JP6753998B2 - Vehicle network system and vehicle reversal position detection method - Google Patents

Description

The present invention relates to the detection of the reverse position of a vehicle in a vehicle network system configured by connecting each vehicle forming a train with an IP network.

In the train monitoring system, the driver or crew checks the safety of passengers by visually checking the passengers moving on the platform, and controls the opening and closing of the doors. Passenger footage is captured by cameras installed on the vehicle body or on the platform. For example, in Japan, a system that uses a camera installed on a platform to display an image on a monitor of the platform or a monitor of a train cab is common. On the other hand, in the United Kingdom, for example, a system that displays an image on a monitor in the driver's cab by using a camera installed on the side surface of the vehicle body is common. These differences are due to the difference in whether train operations and infrastructure are managed by the same or different operators.
In the following, an in-vehicle camera type train monitoring system in which a camera is installed in the vehicle body will be referred to. For example, Patent Document 1 discloses a train monitoring system in which cameras are arranged adjacent to each door of a vehicle.

International Publication No. 2015/145736

In train monitoring systems, real-time performance is required to monitor passenger safety, so analog systems that do not cause delays have been used with priority. However, in recent years, advances in IP technology have made low-delay transmission possible, and all devices have come to be connected to IP networks. One advantage of the IP system is that the IP technology allows the devices to be connected with a single cable, which reduces the cost of the cable. Moreover, not only video data but also other information such as alarm information and train information can be transmitted with a single cable. Images taken by a plurality of cameras are encoded by each camera, transmitted to a monitor via an IP network, decoded by the monitor, and displayed separately.

When a camera is installed on the side of each vehicle, the installation position of the camera changes depending on the configuration of the vehicle. This is because when mass-producing vehicles with different camera installation positions on the right side and left side, the vehicles are manufactured with the same configuration and orientation, and when these vehicles are connected, the orientation reverses at a certain position. Is.
Specifically, as illustrated in FIG. 1, the vehicle V1 which is the first car, the vehicle V2 which is the second car, and the vehicle V4 which is the fourth car and the vehicle V3 which is the third car are manufactured with the same configuration and orientation. Then, when trying to connect them, the direction of the vehicle is reversed with the connecting portion between the vehicle V2 and the vehicle V3 as a boundary. That is, assuming that the vehicles V1 and V2 are facing forward, the vehicles V3 and V4 are connected backward. As a result, the positional relationship between the cameras installed on one side surface (A side) of each vehicle and the cameras installed on the other side surface (B side) is as follows: two vehicles V1 and V2 in front and two vehicles V3 and V4 in the rear. Is the opposite.

A case where this reversal becomes a problem is the case where all the camera images provided on the open side of the door of each vehicle are displayed in order to monitor passengers when the train is stopped. FIG. 2 shows an example in which camera images of each vehicle are collectively displayed on a monitor whose screen is divided into four when the door on the right side is opened with the vehicle V1 side as the traveling direction of the train. As shown in FIG. 2, the images of the camera (A side) may be displayed for the two vehicles V1 and V2 on the front side in the traveling direction, but the two vehicles V3 and V4 on the rear side in the traveling direction may be displayed with the inverted position as a boundary. Needs to display the image of the camera (B side).
For this reason, the central device of the train monitoring system needs to grasp the configuration of the vehicle and recognize at which position the direction of the vehicle is reversed to operate.

In some railway systems, it is possible to recognize at which position the direction of the vehicle is reversed by receiving the vehicle configuration information from the host system that manages the vehicle configuration. As a higher-level system, for example, there is a TMS (Train Management System). However, few trains have TMS, and there is a demand for a mechanism for detecting the reversal of the direction of a vehicle without such a system.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to enable automatic detection of a reverse position of a vehicle in a vehicle network system configured by connecting a plurality of vehicles. And.

In order to achieve the above object, the vehicle network system and the vehicle reversal position detection method according to the present invention are configured as follows.
(1) A vehicle network system configured by connecting network repeaters installed for each of a plurality of vehicles, and provided with a detection device that detects the inverted position of the vehicle by communicating with the network repeaters of each vehicle. The network repeater has a plurality of ports for connecting to other devices, and the detection device has an address value for identifying the network repeater from the network repeater of each vehicle and the network repeater. The network of adjacent vehicles that acquires the address value of another network repeater connected to the network and the port number that identifies the port used for the connection, and is specified from each acquired address value and port number. It is a vehicle network system characterized in that the inverted position of a vehicle is detected based on the relationship of ports used for connection between repeaters.

(2) In the vehicle network system described in (1) above, cameras provided on both sides of each vehicle, a monitor for displaying images taken by the cameras of each vehicle, and a display for controlling the display of the monitors. The display control unit includes a control unit, and the display control unit selects a camera to acquire an image based on the inverted position of the vehicle detected by the detection device, and displays the image taken by the camera on the monitor. It is a characteristic vehicle network system.

(3) A vehicle reversal position detection method for detecting a vehicle reversal position in a vehicle network system configured by connecting network repeaters installed for each of a plurality of vehicles, wherein the network repeater is another device. A detection device having a plurality of ports for connecting to and communicably connected to the network repeater of each vehicle has an address value for identifying the network repeater from the network repeater of each vehicle, and the network. An adjacent vehicle that acquires the address value of another network repeater connected to the repeater and the port number that identifies the port used for the connection, and is specified from each acquired address value and port number. It is a vehicle reversal position detection method characterized in that the reversal position of a vehicle is detected based on the relationship of ports used for connection between network repeaters of the above.

According to the present invention, it is possible to automatically detect the inverted position of a vehicle in a vehicle network system configured by connecting a plurality of vehicles.

It is a figure which shows the schematic structure example of a train. It is a figure which shows the split display example of a camera image. It is a figure which shows the configuration example of the vehicle network system which concerns on one Embodiment of this invention. It is a figure which shows the connection example of the switching hub in the vehicle network system of FIG. It is a figure which shows the example of the MAC address table in the vehicle network system of FIG. It is a figure which shows the example of the processing sequence about the collection of MAC address in the vehicle network system of FIG. It is a figure which shows the example of the processing sequence about the reverse position check of a vehicle in the vehicle network system of FIG. FIG. 3 is a diagram showing an example of a processing sequence related to control of start / end of camera image display in the vehicle network system of FIG. FIG. 3 is a diagram showing an example of a processing sequence related to identification of a camera image to be displayed in the vehicle network system of FIG.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 3 shows a configuration example of a vehicle network system having a vehicle reversal position detection function. In this example, a vehicle network system for a vehicle traveling on a railroad track will be described as an example, but another vehicle network system such as a vehicle network system for a vehicle traveling on a monorail may be used. In the vehicle network system of this example, a switching hub (SW) and a camera are installed in each vehicle, and these are connected by an IP network. In addition, one central processing unit (CPU) is provided in the train. The central device is a device that comprehensively controls the vehicle network system, and has a function of detecting the inverted position of the vehicle.

A switching hub 11, a camera (A side) 12, a camera (B side) 13, a central device 14, and a monitor 15 connected to the switching hub 11 are installed in the vehicle V1 which is the first car. The vehicle V2, which is the second car, is equipped with a switching hub 21, a camera (A side) 22 and a camera (B side) 23 connected to the switching hub 21. A switching hub 31, a camera (A side) 32 and a camera (B side) 33 connected to the switching hub 31 are installed in the vehicle V3 which is the third car. A switching hub 41, a camera (A side) 42 and a camera (B side) 43 connected to the switching hub 41 are installed in the vehicle V4 which is the fourth car.

The switching hubs of adjacent vehicles (11 and 21, 21 and 31, 31 and 41) are connected by network cables, respectively. That is, a communication network is constructed in the train by connecting each switching hub of each vehicle in a string.
The cameras 12, 13, ..., 42, 43 are installed on the outer surface of the vehicle so as to photograph the vicinity of the door of the vehicle, for example. In this example, a DOO (Driver Only Operation) camera, which is a kind of IP camera, is used, but other cameras may be used.
In this example, the monitor is provided only in the vehicle V1 having the driver's cab (or the crew's room), but it may be provided in another vehicle (for example, the vehicle V4) in which the driver's cab or the like is provided. Further, in this example, the central device is provided only in the vehicle V1, but it may be provided in other vehicles for multiplexing.

FIG. 4 shows a connection example of a switching hub.
Since each vehicle is manufactured with the same configuration, the port of the switching hub connecting each vehicle is fixed. In this example, the vehicles are connected using the port P1 which is the first port and the port P2 which is the second port of each switching hub. Further, the port P1 is used for connecting to the vehicle on the front side, and the port P2 is used for connecting to the vehicle on the rear side. The "front side" here means the front side (vehicle V1, V4 side) in the state before connecting the vehicles V1 and V2 and the vehicles V3 and V4 (see the left side of FIG. 1), and means the "rear side". "" Means the opposite side. That is, in the connection between the vehicle V1 and the vehicle V2, the port P2 of the switching hub 11 of the vehicle V1 on the front side and the port P1 of the switching hub 21 of the vehicle V2 on the rear side are connected. Similarly, in the connection between the vehicle V3 and the vehicle V4, the port P2 of the switching hub 41 of the vehicle V4 on the front side and the port P1 of the switching hub 31 of the vehicle V3 on the rear side are connected.

When the switching hubs of each vehicle are connected according to such a rule, the switching ports of the vehicles are connected to each other using the ports having the same number in the portion where the direction of the vehicle is reversed. In FIG. 4, the switching hub 21 of the vehicle V2 and the switching hub 31 of the vehicle V3 are both connected by using the port P2.

As illustrated in FIG. 5, different MAC addresses (Media Access Control addresses) are assigned to the switching hubs of each vehicle. Further, each switching hub has a MAC address table that manages the MAC addresses of opposite devices (other devices connected to the switching hub) for each port.

In the example of FIG. 5, the MAC address of the switching hub of the vehicle V2 is recorded in the "port P2" of the MAC address table of the switching hub of the vehicle V1, and the "port" of the MAC address table of the switching hub of the vehicle V2 is recorded. The MAC address of the switching hub of the vehicle V1 is recorded in "P1". Further, the MAC address of the switching hub of the vehicle V3 is recorded in the "port P2" of the MAC address table of the switching hub of the vehicle V4, and the MAC address of the switching hub of the vehicle V3 is recorded in the "port P1" of the MAC address table of the switching hub of the vehicle V3. The MAC address of the switching hub of the vehicle V4 is recorded. That is, in the MAC address table of each switching hub of the vehicle whose orientation is not reversed, the MAC addresses of each other are recorded in different port columns.

On the other hand, the MAC address of the switching hub of the vehicle V3 is recorded in the "port P2" of the MAC address table of the switching hub of the vehicle V2, and the "port P2" of the MAC address table of the switching hub of the vehicle V3 is recorded. The MAC address of the switching hub of the vehicle V2 is recorded in. That is, in the MAC address table of each switching hub of the vehicle whose orientation is reversed, the MAC addresses of each other are recorded in the same port column.

FIG. 6 shows an example of a processing sequence related to MAC address collection.
First, the central device 14 transmits a MAC address request to the switching hub of the vehicle V1 (step S11), and in response to this, receives the MAC address transmitted from the switching hub of the vehicle V1 (step S12). Next, the MAC address table request is transmitted to the switching hub of the vehicle V1 (step S13), and in response to this, the MAC address table transmitted from the switching hub of the vehicle V1 is received (step S14). The MAC address and MAC address table can be acquired by using SNMP (Simple Network Management Protocol) or LLDP (Link Layer Discovery Protocol).
Similarly, the central device 14 sequentially accesses the switching hubs of the vehicles V2, V3, and V4, and acquires the MAC address and the MAC address table from each switching hub (steps S21 to S44).
When the central device 14 finishes acquiring the MAC address and the MAC address table from all the switching hubs, the central device 14 checks the reverse position of the vehicle (step S60).

FIG. 7 shows an example of a processing sequence related to the reverse position check of the vehicle.
In the reverse position check, first, it is determined whether or not the switching hubs of adjacent vehicles are connected to each other by using the port P1. That is, it is determined whether the vehicle V2 is connected to the port P1 of the switching hub of the vehicle V1 and the vehicle V1 is connected to the port P1 of the switching hub of the vehicle V2 (step S61). If the determination result is Yes, the area between the vehicle V1 and the vehicle V2 is detected as the vehicle reversal position (step S62). The same determination is made for the vehicle V2 and the vehicle V3, and the vehicle V3 and the vehicle V4 (steps S63 to S66).

Next, it is determined whether the switching hubs of the adjacent vehicles are connected to each other by using the port P2. That is, it is determined whether the vehicle V2 is connected to the port P2 of the switching hub of the vehicle V1 and the port P2 is connected to the second port of the switching hub of the vehicle V2 (step S67). If the determination result is Yes, the area between the vehicle V1 and the vehicle V2 is detected as the vehicle reversal position (step S68). The same determination is made for the vehicle V2 and the vehicle V3, and the vehicle V3 and the vehicle V4 (steps S69 to S72).

That is, in the reverse position check, the switching hubs of adjacent vehicles search for a combination in which the MAC addresses of each other are recorded on the ports having the same number. Then, when the corresponding combination is found, it is determined that the directions are reversed between the vehicles.
As described above, the vehicle network system of this example can detect the vehicle reversal position only by examining the connection configuration between the switching hubs of each vehicle.
In this inversion position check, there may be a plurality of cases where the determination result is Yes. This is because when many vehicles are connected, there may be a plurality of vehicle reversal positions. Therefore, by preparing a plurality of variables having information on the vehicle reversal position, it is possible to manage a plurality of vehicle reversal positions. The same determination logic as described above can be used as the determination logic in this case.

Next, the control of the camera image display in the vehicle network system of this example will be described. FIG. 8 shows an example of a processing sequence relating to control of start / end of camera image display.
The cameras 12, 13, ..., 42, 43 of each vehicle can control the start and stop of video distribution via the network. Further, the monitor 15 acquires and stores the information of the image cutout frame of each camera and the control information of the divided display from the central device 14 at the start of the train operation, and controls the divided display based on the information. .. The divided display control information includes information on the divided format of the display area of the monitor, information on the display number that identifies each divided area, and the like. Further, it is assumed that the central device 14 knows in advance the relationship with the position of the side surface of the vehicle body determined at the time of manufacturing the cameras 12 and 13. As an example, there is discrimination by IP address, where the fourth octet of the IP address is "1" (for example, 10.0.0.1) as the left side and "2" (for example, 10.0.0). .2) is the right side.

The central device 14 determines whether or not the train has stopped at the station based on the speed of the train (step S101). For example, by determining whether the speed of the train is equal to or higher than the predetermined speed or lower than the predetermined speed, it is possible to determine whether or not the train has stopped at the station. As the predetermined speed, for example, 3 km / h can be used, but the speed is not limited to this, and any speed that can determine whether or not the train is stopped may be used.
When the central device 14 determines in step S101 that the train is stopped at the station, the central device 14 determines whether or not the door of the vehicle is open (step S102).

When the central device 14 determines in step S102 that the door of the vehicle is open, the central device 14 transmits a command to start displaying an image to the monitor 15 (step S103). At this time, the central device 14 provides train traveling direction information indicating whether the traveling direction of the train is the vehicle V1 side or the vehicle V4 side, entry / exit information indicating whether the side where the door opens is the right side or the left side of the vehicle, and the reverse position of the vehicle. The indicated vehicle reversal position information is transmitted to the monitor 15 simultaneously or continuously.
The monitor 15 divides and displays the camera images captured by the plurality of cameras in response to receiving the command to start the image display from the central device 14 (step S104). After that, the process returns to step S101 and the process is repeated.

Further, when the central device 14 determines in step S101 that the train has not stopped at the station, or when it determines in step S102 that the vehicle door is not open, the central device 14 commands the monitor 15 to stop displaying the image. Is transmitted (step S105). If the video display has not started, nothing needs to be done. After that, the process returns to step S101 and the process is repeated.

Here, the vehicle network system of this example considers the arrangement of each camera image on the monitor and divides the display in such a manner that the driver or the crew can easily recognize the monitoring area corresponding to each camera image. Do. As an example, the camera images are arranged on the monitor 15 by the logic of allocating the camera images in the order along the traveling direction of the train from the upper left to the lower right of the monitor.

Hereinafter, the identification of the camera image to be divided and displayed in step S104 will be described. FIG. 9 shows an example of a processing sequence relating to the identification of the camera image. Here, a case where the display area of the monitor 15 is divided into four and a camera image of a 4-car train is displayed will be described as an example. Further, the minimum vehicle number is "1", the maximum vehicle number is "4", and the vehicle reversal position is "3".

The monitor 15 acquires train traveling direction information, boarding / alighting gate information, and vehicle reversal position information transmitted from the central device 14 at the time of commanding the start of video display (step S121).
Next, the monitor 15 determines whether the traveling direction of the train is the vehicle V1 side (vehicle No. 1 direction) or the vehicle V4 side (vehicle No. 4 direction) based on the train traveling direction information (step S122).

When the traveling direction of the train is on the vehicle V1 side, the minimum vehicle number is set in the variable X and the vehicle reversal position is set in the variable Y (step S123). In this example, the variable X is set to "1" and the variable Y is set to "3".
Next, it is determined whether the side where the door opens is the right side or the left side based on the entrance / exit information (step S124). When the door on the right side opens, the camera image on the A side is used for the vehicle with X <Y, and the camera image on the B side is used for the vehicle with X ≧ Y (step S125). When the left door opens, the camera image on the B side is used for the vehicle with X <Y, and the camera image on the A side is used for the vehicle with X ≧ Y (step S126).
Next, the value of the variable X is added by 1 (step S127), and it is determined whether X> the maximum vehicle number (step S128). If X> the maximum vehicle number, the process returns to step S124, and if X> the maximum vehicle number, the process ends.

When the traveling direction of the train is not on the vehicle V1 side (in the case of the vehicle V4 side), the maximum vehicle number is set in the variable X and the vehicle reversal position is set in the variable Y (step S129). In this example, the variable X is set to "4" and the variable Y is set to "3".
Next, it is determined whether the side where the door opens is the right side or the left side based on the entrance / exit information (step S130). When the door on the right side opens, the camera image on the B side is used for the vehicle with X <Y, and the camera image on the A side is used for the vehicle with X ≧ Y (step S131). When the left door opens, the camera image on the A side is used for the vehicle with X <Y, and the camera image on the B side is used for the vehicle with X ≧ Y (step S132).
Next, the value of the variable X is subtracted by 1 (step S133), and it is determined whether X <minimum vehicle number (step S134). If X <minimum vehicle number, the process returns to step S130, and if X <minimum vehicle number, the process ends.

This makes it possible to specify the camera image to be divided and displayed. The processing flow described above is only an example, and the camera image to be divided and displayed can be specified by various other methods.
For example, in the above description, the monitor 15 specifies the camera image, but the central device 14 may specify the camera image. Further, in the above description, the camera image is specified when the image is displayed, but the camera image used when the right door opens and the camera image used when the left door opens are specified in advance. May be good.

Further, in the above description, a train having one reverse position of the vehicle is given as an example, but the reverse position of the vehicle may be a plurality of places. In this case, for example, a plurality of inverted positions are specified according to the processing sequence of FIG. 7, and the door is opened while switching between the camera image on the A side and the camera image on the B side with each inverted position as a boundary. You just have to identify the camera image on the side.

As described above, in this example, the vehicle network system is configured by connecting the switching hubs (11, 21, 31, 41) installed for each of a plurality of vehicles (V1 to V4). The vehicle network system includes a central device (14) that communicates with the switching hub of each vehicle to detect the inverted position of the vehicle. The relationship of ports used for connection between switching hubs of adjacent vehicles differs depending on whether the adjacent vehicles are in the same orientation or in the opposite orientation. Then, the central device identifies the MAC address that identifies the switching hub, the MAC address of another switching hub connected to the switching hub, and the port used for the connection from the switching hub of each vehicle. And are acquired, and the inverted position of the vehicle is detected based on the relationship of the ports used for the connection between the switching hubs of the adjacent vehicles, which is specified from each acquired MAC address and port number.

That is, which port is between the switching hubs of each vehicle, based on the assumption that the relationship of the ports used for connection between the switching hubs of the adjacent vehicles is different depending on whether the adjacent vehicles are in the same direction or in the opposite direction. It is a mechanism to detect the reverse position of the vehicle by checking whether it is connected using. With such a configuration, the inverted position of the vehicle in the train can be automatically detected.

In this example, in the connection of each switching hub of the adjacent vehicle, it is assumed that the port P1 is used for the connection with the front vehicle and the port P2 is connected according to the rule used for the connection with the rear vehicle. However, the switching hubs of these vehicles may be connected according to other connection rules that can determine whether adjacent vehicles are in the same orientation, but not limited to this.

Further, in the vehicle network system of this example, cameras (12, 13, ..., 42, 43) provided on both sides of each vehicle and a monitor (15) for displaying images taken by the cameras of each vehicle. ), The monitor is configured to select a camera to acquire an image based on the inverted position of the vehicle detected by the central device, and display the image taken by the camera on the monitor. More specifically, the monitor identifies cameras provided on the side where the door is opened for each vehicle based on the inverted position of the vehicle detected by the central device, and displays images captured by these cameras. It is configured as.
As a result, in a train in which the rolling stock is inverted on the way, the camera image of each rolling stock on the side where the door is opened can be displayed on the monitor.

In this example, the network repeater according to the present invention is realized by a switching hub (11, 21, 31, 41), the detection device according to the present invention is realized by a central device (14), and the display control unit according to the present invention is realized. Is realized by the monitor (15).
Here, the configurations of the system, the device, and the like according to the present invention are not necessarily limited to those shown above, and various configurations may be used. For example, the display control unit according to the present invention may be realized by the central device (14).

Further, in the above example, the inverted position of the vehicle is detected and used for specifying the camera image used for the divided display, but the inverted position of the vehicle may be used for other purposes. As an example, the speaker used for in-vehicle broadcasting may be controlled according to the inverted position of the vehicle. Specifically, in a configuration in which speakers are installed on both sides inside each vehicle, in-vehicle broadcasting is performed using only the speaker on the side where the door opens, or the side where the door opens is the speaker rather than the side where the door does not open. You may control so that the volume of is increased.

Further, the present invention can be provided, for example, as a method or method for executing the process according to the present invention, a program for realizing such a method or method, a storage medium for storing the program, or the like.
As an example, the central device may be realized by executing a predetermined program on a computer having hardware resources such as a processor and memory. That is, for example, a central device may be realized by a computer processor reading a program stored in a data storage device such as a hard disk or a flash memory into the memory and executing the program.

The present invention can be used in various vehicle network systems configured by connecting network repeaters installed for each vehicle forming a train.

V1 to V4: Vehicle, 11,21,31,41: Switching hub, 12,13,22,23,32,33,42,43: Camera, 14: Central device, 15: Monitor

Claims (3)

It is a vehicle network system configured by connecting network repeaters installed for each of a plurality of vehicles.
Equipped with a detection device that detects the inverted position of the vehicle by communicating with the network repeater of each vehicle.
The network repeater has a plurality of ports for connecting to other devices.
From the network repeater of each vehicle, the detection device obtains an address value for identifying the network repeater, the address value of another network repeater connected to the network repeater, and a port used for the connection. Acquires the port number to be identified, and detects the inverted position of the vehicle based on the relationship of the ports used for connection between the network repeaters of adjacent vehicles, which is specified from each acquired address value and port number. A vehicle network system characterized by In the vehicle network system according to claim 1,
Cameras on both sides of each vehicle
A monitor that displays the images taken by the cameras of each vehicle,
It is provided with a display control unit that controls the display of the monitor.
The display control unit selects a camera to acquire an image based on the inverted position of the vehicle detected by the detection device, and displays the image taken by the camera on the monitor. .. It is a vehicle reversal position detection method that detects the reversal position of a vehicle in a vehicle network system configured by connecting network repeaters installed for each of a plurality of vehicles.
The network repeater has a plurality of ports for connecting to other devices.
The detection device communicably connected to the network repeater of each vehicle identifies the network repeater from the network repeater of each vehicle, and the address value of the other network repeater connected to the network repeater. A port used for connection between network repeaters of adjacent vehicles, which is specified from each acquired address value and port number by acquiring the address value and a port number that identifies the port used for the connection. A vehicle reversal position detection method, characterized in that the reversal position of the vehicle is detected based on the relationship between the two.

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