermined sensor terminal is lost from the mesh network A specific part,
When a communication path including a new sensor terminal appears in the mesh network, the identification information of the new sensor terminal and the location specification based on the connection state information of the mesh network generated by the generation unit after the appearance A sensor network system comprising: an update unit that associates information on the attachment position specified by the unit and updates the terminal position information stored in the storage unit. The sensor network system according to claim 1,
The location specifying unit compares the mesh network connection state information generated by the generation unit before and after the disappearance when the communication path including the predetermined sensor terminal is lost from the mesh network, A sensor network system that identifies a sensor terminal and identifies an attachment position of the predetermined sensor terminal based on the terminal position information. The sensor network system according to claim 1,
When the communication path including the predetermined sensor terminal disappears from the mesh network, the position specifying unit includes the identification information of the sensor terminal included in the connection state information of the mesh network generated by the generation unit after the disappearance The predetermined sensor terminal is identified by comparing the identification information of the sensor terminal included in the terminal position information stored in the storage unit, and the predetermined sensor terminal is based on the terminal position information Sensor network system that identifies the mounting position of the sensor. In the sensor network system according to any one of claims 1 to 3,
When the communication unit including a new sensor terminal appears in the mesh network, the update unit compares the mesh network connection state information generated by the generation unit before and after the appearance, thereby the new sensor. A sensor network system that identifies a terminal, associates identification information of the new sensor terminal with information on an attachment position identified by the position identifying unit, and updates the terminal position information stored in the storage unit. In the sensor network system according to any one of claims 1 to 3,
The update unit, when a communication path including a new sensor terminal appears in the mesh network, the identification information of the sensor terminal included in the connection state information of the mesh network generated by the generation unit after the appearance, The new sensor terminal is identified by comparing the identification information of the sensor terminal included in the terminal position information stored in the storage unit, and the identification information of the new sensor terminal and the position identification unit A sensor network system for associating with the information on the mounting position specified by, and updating the terminal position information stored in the storage unit. In the sensor network system according to any one of claims 1 to 5,
The mesh network connection state information includes information on the radio field intensity between the plurality of sensor terminals and the radio field intensity between the plurality of sensor terminals and the gateway terminal,
When the communication path including two or more sensor terminals is lost from the mesh network, the position specifying unit attaches the two or more sensor terminals based on connection state information of the mesh network before and after the loss. Identify the location,
The update unit, when a communication path including a new sensor terminal appears, based on the connection status information of the mesh network including information on the radio wave intensity before and after the appearance, the identification information of the new sensor terminal and the A sensor network system that associates information on an attachment position specified by a position specifying unit and updates the terminal position information stored in the storage unit. In the sensor network system according to any one of claims 1 to 6,
The sensor network system in which the gateway terminal includes the storage unit, the generation unit, the position specifying unit, and the update unit.

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