JP2021131586A - Transportation vehicle on-vehicle machine and notification system - Google Patents

Abstract

To provide a transportation vehicle on-vehicle machine and a notification system capable of reducing a possibility of a collision with a mobile body while suppressing complication of a constitution.SOLUTION: A transportation vehicle on-vehicle machine 10 is mounted on a transportation vehicle and includes: a reception intensity acquisition section 14a for acquiring information of reception intensity of a signal from a beacon transmitter possessed by an operator outside the vehicle; a movement information acquisition section 14b for acquiring movement information which indicates presence/absence of a movement of the transportation vehicle; and a notification processing section 14c for determining a danger level based on the information acquired by the reception intensity acquisition section 14a and the movement information acquisition section 14b, so as to perform notification processing.SELECTED DRAWING: Figure 2

Description

The present invention relates to a transport vehicle on-board unit and a notification system.

Conventionally, an on-board unit capable of detecting a moving object such as a person approaching a vehicle by a sonar and a radar and sounding an alarm is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-135957

However, in the in-vehicle device described in Patent Document 1, distance sensors for measuring the distance from a moving body such as a sonar and a radar must be installed in multiple directions such as front, back, left, and right of the vehicle, which complicates the configuration. Invited, there was a possibility that it would be disadvantageous in terms of cost. In particular, for transport vehicles such as forklifts that are used only on a limited site, it tends to be difficult to mount expensive special parts that are disadvantageous in terms of cost, and collisions with moving objects while suppressing the complexity of the configuration. It is desirable to be able to install a function to avoid.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to reduce the possibility of collision with a moving body while suppressing the complexity of the configuration. The purpose is to provide an on-board unit for a transport vehicle and a notification system.

The transport vehicle on-board unit according to the present invention is a transport vehicle on-board unit mounted on a transport vehicle, and is a reception strength acquisition means for acquiring information on the reception strength of a signal from a signal transmission terminal held by a moving body outside the vehicle. The danger level is determined and notified based on the information acquired by the movement information acquisition means for acquiring the movement information indicating the presence or absence of the movement of the transport vehicle, the reception strength acquisition means, and the movement information acquisition means. It is provided with a notification processing means for processing.

Further, the notification system according to the present invention is a notification system including the above-described transport vehicle on-board unit and a server capable of communicating with a plurality of the transport vehicle on-board units, and is a notification system including a plurality of the transport vehicle on-board units. The on-board unit further includes a storage means for storing information on the location where the notification processing is performed by the notification processing means, and a communication means for transmitting the information on the location stored by the storage means to the server. The server collects information on the location transmitted by the communication means of the plurality of on-board units of the transport vehicle, determines a dangerous area based on the collected information on the location, and feeds back the information individually. The notification processing means of the transport vehicle on-board unit of the transport vehicle performs notification processing in advance based on the information of the danger area fed back by the server.

According to the present invention, the possibility of collision with a moving body can be reduced while suppressing the complexity of the configuration.

It is a block diagram which shows the notification system which concerns on embodiment of this invention. It is a block diagram which shows the detail of each transport vehicle on-board unit shown in FIG. It is a schematic diagram which shows the outline of the operation of the transport vehicle on-board unit which concerns on this embodiment, (a) shows the case where a transport vehicle is moving backward, and (b) shows the case where a transport vehicle is moving forward. There is. It is a 1st flowchart which shows the approach warning method by the transport vehicle on-board unit shown in FIG. It is a 2nd flowchart which shows the approach warning method by the transport vehicle on-board unit shown in FIG.

Hereinafter, the present invention will be described with reference to preferred embodiments. The present invention is not limited to the embodiments shown below, and can be appropriately modified without departing from the spirit of the present invention. Further, in the embodiments shown below, some parts of the configuration are omitted from the illustration and description, but the details of the omitted technology are within a range that does not cause any contradiction with the contents described below. Needless to say, publicly known or well-known techniques are appropriately applied.

FIG. 1 is a configuration diagram showing a notification system according to an embodiment of the present invention. The notification system 1 shown in FIG. 1 includes a plurality of on-board units 10 for transport vehicles, a server 20, and a plurality of beacon transmitters (signal transmission terminals) 30. Each of the plurality of transport vehicle on-board units 10 is mounted on a transport vehicle TV such as a forklift, and is an authentication device that authenticates the crew of the transport vehicle TV. The transport vehicle on-board unit 10 is configured to be able to communicate with a server 20 installed in a management office such as a warehouse where a transport vehicle TV is used, for example.

On the premises where the transport vehicle TV is used, a worker (an example of a mobile body) W other than the crew member C of the transport vehicle TV carries the beacon transmitter 30. The beacon transmitter 30 transmits radio waves, and is built in, for example, an employee ID card of a worker W. The beacon transmitter 30 is not limited to the employee ID card, but is built into other things (helmet, hat, etc.) as long as it is possessed (carried) by the worker W who is working, such as a work instruction sheet or a kanban. May be equalized.

Each on-board unit 10 of the transport vehicle receives the radio wave from the beacon transmitter 30 and determines the danger level based on the strength of the received radio wave and the like, and asks the crew member C to avoid a collision with the worker W. Notification (approach warning notification) is given to the user.

Further, the plurality of transport vehicle on-board units 10 transmit information on the time and place where the notification (notification processing) is performed to the server 20. The server 20 determines a dangerous area by performing a specific process or a process by AI based on the information received from the plurality of transport vehicle on-board units 10, and transmits the information on the dangerous area to each transport vehicle on-board unit 10. provide feedback. Each transport vehicle on-board unit 10 notifies the crew member C in advance based on the fed-back information on the dangerous area (for example, when the transport vehicle TV approaches the dangerous area).

FIG. 2 is a block diagram showing details of each on-board unit 10 of the transport vehicle shown in FIG. As shown in FIG. 2, the transport vehicle on-board unit 10 includes a beacon receiving unit 11, a speed detecting unit 12, a voice output unit 13, and a CPU (Central Processing Unit) 14.

The beacon receiving unit 11 receives radio waves from the beacon transmitter 30 owned by the worker W, and includes a beacon antenna 11a and a beacon module 11b. The beacon receiving unit 11 transmits the signal of the radio wave received by the beacon antenna 11a to the CPU 14 via the beacon module 11b.

The speed detection unit 12 detects the speed of the on-board unit 10 of the transport vehicle, and is composed of, for example, a vehicle speed sensor. The speed detection unit 12 transmits a signal corresponding to the vehicle speed to the CPU 14. The voice output unit 13 gives an approach warning notification according to an instruction from the on-board unit 10 of the transport vehicle, and includes a speaker 13a and a voice codec 13b. The voice output unit 13 outputs the voice of the approach warning notification from the speaker 13a via the voice codec 13b.

The CPU 14 controls the entire transport vehicle on-board unit 10, and includes a reception strength acquisition unit (reception strength acquisition means) 14a, a movement information acquisition unit (movement information acquisition means) 14b, and a notification processing unit (notification processing means). ) 14c and is provided.

The reception strength acquisition unit 14a acquires information on the reception strength of the signal from the beacon transmitter 30 held by the worker W outside the vehicle based on the signal transmitted from the beacon reception unit 11. Here, the reception intensity tends to increase as the distance between the transport vehicle TV and the beacon transmitter 30 decreases. Therefore, the reception intensity acquisition unit 14a can acquire information on whether or not the worker W is in close proximity based on the reception intensity.

The movement information acquisition unit 14b acquires movement information indicating whether or not the transport vehicle TV is moving, based on the speed signal from the speed detection unit 12. The movement information acquisition unit 14b acquires movement information indicating that the transport vehicle TV is moving when the speed signal does not indicate zero, and when the speed signal indicates zero, the transport vehicle TV acquires the movement information. Acquire movement information indicating that the vehicle is not moving.

The notification processing unit 14c determines the danger level based on the information acquired by the reception strength acquisition unit 14a and the movement information acquisition unit 14b, and notifies the notification. This notification processing unit 14c is dangerous when the reception strength information acquired by the reception strength acquisition unit 14a shows an intensity equal to or higher than a predetermined value and the movement of the transport vehicle TV is confirmed by the movement information acquisition unit 14b. Judge that the level is high and perform notification processing. As a result, the approach warning notification is output from the voice output unit 13.

On the other hand, in the notification processing unit 14c, even if the reception strength information acquired by the reception strength acquisition unit 14a shows an intensity equal to or higher than a predetermined value, the movement information acquisition unit 14b does not confirm the movement of the transport vehicle TV. In addition, it is prohibited to give notification by judging that the risk level is not high. As a result, the approach warning notification from the voice output unit 13 is not performed. Further, the notification processing unit 14c prohibits the notification processing unit 14c from performing the notification processing by determining that the danger level is not high even when the reception strength information acquired by the reception strength acquisition unit 14a does not show the strength equal to or higher than a predetermined value. do.

Further, the transport vehicle on-board unit 10 includes a digital signal input unit 15 and an image pickup unit 16, and the CPU 14 includes an image information acquisition unit (image information acquisition means) 14d and a visibility determination unit (visibility determination means) 14e. , It is preferable to determine the danger level by taking these information into consideration and perform the notification process.

The digital signal input unit 15 is a portion for inputting a digital signal from the transport vehicle TV, and in the present embodiment, inputs a back signal when the shift lever is backed up.

The imaging unit 16 includes a CMOS (Complementary Metal Oxide Semiconductor) camera 16a that functions as an imaging means for imaging the front of the transport vehicle TV, and a camera I / F (Interface) 16b. In particular, the angle of view of the CMOS camera 16a is set so that the transported object is included in the image when the transported object is loaded on the transport vehicle TV. The image pickup unit 16 transmits the information of the front image of the transport vehicle TV captured by the CMOS camera 16a to the CPU 14 via the camera I / F 16b. In this embodiment, since the transport vehicle TV is assumed to be a forklift, the CMOS camera 16a captures the front of the vehicle, but the present invention is not limited to this, and other transport vehicle TVs that load the transported object other than the front. In the case of, the other direction (loading direction of the transported object) may be imaged so that the transported object is included.

The image information acquisition unit 14d acquires information on the captured image obtained by the imaging unit 16, that is, the captured image obtained by imaging the front of the transport vehicle TV. The field of view determination unit 14e determines whether or not a field of view equal to or higher than a specified value can be secured based on the captured image acquired by the image information acquisition unit 14d. When, for example, the speed detection unit 12 confirms the movement of the transport vehicle TV, but there is a stationary object in the image that does not change for a predetermined time or more, the visibility determination unit 14e transfers the stationary object. Based on the proportion of the transported object in the image (that is, the size of the stopped object), it is determined whether or not the visibility exceeding the specified value can be secured.

In order to provide such a configuration, the notification processing unit 14c shows that the reception intensity information acquired by the reception intensity acquisition unit 14a shows an intensity equal to or higher than a predetermined value, and the movement information acquisition unit 14b moves the transport vehicle TV. In the case of confirmation, when the visibility determination unit 14e cannot secure the visibility equal to or higher than the specified value, it is preferable to determine that the danger level is high and perform the notification process. On the other hand, in the notification processing unit 14c, the reception intensity information acquired by the reception intensity acquisition unit 14a shows an intensity equal to or higher than a predetermined value, and the movement information acquisition unit 14b confirms the movement of the transport vehicle TV. However, if it is determined by the visibility determination unit 14e that the visibility equal to or higher than the specified value can be secured, it is preferable to prohibit the notification processing by determining that the danger level is not high. This is because it is possible to optimize the notification by executing the notification when the field of view is not open, without issuing the approach warning notification when the field of view is open.

In addition, the transport vehicle on-board unit 10 further includes a storage unit (storage means) 17 and a communication unit (communication means) 18, and the CPU 14 includes a communication processing unit 14f.

The storage unit 17 serves as a storage area for an operation program for operating the on-board unit 10 of the transport vehicle and a work area for performing various processes, and is a ROM (Flash Read Only Memory) 17a and a DDR (Double Data Rate). ) 17b and is provided. The FROM 17a is a non-volatile memory in which data is not lost even when the power is turned off. DDR17b is a double data rate type SDRAM (Synchronous Dynamic Random Access Memory). In the present embodiment, the storage unit 17 stores information on the place and time when the notification processing is performed by the notification processing unit 14c. The location information is acquired by using GPS or the like (not shown). As the time information, for example, information from a clock unit (not shown) is used.

The communication unit 18 includes an LTE antenna 18a and an LTE module 18b for communicating by LTE (Long Term Evolution), and a Wi-Fi antenna 18c and a Wi-Fi module 18d for communicating by Wi-Fi (registered trademark). And have. In particular, in the present embodiment, the communication unit 18 transmits the location and time information stored by the storage unit 17 to the server 20 under the control of the communication processing unit 14f.

The server 20 collects the location information transmitted by the communication unit 18 of the plurality of transport vehicle on-board units 10, and based on the collected location information (for example, the location collected in a specific area consisting of a predetermined range). The dangerous area is determined (based on whether the information is equal to or greater than a predetermined number) and fed back to each on-board unit 10 of the transport vehicle. As a result, the notification processing unit 14c of each on-board unit 10 of the transport vehicle can perform notification processing in advance based on the information of the dangerous area fed back by the server 20. That is, when the transport vehicle TV approaches a place where the approach warning notification frequently occurs, the crew member C can be notified in advance to call attention in advance.

In addition, it is preferable that the server 20 considers not only the location information transmitted by the communication unit 18 of the plurality of transport vehicle on-board units 10 but also the time information. For example, it is preferable that the server 20 determines the dangerous time in the dangerous area and feeds it back to each on-board unit 10 of the transport vehicle by specifying the time zone in which the notification processing is performed in a predetermined number or more in the dangerous area. As a result, when the transport vehicle TV approaches the place during the time when the approach warning notification frequently occurs, the crew member C can be notified in advance to call attention in advance.

Next, an outline of the operation of the transport vehicle on-board unit 10 according to the present embodiment will be described. FIG. 3 is a schematic view showing an outline of the operation of the transport vehicle on-board unit 10 according to the present embodiment, (a) shows a case where the transport vehicle TV is retracted, and (b) is a case where the transport vehicle TV is moving forward. It shows the case where it is.

When the transport vehicle TV is retracted as shown in FIG. 3A, a signal corresponding to the vehicle speed is transmitted from the speed detection unit 12 shown in FIG. 2 to the CPU 14. Further, a back signal is input to the CPU 14 via the digital signal input unit 15. As a result, the movement information acquisition unit 14b determines that the transport vehicle TV is moving, and the CPU 14 determines that the transport vehicle TV is moving backward.

In such a case, the notification processing unit 14c determines that the danger level is high and performs notification processing when the reception strength information acquired by the reception strength acquisition unit 14a during retreat shows a reception strength equal to or higher than a predetermined value. To execute. As a result, the approach warning notification is given to the crew member C.

Further, when the transport vehicle TV is moving forward as shown in FIG. 3B, a signal corresponding to the vehicle speed is transmitted from the speed detection unit 12 shown in FIG. 2 to the CPU 14. At this time, the back signal is not input. As a result, the movement information acquisition unit 14b determines that the transport vehicle TV is moving, and the CPU 14 determines that the transport vehicle TV is moving forward.

In addition, when the transport vehicle TV is moving forward, the image information acquisition unit 14d acquires the information of the captured image obtained by the image pickup by the image pickup unit 16. Then, the field of view determination unit 14e determines whether or not a field of view equal to or higher than the specified value is secured on the front side of the transport vehicle TV.

Then, in the notification processing unit 14c, the reception intensity information acquired by the reception intensity acquisition unit 14a during the forward movement indicates a reception intensity of a predetermined value or more, and the field of view determination unit 14e does not secure a field of view equal to or greater than the specified value. If it is determined that the risk level is high, the notification process is executed. As a result, the approach warning notification is given to the crew member C.

On the other hand, in the notification processing unit 14c, even when the reception intensity information acquired by the reception intensity acquisition unit 14a during the forward movement indicates a reception intensity of a predetermined value or more, the field of view determination unit 14e provides a field of view equal to or greater than the specified value. When it is judged that it is secured, it is judged that the danger level is not high and the execution of the notification process is prohibited.

Further, although not shown in FIG. 3, the transport vehicle on-board unit 10 stores the place and time when the notification process is performed in the storage unit 17, and the stored place and time information is stored in the server 20 via the communication unit 18. Send to. The server 20 collects the information received from the plurality of transport vehicle vehicle-mounted devices 10, determines the danger time zone in the danger area, and feeds it back to each transport vehicle vehicle-mounted device 10.

As a result, when the notification processing unit 14c approaches the dangerous area during the dangerous time zone, the notification processing unit 14c performs the notification processing in advance and alerts the crew member C.

FIG. 4 is a first flowchart showing an approach warning method using the on-board unit 10 of the transport vehicle shown in FIG. The process shown in FIG. 4 is repeatedly executed until the ignition switch of the transport vehicle TV is turned off and the power of the transport vehicle on-board unit 10 is turned off.

First, as shown in FIG. 4, the movement information acquisition unit 14b determines whether the transport vehicle TV is moving based on the speed signal from the speed detection unit 12 (S1). When the transport vehicle TV is not moving (S1: NO), this process is repeated until it is determined that the transport vehicle TV is moving. On the other hand, when the transport vehicle TV is moving (S1: YES), the CPU 14 determines whether the transport vehicle TV is moving backward based on the presence or absence of the back signal input to the digital signal input unit 15 (S2). ).

When the transport vehicle TV is not reversing (S2: NO), the process proceeds to step S1. When the transport vehicle TV is moving backward (S2: YES), the reception strength acquisition unit 14a determines whether the radio wave from the beacon transmitter 30 is being received based on the signal from the beacon reception unit 11 (S3). ).

When the radio wave from the beacon transmitter 30 is not received (S3: NO), the process proceeds to step S1. When the radio wave from the beacon transmitter 30 is received (S3: YES), the reception strength acquisition unit 14a determines whether the reception strength of the radio wave is equal to or higher than a predetermined value based on the signal from the beacon receiver 11. (S4).

When it is determined that the reception intensity of the radio wave is not equal to or higher than the predetermined value (S4: NO), the process proceeds to step S1. On the other hand, when the reception intensity of the radio wave is equal to or higher than a predetermined value (S4: YES), the notification processing unit 14c determines that the danger level is high and executes the notification processing. As a result, the approach warning notification is sent from the voice output unit 13 (S5). After that, the process shown in FIG. 4 ends.

FIG. 5 is a second flowchart showing an approach warning method by the on-board unit 10 of the transport vehicle shown in FIG. The process shown in FIG. 5 is also repeatedly executed until the ignition switch of the transport vehicle TV is turned off and the power of the transport vehicle on-board unit 10 is turned off.

First, as shown in FIG. 5, the movement information acquisition unit 14b determines whether the transport vehicle TV is moving based on the speed signal from the speed detection unit 12 (S11). When the transport vehicle TV is not moving (S11: NO), this process is repeated until it is determined that the transport vehicle TV is moving. On the other hand, when the transport vehicle TV is moving (S11: YES), the CPU 14 determines whether the transport vehicle TV is moving forward based on the presence or absence of the back signal input to the digital signal input unit 15 (S12). ).

If the transport vehicle TV is not moving forward (S12: NO), the process proceeds to step S11. When the transport vehicle TV is moving forward (S12: YES), the field of view determination unit 14e executes the forward field of view determination process (S13). In this process, the visibility determination unit 14e inputs the information of the captured image from the imaging unit 16 and identifies the transported object based on the stopped object in the image.

Next, the field of view determination unit 14e determines whether or not a field of view equal to or greater than the specified value is secured based on the proportion of the transported object in the image (S14). When the field of view equal to or higher than the specified value is secured (S14: YES), the process proceeds to step S11.

When the field of view equal to or higher than the specified value is not secured (S14: NO), the reception intensity acquisition unit 14a determines whether the radio wave from the beacon transmitter 30 is received based on the signal from the beacon reception unit 11 (S14: NO). S15).

When the radio wave from the beacon transmitter 30 is not received (S15: NO), the process proceeds to step S11. When the radio wave from the beacon transmitter 30 is received (S15: YES), the reception strength acquisition unit 14a determines whether the reception strength of the radio wave is equal to or higher than a predetermined value based on the signal from the beacon receiver 11. (S16).

When it is determined that the reception intensity of the radio wave is not equal to or higher than the predetermined value (S16: NO), the process proceeds to step S11. On the other hand, when the reception intensity of the radio wave is equal to or higher than a predetermined value (S16: YES), the notification processing unit 14c determines that the danger level is high and executes the notification processing. As a result, the approach warning notification is sent from the voice output unit 13 (S17). After that, the process shown in FIG. 5 ends.

In this way, according to the transport vehicle on-board unit 10 according to the present embodiment, in order to receive the signal from the beacon transmitter 30 held by the worker W outside the vehicle and acquire the information on the reception strength thereof, The degree of approach of the worker W can be known. Further, since the movement information indicating the presence / absence of the movement of the transport vehicle TV is acquired, the presence / absence of the movement of the transport vehicle TV can be considered. Therefore, by determining the danger level based on this information and notifying it, it is not necessary to equip the transport vehicle TV with sonar and radar in each direction, and it is possible to collide with the worker W while suppressing the complexity of the configuration. The sex can be reduced.

Further, when the reception intensity information shows the intensity of the predetermined value or more, the danger level is judged to be high and the notification process is performed, while the transport vehicle even when the reception intensity information shows the intensity of the predetermined value or more. If the movement of the TV is not confirmed, it is judged that the danger level is not high and notification processing is prohibited. Therefore, even if the worker W collides with the transport vehicle TV when the transport vehicle TV is stopped. If there is no possibility of a collision from the TV side of the transport vehicle, the notification process can be prohibited and the notification can be made appropriate.

In addition, when the reception intensity information shows an intensity equal to or higher than a predetermined value, it is determined that the danger level is high and notification processing is performed. When it is judged that the visibility is secured, it is judged that the danger level is not high and it is prohibited to perform the notification processing, so the danger level is high when the visibility when carrying the transported object called the transport vehicle TV deteriorates. It will be judged that the notification will be made, and the notification can be made appropriate.

Further, according to the notification system 1 according to the present embodiment, information on the location where the notification processing is performed is collected by the plurality of transport vehicle on-board units 10, and the individual transport vehicle on-board units 10 are located at the collected locations. Since the notification process is performed in advance based on the information, the location where the notification process was frequently performed in the past is notified to the crew member C of the transport vehicle TV in advance, and the possibility of collision with the worker W can be further reduced. ..

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and changes may be made without departing from the spirit of the present invention. May be combined.

For example, in the present embodiment, the transport vehicle TV is assumed to be a forklift, but the present invention is not limited to this, and other types of transport vehicle TV such as a bulldozer, a truck, or an all-terrain vehicle may be used.

Further, in the present embodiment, the movement information acquisition unit 14b acquires the movement information based on the signal from the speed detection unit 12, but the movement information is acquired by using other means such as GPS radio waves. You may.

In addition, the determination of forward movement and backward movement is made based on the presence or absence of a back signal, but the determination is not limited to this, and forward movement and backward movement may be determined based on the vehicle speed pulse, and GPS radio waves or the like may be used. Then, it may be determined whether the vehicle is moving forward or backward.

Further, in the present embodiment, it has been described that the possibility of collision with the worker W is reduced, but the present invention is not limited to this, and the possibility of collision with other moving objects may be reduced.

1: Notification system 10: On-board unit of transport vehicle 14a: Reception strength acquisition unit (reception strength acquisition means)
14b: Movement information acquisition unit (movement information acquisition means)
14c: Notification processing unit (notification processing means)
14d: Image information acquisition unit (image information acquisition means)
14e: Visual field judgment unit (visual field judgment means)
17: Storage unit (memory means)
18: Communication unit (communication means)
20: Server 30: Beacon transmitter (signal transmission terminal)
TV: Transport vehicle W: Worker (moving body)

Claims (4)

It is a transport vehicle on-board unit mounted on the transport vehicle.
A reception strength acquisition means for acquiring information on the reception strength of a signal from a signal transmission terminal held by a moving body outside the vehicle, and a reception strength acquisition means.
A movement information acquisition means for acquiring movement information indicating the presence or absence of movement of the transport vehicle, and
The reception strength acquisition means, the notification processing means that determines the danger level based on the information acquired by the movement information acquisition means, and performs the notification processing.
A transport vehicle on-board unit characterized by being equipped with. The notification processing means has a danger level when the reception strength information acquired by the reception strength acquisition means indicates a strength equal to or higher than a predetermined value and the movement of the transport vehicle is confirmed by the movement information acquisition means. Is determined to be high, notification processing is performed, and even when the reception strength information acquired by the reception strength acquisition means shows a strength equal to or higher than a predetermined value, the movement of the transport vehicle is confirmed by the movement information acquisition means. The transport vehicle on-board unit according to claim 1, wherein if this is not done, it is determined that the danger level is not high and the notification processing is prohibited. An image information acquisition means for acquiring information on a captured image obtained by imaging the surroundings of the transport vehicle, and
Further provided with a field of view determining means for determining whether or not a field of view exceeding a specified value can be secured by the transported object in the transport vehicle based on the information of the captured image acquired by the image information acquiring means.
The notification processing means has the visibility when the reception strength information acquired by the reception strength acquisition means shows an intensity equal to or higher than a predetermined value and the movement of the transport vehicle is confirmed by the movement information acquisition means. When the visibility above the specified value cannot be secured by the determination means, it is determined that the danger level is high and notification processing is performed, and the reception intensity information acquired by the reception intensity acquisition means indicates an intensity equal to or higher than a predetermined value. Moreover, even when the movement of the transport vehicle is confirmed by the movement information acquisition means, the danger level is not high if it is determined by the visibility determination means that the visibility equal to or higher than the specified value can be secured. The transport vehicle on-board unit according to claim 2, wherein the notification processing is prohibited by determination. The transport vehicle on-board unit according to any one of claims 1 to 3.
A notification system including a plurality of servers capable of communicating with the on-board unit of the transport vehicle.
The plurality of on-board units of the transport vehicle transmit the storage means for storing the information of the place where the notification processing is performed by the notification processing means and the information of the place stored by the storage means to the server, respectively. Further equipped with communication means,
The server collects information on the location transmitted by the communication means of the plurality of on-board units of the transport vehicle, determines a dangerous area based on the collected information on the location, and feeds back.
A notification system, wherein the notification processing means of each of the transport vehicle on-board units performs notification processing in advance based on the information of the dangerous area fed back by the server.

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