JP2013238058A - State monitoring system and method of road sign tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize a falling direction and a moving distance of a road sign tool.SOLUTION: In a state monitoring system of mounting sensor units in a biaxial prescribed direction and monitoring the state of displacement of a plurality of sign tools that are arrayed as prescribed, a monitoring device includes: first processing means of performing processing of issuing a command for monitoring the state of the plurality of sensor units and acquiring state information of the sensor units, and processing of acquiring acceleration information transmitted from the sensor unit in which an acceleration sensor has detected the displacement of abnormal acceleration; and second processing means of preparing a display pattern corresponding to the magnitude of biaxial acceleration from the acquired acceleration information, determining the direction of display of the display pattern according to the direction of the biaxial acceleration recognized from the acceleration information, and preparing the display pattern. Corresponding to the ID of the sensor unit in which the displacement of the abnormal acceleration has been detected, the display pattern prepared by the second processing means is displayed on a screen of a display device.

Description

  The present invention relates to a sign monitoring state monitoring system and method, and more particularly, to a state monitoring system and method for monitoring the fall of a frustoconical road sign and displaying the situation.

  A truncated cone-shaped road sign device is called a rubber cone, a color cone (registered trademark), or a road cone, and is widely used for guidance of vehicles on roads and parking lots, or guidance of people at event venues. Yes. In particular, rubber cones used to clearly indicate construction sections on expressways, etc., may fall over due to vehicle contact or strong winds, etc. Can sometimes lead to accidents. For this reason, in the past, an attendant regularly patrols the installation site of the rubber cone.

  In addition, recently, as disclosed in Patent Document 1, a system in which the rollover and movement of a rubber cone are monitored systematically using a sensor and wireless technology, thereby omitting the work of regular patrolling by a staff member. Has been proposed. That is, a sensor (vibration sensor, impact sensor, tilt sensor) that senses at least one of the vibration and tilt of the sign device is built in the sign device, and the output of this sensor is processed to detect abnormal conditions due to vibration or tilt exceeding the standard. There is disclosed a state monitoring system for a sign instrument that, when detected, notifies that it is abnormal via a wireless transmission circuit.

Japanese Patent Laid-Open No. 10-18242

  In the state monitoring system for a sign instrument described in Patent Document 1, the sensor state discrimination circuit 22 processes a signal of a vibration or tilt sensor to discriminate that an abnormal state due to vibration or tilt exceeding a reference has occurred, Regardless of the direction in which the instrument falls, if it exceeds the standard, it is judged as an abnormal condition. For example, even if the display device falls to a side that does not interfere with the passage of vehicles in the driving lane or overtaking lane, notification is made as an abnormal state, so the attendant must go to the installation location each time. Therefore, a monitoring system capable of recognizing the falling direction and the moving distance of the road sign is desired.

  In addition, the management of a large number of marker devices in the monitoring system described in Patent Document 1 is to assign different operation numbers to each marker device and enter the operation numbers with a sign pen or the like on the outer surface of each marker device. A number that means "number of operation number assigned to the device of the individual identification code" by the data processing function of the receiving device that operates the sign device in order in the test transmission mode and receives the test radio wave Create a conversion table. However, in this case, it takes time to manage a large number of marker devices, and the number of man-hours for installing the marker devices increases.

  An object of the present invention is to realize a marker monitoring system and method capable of recognizing the falling direction and moving distance of the marker.

  Another object of the present invention is to realize a state monitoring system and method that can easily identify and assign a number of road signs to be installed.

The marker status monitoring system according to the present invention is preferably a marker status monitoring system that monitors a displacement state of a plurality of markers arranged in a predetermined arrangement by a monitoring device.
A sensor unit mounted on the marker in a predetermined direction of two axes, the sensor unit being provided to an acceleration sensor that detects displacement of at least two axes of acceleration in the marker, and a self-sensor unit A memory for storing at least the unique ID, a means for adding the ID to information on the remaining battery level of the sensor unit and transmitting the information to the monitoring device according to an instruction from the monitoring device, and the acceleration sensor A processor having a means for adding the ID to the acceleration information detected by the transmitter and transmitting the information to the monitoring device; and information transferred from the monitoring device or another sensor unit. A wireless communicator that transfers to the monitoring device, and a battery that supplies power to these units,
The monitoring device includes information processing means, a storage unit, and a display,
The storage unit stores the ID of the sensor unit acquired from the plurality of sensor units in association with the arrangement of the plurality of sensor units, and includes acceleration information of the sensor unit corresponding to the ID. Keep a management DB that stores state information,
The indicator can display the acquired status information of the sensor unit on a screen,
The information processing means includes:
A process for issuing a command for monitoring the states of the plurality of sensor units and acquiring the state information of the sensor units, and acceleration information transmitted from the sensor units when the acceleration sensor detects an abnormal acceleration displacement First processing means for performing processing for acquiring
A display pattern corresponding to the magnitude of acceleration is created from the acquired acceleration information, and the display pattern is created by determining the display direction of the display pattern according to the direction of acceleration grasped from the acceleration information. Second processing means to
The indicator displays the display pattern created by the second processing means in association with the ID of the sensor unit that has detected an abnormal acceleration displacement. Configured as a monitoring system.

The marker status monitoring method according to the present invention is preferably a marker status monitoring method in which a monitoring device monitors the displacement states of a plurality of markers arranged in a predetermined manner.
The sensor unit includes an acceleration sensor that detects at least two-axis acceleration in the marker, a memory that stores at least a unique ID assigned to the sensor unit, and a battery of the sensor unit according to an instruction from the monitoring device. Means for adding the ID to the information on the remaining amount and transmitting the information to the monitoring device; and means for adding the ID to the information of the acceleration detected by the acceleration sensor and transmitting the information to the monitoring device. Having a processor, a wireless communication device for transferring information transferred from the monitoring device or another sensor unit to the other sensor unit or the monitoring device, and a battery for supplying power to these units. Attached to the marker in a predetermined direction,
The monitoring device stores the ID of the sensor unit acquired from the plurality of sensor units in association with the arrangement of the plurality of sensor units, and includes acceleration information of the sensor unit corresponding to the ID. Store state information in the management DB,
A process for issuing a command for monitoring the states of the plurality of sensor units and acquiring the state information of the sensor units, and acceleration information transmitted from the sensor units when the acceleration sensor detects an abnormal acceleration displacement The first process including the process of acquiring
Further, a display pattern corresponding to the magnitude of acceleration is created from the acquired acceleration information, and the display pattern is determined by determining the display direction of the display pattern according to the direction of acceleration grasped from the acceleration information. Do the second process to create,
When any of the markers is displaced, the display pattern created by the second process is displayed on the screen of the display unit in association with the ID of the sensor unit that has detected displacement of acceleration. It is comprised as a state monitoring method of the marker characterized by this.

  According to the present invention, it is easy to identify and number a large number of markers installed, and it is possible to recognize the falling direction and moving distance of the markers using an acceleration sensor and information processing means. .

The figure which shows the structure of the state monitoring system of the rubber cone in one Example. The figure which shows the structure of the sensor unit in one Example. The figure which shows the external appearance of the rubber cone in one Example. The figure which shows the example of arrangement | positioning of the rubber cone in one Example. The figure which shows the mode of the data communication between the sensor units in one Example (Example 1). The figure which shows the structural example of the data transferred between the sensor units in one Example. The flowchart figure which shows the initialization operation | movement in the rubber cone state monitoring system of one Example. The flowchart figure which shows the normal operation | movement in the rubber cone state monitoring system of one Example. The flowchart figure which shows the operation | movement at the time of abnormality in the state monitoring system of the rubber cone of one Example. The figure which shows the example of a display of the monitoring state of the rubber cone in one Example. The figure which shows the structure of rubber cone management DB in the rubber cone state monitoring system of one Example. The figure which shows the structure of the table showing the relationship between the moving amount | distance of the rubber cone in one Example, and a display pattern. The figure which shows the structure of the table showing the relationship between the display pattern with respect to the acceleration value in one Example, and the direction of acceleration. The figure which shows the mode of the data communication between the sensor units in Example 2. FIG. The figure which shows the mode of the data communication between the sensor units in Example 2. FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a rubber cone condition monitoring system in one embodiment.
This state monitoring system includes a monitoring device 1 that receives data wirelessly transmitted from a number of rubber cone sensor units (hereinafter simply referred to as sensor units) 2 via an antenna 17 and monitors the state of the rubber cone. Is done. The monitoring device 1 is a computer such as a server or a personal computer (PC). In one example, the monitoring device 1 is mounted on a monitoring vehicle that performs maintenance and monitoring of a highway. Further, the data of the monitoring result by the monitoring device 1 can be transmitted via the network 8 to the portable terminal 9 possessed by a highway worker or manager. Data communication between the sensor units 2 of the rubber cones arranged in large numbers will be described later with reference to FIGS.

  The monitoring device 1 includes a processing unit (CPU) 10 that executes a program to realize a predetermined function, a wireless communication unit 11 that transmits and receives data to and from the sensor unit 2, and a RAM that stores data and a program to be executed. The memory 12 includes a storage device 13 such as a hard disk, an input device 14 such as a keyboard and a mouse, a display device 15, and a communication unit 16 connected to the network 8. The processing device 10 executes a monitoring program and a display program stored in the memory 12, so that the monitoring unit 101 for monitoring the movement and direction of the rubber cone and the function of the display processing unit 102 for displaying the status thereof are displayed. To realize. These processing functions will be described later with reference to the flowcharts of FIGS.

FIG. 3 shows the appearance of a rubber cone according to one embodiment.
(A) shows an example of a rubber cone. The rubber cone 3 includes, for example, a truncated cone-shaped main body 301 having yellow and black striped signs and a pedestal 302 that supports the main body 301. The main body 301 is made of synthetic resin and is integrally formed with the pedestal 302, and the inside is hollow. A weight is embedded in the bottom of the pedestal 302 so that the main body 301 does not easily fall over. The top part 304 of the main body part 301 is made of a metallic reinforcing metal fitting, and a circular hole is opened at the upper end part, so that the hollow part of the main body part 301 can be visually confirmed.

  The sensor unit container 21 accommodates the sensor unit 2 therein, and a mounting portion 23 provided at a lower portion thereof is configured to be detachable from a top portion 304 of the rubber cone 3. The container 21 also mounts light emitting elements such as LEDs, and light emitted from the light emitting elements is irradiated to the outside through the irradiation surface 22. A screw groove is formed in the portion of the mounting portion 23 and the upper irradiation surface 22, and the mounting portion 23 is rotated to release the mounting portion 23 from the upper irradiation surface 22 portion and replace the battery inside. Can do. Further, the surface behind the irradiation surface 22 is a reflection surface, and the light of the light emitting element is reflected by the reflection surface and irradiated forward from the irradiation surface 22. When placing the sensor unit 2, the operator inserts the container 21 into the top 304 of the rubber cone 3 so that the irradiation surface 22 of the container 21 is perpendicular to the direction of the lane (toward the direction in which the vehicle comes). . As described above, the sensor unit 2 can be installed simply by inserting the mounting portion 23 of the container 21 into the top portion 304 of the rubber cone 3, so that the labor of the operator can be reduced.

  When the direction of the lane is the Y direction, the width direction of the lane, which is a direction perpendicular to the direction (that is, the irradiation surface), is the X direction. If the rubber cone falls in the lane width direction, the monitoring apparatus 1 can detect that the acceleration direction of the acceleration sensor 203 is the X direction.

(B) shows another configuration example of the rubber cone.
In this example, the sensor unit 2 is mounted on the main body 301 of the rubber cone 3. The rubber cone 3 has the same structure as that normally used except for the mark 303 on the pedestal 302. The sensor unit 2 is housed in a plastic container 21 together with a battery, and a fixing tool 24 such as a belt or a plastic ring is attached to the container 21. Although not shown in detail, the container 21 is provided with a battery storage part and a cover that can be opened and closed, and the battery can be stored or exchanged in the battery storage part by opening and closing the cover.
The operator places the rubber cone 3 on the road so that the mark 303 of the pedestal 302 is along the direction of the lane, and the top 304 is positioned so that the container 21 of the sensor unit 2 is positioned on the side where the mark 303 is displayed. Then, the fixture 24 is inserted and firmly attached to the truncated cone-shaped main body 301.

  In the examples of (A) and (B), the container 21 of the sensor unit 2 can be easily detached from the rubber cone 3, and the battery can be easily replaced. In general, when storing or transporting the rubber cone, the container 21 of the sensor unit 2 is removed, the main body 301 is inserted into a hollow portion in the main body of another rubber cone, and a plurality of rubber cones are stacked and stored. And can be transported. Since the container 21 of the sensor unit 2 can be removed from the rubber cone 3 and stored in another place, the circuit unit or battery of the sensor unit 2 is easily damaged by moisture or dust in the field. The situation that aging is early can be prevented.

  In addition, the rubber cone of this invention is not limited to the above-mentioned example, It can implement by deform | transforming further. For example, as shown in FIG. 3C, the sensor unit 2 is mounted inside the main body 301. The sensor unit 2 is housed together with a battery in a plastic container, and is configured to be detachable from the main body 301. A window portion 305 formed of a transparent member is provided in a part of the top portion 304, and light emitted from the illumination means mounted inside leaks outside through the window portion 305, and alerts the driver. Here, the position of the window portion 305 can be substituted for the mark 303 shown in FIG. The window 305 also functions as an identifier that determines the arrangement direction of the rubber cone 3, as with the mark 303.

  An operator arranges the rubber cone 3 on the road with the window portion 305 facing the vehicle in the lane direction. The driver of the vehicle can recognize the light emitted from the window portions 305 of the many rubber cones 3 arranged on the lane. Further, when the rubber cone falls in the lane width direction (X direction), the monitoring device 1 can detect the direction in which acceleration of the acceleration sensor 203 is applied.

FIG. 2 shows the configuration of the sensor unit.
The sensor unit 2 includes a processor 201, a memory 202, an acceleration sensor 203, a wireless communication device 204, an antenna 205, and a battery (for example, two single batteries) 206 that supplies power to these units.
The acceleration sensor 203 is a biaxial or triaxial acceleration sensor that detects acceleration generated when the rubber cone 3 falls, vibrates, or moves.

  The memory 202 stores various data and programs executed by the processor 201. The data includes a unique ID (sensor unit ID (hereinafter simply referred to as ID)) given in advance to the own sensor unit, acceleration data detected by the acceleration sensor 203, data transmitted from another rubber cone sensor unit, etc. Is included.

The processor 201 executes a control program and realizes several functions. For example, in response to an instruction from the monitoring device in the initialization mode, a response signal is generated by adding the self-ID to the data relating to the remaining battery level of the self-sensor unit. Secondly, in the normal mode, the state (radio wave state and remaining battery level) of the own sensor unit is detected in accordance with a command from the monitoring device, and the answer ID is created by adding the own ID to these data. Third, a response signal is created by adding the time and own ID to the acceleration data detected by the acceleration sensor 203 in an abnormal mode (such as a fall of a rubber cone). The answer signal created in this way is transmitted to the upstream sensor unit and finally transferred to the monitoring device. (These three modes will be described in detail with reference to FIG. 5).
The processor 201 also transmits a signal (command or the like) transmitted from the monitoring device 1 or the starting (upstream) sensor unit to the end (downstream) sensor unit, and is transmitted from the end sensor unit. It has a function (so-called relay function) for transferring a signal (answer signal in the above three modes) to the sensor unit or monitoring device on the origin side. The processor 201 has a timer by software and performs a time measuring operation.

Next, the arrangement of rubber cones will be described with reference to FIG.
A large number of rubber cones 3 are arranged at intervals of several tens of meters between the travel lane and the regulation lane. The monitoring vehicle 1 is equipped with a monitoring device 1 that realizes a rubber cone sensor state monitoring system. The monitoring vehicle 40 also includes a truck on which a large number of rubber cones 3 are loaded, and the rubber cones 3 are arranged and collected.

  The sensor units 2 of the large number of rubber cones 3 are connected to each other by a wireless path, and are wirelessly connected to the monitoring device 1 from the sensor unit 2 of the rubber cone 3 closest to the monitoring vehicle (hereinafter referred to as a starting point). In addition, the monitoring apparatus 1 does not need to be in the end point of the control area where many rubber cones 3 were arranged. The sensor units 2 are connected by a wireless sensor network constituting a multi-hop, for example, called ZigBee (registered trademark) standardized based on IEEE802.15.4, which is one of the short-range wireless communication standards. . In the illustrated example, the rubber cone 3 arranged second from the left shows a state where the rubber cone 3 is overturned to the traveling lane side (the overturned rubber cone 3 '). The monitoring device 1 can detect an abnormal state signal from the sensor unit of the rubber cone 3 ′ in the fall state through another sensor unit.

Next, data communication between the sensor units 2 will be described with reference to FIG.
In this embodiment, three types of communication modes are set as data communication with respect to sensor units 2 of a large number (n) of rubber cones arranged at intervals of several meters to several tens of meters. One is an operation in the initialization process of the sensor unit, which is an operation for collecting the IDs held in advance by each sensor unit and grasping the arrangement order of the sensor units (referred to as an initialization mode). The second is to receive a monitoring command issued from the monitoring device 1 periodically (for example, every hour) and notify the monitoring device of the remaining battery level and radio wave state of each sensor unit 2 (normal mode). Called). The third is communication for notifying the monitoring apparatus 1 of an abnormal state when the acceleration sensor 203 detects an abnormality in acceleration, such as when the rubber cone falls (referred to as an abnormal mode).

  In the initialization mode, the monitoring unit 101 issues confirmation signals to all sensor units, collects IDs assigned in advance to each sensor unit, and creates a list in which those IDs are described in the order of rubber cone arrangement. To do. The created list is stored in the storage unit 13. This list corresponds to, for example, the sensor unit ID and installation information fields of the rubber cone management DB shown in FIG. The processing operation in the initialization mode will be described in further detail with reference to FIG.

In the normal mode (normal operation confirmation mode), the monitoring unit 101 issues a confirmation command (sometimes referred to as a monitoring command) for confirming whether or not the sensor unit is operating normally in the order in which the sensor units are listed. Issue. Since a signal immediately arrives at several sensor units in the vicinity of the monitoring device 1, the time for obtaining the response signal is also fast, and the monitoring unit 101 can immediately check the state of the sensor units. On the other hand, for sensor units far away from the monitoring device 1 (for example, # k-th to # n-th sensor units), a destination (ID) described in the list is designated and sequentially performed, so that it becomes a relay station. The sensor unit sequentially transfers monitoring instructions to the target sensor unit. Also in this case, if the survival confirmation to the # k-th sensor unit is performed, the monitoring command is further transferred to # k + 1, # k + 2,... #N (end point: there are two cases), and the end point sensor When the transfer to the unit #n is completed, the transfer for checking the # k-th sensor unit ends. When a monitoring command is transmitted from the monitoring device 1 to the # k-th sensor unit, the # k-th sensor unit receives a signal from the monitoring device 1 and then sends its own ID and battery remaining amount to the monitoring device 1. The monitoring apparatus 1 transmits a response signal composed of information, receives it and issues a reception completion signal. When the sensor unit with the ID receives the completion signal, the operation is completed. On the other hand, when the completion signal from the monitoring apparatus 1 is not received, the response signal is retransmitted.
Each time each sensor unit 2 receives a monitoring command, it sequentially transfers its own sensor unit status information (status information relating to the remaining battery level and radio wave intensity) to the sensor unit 2 on the origin side. The state information is finally sent to the monitoring device 1. The processing operation in the normal mode will be described in detail with reference to FIG.

  In the abnormal mode, the sensor unit 2 spontaneously transmits detection information even if there is no confirmation command from the monitoring device 1. That is, when the rubber cone 3 falls, the acceleration sensor 203 in the sensor unit detects a change in acceleration and transmits a response signal including data of the detected acceleration to the monitoring device 1. When the sensor unit is away from the monitoring device 1, a response signal emitted from a certain sensor unit is transferred to the monitoring device 1 through one or more sensor units arranged on the starting point side.

FIG. 6 shows the structure of data transferred between sensor units.
Data transferred between the monitoring device 1 and the sensor unit, and between the sensor units includes a header portion 61 including a transmission destination and transmission source ID (rubber cone sensor unit ID) based on IEEE802.15.4, and a data field. It consists of an application data field 62 and a checksum 63 for data check.

  The application data field 62 is a data part 622 that holds a message type 621 indicating the type of message, and detection information including the remaining amount of the battery attached to the sensor unit, the radio wave intensity, and acceleration data detected by the acceleration sensor 203. Consists of

  The message type 621 identifies whether data to be transmitted (including a command) is an initialization mode, a normal mode, an abnormal mode, and a command from the monitoring device 1 or a response from the sensor unit in each mode. . For example, in order to initialize each sensor unit in the initialization mode, a command issued by the monitoring unit 101 is represented by “01”, and a monitoring command issued by the monitoring unit 101 in the normal mode is represented by “10”. A state in which 3 falls and the acceleration sensor 203 detects acceleration is represented by an abnormal mode (“11”). Further, in the case of an instruction from the monitoring apparatus 1, “1” is further added to the head of the above 2 bits, and in the case of an answer from the sensor unit, “0” is further added to the head of the above 2 bits.

The remaining battery level is obtained by changing the voltage of two single batteries from 3.0v to 0v, for example, in 8 stages (for example, 3.0 to 2.7 v, 2.7 to 2.4 v, 2.4 to 2.2, 2.2 to 2.0 v, 2.0 to 1.8 v, 1.8 to 1.6, 1.6 to 1.4 v, 1.4 or less), and the remaining voltage of the battery is in any of the three stages.
Similarly, the radio wave intensity is expressed in 8 levels (3 bits).

FIG. 11 shows the configuration of a rubber cone management database (DB) in the rubber cone status monitoring system.
The rubber cone management DB is a sensor unit ID which is unique identification information given to each sensor unit, installation information indicating the order in which each rubber cone is installed, and the acquisition time (year) when detection information is acquired from the sensor unit. Month and date), information indicating the presence / absence of a signal from the sensor unit, the remaining battery level, the radio wave intensity, and the triaxial acceleration value detected by the acceleration sensor.

  The sensor unit ID is an ID collected from each sensor unit, and is sequentially stored in ascending order of the number of installation information (the order acquired from the side closer to the starting point). The sensor unit ID may be referred to as a rubber cone ID for identifying the rubber cone on which the sensor unit is mounted. In the example of FIG. 11, the sensor unit ID is a serial number such as “1001” to “1005”. However, since the sensor unit ID is unique identification information stored in advance in the memory of the sensor unit, In many cases, it is not necessary to be a serial number as shown.

  The rubber cone installation information indicates the number of rubber cones arranged in order from the monitoring device 1. For example, if the rubber cones are arranged at an interval of about 20 meters, the location where the rubber cones are installed (the distance from the monitoring device) can be known by grasping the number of the rubber cone.

  The remaining battery level is expressed in 8 levels from “000” to “111”. Similarly, the radio wave intensity is expressed in eight levels from “000” to “111”. As the acceleration value, three-axis data in the X, Y, and Z directions are acquired and stored. In this embodiment, the amount of movement and the direction of movement are calculated using the biaxial acceleration data in the X and Y directions.

FIG. 10 shows a display example of the monitoring status of the rubber cone.
When the rubber cone falls and its abnormality is detected, the CPU 10 calculates the fall amount and the fall direction of the rubber cone from the acquired acceleration data. Then, the calculation result is displayed and displayed on the display screen of the display 15. (Data processing and display processing by monitoring will be described later with reference to FIGS. 7 to 9).

  In FIG. 10, management information regarding the situation of the road to be monitored is displayed on the right side of the display screen, and the arrangement of the rubber cones and the abnormal state of the detected rubber cone are displayed on the left side. As for the display on the left side of the screen, the ID of the rubber cone detected as abnormal and its location (distance from the monitoring device 1) are displayed. Further, the displacement of the rubber cone (that is, the moving direction and the moving amount) is represented by the size of five substantially elliptical patterns of display patterns P1 to P5 and the display direction.

  FIG. 10 shows a long ellipse extending in the right 45 degree direction in the acceleration value X direction and the Y direction. That is, for a certain rubber cone k in which an abnormality has been detected, the direction and magnitude of the detected vector in the X direction and Y direction are calculated, and the display direction of the ellipse from the “direction” is calculated. Any one pattern from “size” to P0 to P5 is determined and displayed. It is assumed that the display direction is rotated 360 degrees clockwise by 15 degrees from the origin toward the Y direction (lane direction), and a total of 24 types of directions are set. Moreover, it shows that the moving amount | distance of a rubber cone is so large that it becomes P5.

Here, the value of the combined vector of the acceleration value vector in the X direction and the acceleration value vector in the Y direction is one, and it is appropriate to express it by one point of the display. However, according to the analysis and examination of the simulation by the inventor, there is a variation in the displacement of the sensor unit, and considering this variation, it is not practical but rather dangerous to represent the displacement with only one point. Therefore, the inventor considered that the displaced rubber cone should be displayed as being within the range of a plurality of ellipses from the center (one displacement point) of the plurality of ellipses P1 to P5. What is important is not only the size of the display pattern but also whether the estimated displacement and the display pattern are on the traveling lane side on which the vehicle passes.
The administrator can determine the degree of risk from the sensor unit ID displayed on the display screen and the direction and size of the display pattern of the rubber cone.

  Display on the screen of the display unit 15 is performed by executing a display processing program stored in the display processing unit 102, that is, the storage unit 13. The operator can select a road name, the number of lanes, a regulated lane (left and right), a rubber cone installation interval, and the like from a pull-down menu while viewing the display screen on which the content of FIG. 10 is displayed. Then, by checking the interval between the rubber cones (sensor units) displayed on the screen and the order of the rubber cones indicated by the list created by the monitoring unit 101, an abnormality has occurred in the sensor unit installed in what order. I understand. Also, the approximate distance to the sensor unit can be calculated.

FIG. 12 shows a configuration example of a display pattern definition table that stores the relationship between the amount of movement of the rubber cone and the display pattern.
The display pattern definition table is configured by preliminarily defining which display pattern of the display patterns P0 to P5 corresponds to the XY composite vector value of the acceleration value. This display pattern definition table is stored in the storage unit 13.
Here, the display pattern P0 indicates a state in which the rubber cone is not displaced. In this case, a small circle is displayed as shown in FIG. It should be noted that the display vector P0 includes the composite vector value “0001”, assuming that the rubber cone may be slightly displaced due to wind or vibration of the road accompanying the passage of a large vehicle. In such a case, the displacement is substantially regarded as “none”.
The display processing unit 102 refers to the table from the monitoring result of the monitoring unit 101, reads one display pattern corresponding to the combined vector value, and stores it in the display management table (FIG. 13).

FIG. 13 shows a configuration example of a display management table that stores the relationship between the display pattern accompanying the displacement of the rubber cone and its orientation.
The display management table stores the selected display pattern and the direction of the display pattern corresponding to the acceleration value acquired from the sensor unit detected as abnormal.
The display processing unit 102 determines that the XY composite vector value exceeds “0010” as abnormal from the monitoring status of the rubber cone stored in the rubber cone management DB. Then, the display processing unit 102 refers to the display pattern definition table for the rubber cone determined to be abnormal (for example, sensor unit IDs “1004” and “1005”), and displays the display pattern corresponding to the combined vector value. Read and store the display patterns P1 and P2 corresponding to the sensor unit ID in the display management table. Further, the direction of the combined vector is calculated, and the angle is stored in the column “direction of display pattern”.

Next, various operations in the rubber cone state monitoring system (processing operations in the initialization mode, the normal mode, and the abnormal mode) will be described with reference to FIGS.
First, the initialization operation in the rubber cone state monitoring system will be described with reference to FIG.
In the rubber cone state monitoring system in which rubber cones are arranged as shown in FIG. 5, the monitoring unit 101 of the monitoring device 1 sends a confirmation signal to the sensor unit 2 of the starting rubber cone via the wireless communication unit 11 and the antenna 17. Is transmitted (S701). The sensor unit 2 of the rubber cone that has received the confirmation signal determines whether or not it is the rubber cone at the end point (S702). Whether or not the end point is reached is determined when the IDs of the sensor units are sequentially collected during the initialization process. The determination as to whether or not the rubber cone is the end point is performed as follows.

  The starting sensor unit # 1 (ID is “1001”) requests a response from one downstream sensor unit, and when there is a normal response, a confirmation signal is sent to the next sensor unit # 2 (ID is “1002”). Send. Such an operation is sequentially performed on the downstream sensor unit. Then, there is no response from the next sensor unit in the sensor unit #n (ID is “100n”) in the final stage (that is, the end point). When there is no response within a predetermined time (or when a request signal is transmitted several times but there is no response), the sensor unit is determined as an end sensor unit.

  The sensor unit #n at the end point receives the confirmation signal sequentially transferred to each sensor unit existing between the sensor unit #n and the monitoring device 1 during the initialization process, and returns a response signal indicating that it has been received to the monitoring device 1. . In addition, an answer signal is also returned to a signal transmitted from the upstream sensor unit # n-1 thereafter, and this operation is repeated. In the case of the sensor unit at the end point, there is no answer signal returned from the downstream sensor unit no matter how many times the same signal is received, so that it can be identified as the end point. However, since the number of installed sensor units is known in advance, when the list (acquisition of the sensor unit ID in the management DB of FIG. 11) is completed in the monitoring device 1, the monitoring device 1 sends a command for confirming the radio wave intensity to each command. It transmits to a sensor unit (for example, # k-th sensor unit). The sensor unit #k that has received the command transmits the signal to another sensor unit downstream. The sensor unit that has received the signal transmits an answer signal including information indicating the radio wave intensity with respect to the received confirmation signal to the monitoring device 1. As a result, it is possible to identify the ID of the sensor unit closest to the sensor unit #k. It is possible to determine whether or not the sensor unit is the end point by sequentially repeating this. If the number of installations specified in advance matches the number in the list, the assignment of IDs to the sensor unit at the time of initialization is completed. On the other hand, when the above numbers do not match, it is possible to know which sensor unit is missing from the answer signal indicating the radio wave intensity.

  Returning to the description of FIG. 7, when it is determined that the end point sensor unit is not the end point rubber cone (S702: No), the rubber cone sensor unit 2 is the next rubber cone sensor unit 2. A confirmation signal is transmitted to (S703), and the above operation is repeated. On the other hand, when it is determined that the rubber cone is the end point as a result of the determination, the sensor unit 2 of the rubber cone transmits an answer signal to the sensor unit 2 of the previous rubber cone (S704). Then, it is determined whether the sensor unit 2 is the starting rubber cone (S705). If the result of determination is that the rubber cone is not the starting point, the above operation is repeated. On the other hand, if it is the sensor unit of the starting rubber cone, an answer signal is transmitted to the monitoring device 1 (S706).

Here, as to the meaning of the answer signal, the answer signal from the sensor unit at the time of initialization processing indicates that the ID assignment has been normally performed and that the operation of the sensor unit is normal. In addition, a response signal when the normal operation of the sensor unit is confirmed periodically after the initialization operation indicates that the operation of the sensor unit is normal. In any case, the answer signal includes the ID of the own sensor unit (see FIG. 6). When an abnormality occurs in the sensor unit, the mode is changed to the abnormality mode, and a response signal including information indicating abnormality such as displacement of the acceleration sensor is returned (this will be described later).
In addition, when giving ID to the sensor unit performed at the time of initialization processing, the monitoring apparatus 1 transmits a confirmation signal to the nearest sensor unit and requests an answer. Since the response signal from the sensor unit includes information on the radio wave intensity, the nearest sensor unit can be identified based on the radio wave intensity. As a result, an ID is assigned to the sensor unit. By sequentially repeating this operation on adjacent sensor units (that is, from the start point to the end point sensor unit), IDs are assigned to all the sensor units.

Next, a normal monitoring operation in the rubber cone state monitoring system will be described with reference to FIG.
A confirmation signal is issued from the monitoring unit 101 of the monitoring device 1 (S801), and the confirmation signal is transmitted to the sensor unit 2 of the first rubber cone (S802). The first sensor unit 2 further transmits the received confirmation signal to the next second sensor unit (S803). In this way, a confirmation signal is transmitted to the i-th sensor unit. Further, the i-th sensor unit determines whether there is a response signal from the (i + 1) -th sensor unit (S804). If the result of determination is that there is an answer signal (Yes), the above operation is repeated.

  Here, the confirmation signal includes the ID of the destination sensor unit described in the list regarding each sensor unit created by the monitoring unit 101 during the initialization process (see FIG. 6). The processor 201 of each sensor unit compares the ID that the received confirmation signal has with the ID that is given at the time of initialization and stored in the memory 202. If the IDs match, the battery detected by the sensor unit is detected. An answer signal for the monitoring device 1 is created by adding the ID of the sensor unit to the status information regarding the remaining amount. The answer signal is sent to the upstream sensor unit and finally sent to the monitoring device 1.

  On the other hand, when the confirmation signal from the monitoring device 1 does not reach the destination i-th sensor unit, one or a plurality of higher-order sensor units between the monitoring device 1 and the i-th sensor unit Since there is no answer signal, it is determined that the confirmation signal has not reached the i-th sensor unit, and the transfer of the confirmation signal to the i-th sensor unit is repeated for a predetermined time or a predetermined number of times.

  Each sensor unit repeats the above process, and the confirmation signal finally reaches the end sensor unit. However, while reaching the end sensor unit, each sensor unit determines whether its own sensor unit is the end sensor unit (S805). The determination of the sensor unit at the end point is made based on whether or not the own sensor unit receives an answer signal from a sensor unit downstream of the sensor unit. The sensor unit in the middle receives the answer signal from the sensor unit downstream, but the sensor unit at the end point does not receive the answer signal from the sensor unit downstream from it, so it must be the end point. Recognize

  As a result of the determination in S805, when it is determined that the own sensor unit is the end sensor unit, the sensor unit 2 creates an answer signal by itself and sends the answer signal to the previous sensor unit 2 (i−1). Is transmitted (S806). Then, it is determined whether the sensor unit is a starting sensor unit (S807). If the result of determination is “No”, (i−1) is further performed, and the processing operations of S806 to S807 are repeated. On the other hand, if it is determined that the sensor unit is the starting point as a result of the determination in S807, the sensor unit 2 transmits an answer signal to the monitoring device 1 (S811). The answer signal in this case is a signal indicating that the sensor unit is in a normal state.

  If it is determined in S805 that the sensor unit is not the terminal sensor unit (S805 “No”), (i−1) is performed, and an abnormality response signal is transmitted to the i-th sensor unit (S808). It is determined whether the sensor unit of the i-th rubber cone is the starting sensor unit (S809). As a result of the determination, if the sensor unit is not the starting point, the above operation is repeated. On the other hand, in the case of a starting rubber cone sensor unit, the rubber cone sensor unit transmits an abnormality response signal to the monitoring device 1 (S810).

  Note that the abnormality in the normal mode is assumed to be a decrease in the remaining battery level of the sensor unit and a loss of the communication function associated therewith. The answer signal obtained as a result of the status monitoring of each sensor unit, particularly the status information of the sensor unit determined to be abnormal, is formed as an error file by the monitoring unit 101 and stored in the storage unit 13.

Next, with reference to FIG. 9, the operation at the time of abnormality and the display process in the rubber cone state monitoring system will be described.
Here, the abnormal time means that the rubber cone has fallen and the acceleration sensor 203 of the sensor unit has detected a change in acceleration (amount of change in the X, Y, and Z axis directions). For example, when the i-th sensor unit detects displacement (S901), the processor 201 of the sensor unit #i creates a signal including the detected acceleration information and a unique ID, and directs the signal to the monitoring device 1. send. The answer signal may further include information on the remaining battery level and the occurrence time of the abnormality in the sensor unit. The abnormality occurrence time may be a time when the monitoring apparatus 1 receives a response signal from the sensor unit where the abnormality has occurred.

  Since the upstream sensor unit that has received the signal from sensor unit #i has an ID different from that of sensor unit #i, it can recognize that the destination is different from its own ID. Transfer to the unit. By repeating this operation, the answer signal is transferred to the monitoring device 1.

The monitoring device 1 receives an answer signal including acceleration information of the sensor unit #i of the i-th rubber cone, and includes information (that is, sensor unit ID, acceleration information, battery remaining amount and abnormality) included in the received answer signal. Is stored in the rubber cone management DB (S911).
Thereafter, the display process is started. The display processing unit 102 extracts X and Y-axis acceleration information stored in the rubber cone management DB (S912), and performs a display process of the monitoring status of the sensor unit of the target rubber cone (S913).

  In this display process, the display processing unit 102 uses the information of the sensor unit of the rubber cone stored in the rubber cone management DB and the XY composite vector value exceeds the threshold “0010” (for example, the sensor unit ID is “1004”). And “1005”). For the rubber cone determined to be abnormal, the display pattern corresponding to the combined vector value is read with reference to the display pattern definition table, and the display patterns P1 and P2 corresponding to the sensor unit ID are stored in the display management table. To do. Further, the direction of the combined vector is calculated, and the angle is stored in the column “direction of display pattern”.

  Thereafter, a display pattern is generated for each sensor unit ID stored in the display management table, and the display pattern is further rotated by a specified angle to create a final display pattern. Then, the created display pattern (for example, P1) is displayed on the display screen together with the sensor unit ID (see FIG. 10).

  Further, the display processing unit 102 sounds an alarm included in the monitoring device 1 (S914), and transmits abnormality information to the portable terminal 9 possessed by the worker (S915). This abnormality information is the screen information shown in FIG. The operator looks at the abnormality information displayed on the mobile terminal 9, goes to the location of the rubber cone where the abnormality has occurred, and returns the rubber cone to the normal position. When the displaced rubber cone is returned to its original position, the normal state is displayed on the display screen in the subsequent periodic confirmation operation of the rubber cone (FIG. 8). The administrator can confirm that the abnormal rubber cone has been restored by looking at the display of the normal state displayed on the display screen. Note that the abnormality information transmitted to the mobile terminal is not screen information but may be a mail expressing the abnormality information in text.

  Next, another embodiment will be described with reference to FIGS. 14A and 14B. This embodiment is a modification of FIG. 5 and shows an example in which the signal from the monitoring device or the upper sensor unit can be received by two or more sensor units because the radio wave intensity is good. The following explanation will be divided into (a) initialization, (b) radio wave intensity confirmation for obtaining information on the order of arrangement, (c) signal transmission when normal operation is confirmed, and (d) signal transmission when an abnormality occurs.

(A) Initialization First, at the time of initialization (that is, numbering operation of sensor unit ID), a signal is transmitted from the monitoring device 1 in the all-station mode. If the sensor units that can directly receive the signal from the monitoring device 1 are # 1 and # 2, the sensor units # 1 and # 2 immediately return an answer signal (indicated by a thick line) including the sensor unit ID to the monitoring device 1. . At the same time, the signal from the monitoring device 1 is transferred to another sensor unit (FIG. 14A (a)).

  Next, as shown in (b), when paying attention to the # k-th sensor unit, a signal from the monitoring device 1 is transferred from the # k-1 or earlier sensor unit. The # k-th sensor unit notifies the monitoring device 1 that it has been received, and transfers a signal (indicated by a dotted line) from the monitoring device to another sensor unit (on the downstream side). The response signal to the monitoring device 1 includes a response signal from the own sensor unit and a response signal from another downstream sensor unit that is relayed and transferred to the monitoring device 1.

(B) Confirmation of radio field intensity for obtaining information on the order of arrangement When the above initialization is completed, the ID acquired from the sensor unit that has responded is recorded in the rubber cone management DB of the monitoring device 1, and the sensor unit A list of arrays is created. Next, when the monitoring device 1 transmits a command for returning the information on the radio wave intensity, the sensor units that can be received are # 1 and # 2, and therefore, the response signal from the sensor units # 1 and # 2 to the response signal to the monitoring device 1 is a radio wave. Including the intensity information, it is sent to the monitoring device. As a result, the sensor unit closest to the monitoring device 1 can be recognized, and at the same time the adjacent sensor unit can be identified (c).

  Next, when the monitoring apparatus 1 transmits a command to # 2, # 2 transmits the received command to the surrounding (downstream) sensor units (d). This command is "The sensor unit that has received the signal transmitted from # 2 (the upper sensor unit) should transmit a signal including the radio wave intensity to the monitoring device." Thereby, the order of alignment of the sensor units installed near the sensor unit # 2 can be identified on the monitoring device 1 side.

At this time, # 1 can also receive the signal from # 2, but since the answer is sent back to the monitoring device 1 earlier, at this time, the response to the reception of the signal from # 2 to the monitoring device I do not. However, for example, those sent from # 4 and # 5 are transferred because the destination is the monitoring device 1. The monitoring device 1 issues a confirmation command to each sensor unit in order, and when a response signal transmitted to the monitoring device arrives, notifies the sensor unit that it has been received.
By repeating such an operation, the monitoring device 1 can recognize the sensor unit ID and the alignment order of the sensor units, and can create and hold a list of sensor units based on this.

(C) Signal transmission normal operation confirmation at the time of normal operation confirmation Based on a list including the order of alignment of sensor units in the monitoring device, it is performed in order. For example, as shown in (e), the normal operation check for the # k-th sensor unit is performed. At this time, a signal is transmitted from the monitoring device 1 toward the # k-th sensor unit. Since the first to # k-th sensor units have destinations different from their own IDs, the received signals are transferred to other sensor units.

  Thereby, the signal from the monitoring apparatus 1 can be received by the # k-th sensor unit. The # k-th sensor unit receives a signal from the monitoring device and transmits a signal including an identifier indicating that the device is operating normally to the monitoring device. The signal transfer to the monitoring device 1 is the same as described above. When the monitoring device receives a signal from the # k-th sensor unit, the monitoring device notifies the # k-th sensor unit that the signal has been received. By repeating this operation for the number of all installed sensor units in order from the sensor unit # 1, it is possible to check the normal operation of all the sensor units.

(D) Signal transmission when an abnormality occurs The monitoring device 1 performs the initialization and normal operation confirmation processing operations. On the other hand, when an abnormality occurs, each sensor unit becomes the main body. Assume that an abnormality (acceleration displacement) occurs in the # 3rd sensor unit as shown in (f). At this time, the # 3rd sensor unit transmits a signal including acceleration information, own ID, time stamp, and the like to the monitoring device 1. Since the signal from the # 3 sensor unit does not reach the monitoring apparatus 1 directly, it is transferred via the sensor unit in between. The signals from the # 3 sensor unit are sequentially received by the # 2 and # 1 sensor units and transferred to the monitoring device 1.
In this case, the signal transmitted from the # 3rd sensor unit also receives the # 4th or # 5th sensor unit, and further transfers it to other sensor units in the vicinity. The # 2 and # 3 sensor units also receive signals sent from the # 4 and # 5 sensor units (i.e., signals originally sent from the # 3 sensor unit). Since the # 3rd sensor unit has already transferred the signal sent from the # 3rd sensor unit to the other sensor units # 2 and # 1, the # 3 sensor unit does not perform the signal transfer operation.
On the other hand, the sensor units located downstream from the # 5 sensor unit transfer signals one after another, and continue until the terminal sensor unit transfers. That is, since the data is transferred to the end sensor unit, data is discarded.
When the signal from the # 3rd sensor unit arrives at the monitoring device 1, the monitoring device notifies the # 3rd sensor unit that the signal has been received, and the abnormality detection is completed.

As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, A various deformation | transformation can be implemented.
For example, the monitoring unit 101 and the display processing unit 102 have been described in two parts for convenience in order to explain the functions in an easy-to-understand manner, but these functions may be realized by the monitoring unit, for example.

  Further, the display management table shown in FIG. 13 is not necessarily in a single table format. For example, the display pattern of the display management table and its direction may be stored in association with the sensor unit ID of the rubber cone management DB shown in FIG. In this case, the monitoring unit 101 calculates not only the rubber cone determined to be abnormal but also the display patterns and directions of all the rubber cone sensor units, and stores them in the rubber cone management DB. Also good.

  As a modification of FIG. 10, the display pattern displayed on the display screen is not limited to the elliptical display pattern as shown in FIG. For example, the length of the arrow corresponding to the combined vector of binary X and Y and the direction of the arrow may be displayed.

  Moreover, in the said Example, the pattern displayed on a display screen was taken as one selected from P1-P5 of FIG. However, in a modification, in consideration of variation in displacement detected by the sensor unit, a plurality of display patterns P1 to P5 may be displayed instead of one display pattern. In this case, it is preferable that the display pattern of P1 is darkened and the color is gradually displayed lighter as P4 and P5.

  The terms and names used in the above embodiments are examples. The name of each part may sometimes be referred to by a different name. However, even in that case, the determination should be made in consideration of the gist of the present invention.

1: Monitoring device 10: Processor (CPU) 11: Wireless communication unit 12: Memory 13: Communication unit 14: Storage unit 15: Input unit 16: Display unit 17: Antenna 8: Network 9: Mobile terminal 101: Monitoring unit 102: Display processing unit 2: Rubber cone sensor unit 201: Processor 202: Memory 203: Acceleration sensor 204: Wireless communicator 205: Antenna 206: Battery 3: Rubber cone 301: Main body 302: Pedestal 304: Top 21: Container 22: Irradiation surface 23: Wearing part

Claims (7)

In a marker status monitoring system for monitoring the status of displacement of a plurality of markers arranged in a predetermined manner by a monitoring device,
A sensor unit mounted on the marker in a predetermined direction of two axes, the sensor unit being provided to an acceleration sensor that detects displacement of at least two axes of acceleration in the marker, and a self-sensor unit A memory for storing at least the unique ID, a means for adding the ID to information on the remaining battery level of the sensor unit and transmitting the information to the monitoring device according to an instruction from the monitoring device, and the acceleration sensor A processor having a means for adding the ID to the acceleration information detected by the transmitter and transmitting the information to the monitoring device; and information transferred from the monitoring device or another sensor unit. A wireless communicator that transfers to the monitoring device, and a battery that supplies power to these units,
The monitoring device includes information processing means, a storage unit, and a display,
The storage unit stores the ID of the sensor unit acquired from the plurality of sensor units in association with the arrangement of the plurality of sensor units, and includes acceleration information of the sensor unit corresponding to the ID. Keep a management DB that stores state information,
The indicator can display the acquired status information of the sensor unit on a screen,
The information processing means includes:
A process for issuing a command for monitoring the states of the plurality of sensor units and acquiring the state information of the sensor units, and acceleration information transmitted from the sensor units when the acceleration sensor detects an abnormal acceleration displacement First processing means for performing processing for acquiring
A display pattern corresponding to the magnitude of acceleration is created from the acquired acceleration information, and the display pattern is created by determining the display direction of the display pattern according to the direction of acceleration grasped from the acceleration information. Second processing means to
The display unit displays the display pattern created by the second processing unit in association with the ID of the sensor unit that has detected an abnormal acceleration displacement.
A sign monitoring system characterized by that. The management DB stores the state information including the remaining battery level of the sensor unit and the acceleration information acquired by the first processing unit in association with the ID of the sensor unit.
The status monitoring system for a sign according to claim 1. The first processing means further transmits a confirmation signal to the plurality of sensor units at the time of initialization processing of the plurality of sensor units, and each sensor unit determines the remaining battery level or radio wave intensity of its own sensor unit. Create a response signal with the ID added to the information shown and send it to the monitoring device;
The monitoring apparatus stores the obtained information on the remaining battery level of the sensor unit and the information on the radio wave intensity in the management DB in association with the ID.
3. The marker status monitoring system according to claim 1, wherein the marker status monitoring system according to claim 1 is used. Corresponding to the magnitude of the biaxial acceleration divided into a plurality of stages, a display pattern definition table defining a plurality of predetermined elliptical display patterns is stored in the storage unit,
The second processing means refers to the display pattern definition table, selects a display pattern corresponding to the magnitude of the biaxial acceleration of the acceleration information acquired from the sensor unit, and from the acceleration information A display pattern is created by rotating the display direction of the selected display pattern according to the grasped acceleration direction in the two axes.
The state monitoring system for a sign according to any one of claims 1 to 3. In a state monitoring method for a marker that monitors a displacement state of a plurality of markers arranged in a predetermined manner by a monitoring device,
The sensor unit includes an acceleration sensor that detects at least two-axis acceleration in the marker, a memory that stores at least a unique ID assigned to the sensor unit, and a battery of the sensor unit according to an instruction from the monitoring device. Means for adding the ID to the information on the remaining amount and transmitting the information to the monitoring device; and means for adding the ID to the information of the acceleration detected by the acceleration sensor and transmitting the information to the monitoring device. Having a processor, a wireless communication device for transferring information transferred from the monitoring device or another sensor unit to the other sensor unit or the monitoring device, and a battery for supplying power to these units. Attached to the marker in a predetermined direction,
The monitoring device stores the ID of the sensor unit acquired from the plurality of sensor units in association with the arrangement of the plurality of sensor units, and includes acceleration information of the sensor unit corresponding to the ID. Store state information in the management DB,
A process for issuing a command for monitoring the states of the plurality of sensor units and acquiring the state information of the sensor units, and acceleration information transmitted from the sensor units when the acceleration sensor detects an abnormal acceleration displacement The first process including the process of acquiring
Further, a display pattern corresponding to the magnitude of acceleration is created from the acquired acceleration information, and the display pattern is determined by determining the display direction of the display pattern according to the direction of acceleration grasped from the acceleration information. Do the second process to create,
When any of the markers is displaced, the display pattern created by the second process is displayed on the screen of the display unit in association with the ID of the sensor unit that has detected displacement of acceleration. A method for monitoring the state of a signage characterized by the above. The sensor unit is built in a sensor unit container having light emitting means for irradiating light emitted from the irradiation surface to the outside.
The sensor unit container is mounted on the top of the marker so that the irradiation surface of the light emitting means faces a direction directly opposite to the traveling direction of the vehicle and the irradiation surface faces one of two axes. 6. The method for monitoring the state of a sign according to claim 5. In the first process, confirmation signals are transmitted to a plurality of the sensor units, and each sensor unit creates an answer signal in which the ID is added to information indicating the remaining battery level or the radio wave intensity of the sensor unit. And transmit to the monitoring device,
7. The monitoring apparatus according to claim 5, wherein the monitoring device stores the obtained battery remaining amount information and radio wave intensity information in the management DB in association with the ID. The state monitoring method of the marking tool as described.

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