JP2016115360A - Entrance detecting apparatus, and entrance detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an entrance detecting apparatus and an entrance detecting system.SOLUTION: An entrance detecting apparatus is equipped with a detector that detects, on the basis of communication with each of truck communicators arranged in multiple positions of a truck and an external communicator outside the truck, whether or not the truck has done an unloading action to discharge its cargo; and an intensity relation identifier that identifies the reception intensity relation of each of the truck communicators in communication between each of the truck communicators and the external communicator. The detector detects whether or not the truck has done the action to discharge its cargo on the basis of the level of similarity between the reception intensity relations identified by the intensity relation identifier and a prescribed reception intensity relation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an entry detection device and an entry detection system.

  Recently, transportation work of goods using vehicles is widely performed. This transport operation generally includes loading, transporting, and unloading operations. For example, in the cement industry, crushed stones such as limestone mined at a mining site are loaded onto a large truck, the large truck transports the crushed stone to an unloading site, and unloads the crushed stone to an unloading site.

JP 2010-280336 A

  In order to centrally manage the unloading situation in such a transportation business, it is conceivable to use an RFID (Radio Frequency IDentification) tag. Specifically, a method is conceivable in which one RFID tag is installed in a vehicle and the approach of the vehicle to the unloading site is detected by analyzing the received intensity measurement value of the RFID tag. Note that a vehicle approach detection system using a vehicle in which an RFID tag is installed is disclosed in, for example, patent literature.

  However, the above method has some problems described below.

  First, depending on the field environment, it is difficult to accurately measure the received intensity due to the influence of radio wave reflection and the like. In addition, since the reception intensity of radio waves is easily affected by the weather, the reception intensity can vary from day to day. As described above, since the reception intensity of the RFID tag is low in reliability, it is difficult to accurately detect the vehicle entry by analyzing the reception intensity of one RFID tag.

  In particular, the unloading site of the mine is in an environment that is directly affected by the weather because it is outdoors. In addition, since the mine itself is a huge crater type, when it rains, fog and hail that affect radio wave propagation are generated. In addition, the surrounding metal environment changes frequently due to the addition and movement of metal unloading equipment and trucks. For this reason, it is very difficult to accurately detect the approach of the vehicle by analyzing the reception intensity of one RFID tag at the unloading site of the mine.

  Secondly, it is difficult to distinguish between approach and approach by analyzing the reception intensity of one RFID tag. For example, if the truck that passes in the vicinity of the unloading station and the approaching form of the truck to be unloaded to the unloading station are similar, the change in the reception intensity of the RFID tag is also similar, so the entry and the passing (approach) are distinguished It is difficult to do.

  Third, if there is only one RFID tag installed in the vehicle, the system will not function if the RFID tag is damaged / lost. In particular, trucks that carry crushed stones include roads that are not paved in the transportation route, and thus generate large vibrations during transportation. The truck repeatedly loads and unloads large crushed stones. For this reason, there is a high possibility of the RFID tag being damaged.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a new and improved technique capable of appropriately detecting movement for unloading at an unloading site. It is to provide an approach detection device and an approach detection system.

  In order to solve the above-described problems, according to an aspect of the present invention, the truck is loaded based on a relationship of communication between each of the track communication devices arranged at a plurality of locations of the track and an external communication device outside the track. A detection unit that detects whether or not a movement for unloading has been performed at the unloading site, and a relationship between the reception strength of each of the track communication devices in communication between each of the track communication devices and the external communication device Further comprising an intensity relationship specifying unit, wherein the detection unit is configured to allow the truck to unload based on a degree of coincidence between the relationship between the received intensity specified by the intensity relationship specifying unit and a predetermined received intensity relationship. An approach detection device is provided for detecting whether or not the movement has been performed.

  The approach detection device further includes an order specifying unit that specifies an order relationship of the truck communication device that can communicate with the external communication device, and the detection unit includes the order relationship specified by the order specifying unit. Based on the degree of coincidence with a predetermined order relationship, it may be detected whether or not the truck has moved for unloading.

  When the degree of coincidence between the relationship between the reception strength specified by the strength relationship specifying unit and the relationship between the predetermined reception strengths exceeds a threshold for a predetermined time, the detection unit detects that the truck is to be unloaded. It may be detected that the movement is performed.

  The approach detection device further includes a storage unit that stores identification information of each of the track communication devices in a grouped state for each track on which the track communication device is disposed, and the detection unit includes the same group. Based on the communication relationship between each of the truck communication devices to be formed and the external communication device, it may be detected whether or not the truck corresponding to the group has moved for unloading.

  In order to solve the above-mentioned problem, according to another aspect of the present invention, a track in which a track communication device is disposed at a plurality of locations, an external communication device provided outside the track, and the track is disposed on the track. Based on the communication relationship between each of the truck communicators and the external communicator, a detection unit that detects whether or not the truck has moved for unloading at the unloading site, and the truck communicator A strength relationship specifying unit that specifies a relationship between the reception strengths of each of the track communication devices in communication with each of the external communication devices, and the detection unit is configured to determine the reception strength specified by the strength relationship specifying unit. And an entry detection device that detects whether or not the truck has made a movement for unloading based on a degree of coincidence between the relation and a predetermined reception strength relation. Temu is provided.

  As described above, according to the present invention, it is possible to appropriately detect the movement for unloading in the unloading field.

It is explanatory drawing which showed the structure of the approach detection system by embodiment of this invention. It is explanatory drawing which showed the specific example of arrangement | positioning of the RFID tag in a track | truck. It is the functional block diagram which showed the structure of the approach detection apparatus by 1st Embodiment. It is explanatory drawing which showed the state which the truck approached the unloading place of the crushed stone slot. It is explanatory drawing which showed the relationship of the receiving intensity of a RFID tag. It is the flowchart which showed operation | movement of the approach detection apparatus by 1st Embodiment. It is the functional block diagram which showed the structure of the approach detection apparatus by 2nd Embodiment. It is explanatory drawing which showed the approach to the unloading place to a truck. It is explanatory drawing which showed the approach to the unloading place to a truck. It is the flowchart which showed operation | movement of the approach detection apparatus by 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the present specification and drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numerals are given.

<< 1. Configuration of intrusion detection system >>
The present invention can be implemented in various forms as will be described in detail in “2. First Embodiment” and “3. Second Embodiment” as an example. In addition, the entry detection device according to each embodiment determines whether or not the vehicle has entered the target area based on the relationship of communication between each of the vehicle communication devices arranged at a plurality of locations of the vehicle and external communication devices outside the vehicle. An entry detection unit for detecting

  Below, the basic composition of the approach detection system which has an approach detection device by such each embodiment first is explained.

  FIG. 1 is an explanatory diagram showing a configuration of an approach detection system according to an embodiment of the present invention. As shown in FIG. 1, the approach detection system according to the embodiment of the present invention includes a truck 12, a crushed stone inlet 14, an RFID antenna 16, and an approach detection device 20.

  The truck 12 is an example of a vehicle for transporting goods. In particular, the truck 12 according to the present embodiment is loaded with crushed stone such as limestone mined at the mining site, transports the crushed stone to the unloading site of the crushed stone inlet 14, and unloads the crushed stone to the unloading site. . The truck 12 includes vehicle communication devices such as RFID tags at a plurality of locations. For example, the track 12 includes RFID tags at at least two of the four corners in plan view. Hereinafter, this point will be specifically described with reference to FIG.

  FIG. 2 is an explanatory diagram showing a specific example of the arrangement of RFID tags in the track 12. As shown in FIG. 2, the track 12 includes a plurality of RFID tags T1 to T8. The RFID tags T1, T3, T6 and T8 are arranged at the four corners of the track 12 in plan view. According to such an arrangement of the RFID tags T1, T3, T6, and T8, the distances between the RFID tags T1, T3, T6, and T8 and the RFID antenna 16 are different as shown in FIG. As a result, the reception intensity of the radio wave transmitted from the RFID antenna 16 in the RFID tags T1, T3, T6, and T8 or the detection start timing of the radio wave transmitted from the RFID antenna 16 is different. Although details will be described later, according to the present embodiment, it is possible to appropriately detect the entry of the truck 12 to the unloading site based on such a difference in communication characteristics between a plurality of RFID tags.

  Further, as shown in FIG. 2, the track 12 may include RFID tags T2, T4, T5, and T7 between four corners in plan view. With such a configuration, it becomes possible to use information of a larger number of RFID tags, so that the detection accuracy of the entry of the truck 12 into the unloading site can be improved. Furthermore, since the redundancy of the RFID tag is increased, it is possible to suppress the influence caused by the damage or failure of some RFID tags. Note that the RFID tags T4 and T5 may be provided in a loading platform portion of the truck 12, or may be provided in a main body portion of the truck 12.

  In FIG. 2, the truck 12 is shown as an example of the vehicle, but the vehicle is not limited to the truck 12. For example, the vehicle may be a special vehicle such as a shovel car or a general vehicle such as a passenger car.

  A crushed stone conveyed by the truck 12 is loaded into the crushed stone inlet 14. In addition, the truck 12 throws in a crushed stone by raising the front of the loading platform and tilting the loading platform. For this reason, the truck 12 enters the unloading site by the back when unloading, that is, when the crushed stone is introduced.

  The RFID antenna 16 is an example of an external communication device provided outside the vehicle, and communicates with an RFID tag disposed on the truck 12. For example, the RFID antenna 16 can transmit radio waves in units of several ms and receive tag IDs, radio wave reception intensity information, and the like from the RFID tags arranged on the track 12. 1 and 2 show an example in which the RFID antenna 16 is located behind the right hand of the truck 12 that has entered the unloading site. The position of the RFID antenna 16 is the example shown in FIGS. 1 and 2. It is not limited to.

  The approach detection device 20 detects whether or not the truck 12 has entered the unloading place to the crushed stone inlet based on the communication relationship between each of the plurality of RFID tags arranged on the truck 12 and the RFID antenna 16. To do. In particular, the entry detection device 20-1 according to the first embodiment detects the entry of the track 12 based on the relationship between the reception strengths of the plurality of RFID tags, and the entry detection device 20-2 according to the second embodiment. Detects the entry of the track 12 based on the order relationship of the RFID tags that have detected the radio waves transmitted from the RFID antenna 16. Hereinafter, the first embodiment and the second embodiment will be sequentially described in detail.

<< 2. First Embodiment >>
<2-1. Configuration of ingress detection device>
FIG. 3 is a functional block diagram showing the configuration of the ingress detection device 20-1 according to the first embodiment. As illustrated in FIG. 3, the approach detection device 20-1 according to the first embodiment includes a storage unit 22, a strength relationship specifying unit 24, and an approach detection unit 26.

(Memory part)
The memory | storage part 22 memorize | stores each tag ID of an RFID tag in the state grouped for every vehicle by which the RFID tag is arrange | positioned. For example, the storage unit 22 stores the tag IDs of the RFID tags T1 to T8 arranged on the same truck 12 and the vehicle ID of the truck 12 in association with each other.

(Strength-related identification part)
The intensity relationship specifying unit 24 receives the reception intensity of the radio wave transmitted from the RFID antenna 16 in the RFID tags T1 to T8 mounted on the track 12 from the RFID receiver 18. The RFID receiver 18 demodulates and decodes the signal received by the RFID antenna 16 to obtain the number of radio wave receptions between the RFID antenna 16 and the RFID tag, the reception intensity of the RFID tag, and the like. be able to.

  Then, the strength relationship specifying unit 24 observes the received strength received from the RFID receiver 18 in the RFID tags grouped in the storage unit 22, and specifies the relationship between the received strengths of the RFID tags constituting the same group. . For example, the strength relationship specifying unit 24 specifies the relationship between the reception strengths of the RFID tags T1 to T8 arranged on the track 12 as follows.

-Specific example of relationship of received intensity Example 1: T1>T2>T3>T4>T5>T6>T7> T8
Example 2: T1>T2>T4>T5>T7> T8
Example 3: T6>T7>T4>T8>T5>T1>T2> T3

(Entry detection unit)
The entry detection unit 26 determines whether or not the truck 12 has entered the unloading site based on the degree of coincidence between the relationship between the reception strength of the RFID tag identified by the strength relationship identification unit 24 and the relationship between the predetermined reception strengths. Detect. Here, the predetermined reception strength is a relationship of reception strength assumed when the truck 12 enters the unloading place for unloading. The relationship between the predetermined reception strengths will be specifically described below with reference to FIGS. 4 and 5.

  FIG. 4 is an explanatory view showing a state in which the truck 12 has entered the unloading place of the crushed stone inlet 14. As shown in FIG. 4, the truck 12 enters the unloading site with a back for the purpose of unloading. For this reason, as shown in FIG. 4, the distance between the RFID antenna 16 and each of the RFID tags T1 to T8 has the following relationship.

-Distance relationship between the RFID antenna 16 and each of the RFID tags T1 to T8 T8>T7>T6>T5>T4>T3>T2> T1

  Here, the reception intensity increases as the RFID tag is closer to the RFID antenna 16. For this reason, as shown in FIG. 5, the following relationship (relationship of predetermined reception strength) of each of the reception strengths of the RFID tags T1 to T8 is derived from the above distance relationship.

-Relationship between predetermined reception strengths T1>T2>T3>T4>T5>T6>T7> T8

  The entry detection unit 26 determines whether or not the truck 12 has entered the unloading site based on the degree of coincidence between the predetermined reception intensity relationship and the reception intensity relationship of the RFID tag identified by the intensity relationship identification unit 24. Is detected. Specifically, the entry detection unit 26 detects that the truck 12 has entered the unloading site when the degree of coincidence of the relationship between the two reception strengths exceeds a threshold value.

  For example, when the relationship between the reception strengths shown in Example 1 is specified by the strength relationship specifying unit 24, the relationship between the two reception strengths matches, so that the entry detection unit 26 is associated with the tag ID of the tags T1 to T8. It is detected that the truck 12 having the vehicle ID has entered the unloading place. In addition, since it is considered that the truck 12 is stopped until the unloading is completed, the approach detection unit 26 unloads the truck 12 when the degree of coincidence of the relationship between the two reception strengths exceeds a threshold for a predetermined time. You may detect that you have entered the field. With this configuration, it is possible to detect only the entry of the truck 12 that has been unloaded more reliably.

  In addition, when the relationship between the reception strengths shown in Example 2 is specified by the strength relationship specifying unit 24 due to the failure of the RFID tags T3 and T6, the relationship between the reception strengths of both does not match. However, since the relationship between the reception strengths of the six RFID tags that have not failed matches the relationship of the predetermined reception strength, the intrusion detection unit 26, for example, determines the number of tags that have the same relationship / the number of installed tags. , The degree of coincidence between the two relationships is calculated as 75%. Therefore, when the threshold is 70%, the entry detection unit 26 detects that the truck 12 has entered the unloading field. In this way, by performing entry detection using a threshold value, it is possible to continue system operation even if some RFID tags are damaged or malfunctioned.

  On the other hand, when the truck 12 passes by the side of the RFID antenna 16 while moving forward, as shown in Example 3, the reception intensity of the RFID tag arranged in front of the track 12 is the reception intensity of the RFID tag arranged in the rear. Get higher. Since the degree of coincidence between the relationship between the received strengths and the predetermined relationship is low, the entry detection unit 26 does not detect that the truck 12 has entered the unloading site.

  As described above, the approach detection unit 26 can appropriately detect the approach of the truck 12 to the unloading site by distinguishing it from passing nearby based on the relationship between the reception strengths of the plurality of RFID tags. . Further, according to the approach detection system according to the first embodiment, it is possible to adjust the reception intensity even in a site where the radio wave propagation situation may change due to changes in the site environment such as weather, truck 12 or equipment. The entry of the truck 12 can be detected appropriately without adjusting the transmission intensity and directivity. In addition, since RFID tags are provided at a plurality of locations on the track 12, operational redundancy is also ensured.

<2-2. Operation of the entry detection device>
In the above, the structure of the approach detection apparatus 20-1 by 1st Embodiment was demonstrated. Then, with reference to FIG. 6, operation | movement of the approach detection apparatus 20-1 by 1st Embodiment is arranged.

  FIG. 6 is a flowchart showing the operation of the approach detection device 20-1 according to the first embodiment. As shown in FIG. 6, first, the intrusion detection device 20-1 acquires the reception intensity information of each RFID tag disposed on the track 12 from the RFID receiver 18 (S110).

  Then, the strength relationship specifying unit 24 observes the received strength received from the RFID receiver 18 in the RFID tags grouped in the storage unit 22, and specifies the relationship between the received strengths of the RFID tags constituting the same group. (S120).

  Thereafter, the intrusion detection unit 26 determines whether or not the degree of coincidence between the relationship between the reception strengths of the RFID tag specified by the strength relationship specification unit 24 and the relationship between the predetermined reception strengths is equal to or greater than a threshold value (S130). If the matching degree is equal to or greater than the threshold, it is detected that the track 12 corresponding to the RFID tag has entered (S140).

<< 3. Second Embodiment >>
The first embodiment of the present invention has been described above. Subsequently, a second embodiment of the present invention will be described. According to the second embodiment of the present invention, it is possible to detect the entry of the track 12 based on the order relationship of the RFID tags detected by the RFID antenna 16.

<3-1. Configuration of ingress detection device>
FIG. 7 is a functional block diagram showing the configuration of the ingress detection device 20-2 according to the second embodiment. As illustrated in FIG. 7, the approach detection device 20-2 according to the second embodiment includes a storage unit 22, a detection order specifying unit 25, and an approach detection unit 27.

(Memory part)
Similar to the first embodiment, the storage unit 22 stores the tag IDs of the RFID tags in a grouped state for each vehicle on which the RFID tags are arranged. For example, the storage unit 22 stores the tag IDs of the RFID tags T1 to T8 arranged on the same truck 12 and the vehicle ID of the truck 12 in association with each other.

(Detection order identification part)
The detection order specifying unit 25 receives information detected by the RFID antenna 16 of the RFID tags T1 to T8 mounted on the track 12 from the RFID receiver 18. The detection order specifying unit 25 specifies the order relation of the RFID tags that can communicate with the RFID antenna 16, that is, the order relation in which the RFID tags are detected by the RFID antenna 16.

(Entry detection unit)
The entry detection unit 27 detects whether or not the truck 12 has entered the unloading site based on the degree of coincidence between the detection order relationship of the RFID tags specified by the detection order specification unit 25 and a predetermined order relationship. Here, the predetermined order relationship is an RFID tag detection order assumed when the truck 12 enters the unloading place for unloading. Hereinafter, the predetermined order relationship will be specifically described with reference to FIGS. 8 and 9.

  For example, as shown in FIG. 8, when the truck 12 tries to enter the unloading site with the back, the RFID tag T1 closest to the RFID antenna 16 enters the radio wave reachable range of the RFID antenna 16 first. Tag T1 is detected first. Thereafter, as shown in FIG. 9, it is considered that the RFID tags T2 to T8 are detected in the following order relationship in the process in which the entry of the truck 12 into the unloading site is completed.

-Predetermined order relationship T1->T2->T3->T4->T5->T6->T7-> T8

  Therefore, the entry detection unit 27 enters the unloading field when the degree of coincidence between the predetermined order relationship described above and the detection order relationship of the RFID tags specified by the detection order specification unit 25 exceeds a threshold value. It is detected that

  For example, when the detection order relationship of the RFID tags specified by the detection order specifying unit 25 is the same as the predetermined order relationship, the entry detection unit 27 determines that the entry detection unit 27 has the tag IDs of the tags T1 to T8. It is detected that the truck 12 having the associated vehicle ID has entered the unloading area.

Further, when the following detection order relationship is specified by the detection order specifying unit 25 due to the failure of the RFID tags T3 and T6, the detection order relationship does not match the predetermined order relationship.
T1->T2->T4->T5->T7-> T8

  However, since the detection order relationship of the six RFID tags that have not failed matches the predetermined order relationship, the intrusion detection unit 27 calculates, for example, the number of tags with the same relationship / the number of installed tags. Thus, the degree of coincidence between the two relationships is calculated as 75%. Therefore, when the threshold is 70%, the entry detection unit 27 detects that the truck 12 has entered the unloading site. In this way, by performing entry detection using a threshold value, it is possible to continue system operation even if some RFID tags are damaged or malfunctioned.

On the other hand, when the truck 12 passes while moving alongside the RFID antenna 16, it is considered that the RFID tag arranged in front of the truck 12 is detected earlier than the RFID tag arranged in the rear as shown below. . Since the degree of coincidence between the detection order relationship and the predetermined order relationship is low, the entry detection unit 27 does not detect that the truck 12 has entered the unloading site.
T6 → T7 → T4 → T8 → T5 → T1 → T2 → T3

  As described above, the approach detection unit 27 can appropriately detect the approach of the truck 12 to the unloading site by distinguishing it from passing nearby based on the detection order relationship of each of the plurality of RFID tags. is there.

<2-3. Operation of the entry detection device>
In the above, the structure of the approach detection apparatus 20-2 by 2nd Embodiment was demonstrated. Subsequently, with reference to FIG. 10, the operation of the approach detection device 20-2 according to the second embodiment is organized.

  FIG. 10 is a flowchart showing the operation of the approach detection device 20-2 according to the second embodiment. As shown in FIG. 10, first, the entry detection device 20-2 acquires detection information of each RFID tag arranged on the track 12 from the RFID receiver 18 (S210).

  Then, the detection order specifying unit 25 observes the detection information received from the RFID receiver 18 in the RFID tags grouped in the storage unit 22, and specifies the detection order relationship of the RFID tags constituting the same group ( S230).

  Thereafter, the entry detection unit 27 determines whether or not the degree of coincidence between the detection order relationship of the RFID tags specified by the detection order specifying unit 25 and a predetermined order relationship is equal to or greater than a threshold (S230). If it is equal to or greater than the threshold, it is detected that the track 12 corresponding to the RFID tag has entered (S240).

<< 4. Supplement >>
As described above, the first embodiment and the second embodiment have been described individually. However, the first embodiment and the second embodiment can be combined. For example, the intrusion detection apparatus 20 has a matching degree between the RFID tag detection order relationship and the predetermined order relationship equal to or greater than a threshold (second embodiment), and the relationship between the RFID tag reception strength and the predetermined reception strength. When the degree of coincidence with the relationship is equal to or greater than a threshold value (first embodiment), it may be detected that the truck 12 has entered.

  Further, in the above description, the example in which the approach detection system according to the present embodiment is applied to the entry detection to the unloading place of the crushed stone inlet has been described. However, the present embodiment can be applied to other uses as well. is there. For example, since logistics-related trucks often enter the unloading site in the back, this embodiment can also be applied to logistics-related truck unloading management / inspection management. Although it is conceivable to systematize the above management using a DSRC / IC card as an alternative, there are some concerns. For example, in DSRC, there is a concern that erroneous detection may occur due to interference of adjacent radio waves or influence of radio wave propagation conditions such as reflected waves. In addition, since there is a person in the IC card, there is a concern that erroneous detection due to a human error may occur. On the other hand, according to the embodiment of the present invention, it is possible to appropriately detect the approach of the truck to the unloading site.

<< 5. Conclusion >>
As described above, according to the first embodiment of the present invention, the approach of the truck 12 to the unloading place is distinguished from the passing of the neighborhood based on the relationship between the reception strengths of the plurality of RFID tags. Can be detected. In addition, according to the second embodiment of the present invention, it is possible to appropriately detect the approach of the truck 12 to the unloading site based on the detection order relationship of each of the plurality of RFID tags, distinguishing it from passing nearby. Is possible.

  In addition, according to the first and second embodiments of the present invention, the reception intensity can be obtained even at a site where the radio wave propagation situation may change due to changes in the field environment such as weather, truck 12 or equipment. It is possible to appropriately detect the entry of the truck 12 without adjusting the transmission intensity and directivity for the adjustment. In addition, since RFID tags are provided at a plurality of locations on the track 12, operational redundancy is also ensured.

  Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, each step in the processing of the approach detection device 20 of the present specification does not necessarily have to be processed in time series in the order described as a flowchart. For example, each step in the processing of the entry detection device 20 may be processed in an order different from the order described as the flowchart, or may be processed in parallel.

  Further, it is possible to create a computer program for causing hardware such as a CPU, ROM, and RAM incorporated in the approach detection device 20 to perform the same functions as the components of the approach detection device 20 described above. A storage medium storing the computer program is also provided.

12 truck 14 crushed stone inlet 16 RFID antenna 18 RFID receiver 20 entry detection device 22 storage unit 24 strength relationship identification unit 25 detection order identification unit 26, 27 entry detection unit

Claims (5)

Based on the communication relationship between each of the truck communication devices arranged at a plurality of locations of the truck and the external communication device outside the truck, it is detected whether or not the truck has moved for unloading at the unloading site. A detection unit;
An intensity relationship specifying unit for specifying a relationship between the reception strengths of the track communication devices in communication between each of the track communication devices and the external communication device;
The detection unit determines whether or not the truck has moved for unloading based on a degree of coincidence between the reception strength relationship specified by the strength relationship specification unit and a predetermined reception strength relationship. An entry detection device that detects. The approach detection device is
An order specifying unit for specifying an order relationship of the truck communication device that can communicate with the external communication device;
2. The detection unit detects whether or not the truck has made a movement for unloading based on a degree of coincidence between the order relationship specified by the order specifying unit and a predetermined order relationship. The intrusion detection device described in 1.   When the degree of coincidence between the relationship between the reception strength specified by the strength relationship specifying unit and the relationship between the predetermined reception strengths exceeds a threshold for a predetermined time, the detection unit detects that the truck is to be unloaded. The intrusion detection device according to claim 1, wherein the intrusion detection device detects that the movement is performed. The approach detection device is
A storage unit for storing the identification information of each of the track communication devices in a grouped state for each track on which the track communication device is disposed;
The detection unit determines whether or not the truck corresponding to the group has made a movement for unloading based on a communication relationship between each of the truck communication devices forming the same group and the external communication device. The approach detection apparatus according to any one of claims 1 to 3, which detects the entry detection apparatus. A track with track communication devices arranged in multiple locations;
An external communicator provided outside the truck;
A detection unit for detecting whether or not the truck has made a movement for unloading at an unloading site based on a communication relationship between each of the track communication devices arranged on the truck and the external communication device; And an intensity relationship identifying unit that identifies a relationship between the reception strengths of each of the track communication devices in communication between each of the track communication devices and the external communication device,
The detection unit determines whether or not the truck has moved for unloading based on a degree of coincidence between the reception strength relationship specified by the strength relationship specification unit and a predetermined reception strength relationship. An entry detection device to detect,
An intrusion detection system.

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