Network control system for train and train

Abstract

The invention provides a network control system for a train and the train, and can be applied to the technical field of train network communication. The system comprises a first switch which comprises a first processor, a first sub-switch chip and a second sub-switch chip, the first sub-switch chip and the second sub-switch chip are connected in series through a first bus, and the first processor and the first sub-switch chip are connected in series through a second bus, the first switch processes the network signal through the first processor; and the network signal transmitting unit is connected with a port of the first sub-switch chip and is used for transmitting a network signal to the first processor through the first sub-switch chip, so that the first processor processes the network signal and then transmits the network signal to a traction system of a train.

Description

Technical Field

[0001] The present disclosure relates to the technical field of train network communications, and more particularly, to a network control system for a train and a train. Background Art

[0002] During the operation of the train, the driver controller can be used to control the train's movement. For example, the driver controller can be used to control the train's forward or backward movement, or to control the train's acceleration or deceleration. The driver controller's control signal can be sent to the train's traction system through the switch.

[0003] In the process of realizing the concept of the present disclosure, the inventors found that there are at least the following problems in the related art: In the related art, the train may fail to be towed, which affects the operation of the train. Summary of the invention

[0004] In view of this, the present disclosure provides a network control system for a train and a train.

[0005] One aspect of the present disclosure provides a network control system for a train, comprising:

[0006] The first switch includes a first processor, a first sub-switch chip and a second sub-switch chip, wherein the first sub-switch chip and the second sub-switch chip are connected in series through a first bus, the first processor and the first sub-switch chip are connected in series through a second bus, and the first switch processes network signals through the first processor;

[0007] The network signal sending unit is connected to the port of the first sub-switch chip and is used to transmit the network signal to the first processor through the first sub-switch chip, so that the first processor processes the network signal and sends it to the traction system of the train.

[0008] According to an embodiment of the present disclosure, the network signal sending unit includes a driver controller and a dynamic host configuration protocol server, and the network signal includes a train control signal and a dynamic address signal;

[0009] The driver controller is connected to the port of the first sub-switch chip and is used to send a train control signal to the first switch, so that the first processor processes the train control signal and sends it to the traction system of the train;

[0010] The dynamic host configuration protocol server is connected to the port of the first sub-switch chip and is used to send a dynamic address signal to the first switch, so that the first processor processes the dynamic address signal and then sends it to the traction system of the train.

[0011] According to an embodiment of the present disclosure, the system further includes: a second switch;

[0012] The second switch includes a second processor, a third sub-switch chip and a fourth sub-switch chip, the third sub-switch chip and the fourth sub-switch chip are connected in series through a third bus, the second processor and the third sub-switch chip are connected in series through a fourth bus, and the second switch processes network data through the second processor;

[0013] Among them, the above-mentioned network signal sending unit is connected to the port of the above-mentioned third sub-switch chip, and is used to transmit the network signal to the above-mentioned first processor through the above-mentioned third sub-switch chip, so that the above-mentioned second processor processes the above-mentioned network signal and sends it to the traction system of the above-mentioned train.

[0014] According to an embodiment of the present disclosure, the driver controller is connected to the port of the third sub-switch chip, and is used to send the train control signal to the second switch, so that the second processor processes the train control signal and sends it to the traction system of the train;

[0015] The dynamic host configuration protocol server is connected to the port of the third sub-switch chip, and is used to send a dynamic address signal to the second switch, so that the second processor processes the dynamic address signal and sends it to the traction system of the train.

[0016] According to an embodiment of the present disclosure, the first processor is further configured to:

[0017] Monitoring the first bus to determine a first state of the first bus;

[0018] When it is determined that the first state indicates that the first bus is in a fault state, a first reset instruction is generated.

[0019] According to an embodiment of the present disclosure, after it is determined that the first processor executes the first reset instruction and the first bus is in a fault state, first alarm information is generated.

[0020] According to an embodiment of the present disclosure, the second processor is further configured to:

[0021] monitoring the third bus to determine a second state of the third bus;

[0022] When it is determined that the second state indicates that the third bus is in a fault state, a second reset instruction is generated.

[0023] According to an embodiment of the present disclosure, after it is determined that the second processor executes the second reset instruction and the second bus is in a fault state, second alarm information is generated.

[0024] According to an embodiment of the present disclosure, the first processor is further configured to: monitor the second bus to determine a third state of the second bus; and generate third alarm information when it is determined that the third state indicates that the second bus is in a fault state;

[0025] The second processor is further configured to: monitor the fourth bus to determine a fourth state of the fourth bus; and generate fourth alarm information when it is determined that the fourth state indicates that the fourth bus is in a fault state.

[0026] Another aspect of the present disclosure provides a train, comprising the above-mentioned network control system for a train.

[0027] According to an embodiment of the present disclosure, the network signal sending unit is connected to the port of the first sub-switch chip, and the network signal can be transmitted to the first processor through the first sub-switch chip for processing and sent to the traction system of the train, thereby avoiding the problem of the network signal being unable to be transmitted to the traction system due to a failure of the first bus, reducing the impact of the switch on the train, and ensuring the operation of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of a network control system for a train in the related art is schematically shown;

[0030] Figure 2 A block diagram of a network control system for a train according to an embodiment of the present disclosure is schematically shown;

[0031] Figure 3 A schematic diagram of a network control system for a train according to an embodiment of the present disclosure is schematically shown;

[0032] Figure 4 A schematic diagram schematically shows a connection diagram of a first switch, a controller and a dynamic host configuration protocol server according to an embodiment of the present disclosure; and

[0033] Figure 5 A schematic diagram of a train according to an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0035] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0036] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0037] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0038] Figure 1 The figure schematically shows a network control system for a train in the related art.

[0039] like Figure 1 As shown, the switch 110 in the control system 100 of the train is usually connected to other systems 120 of the train through ports. In actual operation, it is found that the train cannot be towed after changing ends. After checking the network system of the train, it is found that the health indicators of all connection ports on the switch are green, indicating that there is no fault. Using a cable analyzer to detect, all network cables are fine, and the traction system, driver controller, dynamic host configuration protocol server, etc. are all working normally, but the driver controller cannot obtain an IP address, cannot send data normally, and the traction system cannot receive signals from the driver controller.

[0040] Through the connection ports of the switch controller and the dynamic host configuration protocol server on the switch, it was found that the reason for the inability to pull the signal was that there was a network interruption inside the switch. The switch includes two switch chips, which are connected by a bus. One of the switch chips transmits signals through the other switch chip. In the event of a connection bus failure, the signal of the switch chip that transmits signals through the other switch chip cannot be transmitted.

[0041] In view of this, the present disclosure provides a network control system for a train, including: a first switch, including a first processor, a first sub-switch chip and a second sub-switch chip, the first sub-switch chip and the second sub-switch chip are connected in series through a first bus, the first processor and the first sub-switch chip are connected in series through the second bus, and the first switch processes network signals through the first processor; a network signal sending unit, connected to the port of the first sub-switch chip, for transmitting network signals to the first processor through the first sub-switch chip, so that the first processor processes the network signal and sends it to the traction system of the train.

[0042] The current switch port redundancy design does not avoid the occurrence of this single point failure.

[0043] Figure 2 A block diagram of a network control system for a train according to an embodiment of the present disclosure is schematically shown.

[0044] like Figure 2 As shown, the network control system 200 for a train includes a first switch 210 and a network signal sending unit 220 .

[0045] The first switch 210 includes a first processor 211, a first sub-switch chip 212 and a second sub-switch chip 213. The first sub-switch chip 212 and the second sub-switch chip 213 are connected in series through a first bus 214. The first processor 211 and the first sub-switch chip 212 are connected in series through a second bus 215. The first switch 210 processes network signals through the first processor 211.

[0046] The network signal sending unit 220 is connected to the port of the first sub-switch chip 212 and is used to transmit the network signal to the first processor 211 through the first sub-switch chip 212, so that the first processor 211 processes the network signal and sends it to the traction system of the train.

[0047] According to an embodiment of the present disclosure, the first switch can be connected to other devices through the port of the first sub-switch chip or the second sub-switch chip, and there is no connection between the second sub-switch chip and the first processor. Therefore, when a signal is received through the port of the second sub-switch chip, it needs to be transmitted to the first sub-switch chip through the first bus, and then transmitted to the first processor through the second bus for processing.

[0048] In the event of a failure in the first bus, signal transmission cannot be performed between the first sub-switch chip and the second sub-switch chip, which results in the port of the second sub-switch chip being unable to transmit signals normally. However, the port of the first sub-switch chip can transmit signals normally. If the port of the second sub-switch chip is connected to an important network signal sending unit, it will affect the operation of the train.

[0049] Therefore, in order to avoid affecting the train operation due to the failure of the first bus, the network signal sending unit is connected to the port of the first sub-switch chip, so that the network signal can be transmitted to the first processor through the first sub-switch chip for processing and sent to the traction system of the train.

[0050] According to an embodiment of the present disclosure, the network signal sending unit is connected to the port of the first sub-switch chip, and the network signal can be transmitted to the first processor through the first sub-switch chip for processing and sent to the traction system of the train, thereby avoiding the problem of the network signal being unable to be transmitted to the traction system due to a failure of the first bus, reducing the impact of the switch on the train, and ensuring the operation of the train.

[0051] According to an embodiment of the present disclosure, the network signal sending unit includes a controller and a dynamic host configuration protocol server, and the network signal includes a train control signal and a dynamic address signal; wherein, the controller is connected to the port of the first sub-switch chip, and is used to send the train control signal to the first switch, so that the first processor processes the train control signal and sends it to the traction system of the train; the dynamic host configuration protocol server is connected to the port of the first sub-switch chip, and is used to send the dynamic address signal to the first switch, so that the first processor processes the dynamic address signal and sends it to the traction system of the train.

[0052] According to an embodiment of the present disclosure, the network signal sending unit may include a driver controller and a dynamic host configuration protocol server, wherein the driver controller can send train control signals to the train, such as forward, reverse, traction, braking and other signals, and the dynamic host configuration protocol server can send dynamic address signals to the train.

[0053] According to the embodiments of the present disclosure, since the train control signal and the dynamic address signal are both relatively important signals in the train operation process, if the transmission is not timely, it will affect the train operation. Therefore, the driver controller and the dynamic host configuration protocol server can be used as network signal sending units and connected to the port of the first sub-switch chip.

[0054] According to an embodiment of the present disclosure, the controller is connected to the port of the first sub-switch chip, and the train control signal can be transmitted to the first sub-switch chip through the port of the first sub-switch chip, and then transmitted to the first processor through the first bus.

[0055] According to an embodiment of the present disclosure, the dynamic host configuration protocol server is connected to the port of the first sub-switch chip, and the dynamic address signal can be transmitted to the first sub-switch chip through the port of the first sub-switch chip, and then transmitted to the first processor through the first bus.

[0056] According to an embodiment of the present disclosure, by connecting the driver and the dynamic host configuration protocol server to the port of the first sub-switch chip, the train control signal and the dynamic address signal can be transmitted to the first processor through the second bus. The first processor can send the dynamic address signal to the traction system of the train after processing, thereby avoiding the problem of the first bus failing and causing the signal to be unable to be effectively transmitted when the dynamic host configuration protocol server is connected to the port of the second sub-switch chip.

[0057] According to an embodiment of the present disclosure, the system also includes: a second switch; wherein the second switch includes a second processor, a third sub-switch chip and a fourth sub-switch chip, the third sub-switch chip and the fourth sub-switch chip are connected in series through a third bus, the second processor and the third sub-switch chip are connected in series through the fourth bus, and the second switch processes network data through the second processor; wherein the network signal sending unit is connected to the port of the third sub-switch chip, and is used to transmit the network signal to the first processor through the third sub-switch chip, so that the second processor processes the network signal and sends it to the traction system of the train.

[0058] According to an embodiment of the present disclosure, the second switch can serve as a redundant connection of the first switch. In the event of a failure in the first switch, signal transmission can be performed through the second switch, or, in the event of a failure in the second switch, signal transmission can be performed through the first switch, thereby improving the stability of the train network control system.

[0059] According to an embodiment of the present disclosure, the controller is connected to the port of the third sub-switch chip, and is used to send a train control signal to the second switch, so that the second processor processes the train control signal and sends it to the traction system of the train; the dynamic host configuration protocol server is connected to the port of the third sub-switch chip, and is used to send a dynamic address signal to the second switch, so that the second processor processes the dynamic address signal and sends it to the traction system of the train.

[0060] According to an embodiment of the present disclosure, the controller is connected to the port of the third sub-switch chip, and the train control signal can be transmitted to the third sub-switch chip through the port of the third sub-switch chip, and then transmitted to the second processor through the fourth bus.

[0061] According to an embodiment of the present disclosure, the dynamic host configuration protocol server is connected to the port of the third sub-switch chip, and the dynamic address signal can be transmitted to the third sub-switch chip through the port of the third sub-switch chip, and then transmitted to the second processor through the fourth bus.

[0062] According to the embodiment of the present disclosure, by connecting the driver and the dynamic host configuration protocol server to the port of the third sub-switch chip, the train control signal and the dynamic address signal can be transmitted to the second processor through the fourth bus, and the second processor can send the dynamic address signal to the traction system of the train after processing it, avoiding the problem that the third bus fails and the signal cannot be effectively transmitted when the dynamic host configuration protocol server is connected to the port of the fourth sub-switch chip. In addition, the driver and the dynamic host configuration protocol server both consider redundant connections to avoid the problem that the signal cannot be transmitted due to a different network link.

[0063] According to an embodiment of the present disclosure, the first processor is further configured to: monitor the first bus to determine a first state of the first bus; and generate a first reset instruction when it is determined that the first state indicates that the first bus is in a fault state.

[0064] According to an embodiment of the present disclosure, when it is determined that the first bus is in a fault state after the first processor executes the first reset instruction, first alarm information is generated.

[0065] According to an embodiment of the present disclosure, the port of the second sub-switch chip in the first switch may be connected to some signals with less impact on train operation, such as train video. In order to ensure the state of the first bus, the first bus may be monitored to determine the first state of the first bus. The first buses of the first sub-switch chip and the second sub-switch chip may be monitored through program instructions.

[0066] According to an embodiment of the present disclosure, when the first bus is in a fault state, a first reset instruction can be generated by the first processor, and the first reset instruction can be used to reset the first bus. After the first processor issues the first reset instruction, the state of the first bus can continue to be monitored. If the first bus is still not in a fault state, a first alarm message can be generated to inform the maintenance personnel of the train so that timely maintenance can be carried out.

[0067] According to the embodiments of the present disclosure, by monitoring the first bus, the status of the first bus can be timely known and reset to avoid continuous failure of the first bus and affect the operation of the train. In the event of unsuccessful reset, a first alarm message is generated to enable the maintenance personnel of the train to promptly know the fault status of the first bus.

[0068] According to an embodiment of the present disclosure, the second processor is further configured to: monitor the third bus to determine a second state of the third bus; and generate a second reset instruction when it is determined that the second state indicates that the third bus is in a fault state.

[0069] According to an embodiment of the present disclosure, when it is determined that the second bus is in a fault state after the second processor executes the second reset instruction, second alarm information is generated.

[0070] According to an embodiment of the present disclosure, the port of the fourth sub-switch chip in the second switch may be connected to some signals with less impact on train operation, such as train video. In order to ensure the state of the third bus, the third bus may be monitored to determine the second state of the third bus. The third buses of the third sub-switch chip and the fourth sub-switch chip may be monitored through program instructions.

[0071] According to an embodiment of the present disclosure, when the third bus is in a fault state, a second reset instruction can be generated by the second processor, and the second reset instruction can be used to reset the third bus. After the second processor executes the first reset instruction, the state of the third bus can continue to be monitored. If the third bus is still not in a fault state, a second alarm message can be generated to inform the train maintenance personnel so that timely repairs can be carried out.

[0072] According to the embodiments of the present disclosure, by monitoring the third bus, the status of the third bus can be timely known and reset to avoid continuous failure of the third bus and affect the operation of the train. In the event of unsuccessful reset, a second alarm message is generated to enable the train maintenance personnel to promptly know the fault status of the third bus.

[0073] According to an embodiment of the present disclosure, the first processor is further configured to: monitor the second bus to determine a third state of the second bus; and generate third alarm information when it is determined that the third state indicates that the second bus is in a fault state.

[0074] The second processor is further configured to: monitor the fourth bus to determine a fourth state of the fourth bus; and generate fourth alarm information when it is determined that the fourth state indicates that the fourth bus is in a fault state.

[0075] In order to ensure the first switch, the first processor can also be used to monitor the second bus. Since the port of the first sub-switch chip is connected to the network signal sending unit, untimely or incorrect signal transmission will affect the operation of the train. Therefore, in the case of a fault in the second bus, the third alarm information needs to be generated in time. The same is true for the fourth bus in the second switch.

[0076] According to the embodiments of the present disclosure, by monitoring the second bus in the first switch and the fourth bus in the second switch, the buses inside the switches are fully monitored to avoid problems affecting train operation due to switch bus failures.

[0077] Figure 3 A schematic diagram of a network control system for a train according to an embodiment of the present disclosure is schematically shown.

[0078] like Figure 3 As shown, the controller 311 and the dynamic host configuration protocol server 312 are connected to both the first switch 320 and the second switch 330 , and the first switch 320 and the second switch 330 are connected to the traction system 340 .

[0079] According to an embodiment of the present disclosure, Figure 3 The network architecture at one end of the train is shown in FIG. 1 , and the network architecture at the other end of the train is the same, which will not be described in detail here. The specific connection ports of the driver controller 311 and the dynamic host configuration protocol server 312 and the first switch 320 and the second switch 330 can be referred to in FIG. Figure 4 .

[0080] Figure 4 The figure schematically shows a connection diagram between the first switch, the controller and the dynamic host configuration protocol server according to an embodiment of the present disclosure.

[0081] like Figure 4As shown, the first switch 410 includes a first processor 411, a first sub-switch chip 412 and a second sub-switch chip 413. The first sub-switch chip 412 and the second sub-switch chip 413 are connected in series via a first bus 414. The first processor 411 and the first sub-switch chip 412 are connected in series via a second bus 415. The first sub-switch chip 412 includes ports 1 to 6, and the second sub-switch chip 413 includes ports 7 to 12. Port 2 of the first sub-switch chip 412 is connected to the controller 420, port 4 of the first sub-switch chip 412 is connected to the dynamic host configuration protocol server 430, and port 8 of the second sub-switch chip 413 is connected to the video.

[0082] The second switch, the controller and the dynamic host configuration protocol server can refer to Figure 4 , no longer elaborated here, the controller may include two network cards, one network card is connected to the first switch, and the other network card is connected to the second switch.

[0083] Figure 5 A schematic diagram of a train according to an embodiment of the present disclosure is schematically shown.

[0084] like Figure 5 As shown, a train 500 includes a network control system 510 for a train provided by an embodiment of the present disclosure.

[0085] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present disclosure can be combined and / or combined in a variety of ways, even if such a combination or combination is not explicitly recorded in the present disclosure. In particular, without departing from the spirit and teaching of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0086] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A network control system for a train, include: A first switch, comprising a first processor, a first sub-switch chip and a second sub-switch chip, wherein the first sub-switch chip and the second sub-switch chip are connected in series through a first bus, the first processor and the first sub-switch chip are connected in series through a second bus, and the first switch processes network signals through the first processor; A network signal sending unit is connected to the port of the first sub-switch chip and is used to transmit the network signal to the first processor through the first sub-switch chip, so that the first processor processes the network signal and sends it to the traction system of the train.

2. The system according to claim 1, in, The network signal sending unit includes a driver controller and a dynamic host configuration protocol server, and the network signal includes a train control signal and a dynamic address signal; The driver controller is connected to the port of the first sub-switch chip, and is used to send a train control signal to the first switch, so that the first processor processes the train control signal and sends it to the traction system of the train; The dynamic host configuration protocol server is connected to the port of the first sub-switch chip, and is used to send a dynamic address signal to the first switch, so that the first processor processes the dynamic address signal and sends it to the traction system of the train.

3. The system according to claim 2, further comprising: include: Second switch; The second switch includes a second processor, a third sub-switch chip and a fourth sub-switch chip, the third sub-switch chip and the fourth sub-switch chip are connected in series through a third bus, the second processor and the third sub-switch chip are connected in series through a fourth bus, and the second switch processes network data through the second processor; The network signal sending unit is connected to the port of the third sub-switch chip, and is used to transmit the network signal to the first processor through the third sub-switch chip, so that the second processor processes the network signal and sends it to the traction system of the train.

4. The system according to claim 3, in, The driver controller is connected to the port of the third sub-switch chip, and is used to send the train control signal to the second switch, so that the second processor processes the train control signal and sends it to the traction system of the train; The dynamic host configuration protocol server is connected to the port of the third sub-switch chip, and is used to send a dynamic address signal to the second switch, so that the second processor processes the dynamic address signal and sends it to the traction system of the train.

5. The system according to any one of claims 1 to 4, in, The first processor is further configured to: Monitoring the first bus to determine a first state of the first bus; In the case where it is determined that the first state indicates that the first bus is in a fault state, a first reset instruction is generated.

6. The system according to claim 5, in, After determining that the first processor executes the first reset instruction, if the first bus is in a fault state, first alarm information is generated.

7. The system according to claim 3 or 4, in, The second processor is further configured to: monitoring the third bus to determine a second state of the third bus; In the case where it is determined that the second state indicates that the third bus is in a fault state, a second reset instruction is generated.

8. The system according to claim 7, in, After determining that the second processor executes the second reset instruction and the second bus is in a fault state, second alarm information is generated.

9. The system according to claim 3 or 4, in, The first processor is further configured to: monitor the second bus to determine a third state of the second bus; and generate third alarm information when it is determined that the third state indicates that the second bus is in a fault state; The second processor is further configured to: monitor the fourth bus to determine a fourth state of the fourth bus; and generate fourth alarm information when it is determined that the fourth state indicates that the fourth bus is in a fault state.

10. A train, include: Traction system; A network control system as claimed in any one of claims 1 to 9.

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