CN112887152A - Train communication network architecture and method based on Ethernet and rail train - Google Patents
Train communication network architecture and method based on Ethernet and rail train Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
- H04L41/0836—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability to enhance reliability, e.g. reduce downtime
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Abstract
The invention provides a train communication network architecture based on Ethernet, comprising: ethernet is organized into a network; an ethernet train backbone comprising: the network comprises a first network plane and a second network plane which are mutually independent in physical layer, wherein the first network plane and the second network plane share one Ethernet grouping network; the first network plane and the second network plane are respectively connected with two Ethernet train backbone network nodes in series in each train, each Ethernet train backbone network node is provided with an ETBN switch, and the ETBN switches are connected with the Ethernet marshalling network. The invention also provides a train communication method adopting the network architecture and a rail train. The train communication network architecture, the train communication network method and the rail train provided by the invention can effectively reduce the number of the nodes and the number of messages in the initial operation of the train, reduce the influence of fault points on the operation of the train, and ensure the safety and reliability of the operation of the train.
Description
Technical Field
The invention belongs to the technical field of train network communication of motor train units, and particularly relates to a train communication network architecture and method based on Ethernet and a rail train.
Background
With the popularization and application of the ethernet in the field of trains, a large bandwidth, a high speed, intelligent transmission and other technologies are promoted for a rail vehicle-mounted network, the functions of dynamic cross-marshalling reconnection networking, intelligent addressing, NAT and the like can be completed during the initial operation of the train network based on the ethernet, and meanwhile, the reliability problem of the ethernet in the initial operation application of the train network is more and more concerned in the industry.
In the current Ethernet Train Network system, an Ethernet Train Backbone (ETB) is mostly in a linear architecture, Ethernet Train Backbone Nodes (ETBN) are connected in series in the linear Network, each Train includes two trains, and for fault tolerance, two ETBN switches are generally deployed in each Train, and are respectively connected to an Ethernet Train Network (ECN), but in this manner: 1. the number of ETBN exchangers participating in the initial operation of a train network is large, as many as 8 ETBN exchangers participate in the initial operation when two trains are connected in a reconnection mode, and when the trains are electrified and operated initially, the number of messages is large, the initial operation failure is easily caused, and meanwhile, fault points are increased; 2. the initial operation of all ETBN exchangers is carried out in the same physical network, and if the faults that cables are broken, connectors are loosened, multiple equipment faults and the like cannot be bypassed occur, the initial operation fails, and the train cannot be normally operated.
Disclosure of Invention
Aiming at the reliability problem of the existing Ethernet in the initial operation application of the train network, the invention provides the train communication network architecture and method based on the Ethernet and the rail train, which can reduce the influence of fault points on the train operation, improve the fault tolerance of the initial operation of the Ethernet train network and improve the stability and the reliability of the train in operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ethernet-based train communication network architecture, comprising:
ethernet is organized into a network;
an ethernet train backbone comprising: the network comprises a first network plane and a second network plane which are mutually independent in physical layer, wherein the first network plane and the second network plane share one Ethernet grouping network;
the first network plane and the second network plane are respectively connected with two Ethernet train backbone network nodes in series in each train, each Ethernet train backbone network node is provided with an ETBN switch, and the ETBN switches are connected with the Ethernet marshalling network.
According to the invention, the Ethernet train backbone network is divided into two network planes which are redundant with each other, when the initial operation in one network plane fails due to the occurrence of cable breakage, connector looseness, multi-equipment failure and other non-bypassable failures in any one network plane, the other network plane can still provide a correct initial operation result, the normal operation of a train is maintained, the overall communication function of the train is not influenced, the design effectively improves the fault-tolerant capability of the Ethernet train network, and the robustness and the stability of the initial operation of the Ethernet train network are ensured; in addition, the ETBN exchanger in the train backbone network is divided into two independent first network planes and second network planes respectively, so that the number of initial operation nodes and the number of messages are effectively reduced under the condition of ensuring redundancy, the influence of system fault points on train operation is reduced, and the initial operation efficiency of the train network is further improved.
Preferably, the first network plane and the second network plane both have a logically independent initial operation channel and a data channel, wherein the initial operation channel is used for transmitting an initial operation message; the data channels are used for cross-consist communication. The data channels in each network plane are logically independent from the initial operation channel, so that the data exchange in the data channels in the train operation can be effectively ensured not to influence the initial operation result in the initial operation channel; meanwhile, the two initial operation channels are mutually independent and do not interfere with each other, independent initial operation can be carried out in respective network planes, respective initial operation results are obtained, and when a fault occurs in any network plane which is mutually redundant, the initial operation result of the other network plane can ensure the normal operation of the train.
Preferably, a central control unit CCU is disposed in the ethernet marshalling network, and is configured to arbitrate a master-slave relationship between the first network plane and the second network plane. The invention realizes the logic control of the initial operation of the train through the CCU, ensures the smooth start of the train operation and the stability and reliability of the train in the operation process.
The rail train is characterized in that the train communication network architecture based on the Ethernet is adopted.
The rail train provided by the invention has the network planes of two Ethernet train backbone networks which are redundant with each other, thereby being beneficial to reducing the influence of train fault points on the overall operation and ensuring the normal operation of the train; the invention can effectively reduce the number of the nodes and the number of the messages in the initial operation of the train network when the train is initially electrified, and divides the ETBN exchanger in the traditional train backbone network into two independent first network planes and second network planes, thereby effectively reducing the number of the nodes and the number of the messages in the initial operation under the condition of ensuring redundancy and being beneficial to improving the initial operation efficiency of the train network.
A train communication method is applied to the train communication network architecture based on the Ethernet, and comprises the following steps:
performing network initial operation in the first network plane and the second network plane respectively;
the first network plane and the second network plane respectively send respective initial operation results to a Central Control Unit (CCU) in the Ethernet marshalling network;
and the CCU carries out arbitration, and selects the first network plane or the second network plane as a main network for train operation.
The train communication method provided by the invention provides logical control of the initial operation stage of the train for the operation of the train with two Ethernet train backbone network planes, so that the train system can determine the most optimal selection in the initial operation results of the two network planes, and the stability and the reliability of the operation of the train are ensured; and the method can reduce the influence of equipment faults on the overall operation of the train, effectively improve the fault tolerance of the system and ensure the safety and reliability of the train communication architecture.
Preferably, after the first network plane is selected as the master network, the method further includes the following steps: and transmitting the initial operation message in the initial operation channel of the first network plane, and transmitting the cross grouping information in the data channel of the first network plane. The step can ensure that the communication state is continuously maintained in the first network plane after the arbitration is finished, and the initial operation result is kept.
Preferably, after selecting the second network plane as the master network, the method further includes the following steps: and transmitting the initial operation message in the initial operation channel of the second network plane, and transmitting the cross grouping information in the data channel of the second network plane. The step can ensure that the communication state is continuously maintained in the second network plane after the arbitration is finished, and the initial operation result is kept.
Preferably, during the running process of the train, the method further comprises the following steps: judging whether the initial running state of the main network changes in real time, and if so, arbitrating again; otherwise, continuing to operate the train based on the main network. The step can timely adjust the train operation through the CCU when the operation state of the main network changes, avoids the influence of equipment faults in the main network on the overall operation of the train, further improves the fault tolerance of the system, and ensures the stability and the reliability of the train operation.
A rail train is characterized in that the train communication method is adopted.
The rail train provided by the invention has the network planes of the two Ethernet train backbone networks which are redundant mutually, the most optimal selection can be determined in the initial operation results of the two network planes, and meanwhile, the main network for initial operation of the train can be controlled and replaced in time when the main network for initial operation of the train fails, so that the influence of equipment failure on the overall operation of the train is reduced, and the safe and reliable operation of the train is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art train network architecture;
fig. 2 is a schematic diagram of a train network architecture according to the present embodiment;
fig. 3 is a flowchart of a train communication method according to this embodiment.
In the above figures, 1, Ethernet is organized; 2. an Ethernet train backbone; 21. a first network plane; 22. a second network plane; an ETBN switch; 4. an Ethernet channel; 5. initially operating a channel; 6. and (6) a data channel.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic diagram of a Train Network architecture in the prior art, in a conventional Train Ethernet Network system, an Ethernet Train Backbone (ETB) 2 is a linear architecture, Ethernet Train Backbone Nodes (ETBN) are connected in series in the linear Network, each Train in the prior art includes two trains, and for fault tolerance, two ETBN switches 3 are disposed in each Train, and are respectively connected to a Train Ethernet Train Network 1 (ECN).
As shown in fig. 1, when two trains are reconnected to each other and include 4 marshalls, as many as 8 ETBN switches 3 participate in the initial operation of the train, when the train is initially powered on, as many ETBN switches 3 participate in the initial operation of the train network, there are many messages during the initial operation, and the situation of failure of the initial operation of the train is likely to occur, and the number of ETBN switches 3 participating in the initial operation is increased while the number of failure points of the initial operation of the train is increased, so that the fault tolerance of the conventional ethernet network system is poor; in the conventional ethernet network system, the initial operation of all ETBN switches 3 is performed in the same physical network, and as long as there is a fault such as a cable break or a loose connection of a connector, the initial operation fails, which hinders the normal operation of the train.
In order to solve the above problems, the present application provides an ethernet-based train communication network architecture. Fig. 2 is a schematic diagram of a train network architecture according to the present embodiment, and hereinafter, a specific embodiment of the present application will be described in detail with reference to fig. 2.
Specifically, the ethernet-based train communication network architecture provided by the present invention divides the train backbone network 2 into two mutually independent network planes, namely a first network plane 21 and a second network plane 22. In this embodiment, the two network planes are independent from each other in the physical layer and do not interfere with each other, and when the device is initially powered on, the two network planes can both perform independent initial operation operations. In the embodiment, the two network planes are redundant, and when the initial operation in the network plane fails due to the faults such as cable breakage, connector looseness, multiple equipment faults and the like in any one of the redundant network planes, the other network plane can still provide a correct initial operation result, so that the normal operation of the train is maintained, the overall communication function of the train is not influenced, and the arrangement of the two backbone network planes of the train helps to improve the fault-tolerant capability of the system and ensure the reliability of the initial operation of the train.
The Ethernet train backbone network nodes ETBN arranged at two ends of each train are arranged in each network plane, and the nodes ETBN of the Ethernet train backbone networks in the same network plane are connected in series in the respective network plane.
Further, each train in the present embodiment also includes two trains, and two ETBN switches 3 are disposed in each train. Meanwhile, each ETBN switch 3 is connected to the ethernet marshalling network 1 of the train through an ethernet channel, so that the first network plane 21 and the second network plane 22 share one ethernet marshalling network 1. In the present embodiment, two ETBN exchanges 3 in each train consist are redundant to each other, and a failure of any ETBN exchange 3 that is redundant to each other does not affect the overall communication function of the train. Meanwhile, the design can reduce the number of nodes and the number of messages in the initial operation of the train network and reduce the fault points of the system under the condition of ensuring redundancy.
As shown in fig. 2, taking two trains of train reconnection as an example, only 4 ETBN switches 3 participate in initial operation in the same network plane, and compared with the conventional linear train backbone network architecture, the initial operation messages of the novel redundant network architecture provided by the present invention in each network plane are reduced by 1/2. The design reduces the number of ETBN exchangers 3 participating in the initial operation of the train network in the same physical network, further reduces the initial operation message quantity in a network plane, reduces fault points in the network plane, reduces the complexity of the initial operation process of the train, and is beneficial to improving the robustness of the system.
Further, the first network plane 21 and the second network plane 22 each have two ethernet channels, namely the primary operation channel 5 and the data channel 6. The initial operation channel 5 is used for transmitting an initial operation message, maintaining the communication state of the train and keeping an initial operation result; the data channel 6 is used for realizing cross-grouping communication of each vehicle-mounted device in the Ethernet grouping network 1. The two channels are logically independent, so that the initial operation message in the embodiment is only transmitted in the initial operation channel 5 and is not influenced by the data channel 6, the initial operation result is not influenced by data exchange in train operation, the reliability of the train communication network architecture based on the Ethernet is favorably improved, and the stability of the train in operation is enhanced.
In the present embodiment, the train ethernet marshalling network 1 includes, inside it, onboard devices such as a central processing unit CPU, a central control unit CCU, a remote input/output module RIOM, a human-machine interface unit HMI, a train data recording unit ERM, a door control unit EDCU, a passenger information system PIS, a smoke alarm system FAS, and the like, and each device performs cross-marshalling communication via the ETBN switch 3 in the marshalling for realizing normal operation of the train.
The invention provides a rail train which is provided with the train communication network architecture based on the Ethernet.
The rail train provided by the invention has the network planes of two Ethernet train backbone networks which are redundant with each other, thereby being beneficial to reducing the influence of train fault points on the overall operation and ensuring the normal operation of the train; in addition, when the train is initially electrified, the number of nodes and the number of messages in initial operation of the train network can be effectively reduced, and the ETBN exchanger in the traditional train backbone network is divided into two independent first network planes 21 and second network planes 22, so that the number of the nodes and the number of the messages in initial operation are effectively reduced under the condition of ensuring redundancy, and the initial operation efficiency of the train network is improved.
The invention also provides a train communication method applied to the Ethernet-based train communication network architecture. Fig. 3 is a flowchart of a train communication method according to the present embodiment, and hereinafter, the train communication method during initial operation of a train according to the present embodiment will be described in detail with reference to fig. 3. Specifically, the train communication method provided by the invention comprises the following steps:
s1, performing network initial operation in the first network plane 21 and the second network plane 22 respectively;
specifically, after the device is powered on, each ETBN switch 3 in the first network plane 21 and the second network plane 22 of the present embodiment simultaneously performs initial operation in the respective initial operation channel 5, and the operation processes of the ETBN switches in different network planes are independent and do not interfere with each other.
S2, the first network plane 21, and the second network plane 22 respectively send their initial operation results to the central control unit CCU;
specifically, after the initial operation is finished, the first network plane 21 and the second network plane 22 respectively send respective initial operation results to the central control unit CCU in the train ethernet organizing network 1 through the respective ETBN switch 3, and the central control unit CCU receives the initial operation results of the first network plane 21 and the second network plane 22, and arbitrates the two initial operation results to determine the operation results and the master-slave results of the first network plane 21 and the second network plane 22.
S3, the central control unit CCU arbitrates to determine the master-slave relationship between the first network plane 21 and the second network plane 22; if the first network plane 21 is selected as the master network, go to step S4; otherwise, selecting the second network plane 22 as the master network and executing step S5;
specifically, the central control unit CCU arbitrates the initial operation result of the first network plane 21 and the initial operation result of the second network plane 22 according to preset rules of the system, selects one of the two train backbones 2 as a main network for the initial operation of the train, performs train operation based on the initial operation result of the network plane, and simultaneously uses the other network plane as a standby network.
S4, distributing data information of the first network plane 21, and carrying out train operation based on the initial operation result of the first network plane 21;
if the first network plane 21 is selected as the main operation network by the central control unit CCU, the train will operate by using the initial operation result of the first network plane 21. Specifically, the initial operation message is transmitted in the initial operation channel 5 of the first network plane 21, and the cross-grouping information is transmitted in the data channel 6 of the first network plane 21. Therefore, the train runs according to the initial running result of the first network plane 21, and the communication state is continuously maintained in the first network plane 21 after the arbitration is finished, so that the initial running result is kept.
S5, distributing data information of the second network plane 22, and carrying out train operation based on the initial operation result of the second network plane 22;
if the second network plane 22 is selected as the main operation network by the central control unit CCU, the train performs the initial operation by using the initial operation result of the second network plane 22. Specifically, the initial operation message is transmitted in the initial operation channel 5 of the second network plane 22, and the cross-grouping information is transmitted in the data channel 6 of the second network plane 22. Therefore, the train runs according to the initial running result of the second network plane 22, and the communication state is continuously maintained in the second network plane 22 after the arbitration is finished, so that the initial running result is kept.
Further, in the process of train operation based on the initial operation result of the first network plane 21 or the second network plane 22, the following steps are also executed:
s6, judging whether the initial operation state of the main network changes in real time, if so, returning to the step S2; otherwise, the execution continues to step S4/S5 until the end of the run.
Specifically, after the central control unit CCU selects the main operation network of the train, in the operation process of the train, the system may monitor in real time whether the initial operation states of the first network plane 21 and the second network plane 22 change, and if the detection result indicates that the initial operation state of the network plane does not change, continue to operate according to the selected network plane; if the initial operation state of the network plane is detected to be changed, the system can adjust in time, the central control unit CCU arbitrates the initial operation results of the first network plane 21 and the second network plane 22 after the initial operation state is changed again, a main network adopted by train operation is selected, and steps S2 to S6 are executed in a circulating manner until the train operation is finished. The step can timely adjust the train operation through the CCU when the operation state of the main network changes, avoid the influence of equipment faults in the main network on the overall operation of the train, further improve the fault-tolerant capability of the system and ensure the stability and the reliability of the train operation.
The train communication method provided by the invention provides the logical control of the initial operation of the train for the operation of the train with two Ethernet train backbone network planes, can determine the most optimal selection in the initial operation results of the two network planes, and is favorable for ensuring the stability and the reliability of the operation of the train; the method can avoid the influence of single equipment failure on the overall operation of the train, effectively improves the fault tolerance of the system and ensures the safety and reliability of the train communication architecture.
The invention also provides a rail train, and the rail train adopts the train communication method.
The rail train provided by the invention has the network planes of the two Ethernet train backbone networks which are redundant mutually, the most optimal selection can be determined in the initial operation results of the two network planes, and meanwhile, the main network for initial operation of the train can be controlled and replaced in time when the main network for initial operation of the train fails, so that the influence of equipment failure on the overall operation of the train is reduced, and the safe and reliable operation of the train is ensured.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (9)
1. An ethernet-based train communication network architecture, comprising:
ethernet is organized into a network;
an ethernet train backbone comprising: the network comprises a first network plane and a second network plane which are mutually independent in physical layer, wherein the first network plane and the second network plane share one Ethernet grouping network;
the first network plane and the second network plane are respectively connected with two Ethernet train backbone network nodes in series in each train, each Ethernet train backbone network node is provided with an ETBN switch, and the ETBN switches are connected with the Ethernet marshalling network.
2. The ethernet-based train communication network architecture according to claim 1, wherein the first network plane and the second network plane each have a logically independent initial operation channel and a data channel, wherein the initial operation channel is used for transmitting an initial operation message; the data channels are used for cross-consist communication.
3. An ethernet-based train communication network architecture according to claim 1, wherein a central control unit CCU is provided within said ethernet marshalling network for arbitrating the master-slave relationship of said first and second network planes.
4. A rail train, characterized in that an ethernet based train communication network architecture according to any of claims 1-3 is employed.
5. A train communication method applied to the ethernet-based train communication network architecture according to any one of claims 1 to 3, comprising the steps of:
performing network initial operation in the first network plane and the second network plane respectively;
the first network plane and the second network plane respectively send respective initial operation results to a Central Control Unit (CCU) in the Ethernet marshalling network;
and the CCU carries out arbitration, and selects the first network plane or the second network plane as a main network for train operation.
6. The train communication method according to claim 5, further comprising the steps of, after selecting the first network plane as the primary network:
and transmitting the initial operation message in the initial operation channel of the first network plane, and transmitting the cross grouping information in the data channel of the first network plane.
7. The train communication method according to claim 5, further comprising the steps of, after selecting the second network plane as the primary network:
and transmitting the initial operation message in the initial operation channel of the second network plane, and transmitting the cross grouping information in the data channel of the second network plane.
8. The train communication method according to claim 5, further comprising the steps of, during the operation of the train:
judging whether the initial running state of the main network changes in real time, and if so, arbitrating again; otherwise, continuing to operate the train based on the main network.
9. A rail train, characterized in that the train communication method according to any one of claims 5 to 8 is employed.
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| CN114162174A (en) * | 2021-12-03 | 2022-03-11 | 中车唐山机车车辆有限公司 | Train virtual marshalling network system |
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