CN115782962A - Ethernet-based train-level data control method - Google Patents

Abstract

The invention relates to the field of train data control of a motor train unit, in particular to an Ethernet-based train-level data control method, which comprises the steps of setting a whole train as a network unit by optimizing a network topology structure, communicating adjacent carriages through a vehicle-level Ethernet line, judging whether the train is in single-marshalling operation or reconnection operation by a CCU (train control unit), if the train is in single-marshalling operation, not forwarding all control data of the CCU through an ETBN (Ethernet packet network switch), and transmitting all data of subsystems in each carriage through an ECNN (electronic toll management network); if the vehicle is in reconnection operation, the train level data of the CCU is forwarded to the reconnection train group via the train level ethernet switch ETBN. The method has obvious significance for single marshalling application, can effectively avoid the influence on the operation of single marshalling vehicles caused by the fault of the train-level Ethernet switch, and improves the operation quality of the vehicles; meanwhile, the configuration quantity of CCUs and ETBN can be reduced, and therefore vehicle cost is reduced.

Description

Ethernet-based train-level data control method

Technical Field

The invention relates to the field of train data control of motor train units, in particular to a train-level data control method based on Ethernet.

Background

The vehicle-level bus of the traditional train network control system of the motor train unit mostly adopts a Multifunctional Vehicle Bus (MVB) communication technology, because the maximum transmission distance supported by the MVB (electrical intermediate distance ESD) is 200 meters, the length of an 8-group vehicle is generally about 200 meters, and if the 8-group vehicle only adopts the MVB communication, the actual cable laying can exceed the limit of 200 meters; therefore, 8 marshalling vehicles mostly adopt a 2-layer bus architecture of MVB + WTB, 1-4 vehicles are provided with one MVB network segment, 5-8 vehicles are provided with one MVB network segment, and communication between the two network segments is a control strategy of transmission through a train-level twisted Wire Train Bus (WTB).

The existing train network control system of the motor train unit adopts an Ethernet communication technology. Based on a data control strategy of a traditional motor train unit vehicle, an existing train still adopts a two-layer network architecture design scheme similar to a traditional MVB + WTB, 8 grouped motor train units are in a full train or a network topology with two network segments, 1-4 vehicles serve as 1 network unit, 5-8 vehicles serve as 1 network unit, vehicle-level Ethernet lines between 4-5 vehicles are not communicated and are not provided with ECN channels, each network unit is provided with 2 mutually redundant CCUs for summarizing the equipment state of the unit and sending a control command, for collecting the equipment state of an adjacent unit and sending the control command, the CCU of the unit is required to transmit corresponding data to another unit through a train-level Ethernet switch ETBN, once the ETBN inside 1 network unit fails, information of all systems in the unit cannot be transmitted to a partner unit, and meanwhile, the unit cannot acquire any data of the partner unit (see figure 1). In addition, the operation of the motor train unit is generally divided into single-marshalling operation and reconnection operation, under the reconnection working condition, 4 network units exist on the network, the train-level ethernet switch ETBN undertakes the data transmission function among the network units, once hardware fails and the hardware cannot be smoothly switched to the train-level switch of the hot standby unit, the loss of the train-level data transmission function can cause the vehicle to run at a reduced speed or even stop running, so that the train-level ethernet switch is used as a key component of a network control system, and the safe and reliable operation of the train-level ethernet switch can influence the application order of the train (single-marshalling and reconnection).

Disclosure of Invention

In view of the above technical problems, an object of the present invention is to provide an ethernet-based train-level data control method, where a network topology is optimized, a whole train is set as one network unit, adjacent cars are connected to each other through a vehicle-level ethernet line, a CCU determines whether the train is in single-formation operation or double-connection operation, if the train is in single-formation operation, all control data of the CCU is not forwarded through a train-level ethernet switch ETBN, and all data of subsystems in each car are transmitted through an ECNN; if the vehicle is in reconnection operation, the train level data of the CCU is forwarded to the reconnection train group via the train level ethernet switch ETBN. The method has obvious significance for single marshalling application, can effectively avoid the influence on the operation of single marshalling vehicles caused by the fault of the train-level Ethernet switch, and improves the operation quality of the vehicles; meanwhile, 2 network segments are set to be 1 network segment based on the principle of redundant configuration of ETBN and CCU in the network segments, so that the configuration number of CCU and ETBN can be reduced, and the vehicle cost is reduced.

In order to realize the purpose, the invention adopts the following technical scheme:

an Ethernet-based train-level data control method comprises the following steps:

s1, constructing a network topology structure: the method comprises the following steps that 1 train-level Ethernet switch ETBN and a central control unit CCU which are redundant with each other are respectively installed in a head carriage and a tail carriage of a motor train unit train, two vehicle-level Ethernet switches ECNN1 and ECNN2 are respectively installed in all carriages, a redundant vehicle-level data transmission channel is built, an Ethernet repeater REP is respectively configured on an intermediate carriage, amplification and shaping of train-level data signals are achieved, the train-level Ethernet switch ETBN in the head carriage is connected with the train-level Ethernet switch ETBN in the tail carriage through the Ethernet repeater installed in the intermediate carriage, and the train-level data transmission channel is built; the train-level Ethernet switch ETBN in the head carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the head carriage, the train-level Ethernet switch ETBN in the tail carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail carriage, and the adjacent carriages are connected with the vehicle-level Ethernet switch ECNN1 between the carriages to form a vehicle-level Ethernet ECN1 channel; the adjacent carriages are connected with a vehicle-level Ethernet switch ECNN2 between the carriages to form a vehicle-level Ethernet ECN2 channel; the central control unit CCU in the head car is connected to the vehicle-level ethernet switches ECNN1, ECNN2 in the head car through ethernet; a central control unit CCU in the tail compartment is connected to vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail compartment through Ethernet; each subsystem in each carriage is respectively connected with vehicle-level Ethernet switches ECNN1 and ECNN2 in the carriage through Ethernet buses, and the data of the subsystems are sent to a central control unit CCU and simultaneously received control instructions sent by the central control unit CCU through vehicle-level Ethernet ECN1 channels and ECN2 channels;

s2, judging whether the motor train unit train is in a reconnection state or not by the CCU according to the power-on and power-off states of the vehicle coupling relay, and executing the step S3 if the motor train unit train is in single-marshalling operation; if the motor train unit train is in reconnection operation, executing the step S4;

s3, transmitting the application data in the train through an ECN channel, transmitting the data fed back by each subsystem in each carriage through a vehicle-level Ethernet ECN1 channel and an ECN2 channel, sending the data to a Central Control Unit (CCU), and summarizing the information of the train by the CCU; meanwhile, a vehicle control command sent by the CCU is also transmitted to each subsystem in each carriage through the ECN1 channel and the ECN2 channel of the vehicle-level Ethernet;

s4, transmitting data among the reconnection vehicle groups through an ETB channel; each subsystem data in each compartment of the vehicle is transmitted through a vehicle-level Ethernet ECN1 channel and an ECN2 channel and sent to a central control unit CCU of the vehicle; the data of each subsystem in each compartment of the coupled vehicle is transmitted through a vehicle-level Ethernet ECN1 channel and an ECN2 channel of the coupled vehicle and sent to a central control unit CCU of the coupled vehicle, the CCUs of the two trains respectively complete data summarization in the vehicle, and train-level data among the trains are mutually sent through a train-level Ethernet switch ETBN.

Preferably, the subsystems in each car include: the system comprises a human-computer interface HMI, a wireless transmission device WTD, an input and output unit IOM, a passenger information system PIS, an air conditioner HVAC, a traction control unit TCU, a fire alarm system FAS, a charger control unit BC, an energy management system EEMS, a hot-axle monitoring system HADS, a door control unit DCU, a brake control unit BCU, a driver operation information analysis system EOAS, an earthquake early warning system EEWS and a health management host PHM.

Preferably, the vehicle-level data transmission channels ECN1 and ECN2 are provided with redundancy, the central control unit CCU preferentially adopts data of the vehicle-level ethernet ECN1 channel, and if the data of each subsystem of the channel exceeds a certain threshold value and is not updated, data of the ECN2 channel is adopted.

The invention has the advantages and beneficial effects that:

(1) The network topology structure constructed in the control method provided by the invention is a network unit, and 2 network segments are set as 1 network segment based on the principle of redundant configuration of ETBN and CCU in the network segments, so that the configuration quantity of the CCU and the ETBN of the train-level Ethernet switch can be reduced, and the vehicle cost is reduced.

(2) The network topology structure constructed in the control method provided by the invention is provided with 1 train-level Ethernet switch ETBN which is redundant with each other in the head carriage and the tail carriage, because the redundant ETBN is arranged, the failure of a single ETBN cannot influence the application of the train, the information of the train group can still realize intercommunication through an ETB channel, and the robustness of a train network system is improved.

(3) When the train is operated in a single marshalling mode, the data transmission of each subsystem is completely independent of the operation and equipment state of the train-level Ethernet switch, the train-level Ethernet switch is completely isolated from train control signals, if the train-level Ethernet switch (ETBN) fails, the operation of the train is not influenced, the influence of the failure of the train-level Ethernet switch on the operation of the train is effectively prevented, the operation quality of the train is improved, and the method is suitable for the train which is operated in a single marshalling mode for a long time.

(4) The normal operation of the single train by the control method provided by the invention is completely independent of ETBN, thereby reducing fault points.

(5) The control method provided by the invention has the advantages that the train-level Ethernet switch ETBN only works when the train is in reconnection operation, and the control mode can reduce the failure rate of the train-level Ethernet switch ETBN.

Drawings

FIG. 1 is a prior art vehicle network topology;

FIG. 2 is a vehicle network topology of the present invention a;

FIG. 3 is a vehicle network topology b of the present invention;

FIG. 4 is a schematic diagram of a train single consist failure analysis of the present invention;

fig. 5 is a schematic diagram of the train reconnection operation failure analysis of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

A train-level data control method based on Ethernet comprises the following steps:

s1, constructing a network topology structure: the method comprises the following steps that 1 train-level Ethernet switch ETBN and a central control unit CCU which are redundant mutually are respectively installed in a head carriage and a tail carriage of a motor train unit train, two vehicle-level Ethernet switches ECNN1 and ECNN2 are respectively installed in all carriages, a redundant vehicle-level data transmission channel is built, an Ethernet repeater REP is respectively configured on an intermediate carriage to amplify and shape a train-level data signal, and the train-level Ethernet switch ETBN in the head carriage is connected with the train-level Ethernet switch ETBN in the tail carriage through the Ethernet repeater REP installed in the intermediate carriage to build the train-level data transmission channel; the train-level Ethernet switch ETBN in the head carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the head carriage, the train-level Ethernet switch ETBN in the tail carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail carriage, and the adjacent carriages are connected with the vehicle-level Ethernet switch ECNN1 between the carriages to form a vehicle-level Ethernet ECN1 channel; the adjacent carriages are connected with a vehicle-level Ethernet switch ECNN2 between the carriages to form a vehicle-level Ethernet ECN2 channel; the central control unit CCU in the head carriage is connected to vehicle-level Ethernet switches ECNN1 and ECNN2 in the head carriage through Ethernet; a central control unit CCU in the tail compartment is connected to vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail compartment through Ethernet; each subsystem in each carriage is respectively connected with vehicle-level Ethernet switches ECNN1 and ECNN2 in the carriage through an Ethernet bus, and the data of the subsystem is sent to a central control unit CCU through a vehicle-level Ethernet ECN1 channel and an ECN2 channel and simultaneously receives a control instruction sent by the central control unit CCU;

s2, judging whether the motor train unit train is in a reconnection state or not by the CCU according to the power-on and power-off states of the vehicle coupling relay, and executing the step S3 if the motor train unit train is in single-marshalling operation; if the motor train unit train is in reconnection operation, executing the step S4;

s3, transmitting the application data in the train through an ECN channel, transmitting all data fed back by each subsystem in each carriage through a vehicle-level Ethernet ECN1 channel and an ECN2 channel, sending the data to a Central Control Unit (CCU), and summarizing train information such as a master key signal, a direction signal, a TCMS (train control system) main direction, subsystem information of the unit, input and output module information and the like by the CCU; meanwhile, a vehicle control command sent by the CCU is also transmitted to each subsystem in each carriage through the ECN1 channel and the ECN2 channel of the vehicle-level Ethernet;

each subsystem in each compartment comprises: the system comprises a human-machine interface HMI, a wireless transmission device WTD, an input and output unit IOM, a passenger information system PIS, an air conditioner HVAC, a traction control unit TCU, a fire alarm system FAS, a charger control unit BC, an energy management system EEMS, a hot-axle monitoring system HADS, a door control unit DCU, a brake control unit BCU, a driver operation information analysis system EOAS, an earthquake early warning system EEWS and a health management host PHM, wherein each main system is provided with two interfaces which are connected to a train network to realize dual-homing configuration;

s4, transmitting data among the reconnection vehicle groups through an ETB channel, transmitting data of each subsystem in each compartment of the vehicle through a vehicle-level Ethernet ECN1 channel and an ECN2 channel, and sending the data to a Central Control Unit (CCU) of the vehicle; the data of each subsystem in each compartment of the trailer is transmitted through vehicle-level Ethernet ECN1 channels and ECN2 channels of the trailer and sent to a Central Control Unit (CCU) of the trailer, the CCUs of the two trains respectively complete data summarization inside the vehicle, and the train-level data among the trains are mutually sent through a train-level Ethernet switch (ETBN).

Further, vehicle-level data transmission channels ECN1 and ECN2 are arranged in a redundant mode, the central control unit CCU preferentially adopts data of a vehicle-level Ethernet ECN1 channel, and if the data of each subsystem of the channel exceeds a certain threshold value and is not updated, the data of the ECN2 channel is adopted, so that the integrity of the data on a link is effectively guaranteed.

The network topology structure is suitable for 4 marshalling motor train units, the network topology structure constructed by taking the 4 marshalling motor train units as an example is shown in fig. 2, as can be seen from fig. 2, a vehicle-level network is set to be 1 network unit, 1-2-3-4 workshops are all provided with ECN channels, full train communication of head and tail data can be realized, and the train-level network part realizes data interaction of two trains only under the reconnection working condition.

As shown in fig. 3, the network topology of the present invention can also be popularized to 8-marshalled vehicle applications, and the network topology (fig. 3) constructed for 8-marshalled vehicles is different from the existing 8-marshalled vehicle network topology (fig. 1) in that 4-5 workshops have ECN channels, and 8-marshalling is a network unit at the ECN level, which has the same advantages as 4 marshalling and further reduces the configuration number of the two head cars ETBN and CCU on the basis of improving availability.

According to the control method, a network segment is arranged in the single marshalling, data transmission in the train does not pass through an ETBN level, normal operation of the single train is completely independent of the ETBN, normal operation of the train is not influenced even if the whole ETB link fails in a single marshalling operation state (see figure 4), and fault points are reduced.

In addition, 1 train-level Ethernet switch ETBN which is redundant with each other is respectively installed in a head carriage and a tail carriage of a motor train unit train, the failure of the 1 train ETBN does not influence the use of the train in the state of the reconnection use of the motor train unit, and the information of the 4 trains can still realize intercommunication through an ETB channel (see figure 5) due to the arrangement of the redundant ETBN, so that the fault working conditions of other single ETBN also have the robustness obviously.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and not for limiting the same; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (3)

1. A train-level data control method based on Ethernet is characterized by comprising the following steps:

s1, constructing a network topology structure: the method comprises the following steps that 1 train-level Ethernet switch ETBN and a central control unit CCU which are redundant with each other are respectively installed in a head carriage and a tail carriage of a motor train unit train, two vehicle-level Ethernet switches ECNN1 and ECNN2 are respectively installed in all carriages, a redundant vehicle-level data transmission channel is built, an Ethernet repeater REP is respectively configured on an intermediate carriage, amplification and shaping of train-level data signals are achieved, the train-level Ethernet switch ETBN in the head carriage is connected with the train-level Ethernet switch ETBN in the tail carriage through the Ethernet repeater installed in the intermediate carriage, and the train-level data transmission channel is built; the train-level Ethernet switch ETBN in the head carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the head carriage, the train-level Ethernet switch ETBN in the tail carriage is connected with the two vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail carriage, and the adjacent carriages are connected with the vehicle-level Ethernet switch ECNN1 between the carriages to form a vehicle-level Ethernet ECN1 channel; the adjacent carriages are connected with a vehicle-level Ethernet switch ECNN2 between the carriages to form a vehicle-level Ethernet ECN2 channel; the central control unit CCU in the head carriage is connected to vehicle-level Ethernet switches ECNN1 and ECNN2 in the head carriage through Ethernet; a central control unit CCU in the tail compartment is connected to vehicle-level Ethernet switches ECNN1 and ECNN2 in the tail compartment through Ethernet; each subsystem in each carriage is respectively connected with vehicle-level Ethernet switches ECNN1 and ECNN2 in the carriage through an Ethernet bus, and the data of the subsystem is sent to a central control unit CCU through a vehicle-level Ethernet ECN1 channel and an ECN2 channel and simultaneously receives a control instruction sent by the central control unit CCU;

s2, judging whether the motor train unit train is in a reconnection state or not by the CCU according to the power-on and power-off states of the vehicle coupling relay, and executing the step S3 if the motor train unit train is in single-marshalling operation; if the motor train unit train is in reconnection operation, executing the step S4;

s3, transmitting the application data in the train through an ECN channel, transmitting the data fed back by each subsystem in each carriage through a vehicle-level Ethernet ECN1 channel and an ECN2 channel, sending the data to a Central Control Unit (CCU), and summarizing the information of the train by the CCU; meanwhile, a vehicle control command sent by the CCU is also transmitted to each subsystem in each carriage through the ECN1 channel and the ECN2 channel of the vehicle-level Ethernet;

s4, transmitting data among the reconnection vehicle groups through an ETB channel; each subsystem data in each compartment of the vehicle is transmitted through a vehicle-level Ethernet ECN1 channel and an ECN2 channel and sent to a central control unit CCU of the vehicle; the data of each subsystem in each compartment of the coupled vehicle is transmitted through a vehicle-level Ethernet ECN1 channel and an ECN2 channel of the coupled vehicle and sent to a central control unit CCU of the coupled vehicle, the CCUs of the two trains respectively complete data summarization in the vehicle, and train-level data among the trains are mutually sent through a train-level Ethernet switch ETBN.

2. The ethernet-based train-level data control method of claim 1, wherein each subsystem in each car comprises: the system comprises a human-computer interface HMI, a wireless transmission device WTD, an input and output unit IOM, a passenger information system PIS, an air conditioner HVAC, a traction control unit TCU, a fire alarm system FAS, a charger control unit BC, an energy management system EEMS, a hot-axle monitoring system HADS, a door control unit DCU, a brake control unit BCU, a driver operation information analysis system EOAS, an earthquake early warning system EEWS and a health management host PHM.

3. The Ethernet-based train-level data control method according to claim 1, wherein the vehicle-level data transmission channels ECN1 and ECN2 are provided redundantly, the data of the vehicle-level Ethernet ECN1 channel is preferentially adopted by the central control unit CCU, and if the data of each subsystem of the channel exceeds a certain threshold value and is not updated, the data of the ECN2 channel is adopted.

Images