JP2019028752A - Theft detection system - Google Patents

Abstract

To quickly detect theft of goods such as packages to be transported, when occurred.SOLUTION: Radio waves from wireless tags (active tags) 32-1 to 32-3 mounted on an article are detected by receivers 30-1 to 30-3, and detected states and a current position are associated with each other to be transmitted from vehicle-mounted devices 10-1 to 10-3 to a server 43. The server 43 manages signals received from the vehicle-mounted devices 10-1 to 10-3 for each wireless tag, and regards it as a theft when a predetermined state is detected. After the vehicle starts running and stably detects the signals from the wireless tags, when the signals from the wireless tags are interrupted with the vehicle being stopped, or when a communication error is detected, it is regarded as occurrence of theft. Determination conditions are changed between the vicinity of a specific place such as a warehouse, factory, or delivery base, and other places for optimization, thereby preventing erroneous determination on theft. A user is notified of theft by means of a screen display or transmission of e-mail.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a theft detection system using a wireless tag and a vehicle-mounted device.

  For example, in the logistics departments of various companies, various articles are transported between factories, warehouses, distribution bases, and the like using vehicles. During such transportation, luggage may be lost due to mistakes in work. Also, luggage, transportation pallets, containers, etc. may be stolen during transportation or storage. In addition, the vehicle may be stolen.

  For example, Patent Document 1 discloses a technique for searching for lost items such as forgotten items. That is, a wireless tag that stores wireless tag information including tag identification information, wireless tag information, and requested search area information are registered as requested search information, and a lost property management server device that issues lost property information based on the requested search information And a plurality of portable terminal devices that have a function of receiving wireless tag information and a function of measuring the position of the wireless tag information, and performing a position search of the wireless tag based on the lost property information, the lost property management server device, Lost and found information is issued based on the registered request search area information.

  Further, Patent Document 2 shows an article location management system for realizing the location confirmation of a management target object with a simple procedure and for efficiently realizing a search when the management target object is lost. That is, an IC tag in which the management tag ID is recorded is attached to the management target. The terminal-side program is started by approaching the IC tag by the mobile terminal, the management tag ID and the terminal owner individual information of the mobile terminal are transmitted to the article location management server, and the management tag ID stored in advance and the terminal owner individual The location of the management object is confirmed by matching with the combination of information. Further, the terminal-side program periodically transmits the position information obtained from the self-position acquisition unit to the article location management server and accumulates it as management tag history information. When the management object is lost, the management tag history information accumulated is plotted on the map and released, thereby supporting the search for the management object.

JP 2005-3627 A Japanese Patent Laying-Open No. 2015-71492

  For example, when goods such as luggage, pallets for transportation, containers, etc. are transported by vehicle, the presence or absence of goods to be managed by the operator is generally only at specific points such as factories, warehouses, and delivery bases. Confirmation work is carried out for each vehicle. Therefore, when some articles are stolen during transportation, there is a high possibility that it takes time until the manager notices theft after the theft occurs. In addition, since the location where theft actually occurred cannot be specified, it was difficult to find the stolen article.

  In addition, in the above cases, it is impossible to correctly distinguish a situation in which an article has been lost due to a mistake in work such as loading and unloading the article from a vehicle and a situation in which the article has actually been stolen. It was.

  For example, if a wireless tag or the like is attached to each article, it is possible to individually manage the presence or absence of each article. However, it is difficult to distinguish between a change due to regular movement of each article and a change due to theft. For example, in a large factory, there is a possibility that each article will move greatly even if it is not stolen. In addition, even if a certain amount of time has passed since the transportation vehicle started to move, the vehicle and the goods may remain in the same place for a while if there is a special situation such as road congestion. . On the other hand, if the vehicle transporting the goods is temporarily stopped on a general road or parking lot for a break in the middle of transportation, there is a possibility of theft even if the goods move slightly Conceivable.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a theft detection system capable of quickly detecting an article theft when it occurs.

In order to achieve the above-described object, the theft detection system according to the present invention is characterized by the following (1) to (4).
(1) Onboard equipment mounted on a vehicle;
A server that is outside the vehicle and has a function of detecting theft of an article to which a wireless tag is attached,
The in-vehicle device is
A radio signal receiving unit for receiving a radio signal from the radio tag;
A position information acquisition unit for acquiring information indicating the current position of the vehicle;
A wireless signal transmitter for transmitting a wireless signal to the server;
A transmission control unit that associates the content of the radio signal from each radio tag received by the radio signal reception unit with the current location acquired by the location information acquisition unit, and transmits the content to the server using the radio signal transmission unit; With
The server detects the theft of the article based on a signal received from the vehicle-mounted device;
Theft detection system characterized by that.

  According to the theft detection system having the configuration (1), the server can detect the theft of the article based on a signal received from the vehicle-mounted device. That is, when the article to be monitored moves to a position far from the vehicle and the vehicle-mounted device due to theft, the vehicle-mounted device cannot receive radio waves attached to the article, or the radio wave is weakened or the distance is increased. Since it detects that it has left, it can detect theft. In addition, since the information on the current position of the vehicle-mounted device when the theft occurs can be obtained, the server can easily identify the place where the theft occurred.

(2) When the server on which the vehicle-mounted device is mounted is stopped and the server detects an abnormality in the reception state of the wireless signal from the wireless tag in the vehicle-mounted device, An article management unit that recognizes that the article associated with the tag has been stolen;
The theft detection system according to (1) above, wherein

  According to the theft detection system having the configuration of (2) above, when the vehicle is likely to be stolen, the abnormal detection of the reception state of the wireless signal from the wireless tag is detected when the vehicle is stopped. Can detect theft. For example, when a vehicle starts traveling without loading an article due to a mistake in loading work, it is highly possible that an abnormality will be detected during traveling, so that it can be recognized that it is not theft.

(3) The server includes a destination information acquisition unit that acquires one or more destination information indicating a storage location or a destination base of an article associated with the wireless tag,
The article management unit is configured to determine whether the current position acquired from the on-vehicle device is the storage location or the base based on the determination condition for identifying whether or not the reception state of the wireless signal from the wireless tag in the on-vehicle device is abnormal. Automatically changes depending on whether it is in the vicinity of
The theft detection system according to (2) above, wherein

  According to the theft detection system having the configuration (3), the determination condition for the article management unit to identify the theft can be optimized according to the situation, so that the determination accuracy is improved. That is, in the vicinity of the storage location or the base, there is a possibility that the article moves in a relatively wide range with a regular work or the like even if it is not stolen. On the other hand, in a situation where the vehicle is stopped on a road or in a general parking lot, it is possible to regard the article as being stolen just by moving away from the vehicle. By switching the determination conditions according to such a difference in situation, it is possible to eliminate determination errors and to quickly detect theft.

(4) The article management unit determines the radio tag when a state in which a signal from the same radio tag is continuously received satisfies a predetermined condition after the corresponding vehicle starts traveling. It is regarded as a tag, and only the confirmed tag is subject to theft management.
The theft detection system as described in said (2) or (3) characterized by the above-mentioned.

  According to the theft detection system having the above configuration (4), it is possible to manage theft in a stable state after the vehicle starts to transport the article. Further, for example, if a wireless tag that has been dropped from an article and lost during transportation is excluded from the confirmed tag, it is possible to prevent the theft from being erroneously determined.

  According to the theft detection system of the present invention, when an article is stolen, it can be detected quickly. In other words, if the article to be monitored moves to a position far from the vehicle and the vehicle-mounted device due to theft, the vehicle-mounted device may not be able to receive the radio wave of the wireless tag attached to the item, or the radio wave will be weakened or the distance will increase. Since this is detected, the server can detect theft based on the detection result of the vehicle-mounted device. Moreover, since the information on the current position of the vehicle-mounted device when the theft occurs can be obtained, the server can easily identify the place where the theft occurred.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a block diagram illustrating a configuration example of the vehicle-mounted device according to the embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration example of the theft detection system according to the embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a configuration example of a database used by the server of the theft detection system. FIG. 4 is a flowchart illustrating an operation example of the vehicle-mounted device according to the embodiment of the present invention. FIG. 5 is a flowchart showing an example of the confirmation tag process executed by the server in the embodiment of the present invention. FIG. 6 is a flowchart illustrating an example of theft determination processing executed by the server in the embodiment of the present invention. FIG. 7 is a flowchart showing a modification of the theft determination process shown in FIG. FIG. 8 is a flowchart showing the operation of the server when receiving a tag signal and the operation of the server when searching for a tag. FIG. 9 is a plan view illustrating an example of a positional relationship between a vehicle on which the vehicle-mounted device is mounted, a communicable range, and a wireless tag.

  Specific embodiments relating to the present invention will be described below with reference to the drawings.

<Configuration example of OBE>
The structural example of the onboard equipment 10 in embodiment of this invention is shown in FIG. The vehicle-mounted device 10 is used in a state in which the vehicle-mounted device 10 is mounted on the vehicle in order to manage various packages carried on the vehicle such as a truck. The vehicle-mounted device 10 is assumed to be configured as a dedicated vehicle-mounted device for managing luggage or as a part of a general vehicle-mounted device such as a digital tachograph.

  1 includes a microcomputer (CPU) 11, a speed signal interface 12, an engine signal interface 13, a GPS interface 14, an analog signal interface 15, an external input interface 16, a tag signal interface 17, and a wide area wireless communication module. 18, an antenna 19, a nonvolatile memory 20, a volatile memory 21, an SD card 22, a switch input unit 23, and a liquid crystal display unit (LCD) 24.

  The microcomputer 11 implements various functions required for the vehicle-mounted device 10 by executing a program incorporated in advance. The main operation of the microcomputer 11 will be described later.

  The speed signal interface 12 converts a predetermined vehicle speed signal SG1 output from the vehicle side into a signal suitable for input processing of the microcomputer 11. The microcomputer 11 can grasp the travel speed and travel distance of the vehicle by monitoring the number of pulses of the vehicle speed signal SG1 and the signal cycle.

  The engine signal interface 13 converts a predetermined engine rotation signal SG2 output from the vehicle side into a signal suitable for input processing of the microcomputer 11. The microcomputer 11 can grasp the rotation speed (rpm) of the engine by monitoring the number of pulses of the engine rotation signal SG2 and the signal cycle.

  The GPS interface 14 is used to input a signal SG3 from a GPS receiver (not shown) to the microcomputer 11. The GPS receiver can receive radio waves from a plurality of GPS (Global Positioning System) satellites and calculate the current position of the vehicle as a reception point. The microcomputer 11 can acquire information on the current position from the GPS receiver via the GPS interface 14.

  The analog signal interface 15 can convert the analog signal SG4 representing the temperature in the luggage compartment of the vehicle into a digital signal and give it to the microcomputer 11. Therefore, the microcomputer 11 can manage the temperature of each package.

  The external input interface 16 converts a predetermined external signal SG5 into a signal suitable for input processing of the microcomputer 11. For example, a signal indicating the magnitude of acceleration applied to the vehicle can be input to the external input interface 16 as the external signal SG5.

  The tag signal interface 17 is used to connect the receiver 30 to the input of the microcomputer 11. The receiver 30 has a function of receiving a radio signal from a radio tag 32 described later. In addition, the receiver 30 may be connected to the outside of the vehicle-mounted device 10 as shown in FIG.

  The wide area wireless communication module 18 has a function for securing a wireless communication line with a wireless base station 41 provided by a mobile communication provider or the like and enabling wide area wireless communication, for example. The wide area wireless communication module 18 can communicate with the wireless base station 41 via the antenna 19.

  The non-volatile memory 20 is an electronic device such as a flash memory that can read and rewrite data held by the microcomputer 11. The non-volatile memory 20 is used to hold various parameters, constant data, programs, and other data used by the vehicle-mounted device 10.

  The volatile memory 21 is a semiconductor memory device that can freely read and write data by accessing the microcomputer 11. The volatile memory 21 is used to temporarily hold various data handled by the microcomputer 11.

  The SD card 22 is detachably connected to the vehicle-mounted device 10 using a predetermined card interface (not shown). The SD card 22 is used to store various data to be recorded by the vehicle-mounted device 10 such as vehicle operation data.

  The switch input unit 23 includes a switch that generates signals representing operation states of a plurality of buttons for accepting an input operation of a user such as a vehicle driver. A signal indicating the operation state of each button is input from the switch input unit 23 to the microcomputer 11.

  The liquid crystal display unit 24 is disposed at a position on the front surface of the housing of the vehicle-mounted device 10 that is easy to see from the driver. Used to display necessary information.

<Configuration example of theft detection system>
A configuration example of the theft detection system in the embodiment of the present invention is shown in FIG. In the example illustrated in FIG. 2, wireless tags 32-1, 32-2, and 32-3 are attached to a plurality of packages 31-1, 31-2, and 31-3, respectively.

  Note that this system can also be used to detect theft of the vehicle itself, not limited to luggage. When detecting theft of the vehicle, at least one wireless tag 32 is attached on the vehicle.

  Here, each of the wireless tags 32-1 to 32-3 is an active tag. That is, each tag has a built-in battery, periodically emits radio waves with its own power, and transmits tag information. It is also possible to connect a sensor to each tag and transmit information detected by the sensor from the tag. As a specific example, each of the wireless tags 32-1 to 32-3 periodically transmits information including its own ID as a wireless signal every minute.

  For example, a radio signal is transmitted using a frequency band of 920 [MHz]. In that case, for example, the radio waves of the wireless tags 32-1 to 32-3 reach a position separated by about 300 [m]. Of course, other frequency bands may be used.

  In the example shown in FIG. 2, the receiver 30-1 is connected to the vehicle-mounted device 10-1, the receiver 30-2 is connected to the vehicle-mounted device 10-2, and the receiver 30-3 is connected to the vehicle-mounted device 10-3. Yes. The vehicle-mounted device 10-1 and the receiver 30-1 are mounted on one vehicle 33, and the receiver 30-1 is arranged so as to receive radio waves from the wireless tag 32-1 arranged in the luggage compartment of the vehicle 33. . Similarly, the vehicle-mounted device 10-2 and the receiver 30-2 are used in a state of being mounted on another vehicle. The vehicle-mounted device 10-3 and the receiver 30-3 are also used in a state of being mounted on another vehicle.

  Each of the receivers 30-1 to 30-3 is equipped with a reception function for receiving radio waves of the wireless tags 32-1 to 32-3 and acquiring information such as an ID from a reception signal. In the present embodiment, the receivers 30-1 to 30-3 do not have a transmission function.

  Note that the wireless tags 32-1 to 32-3 are used for purposes other than tags such as the frequency band of 920 [MHz] (for example, energy management systems (EMS) such as MEMS and HEMS). When using the same frequency as the communication), the receivers 30-1 to 30-3 have a function of discarding the received signals other than the tag from the received signals in order to avoid the problem of privacy. It may be allowed.

  In the example shown in FIG. 2, it is assumed that the packages 31-1, 31-2, and 31-3 are general packages, empty packages (transport pallets), and containers handled by the same shipping company. ing. As described above, even if the various types of packages 31-1 to 31-3 are different from each other, the wireless tags 32-1 to 32-3, the receivers 30-1 to 30-3, and the vehicle-mounted devices 10-1 to 10-10. By sharing the communication specification of -3, it can be handled by a common system.

  For example, when the luggage 31-1 mounted on the same vehicle as the vehicle-mounted device 10-2 is stolen, the vehicle-mounted device 10-1 mounted on another vehicle for the purpose of searching for the luggage 31-1, It is also possible to use 10-3.

  A server 43 included in the theft detection system shown in FIG. 2 is connected to the radio base station 41 via the Internet network 42. User terminals 44 and 45 are connected to the server 43. As each of the user terminals 44 and 45, for example, a personal computer (PC) managed by the same company or user is assumed.

  Each of the vehicle-mounted devices 10-1 to 10-3 mounted on different vehicles 33 receives the radio signals of the wireless tags 32-1 to 32-3 existing within a predetermined area range from the receivers 30-1 to 30-. By receiving in step 3, the ID number of the corresponding tag can be acquired. Further, each of the vehicle-mounted devices 10-1 to 10-3 secures a wireless communication line with the wireless base station 41 by wide-area wireless communication, and transmits the detected tag ID number and the like to the server 43. Information transmitted by each of the vehicle-mounted devices 10-1 to 10-3 reaches the server 43 via the radio base station 41 and the Internet network 42.

  Further, as will be described later, each of the vehicle-mounted devices 10-1 to 10-3 acquires information on the current position of the host vehicle, links the position information to the ID number of the detected tag, and transmits the information to the server 43. To do. Also, information indicating the reception status of radio waves from each tag is transmitted. Therefore, the server 43 can grasp the presence / absence of detection of each wireless tag 32-1 to 32-3, the size of the distance between each tag and the vehicle-mounted device, and the current position of each vehicle-mounted device.

  The server 43 can automatically detect theft of a managed package and the like, and can display an alarm on the screen of the corresponding user terminal 44 or 45 or notify it by e-mail. Further, a user such as a company can access the server 43 through the user terminal 44 or 45 and perform a search for finding a stolen package. Details will be described later.

<Configuration example of database used by server 43>
A configuration example of a database used by the server 43 of the package management system is shown in FIG. That is, the computer in the server 43 uses various information existing in the tag database DB1, the vehicle database DB2, the determination condition database DB3, etc. shown in FIG.

  The tag database DB1 is a database for individually managing information associated with each of a large number of tags for each tag. The tag database DB1 shown in FIG. 3 includes, as management items, a recognition number (ID number of the tag), analog information (such as temperature), acceleration information, status information, and destination information.

  The status information in the tag database DB1 is information indicating the state of the baggage attached with the tag, and specifically, waiting in a depot (warehouse or delivery base), delayed delivery, misdelivery, delivery, completion of delivery, etc. There is a state of. The status information also includes information indicating whether or not a “determined tag”, which will be described later, and information indicating whether a package is lost or stolen.

  The destination information in the tag database DB1 includes information on the destination of the baggage attached with the tag (a location such as a warehouse, a delivery base, a relay point, etc.) and the time at which the destination should be reached. The contents of the tag database DB1 are sequentially updated under the control of the server 43 in accordance with the actual state change of each corresponding tag.

  The vehicle database DB2 is a database for managing each vehicle on which the vehicle-mounted device 10 is mounted. The vehicle database DB2 shown in FIG. 3 includes traveling speed, engine rotation speed, and GPS data (current position of the vehicle) as management items.

  In addition, although it can acquire based on the GPS data in vehicle database DB2 about each tag and the present position of the package which attached it, you may manage the information of the current position for every tag by tag database DB1. The contents of the vehicle database DB2 are sequentially updated under the control of the server 43 as the state of the vehicle changes.

  The determination condition database DB3 is information used when the server 43 determines the state of each tag and the package attached thereto. In the determination condition database DB3 shown in FIG. 3, information such as time, place, and distance is registered in advance as determination conditions.

<Description of operation>
<Operation example of the vehicle-mounted device 10>
FIG. 4 shows an operation example of the vehicle-mounted device 10 in the embodiment of the present invention. That is, the microcomputer 11 in the vehicle-mounted device 10 shown in FIG. 1 executes the operation shown in FIG. The operation of FIG. 4 will be described below.

  As shown in FIG. 5, the receiver 30 mounted on each vehicle 33 and the wireless tag 32 detected by the vehicle-mounted device 10 are a tag (32−) attached to a load (31-1) loaded in the luggage compartment of the vehicle 33. 1) or a tag (32-2) that does not exist in the cargo compartment but exists within a range in which the radio waves of the tag can be received.

  The microcomputer 11 monitors the signal output from the receiver 30 connected to the input of the vehicle-mounted device 10 and identifies whether or not the receiver 30 has received a wireless signal from any wireless tag 32 in S11. If the radio signal is received, the process proceeds to S12.

  In step S <b> 12, the microcomputer 11 acquires the ID number information of the wireless tag 32 included in the signal received by the receiver 30 from the receiver 30 via the tag signal interface 17.

  In step S <b> 13, the microcomputer 11 acquires information on the current position (latitude / longitude of the reception point or the vehicle position) calculated by a GPS receiver (not shown) via the GPS interface 14.

  In step S14, the microcomputer 11 associates the ID number information of the wireless tag 32 acquired in S12, the current position information acquired in S13, and the information indicating the radio wave reception state in the receiver 30 with each other. These pieces of information are transmitted to the server 43 via the wide area wireless communication module 18.

  The radio wave reception state at the receiver 30 is assumed to be radio wave reception intensity, but may be replaced with distance information when the distance to the radio tag 32 can be detected. Further, for example, the vehicle-mounted device 10 may transmit information indicating the traveling speed, traveling distance, and the like of the host vehicle to the server 43 simultaneously in S14.

  Accordingly, the server 43 periodically receives the ID number of each wireless tag 32 detected by the receiver 30 connected to the vehicle-mounted device 10 mounted on each vehicle in a state in which the current position is associated with each other. can do. Further, the server 43 can also grasp the difference in distance between each on-vehicle device 10 and the wireless tag 32.

<Description of fixed tag processing>
FIG. 5 shows an example of “confirmation tag processing” executed by the server 43 in the embodiment of the present invention. This process is periodically executed as needed by the computer in the server 43. The contents of the “confirmation tag process” shown in FIG. 5 will be described below.

  In step S <b> 21, the computer in the server 43 performs input processing on a message transmitted from any one of the vehicle-mounted devices 10 and acquires necessary information. That is, in addition to the ID number and position information of the tag transmitted by the vehicle-mounted device 10 in S14 of FIG. 4, the ID number that identifies the vehicle-mounted device 10 that is the transmission source and the state of the vehicle that is the transmission source (travel speed, travel distance) Get such information.

  In step S22, the computer in the server 43 identifies whether or not the vehicle on which the vehicle-mounted device 10 that is the transmission source of the message processed in S21 is running, and if it is running, proceeds to the next processing in S23.

  In step S23, the computer in the server 43 repeats a message representing the same wireless tag 32 within a predetermined time (for example, 5 minutes) by monitoring the ID numbers of the tags included in the plurality of messages processed in S21. Identifies whether or not it has been received. If it has been received repeatedly, the process proceeds to the next S24. That is, if the in-vehicle device 10 of the transmission source and the server 43 are continuously detecting the presence of the same wireless tag 32, that is, the same luggage 31, the processing of the server 43 proceeds to S24.

  In step S24, the computer in the server 43 determines in advance the determination condition for determining whether or not the wireless tag 32 detected in S23 is a “determined tag”, and the actual detection state of the wireless tag 32 to be processed. And compare. Constant data representing the determination condition is held in the determination condition database DB3 shown in FIG. Specifically, the length of time during which the state of detecting the same wireless tag 32 continues, the length of the mileage of the vehicle in this continuous state, the location (position) where the corresponding wireless tag 32 is detected Are compared with the determination conditions defined by the constant data in the determination condition database DB3 in S24.

  When the wireless tag 32 detected in S23 satisfies the determination condition in S24, the process proceeds to the next S24, and the computer in the server 43 stores the status information (in the tag database DB1) of the wireless tag 32 detected in S23. , A flag indicating the state of “definite tag” is set.

  When the server 43 executes the “determined tag process” shown in FIG. 5, the wireless tags 32 that are continuously detected in a stable state can be selected as “determined tags”. Note that the wireless tag 32 that has become a “determined tag” is excluded from the “determined tag” when a predetermined condition is satisfied, such as when a predetermined time has elapsed since the completion of delivery.

  Further, after the wireless tag 32 is recognized as a “determined tag”, if the detection state becomes unstable or an abnormality occurs, it is recognized as “theft”. In order to detect the “theft”, the server 43 executes a “theft determination process” to be described later.

<Description of theft determination processing>
<Operation example 1>
An example of “theft determination processing” executed by the server 43 in the embodiment of the present invention is shown in FIG. This process is periodically executed by the computer in the server 43 every fixed time (for example, 5 minutes) for each tag. The contents of the “theft determination process” shown in FIG. 6 will be described below.

  In step S <b> 31, the computer in the server 43 refers to the status information for each wireless tag 32 managed on the tag database DB <b> 1 that can be referred to by the server 43, and identifies whether it is a “determined tag”. For the “determined tag”, the process of the next S32 is executed.

  In step S <b> 32, the computer in the server 43 identifies whether or not the communication with the wireless tag 32 detected as the “determined tag” in S <b> 31 is interrupted while the vehicle is stopped. When detecting that communication from the vehicle-mounted device 10 representing the signal of the corresponding “determined tag” has been interrupted, the server 43 executes the next S33.

  In step S33, the computer in the server 43 sets an allowable time (for example, 10 minutes) that predetermines the length of time that the communication interruption state continues for the “determined tag” in which the communication interruption is detected in S32. Compare. The constant data of the allowable time is stored in advance in the determination condition database DB3, for example. If the duration of the communication interruption state exceeds the allowable time, the process proceeds to the next step S34.

  In step S <b> 34, the computer in the server 43 outputs a package theft alarm for the corresponding “determined tag”. Specifically, the theft information indicating that the package 31 attached to the corresponding “determined tag” has been stolen with respect to the screen of the user terminal 44 or 45 accessing the Web screen provided by the server 43. Is displayed. Further, an alarm mail including a message indicating that the corresponding package 31 has been stolen is automatically transmitted to an e-mail address of a mobile terminal or the like registered in advance for the corresponding tag.

<Operation example 2>
FIG. 7 shows a modified example of the “theft determination process” executed by the server 43 in the embodiment of the present invention. This process is periodically executed by the computer in the server 43 every fixed time (for example, 5 minutes) for each tag. The contents of the “theft determination process” shown in FIG. 7 will be described below.

  In step S <b> 41, the computer in the server 43 refers to the status information for each wireless tag 32 managed on the tag database DB <b> 1 that can be referred to by the server 43, and identifies whether it is a “determined tag”. For the “determined tag”, the process of the next S42 is executed.

  In step S42, the computer in the server 43 acquires the destination information of the corresponding tag from the tag database DB1 for the “determined tag” to be processed.

  The destination information on the tag database DB1 is used together with the ID number of the wireless tag 32 when creating a schedule of the delivery destination, delivery time, delivery route, etc. for each package to be delivered or when updating the schedule. It can be determined and registered in the tag database DB1. This destination information includes time information of expected arrival in addition to the position information of the corresponding delivery base.

  In step S43, the computer in the server 43 acquires information on the current position of the corresponding tag from the tag database DB1 or the vehicle database DB2 for the “determined tag” to be processed.

  In step S44, the computer in the server 43 compares, for example, the destination range acquired in S42 with the current position acquired in S43 for the “determined tag” to be processed, and whether the current position is within the destination range. Identify whether or not. Note that the determination condition of S44 may be determined in consideration of time information in addition to position information. This determination condition is held on the determination condition database DB3, for example.

  For the “determined tag” that is detected to be within the destination range in S44, in the next S45, the computer in the server 43 obtains information about the determination condition dedicated to the destination from the determination condition database DB3. To do.

For example, the determination condition information includes the following constant data corresponding to a threshold for detecting a communication abnormality corresponding to the occurrence of theft.
(1) A threshold value for determining that the reception level when the receiver 30 receives radio waves from the corresponding wireless tag 32 due to the single movement of the luggage 31 accompanying theft is abnormally lowered.
(2) A threshold value for determining that the distance between the wireless tag 32 and the receiver 30 is abnormally separated.
(3) A threshold value for determining the length of time during which the abnormal state continues.

  For the “determined tag” that is detected to be out of the destination range in S44, in S46, the computer in the server 43 obtains information indicating normal determination conditions other than the destination from the determination condition database DB3. get.

  There is a large difference between the determination condition acquired by the server 43 in S45 and the determination condition acquired in S46. For example, in a factory, warehouse, delivery base, etc. of the same company, even if theft does not occur, there is a possibility that the baggage may move within a certain range due to regular work or the like. On the other hand, if the vehicle stops on the road during delivery, or if it stops at a general parking lot, etc., there is a possibility of theft even if the distance between the baggage and the vehicle is a little away. high. Therefore, by appropriately switching the determination conditions to be used according to the situation and position of the vehicle, it is possible to prevent erroneous theft determination or realize quick theft determination.

  In step S47, the computer in the server 43 determines that the communication abnormality (theft) of the corresponding wireless tag 32 has been acquired in S45 or S46 in a state where the vehicle on which the corresponding onboard device 10 and the receiver 30 are mounted is stopped. It is identified whether it detected based on conditions. If the communication is abnormal, the next step S48 is executed.

  In step S48, the computer in the server 43 compares the length of time during which the communication abnormality detected in S47 continues with a threshold value. Then, when the duration of the communication abnormality is outside the allowable range, the next step S49 is executed.

  In step S49, the computer in the server 43 outputs a package theft alarm as in the above-described S34.

<Operation to search for stolen luggage>
FIG. 8 shows the operation of the server when receiving a tag signal and the operation of the server when searching for a tag. Moreover, the example of the positional relationship of the vehicle carrying the onboard equipment 10, the communicable range, and a wireless tag is shown in FIG.

  As shown in FIG. 9, assuming that the vehicle-mounted device 10 and the receiver 30 are mounted on the vehicles 33-1 and 33-2 traveling on the road, respectively, the vehicles 33-1 and 33-2. Each receiver 30 can receive the radio wave of each wireless tag 32 in a roaming area that is a circular area having a predetermined radius (for example, about one hundred to several hundreds [m]) around the center.

  Therefore, the vehicle-mounted device 10 and the receiver 30 mounted on each of the vehicles 33-1 and 33-2 are mounted not only on the normal baggage loaded in the cargo compartment of the own vehicle but also on other vehicles that are stolen. In some cases, a baggage that has been placed or a baggage that is placed on the ground (with a wireless tag 32 attached) is accidentally discovered while the host vehicle is traveling. In particular, when a company or the like owns a large number of vehicles, there is a possibility that one of the vehicles accidentally finds a stolen luggage during the operation of these vehicles. It is also possible to find not only the stolen luggage but also other vehicles stolen with the in-vehicle device 10 removed (when the wireless tag 32 is attached), for example.

  And the onboard equipment 10 transmits the information of the discovered wireless tag 32 with respect to the server 43 (S14 of FIG. 4). In step S51 in FIG. 8, the server 43 performs input processing on the message transmitted from the vehicle-mounted device 10 and acquires necessary information. That is, the server 43 acquires the ID number, position information, and the like of the corresponding wireless tag 32. And the server 43 preserve | saves the information of the acquired wireless tag 32 in tag database DB1 etc. by S52.

  On the other hand, a company managing the server 43 can use the server 43 to provide a Web service for searching for lost packages to each company or user using the theft detection system. In that case, each company or user uses the user terminals 44 and 45 to access the Web screen of the server 43 and receives provision of relevant information.

  When each company or user inputs the tag ID number of the wireless tag 32 attached to the package to be searched from the user terminals 44 and 45, the tag ID number is input to the computer of the server 43 in S61 shown in FIG.

  In step S62, the computer of the server 43 searches the tag database DB1 based on the tag ID number input in S61. That is, it is identified whether or not the specific wireless tag 32 corresponding to the tag ID number input in S61 has been detected (even temporarily) on the tag database DB1 after the theft detection. If the corresponding specific wireless tag 32 is in the detected state on the tag database DB1, the process proceeds from S63 to S64, and the computer of the server 43 sends a request to the requesting user terminal 44 or 45. , S62 is notified of the search result.

<Advantages of theft detection system>
In the theft detection system shown in FIG. 2, since the server 43 grasps the state of each wireless tag 32 individually in the tag database DB1 based on information transmitted from each vehicle-mounted device 10, and manages it in almost real time. When the package 31 being transported is stolen, it can be quickly detected that the theft has occurred before the vehicle arrives at the destination. Moreover, since each onboard equipment 10 transmits position information, the server 43 can pinpoint the position of the place where theft occurred.

  When the theft determination process shown in FIG. 7 is executed, the server 43 selects an appropriate determination condition in S45, S46, etc. depending on the state of the vehicle carrying the load and the difference in location. False detection can be reduced and determination accuracy can be improved. For example, immediately after the vehicle carrying the baggage leaves the factory, even if the factory site is large and it takes time to get out of the site, or even if it passes through a place where traffic congestion is likely to occur, The determination condition can be switched in consideration of the situation of theft, so that the erroneous determination of theft can be reduced. Further, by making only the “determined tag” detected by the processing shown in FIG. 5 to be monitored for theft, false detection of theft can be prevented. For example, when a radio wave is accidentally detected from a wireless tag 32 attached to a package that is completely unrelated to delivery, it is possible to avoid theft determination processing being erroneously executed.

Here, the features of the theft detection system according to the embodiment of the present invention described above are briefly summarized and listed in the following [1] to [4], respectively.
[1] On-vehicle device (10) mounted on a vehicle;
A server (43) that has a function of detecting theft of an article that is outside the vehicle and is equipped with a wireless tag (32);
The in-vehicle device is
A radio signal receiver (receiver 30) for receiving a radio signal from the radio tag;
A position information acquisition unit (GPS interface 14) for acquiring information representing the current position of the vehicle;
A wireless signal transmission unit (wide area wireless communication module 18) that transmits a wireless signal to the server;
A transmission control unit that associates the content of the radio signal from each radio tag received by the radio signal reception unit with the current location acquired by the location information acquisition unit and transmits the content to the server using the radio signal transmission unit ( A microcomputer 11, S14),
The server detects the theft of the article based on a signal received from the vehicle-mounted device (S34, S49),
Theft detection system characterized by that.

[2] The server detects an abnormality in the reception state of the wireless signal from the wireless tag in the onboard device (S32, S33, S47, while the vehicle on which the onboard device is mounted is stopped (S32). S48) having an article management unit (S34, S49) for recognizing that the wireless tag or the article associated with the wireless tag has been stolen.
The theft detection system according to [1] above, wherein

[3] The server includes a destination information acquisition unit (S42) that acquires one or more destination information representing a storage location or a destination base of an article associated with the wireless tag,
The article management unit is configured to determine whether the current position acquired from the on-vehicle device is the storage location or the base based on the determination condition for identifying whether or not the reception state of the wireless signal from the wireless tag in the on-vehicle device is abnormal. Automatically change depending on whether or not it is near (S44 to S46),
The theft detection system according to [2] above, wherein

[4] The article management unit determines the wireless tag when a state in which a signal from the same wireless tag is continuously received satisfies a predetermined condition after the corresponding vehicle starts traveling. It is regarded as a tag (see FIG. 5), and only the confirmed tag is subject to theft management (S31, S41).
The theft detection system according to the above [2] or [3].

10, 10-1, 10-2, 10-3 On-vehicle equipment 11 Microcomputer 12 Speed signal interface 13 Engine signal interface 14 GPS interface 15 Analog signal interface 16 External input interface 17 Tag signal interface 18 Wide area wireless communication module 19 Antenna 20 Non-volatile Memory 21 Volatile memory 22 SD card 23 Switch input unit 24 Liquid crystal display unit 30, 30-1, 30-2, 30-3 Receiver 31, 31-1, 31-2, 31-3 Luggage 32, 32-1, 32 -2, 32-3 Radio tag 33 Vehicle 41 Radio base station 42 Internet network 43 Server 44, 45 User terminal A1, A2 Communicable range DB1 Tag database DB2 Vehicle database DB3 Judgment condition database

Claims (4)

A vehicle-mounted device mounted on the vehicle;
A server that is outside the vehicle and has a function of detecting theft of an article to which a wireless tag is attached,
The in-vehicle device is
A radio signal receiving unit for receiving a radio signal from the radio tag;
A position information acquisition unit for acquiring information indicating the current position of the vehicle;
A wireless signal transmitter for transmitting a wireless signal to the server;
A transmission control unit that associates the content of the radio signal from each radio tag received by the radio signal reception unit with the current location acquired by the location information acquisition unit, and transmits the content to the server using the radio signal transmission unit; With
The server detects the theft of the article based on a signal received from the vehicle-mounted device;
Theft detection system characterized by that. The server responds to the wireless tag or the wireless tag when detecting an abnormal reception state of a wireless signal from the wireless tag in the onboard device in a state where the vehicle on which the onboard device is mounted is stopped. An article management unit that recognizes that the attached article has been stolen;
The theft detection system according to claim 1. The server has a destination information acquisition unit that acquires one or more destination information representing a storage location or a destination base of an article associated with the wireless tag,
The article management unit is configured to determine whether the current position acquired from the on-vehicle device is the storage location or the base based on the determination condition for identifying whether or not the reception state of the wireless signal from the wireless tag in the on-vehicle device is abnormal. Automatically changes depending on whether it is in the vicinity of
The theft detection system according to claim 2 characterized by things. The article management unit regards the wireless tag as a definite tag when a state in which a signal from the same wireless tag is continuously received satisfies a predetermined condition after the corresponding vehicle starts traveling. , Only the confirmed tag is subject to theft management,
The theft detection system of Claim 2 or Claim 3 characterized by the above-mentioned.

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