Network topology architecture and method for high data transmission security and data fusion

Abstract

The invention discloses a network topology architecture with high data transmission security and data fusion. The network topology architecture comprises a first ring network and a second ring network, control data, audio and video data and maintenance data of equipment mounted on n switches contained in a train can be transmitted; when the data type is control data, transmission is carried out in the two looped networks; when the data type is audio and video data or maintenance data, transmission is carried out only in any ring network, and when the data type of the network topology architecture is control data, transmission is carried out in the first ring network and the second ring network at the same time; when the data type of the network topology architecture is audio / video transmission or data maintenance, data transmission is carried out only in any ring network; and when the control data is transmitted in the first ring network and the second ring network at the same time, preferentially adopting the control data of the ring network which only transmits the control data to perform vehicle control, and when any one of the first ring network and the second ring network has a fault, adopting the control data of the ring network which does not have the fault to perform vehicle control.

Description

Technical Field

[0001] The present invention belongs to the field of fully automated products and relates to a network topology architecture and method with high data transmission security and data fusion. Background Art

[0002] The network communication bus is a carrier for transmitting communication data and is the basis for the vehicle controller to realize control functions. With the rapid development of technology and the needs of user experience and operational services, vehicles must not only realize control functions, but also have audio and video services. This requires the vehicle bus to be able to transmit not only control data, but also audio and video data with large bandwidth requirements. This places higher requirements on the selection of the bus and the design of the network topology architecture.

[0003] Existing vehicle control bus technologies include MVB bus, CAN bus, 485 bus, etc. All of the above buses can transmit control data, but MVB bus, CAN bus, and 485 bus can only transmit control data with small data volume due to their small bandwidth. Vehicles based on Ethernet bus communication are more efficient and flexible multi-unit vehicles, which effectively avoid the shortcomings of small bus bandwidth and low communication rate of other vehicles. The maintainability and safety are higher than those of traditional vehicle control buses. Ethernet bus, due to its large bandwidth, can not only transmit control data but also be compatible with the transmission of audio and video data, achieving the function of being compatible with the intranet of audio and video equipment, and can realize the unified planning of vehicle communication and audio and video network topology, simplify vehicle network topology, reduce cable laying and the use of cross-vehicle connectors, and achieve the purpose of reducing costs and improving maintainability.

[0004] The existing multi-unit vehicle bus consists of two parts. One part is the vehicle control bus, which is composed of MVB buses. The MVB buses between vehicles are connected by repeaters with waveform shaping functions. The equipment of a single vehicle is connected to the MVB bus through a standard MVBEMD interface. Due to its small bandwidth (1.5Mbps), it can only transmit control data. The other part is the audio and video bus, which is composed of an Ethernet bus. The network between vehicles is built through switches and Ethernet cables. The audio and video equipment of a single vehicle is connected to the Ethernet bus through the Ethernet port to realize the function of transmitting audio and video data. The two buses are physically independent of each other.

[0005] Disadvantages of existing technology

[0006] 1) The MVB bus has low bandwidth and poor scalability, and can no longer meet the needs of large amounts of vehicle control data and flexible expansion in the future;

[0007] 2) The MVB bus is physically independent from the audio and video bus, the physical transmission medium cannot be shared, the vehicle network topology is complex, the cable laying is difficult, and it is not convenient for electrical design and subsequent use and maintenance.

[0008] 3) The MVB bus redundancy mode is two pairs of line redundancy within a cable. If the cable is disconnected due to external force, the entire network will be disconnected. Summary of the invention

[0009] In order to solve the problems that the existing multi-train communication network and audio and video network are independent of each other, occupy a large number of cables and cross-train connectors, have poor maintainability, and are inflexible in network expansion, and considering the characteristics of the vehicle communication network that have high requirements for stability and reliability, the technical solution adopted by the present invention is:

[0010] A network topology architecture with high data transmission security and data fusion, including:

[0011] The first ring network and the second ring network;

[0012] The first ring network and the second ring network have the same structure; both can transmit control data, audio and video data, and maintenance data of the equipment mounted on the n switches included in the train;

[0013] When the data type is control data, it is transmitted in both ring networks;

[0014] When the data type is audio and video data or maintenance data, it is transmitted only in any one of the ring networks.

[0015] Furthermore: the n switches achieve data isolation of control data, audio and video data, and maintenance data through VLAN division, network slicing, and time division multiplexing methods.

[0016] Furthermore: both the first ring network and the second ring network adopt a Gigabit TSN network.

[0017] Furthermore: the subsystem control device for controlling data is respectively connected to the first ring network and the second ring network through two Ethernet interfaces, and the audio and video terminal device only needs to have one Ethernet port.

[0018] Furthermore: the subsystem control device includes a traction control unit, a braking control unit, an auxiliary control unit, an air conditioning control unit, a door control unit, and a passenger information system.

[0019] Furthermore: among the n switches of the first ring network and the second ring network, there is at least one three-layer managed switch, and the three-layer managed switch has at least the functions of VLAN division, port aggregation, port flow control, port speed limit, three-layer switching, three-layer routing, three-layer multicast, and ring network protocol.

[0020] Furthermore: the control data contents of the devices on the n switches of the first ring network and the second ring network, including the refresh cycle, signal quantity, name, definition, byte offset, bit offset, and data type are all consistent.

[0021] A multi-train network topology includes: n switches, Ethernet cables and various subsystem devices;

[0022] The switch is used for bus data forwarding and network management;

[0023] Ethernet cables are used to connect n switches to build bus data transmission lines, forming the first ring network and the second ring network;

[0024] Each subsystem device is connected to the first ring network and the second ring network through the Ethernet interface to achieve isolated transmission of control data, audio and video data, and maintenance data.

[0025] A transmission method based on a network topology architecture with high data transmission security and data fusion, comprising the following steps;

[0026] Get the data type of the network topology architecture.

[0027] When the data type of the network topology architecture is control data, it is transmitted simultaneously in the first ring network and the second ring network;

[0028] When the data type of the network topology is to transmit audio and video or maintenance data, data transmission is only carried out in any one of the ring networks;

[0029] When control data is transmitted in the first ring network and the second ring network at the same time, the control data of the ring network that only transmits control data is preferentially used for vehicle control.

[0030] When there is a fault in either the first ring network or the second ring network, the control data of the ring network without the fault is used to control the vehicle.

[0031] Furthermore, when the control data is transmitted in the first ring network and the second ring network at the same time, the control data of the ring network that transmits only the control data is preferentially used to control the vehicle, and the process is as follows:

[0032] 1) The two Ethernet ports of the subsystem device are configured with different IP addresses to identify the ring network to which the Ethernet port is connected;

[0033] 2) When the first ring network is agreed to be a ring network that only transmits control data, each device receives and sends control data for vehicle control through the Ethernet port connected to the first ring network, and the control data of the second ring network is used as a backup;

[0034] 3) When the second ring network is agreed to be a ring network that only transmits control data, each device sends and receives control data for vehicle control through the Ethernet port connected to the second ring network, and the control data of the first ring network is used as a backup;

[0035] When there is a fault in either the first ring network or the second ring network, the process of using the control data of the ring network without the fault to control the vehicle is as follows:

[0036] Each packet of control data contains a life signal, which increases in each sending cycle. When the life signal in the control data does not increase for n consecutive cycles, it is determined that the control data transmission in the ring network is interrupted, that is, there is a fault in the ring network. Then each device uses the control data packet backed up in another ring network to control the vehicle.

[0037] The present invention proposes a network topology architecture, which can solve the problems existing in the above-mentioned existing network topology architectures while ensuring the stability and reliability of the communication network.

[0038] The present invention can effectively avoid the shortcomings of existing vehicle control bus technologies including MVB, CAN, 485, etc., such as single bus topology, low information transmission speed, poor networking flexibility, limited throughput capacity, etc. At the same time, on the basis of ensuring reliable and secure transmission of vehicle control data, it realizes the transmission of vehicle audio and video data, cancels the intranet of vehicle audio and video equipment, realizes the simplification and unified management of vehicle network topology, reduces vehicle design and construction costs, and improves later maintainability and stability.

[0039] The present invention has the following advantages and benefits:

[0040] 1) Improving the bandwidth of the vehicle bus to meet future vehicle control requirements; since the bus topology proposed by the present invention has a larger bandwidth, more data can be transmitted, which means that more functions can be realized, so that the design of vehicle functions is not limited by the bus's data transmission capacity;

[0041] 2) Simplify the vehicle topology, and no longer arrange a set of buses for each system separately. From the perspective of vehicle electrical design, the vehicle principle can be simplified; from the perspective of line laying, the number of cables and cross-vehicle connectors can be reduced; from the perspective of later maintenance, unified management of vehicle equipment can be achieved, and maintainability can be improved; from the perspective of scalability, the application solution has strong later scalability and a simple method. Communication can be achieved by connecting to the vehicle switch through an Ethernet cable and then configuring the software;

[0042] 3) Improve the security of vehicle control data, allowing up to three points of physical failure (switch failure or cable disconnection), and also ensure the safe and reliable transmission of vehicle control data.

[0043] The network architecture and method are applicable to the field of multi-unit vehicle control in rail transit, and are also applicable to similar multi-unit control systems in other fields. The architecture is implemented through an Ethernet dual-ring network and a device with an Ethernet interface mounted on the ring network; the data transmission method provided by the present invention is implemented by transmitting control data in two ring networks at the same time, and audio and video data and maintenance data in one of the ring networks, that is, one of the ring networks only transmits control data, and the other ring network transmits both control data and audio and video and maintenance data. When the ring network that only transmits control data is normal, each vehicle controller preferentially uses the control data of the ring network to control the vehicle. When the ring network fails and its control data cannot pass through all control devices, all control devices use the control data of the other ring network to control the vehicle, thereby achieving a high safety and reliability effect of vehicle control data. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 is the architecture diagram of the network of this application;

[0046] Figure 2 It is a network topology diagram of multiple train sets.

[0047] Figure numerals: 1. First Gigabit Ethernet between vehicles, 2. Second Gigabit Ethernet between vehicles, 3. Third Gigabit Ethernet between vehicles, 4. 1-vehicle switch of the first ring network, 5. 2-vehicle switch of the first ring network, 6. n-vehicle switch of the first ring network, 7. 1-vehicle control device, 8. 1-vehicle audio and video device, 9. First vehicle-level 100M Ethernet, 10. Second vehicle-level 100M Ethernet, 11. Third vehicle-level 100M Ethernet. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Figure 1 is the architecture diagram of the network of this application;

[0051] A network topology architecture with high data transmission security and data fusion, including:

[0052] The first ring network and the second ring network;

[0053] The first ring network and the second ring network have the same structure, and the first ring network and the second ring network have the same cable, switch selection, and physical networking methods; both can transmit control data, audio and video data, and maintenance data of the devices mounted on the n switches included in the train;

[0054] When the data type is control data, it is transmitted in both ring networks;

[0055] When the data type is audio and video data or maintenance data, it is transmitted only in any one of the ring networks.

[0056] The first ring network includes: a first Gigabit Ethernet 1 between vehicles, a second Gigabit Ethernet 2 between vehicles, a third Gigabit Ethernet 3 between vehicles, a switch 4 for vehicle 1, a switch 5 for vehicle 2, and a switch 6 for vehicle n;

[0057] A second Gigabit Ethernet between vehicles is arranged between the 1-car switch 4 of the first ring network and the 2-car switch 5 of the first ring network, a third Gigabit Ethernet 3 between vehicles is arranged between the 2-car switch 5 of the first ring network and the n-car switch 6 of the first ring network, a first Gigabit Ethernet 1 between vehicles is arranged between the 1-car switch 4 of the first ring network and the n-car switch 6 of the first ring network, a first vehicle-level 100M Ethernet 9 between vehicles is arranged between the 1-car control device 7 and the 1-car switch 4 of the first ring network, a second vehicle-level 100M Ethernet 10 between vehicles is arranged between the 1-car control device 7 and the 1-car switch of the second ring network, and a second vehicle-level 100M Ethernet 10 between vehicles is arranged between the 1-car audio and video device 8 and the 1-car switch of the second ring network; other vehicles of the first ring network and the second ring network have the same arrangement as the first ring network and the second ring network;

[0058] The audio and video data includes audio data and video data;

[0059] The audio data includes broadcast station announcement audio, holiday greeting audio, prompt voice audio, etc.;

[0060] The video data includes camera video, etc.;

[0061] Maintenance data includes data on upgrading software and downloading device logs for each control device.

[0062] The control data: control data flow between the central control unit, remote IO module, human-machine interface, data recorder, traction control unit, auxiliary control unit, brake control unit, main door control unit, passenger information system, air conditioning control unit, signal control unit, electrical cabinet monitoring host, and running gear detection host;

[0063] The first ring network and the second ring network have the same functions. One of the ring networks (the first ring network) is only responsible for transmitting control data; the other ring network (the second ring network) is not only responsible for transmitting control data, but also for transmitting audio and video data and maintenance data (the first ring network can also transmit control / audio and video / maintenance data, and the second ring network can transmit control data, with no prescribed order). Different VLANs are divided by switches to achieve data isolation. At the same time, control data is guaranteed to have high priority to ensure high availability of vehicle control functions.

[0064] Data transmission principle: One ring network transmits only control data and only allows access to subsystem devices with control data; the other ring network transmits control data and audio and video data and allows access to devices with control data and audio and video devices; control data and audio and video data are isolated through VLAN division and data priority setting;

[0065] Principles for selecting control data: The control data content of the two ring networks, including refresh cycle, signal quantity, name, definition, byte offset, bit offset, data type, etc., are consistent. When the network is normal, each vehicle controller will give priority to using the ring network data with only control data to realize the vehicle control function. When the control ring fails, the backup control data of the other ring network will be used to realize the vehicle control function;

[0066] When the network is normal, each vehicle controller will give priority to using the ring network data with only control data to realize the vehicle control function, which is realized through the software of each controller;

[0067] The control ring refers to a ring network that only transmits control data;

[0068] Regarding the security and availability of control data, the architecture provided by the present invention allows up to three physical failures, and even if there are three physical failures in the physical line (switch failure or cable disconnection), the transmission of control data will not be affected, thus ensuring that the control function of the vehicle is completed;

[0069] The terminal equipment is directly connected to the ring network switch of the vehicle, and is not aggregated through the subsystem intranet switch and then connected to the ring network switch; the terminal equipment participating in the vehicle control should have two Ethernet ports, which are respectively connected to the switches of the two ring networks; the audio and video terminal equipment only needs to have one Ethernet port, which is connected to one of the ring networks, but it should be ensured that all audio and video terminal equipment are in the same ring network (the second ring network);

[0070] The first ring network and the second ring network both use Gigabit TSN network. The n switches use network slicing and time division multiplexing methods to achieve data isolation of control data, audio and video data, and maintenance data, ensuring real-time transmission of control data. The bus bandwidth of MVB / CAN / 485 does not exceed 2 megabits;

[0071] The subsystem device for controlling data is respectively connected to the first ring network and the second ring network through two Ethernet ports.

[0072] Because a single-point failure in the first ring network will not cause a data link interruption, control data can be transmitted through the second ring network even if a double-point failure occurs. In addition, the second ring network can also tolerate single-point failures, so this architecture can tolerate up to 3-point failures in the control data link, greatly improving the availability of the vehicle bus network. Subsystem devices with audio and video data are only connected to the second ring network. Because the existing audio and video devices are networked separately, the architecture can greatly reduce the number and difficulty of cable laying, as well as the number of cross-vehicle connectors, thereby reducing costs and simplifying the vehicle network topology.

[0073] Among the n switches of the first ring network and the second ring network, there is at least one three-layer managed switch, and the three-layer managed switch has at least the functions of VLAN division, port aggregation, port flow control, port speed limit, three-layer switching, three-layer routing, three-layer multicast, and ring network protocol.

[0074] The number of ports of the switch can be selected according to demand, but the design should take into account the demand for later expansion and reserve a 20% margin;

[0075] A multi-train vehicle network topology is characterized by comprising: n switches, Ethernet cables and various subsystem devices;

[0076] The switch is used for bus data forwarding and network management;

[0077] Ethernet cables are used to connect n switches to build bus data transmission lines, forming the first ring network and the second ring network;

[0078] Each subsystem device is connected to the first ring network and the second ring network through an Ethernet interface to achieve isolated transmission of control data, audio and video data, and maintenance data. The network topology architecture and method of the present invention include two independent physical networks, the vehicle and the inter-vehicle network are dual-ring networks, namely the first ring network and the second ring network, and the subsystem device is connected to the ring network through an Ethernet port; the vehicle bus is an Ethernet bus, the vehicle-to-vehicle network bandwidth of the ring network that only transmits control data is not less than 100 megabits, and the vehicle-to-vehicle network bandwidth of the ring network that transmits control data and audio and video data is not less than 1 gigabit;

[0079] The network topology of multi-unit vehicles includes switches, Ethernet cables, and subsystem devices. The switches are responsible for bus data forwarding and network management (VLAN division, data priority management, port rate management, etc.). The Ethernet cables are responsible for building bus data transmission lines. Each subsystem device is connected to the Ethernet bus as a terminal node through the Ethernet cable.

[0080] A transmission method based on a network topology architecture with high data transmission security and data fusion, comprising the following steps;

[0081] S1: Get the data type of the network topology architecture.

[0082] S2: When the data type of the network topology architecture is control data, it is transmitted simultaneously in the first ring network and the second ring network;

[0083] When the data type of the network topology is to transmit audio and video or maintenance data, data transmission is only carried out in any one of the ring networks;

[0084] When control data is transmitted in the first ring network and the second ring network at the same time, the control data of the ring network that only transmits control data is preferentially used for vehicle control.

[0085] When any one of the first ring network and the second ring network fails and its control data cannot pass through all control devices, the control data of the ring network without the failure is used to control the vehicle.

[0086] A transmission method based on a network topology architecture with high data transmission security and data fusion, wherein when control data is transmitted simultaneously in a first ring network and a second ring network, the control data of the ring network that only transmits control data is preferentially used to control the vehicle, and the process is as follows:

[0087] 1) The two Ethernet ports of the subsystem device are configured with different IP addresses to identify the ring network to which the Ethernet port is connected;

[0088] 2) When the first ring network is agreed to be a ring network that only transmits control data, each device receives and sends control data for vehicle control through the Ethernet port connected to the first ring network, and the control data of the second ring network is used as a backup;

[0089] 3) When the second ring network is agreed to be a ring network that only transmits control data, each device sends and receives control data for vehicle control through the Ethernet port connected to the second ring network, and the control data of the first ring network is used as a backup;

[0090] When there is a fault in either the first ring network or the second ring network, the process of using the control data of the ring network without the fault to control the vehicle is as follows:

[0091] Each packet of control data contains a life signal, which increases in each sending cycle. When the life signal in the control data does not increase for n consecutive cycles, it is determined that the control data transmission in the ring network is interrupted, that is, there is a fault in the ring network. Then each device uses the control data packet backed up in another ring network to control the vehicle.

[0092] Embodiment 1: All subsystems with Ethernet ports in multi-train vehicles realize real-time Ethernet communication through real-time Ethernet point-to-point access. The vehicle-to-vehicle network and vehicle network adopt redundant transmission mechanism. Each subsystem and vehicle network are connected by two Ethernet interfaces to ensure that single point failure will not affect the normal operation of the vehicle. The data communication rate of the trunk Ethernet bus is not less than 1000Mbit / s, and the TSN time-division sensitive network is adopted to ensure the real-time nature of the data.

[0093] The control units of each subsystem connected to the Ethernet bus include: traction control unit, brake control unit, auxiliary control unit, air conditioning control unit, door control unit, passenger information system, etc. All subsystems have ETH (M12 D_Code) electrical interfaces. The vehicle control and monitoring system has standard communication interfaces for all subsystem devices and has mature and reliable interface communication specifications, so that all vehicle subsystems can be reliably connected.

[0094] The dual ring network uses Ethernet bus redundant transmission. The specific network topology is as follows: Figure 2 As shown, Figure 2 The abbreviations and full names are shown in Table 1 below:

[0095] Table 1: Abbreviations and full names

[0096] Abbreviation Full name TCMS Vehicle Network Control System ES switch TSN Time-Sensitive Networking CCU Central Control Unit HMI Human Machine Interface Unit RIOM Input and output interface unit ERM Data logger HVAC Air conditioning control system EDCU Electronic door control unit DCU Traction control unit ETH Ethernet bus PIS Passenger Information Display System VIDEO Audio and video data

[0097] The blue device is a control device, which is connected to two ring networks through dual network ports and sends consistent control data to the two networks at the same time, forming a control data backup effect. The yellow device is an audio and video device, which is connected to one of the ring networks through a network port and transmits audio and video data in it. In the second ring network, the control data and audio and video data are divided into different VLANs through the switch to achieve data isolation and ensure the security of the control data. If some control devices, such as the human-machine interface unit HMI, want to access audio and video data, they can achieve cross-VLAN access through the routing function of the three-layer switch.

[0098] As above Figure 2 In the three-car train, two central control units CCU are the main devices of the network control system. They serve as hot standby for each other during operation to realize the management of bus communication.

[0099] The vehicle network control system TCMS uses network communication with various vehicle devices; vehicle devices refer to: traction control system, brake control system, auxiliary control system, air conditioning control system HVAC, passenger information display system PIS, and vehicle doors;

[0100] Subsystems with Ethernet bus ETH interface, such as traction control system, brake control system, auxiliary control system, air conditioning control system HVAC, passenger information display system PIS, door control system, etc. are directly connected to TCMS through the ETH bus.

[0101] The devices with a blue background in the topology diagram are control devices, which mainly realize vehicle control functions.

[0102] The devices with yellow background are audio and video devices, which mainly realize the audio and video entertainment service functions of the vehicle;

[0103] The device with orange background is a switch, which mainly realizes the functions of data forwarding and signal relay;

[0104] The blue line is a Gigabit Ethernet cable, which together with the switch forms a Gigabit bandwidth vehicle-to-vehicle network. The pink line is a 100M Ethernet cable, which mainly realizes the connection and data communication between subsystem devices and switches.

[0105] Switches, Ethernet cables, and terminal devices connected to Ethernet. The switches and terminal devices mentioned above (the terminal devices involved in vehicle control) support TSN functions.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A network topology architecture with high data transmission security and data fusion, characterized by: include: The first ring network and the second ring network; The first ring network and the second ring network have the same structure; They can all transmit control data, audio and video data, and maintenance data of the equipment mounted on n switches contained in the train; When the data type is control data, it is transmitted in both ring networks; When the data type is audio and video data or maintenance data, it is transmitted only in any one of the ring networks.

2. A network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: The n switches achieve data isolation of control data, audio and video data, and maintenance data through VLAN division, network slicing, and time division multiplexing methods.

3. A network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: Both the first ring network and the second ring network use Gigabit TSN network.

4. The network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: The subsystem control device for controlling data is respectively connected to the first ring network and the second ring network through two Ethernet interfaces, and the audio and video terminal device only needs to have one Ethernet port.

5. The network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: The subsystem control devices include a traction control unit, a brake control unit, an auxiliary control unit, an air conditioning control unit, a door control unit, and a passenger information system.

6. A network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: Among the n switches of the first ring network and the second ring network, there is at least one three-layer managed switch, and the three-layer managed switch has at least the functions of VLAN division, port aggregation, port flow control, port speed limit, three-layer switching, three-layer routing, three-layer multicast, and ring network protocol.

7. The network topology architecture with high data transmission security and data fusion according to claim 1, characterized in that: The control data contents of the devices on the n switches of the first ring network and the second ring network, including refresh cycle, signal quantity, name, definition, byte offset, bit offset, and data type, are consistent.

8. A multi-train network topology, characterized in that: Including: n switches, Ethernet cables and various subsystem equipment; The switch is used for bus data forwarding and network management; Ethernet cables are used to connect n switches to build bus data transmission lines, forming the first ring network and the second ring network; Each subsystem device is connected to the first ring network and the second ring network through the Ethernet interface to achieve isolated transmission of control data, audio and video data, and maintenance data.

9. A transmission method based on a network topology architecture with high data transmission security and data fusion, characterized in that: The steps include: Get the data type of the network topology architecture. When the data type of the network topology architecture is control data, it is transmitted simultaneously in the first ring network and the second ring network; When the data type of the network topology is to transmit audio and video or maintenance data, data transmission is only carried out in any one of the ring networks; When control data is transmitted in the first ring network and the second ring network at the same time, the control data of the ring network that only transmits control data is preferentially used for vehicle control. When there is a fault in either the first ring network or the second ring network, the control data of the ring network without the fault is used to control the vehicle.

10. A transmission method based on a network topology architecture with high data transmission security and data fusion, characterized in that: When the control data is transmitted in the first ring network and the second ring network at the same time, the control data of the ring network that only transmits the control data is preferentially used to control the vehicle, and the process is as follows: 1) The two Ethernet ports of the subsystem device are configured with different IP addresses to identify the ring network to which the Ethernet port is connected; 2) When the first ring network is agreed to be a ring network that only transmits control data, each device receives and sends control data for vehicle control through the Ethernet port connected to the first ring network, and the control data of the second ring network is used as a backup; 3) When the second ring network is agreed to be a ring network that only transmits control data, each device sends and receives control data for vehicle control through the Ethernet port connected to the second ring network, and the control data of the first ring network is used as a backup; When there is a fault in either the first ring network or the second ring network, the process of using the control data of the ring network without the fault to control the vehicle is as follows: Each packet of control data contains a life signal, which increases in each sending cycle. When the life signal in the control data does not increase for n consecutive cycles, it is determined that the control data transmission in the ring network is interrupted, that is, there is a fault in the ring network. Then each device uses the control data packet backed up in another ring network to control the vehicle.

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