Rail transit head and tail vehicle-mounted platform and connection method thereof

Abstract

The application discloses a kind of rail transit head and tail vehicle-mounted stations and its connecting method, vehicle-mounted station includes control box and host computer, control box includes interactive module and state control module, state control module is connected with the interactive module and host computer of this end respectively, to obtain the state information of host computer and dispatch station communication information and information analysis;And make interactive module establish communication with dispatch station by host computer;The state control module of head end and parking end vehicle-mounted station is mutually connected, based on the state information of head end and tail end host computer, the host computer of this end and opposite end is switched.When the host computer of one end fails or communication is affected, it can be switched to the other end based on state information, at the same time, based on the state control module of two ends, double-machine backup of state information is played, so that the real-time communication dispatch command is not affected, and resource utilization is improved, and cost is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of rail transit communication equipment, specifically relating to a rail transit vehicle front and rear onboard unit and its connection method. Background Technology

[0002] The application of urban rail transit has greatly alleviated urban traffic congestion and provided convenience for urban residents' travel. Wireless communication is an important component of the subway communication system, playing a crucial role in ensuring train operation safety. Existing urban rail transit trains have one driver's cab at the front and one at the rear, each equipped with an onboard TETRA (Terrestrial Trunked Radio) radio. These two onboard radios serve as independent wireless communication command terminals, providing the dispatching and control center with command and control over the train.

[0003] As the train's direction of travel changes and the driver's cab position shifts, the roles of the front and rear of the train also change. In actual operation, the driver uses the onboard radio at the front of the train, while the radio at the rear remains idle. If a module on the front radio malfunctions, the dispatch center will lose real-time communication and command for that train, causing significant disruption to the operation of busy urban rail transit. The usual method to allow the train driver to maintain contact with the dispatch center is to use a spare handheld walkie-talkie instead of the onboard radio. However, this solution has the following drawbacks: 1. An additional handheld walkie-talkie must be added, increasing the investment in equipment; 2. When one host is enabled, the other host still runs at full power, wasting resources.

[0004] 3. During train operation, handheld walkie-talkies can only perform basic voice communication and cannot perform other important functions in train dispatching, including automatic group transfer, automatic switching of dispatcher console affiliation, calling the station above, calling the station below, calling the station below, requesting group transfer, confirming calls, sending and receiving text commands, broadcasting to train passengers via the onboard radio, real-time display of train location status, and local storage of driver conversations. Summary of the Invention

[0005] To address the shortcomings of existing technologies and achieve master-slave switching between the front and rear vehicle-mounted radios, ensuring uninterrupted real-time communication, dispatching, and command, while simultaneously improving resource utilization, this invention adopts the following technical solution: A rail transit vehicle front and rear onboard unit includes a control box and a host. The control box includes an interactive module and a status control module that are interconnected. The status control module is connected to the host at its local end and the host at the front or rear end of the vehicle. The status control module is used to record the status information of the host and switch the local and remote hosts based on the status information. The host is used for communication between the interaction module and the dispatch console, as well as for parsing communication information.

[0006] Furthermore, the host includes a host module and a vehicle radio module connected to each other, and the status control module is connected to the host module and vehicle radio module at the local end, as well as the host module and vehicle radio module at the front or rear of the vehicle at the other end. The vehicle-mounted module is used for voice and business data communication between the interaction module and the dispatch console; The host module is used for protocol parsing of voice and service data.

[0007] The host module and the vehicle-mounted radio module transmit service data via serial port and voice data via cross-connected speaker and microphone ports. Switching between the two hosts is based on the combined status information of both the host module and the vehicle-mounted radio module. Simultaneously, based on the status information of individual modules within the host system, switching can also be performed on individual modules. For example, if the vehicle-mounted radio module at the front of the vehicle or the host module at the rear fails, scheduling information can be obtained through the rear-mounted radio module, and protocol parsing can be performed through the host module at the front of the vehicle before the parsed information is sent to the interaction module.

[0008] Furthermore, the transmission of the service data will establish heartbeat packets to detect the link status. When the link failure exceeds the threshold, it will be reported to the status control module. When there is service data transmission between heartbeats, the heartbeat packets will be turned off until the system is idle, at which point the detection will be turned on again.

[0009] Furthermore, the host module performs registration status detection based on the registration message received by the vehicle-mounted radio module, checking whether the vehicle-mounted radio module has registered with the base station, and reports the unregistered status to the status control module to switch the corresponding module and obtain the registration message. Since the dispatching console needs to obtain the train's location information, which is determined based on whether the vehicle-mounted radio module has registered with the base station, module failure or signal problems may prevent the vehicle-mounted radio module from registering with the base station. In this case, switching the vehicle-mounted radio module and / or the host module completes the registration. This avoids registration failures caused by module failures and also avoids registration failures caused by poor signals at the front or rear of the train, thus ensuring the dispatching station can obtain the train's location.

[0010] Furthermore, the status modules are connected to each other and the control box is connected to the host via a network, and the host module is connected to the audio channel via a link. The switching is performed by the status control module based on the following conditions: Hardware priority; prioritize hosts with normal current network status and serial port link status, and consider any abnormal status of one of them as a hardware failure. Optimal priority; when the network status and serial port status are normal, the host with the best registration status (the better the signal, the higher the priority) is selected first, and the remaining modules enter the power saving mode. Same-side priority: When the network status, serial port link status, and registration status of both hosts are the same, the same-side module is selected, and the remaining module enters energy-saving mode and is woken up again when needed, thus reducing energy consumption while ensuring communication capability and communication quality.

[0011] Furthermore, the registration of the vehicle radio module with the base station includes information about whether the module is located at the front or rear of the train. Based on the registration time of the front or rear of the train at the station and the length of the train body, the entry and exit times are calculated to more accurately determine the train's location information. Because there is a length of the train body between the front and rear of the train, when the train position is based on the front of the train, the vehicle radio module at the front of the train loses its registration with the base station when the front of the train leaves the station. When the vehicle radio module at the front of the train switches to the vehicle radio module at the rear of the train, the train's exit is based on the exit of the rear of the train. However, the dispatch center still uses the exit of the front of the train as the reference, leading to a discrepancy between the train's exit time displayed by the dispatch center and the actual exit time. The train may have actually left the station, but the display device in the dispatch center still shows the train as still at the station. By providing information about whether the vehicle radio module is located at the front or rear of the train during registration, the dispatch center can calculate the actual exit or entry time of the train based on the length of the train, thus making the train location information reflected in the dispatch center more accurate.

[0012] Furthermore, the interaction module is connected to the interaction module at the front or rear of the vehicle via a switch, and the status control module obtains the status information of the host at the other end through its own interaction module. Therefore, as long as the interaction module at the front end and the connections between the interaction modules are fault-free, other modules can be replaced by modules from the other end, and the status information can be displayed in real time on the interaction module at the front end.

[0013] Furthermore, the status control module sends heartbeat packets to both hosts. When the heartbeat packet loss exceeds the threshold, the channel is restarted. If the channel cannot be restored after restarting, a host switch is performed and reported.

[0014] Furthermore, when the status control module performs host switching based on status information, it compares the average status information at the front and rear of the vehicle at regular intervals to avoid frequent host switching. The status information also reflects fluctuations in status over time. By setting a status information fluctuation threshold, hosts exceeding this threshold are woken up by the status control module of the waiting end and switched to the other end, thus preventing instability in the performance or communication of one host. Since the local end can obtain the status information of its own host earlier than the other end, in the event of a local host failure, the local status control module initiates the switch and synchronizes it to the other end. When the status control module needs to obtain status information from both ends for optimal switching, the status control module of the backup end initiates the switch to ensure that the standby host of the backup end is woken up and to reduce the frequency of switching-based interactions between status control modules.

[0015] A method for connecting a front and rear onboard unit of a rail transit vehicle, wherein the onboard unit includes an interaction module, a status control module, and a host, the method being as follows: The status control module connects to the local interaction module and the host respectively to obtain the communication information between the host and the dispatch console and the status information of information parsing; and enables the interaction module to establish communication with the dispatch console through the host. The status control modules of the vehicle-mounted units at the front and rear ends are interconnected, and the units switch between the local and remote units based on the status information of the main units at the front and rear ends.

[0016] The advantages and beneficial effects of this invention are as follows: The present invention discloses a front and rear vehicle-mounted radio and its connection method for rail transit vehicles. The front and rear vehicles are controlled by a status control module at one end. When the host at one end fails or communication is affected, it can automatically switch to the other end based on status information. At the same time, the status control modules at both ends serve as a dual-machine backup of status information. When the status control module at one end fails, the status detection and host switching can continue through the status control module at the other end. Seamless host switching can be achieved, so that real-time dispatch and command are not affected. Attached Figure Description

[0017] Figure 1 This is a network diagram of vehicle-mounted radios in existing technology.

[0018] Figure 2 This is a schematic diagram of the connection method between the vehicle front and rear platform in an embodiment of the present invention.

[0019] Figure 3 This is a control logic diagram of the train control vehicle-mounted station in an embodiment of the present invention.

[0020] Figure 4This is a schematic diagram of a single group of devices transmitting data in an embodiment of the present invention.

[0021] Figure 5 This is a flowchart of the state determination process in an embodiment of the present invention.

[0022] Figure 6 This is a unidirectional scheduling data flow diagram in an embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] like Figure 1 As shown, urban rail transit trains are equipped with one onboard TETRA radio at the front and one at the rear. These two onboard radios serve as independent wireless communication command terminals, providing the dispatching and command center with command and dispatch of the train. In actual operation, the onboard radio at the rear of the train is idle, resulting in a waste of resources. When a module of the onboard radio at the front of the train fails, the dispatching console of the command center will lose real-time communication and dispatching command of the train, requiring additional equipment to be used.

[0025] like Figure 2 As shown, a type of onboard radio for rail transit vehicles is provided at both the front and rear ends. Each end of the vehicle has a control box and a main unit. The control box consists of a UI (User Interface) module and a status control module. The main unit consists of a radio module and a main unit module. The UI module is responsible for the interface display and driver interaction. The status control module is responsible for recording the status of each module and selecting modules. The main unit module is responsible for protocol parsing. The radio module is responsible for voice reception and transmission, as well as communication with the dispatching station base station. The status control module and the main unit module at the same end are directly connected via a network cable. The front and rear end devices are connected to a switch via a network cable. Specifically, the two UI modules at the front and rear ends are connected via a switch. The UI modules also have reserved broadcast and dry contact interfaces. The front end establishes UDP (User Datagram Protocol) connections with its own main unit module and the rear end's main unit module through the status control module. The rear end establishes UDP connections with its own main unit module and the front end's main unit module through the status control module. Figure 3As shown, the connection between the host module and the vehicle radio module is functionally divided into a data channel and an audio channel, connected via a serial port and an audio circuit, respectively. The speaker of the vehicle radio module connects to the microphone of the host module, and vice versa, to transmit audio. The serial port handles the transmission of protocol-related data such as SMS messages. Through the serial port connection between the host module and the vehicle radio module for business data transmission, and the cross-connection of the speaker and microphone for voice data transmission, a status control module controls the dual hosts. This allows for seamless switching between primary and secondary connections if any module at the front or rear of the vehicle fails. This connection method ensures that when a module at the front of the vehicle malfunctions, the corresponding module at the rear can seamlessly switch over to the front assembly, maintaining uninterrupted real-time communication and dispatching. Simultaneously, the remaining modules enter energy-saving mode and can be reactivated when needed.

[0026] When the status control module performs host switching based on status information, it compares the average status information at the front and rear of the vehicle at regular intervals to avoid frequent host switching. The module also observes fluctuations in status information over time. By setting a status information fluctuation threshold, hosts exceeding this threshold are switched to the peer host via the status control module of the waiting end, thus preventing instability in the performance or communication of one host. Since the local end can obtain the status information of its own host earlier than the peer end, in the event of a local host failure, the local status control module initiates the switch and synchronizes it to the peer end. When the status control module needs to obtain status information from both ends for optimal switching, the status control module of the backup end initiates the switch to ensure that the standby host on the backup end is awakened and to reduce the frequency of switching-based interactions between status control modules.

[0027] Each UDP connection requires the state control module to continuously send heartbeat packets to defog and monitor whether the connection is successful. If one end detects that the number of lost heartbeat packets exceeds a specified threshold, it restarts the channel. Both ends of the channel start timers to periodically send heartbeat messages. If the channel cannot be restored after restarting, it indicates that the other end may be unresponsive. At this time, the state control module disconnects the channel and reports to the upper-layer application, while simultaneously selecting the other end as the primary channel.

[0028] The host consists of a vehicle module and a host module, which communicate via serial port. The host module uses AT commands, which is short for Attention, to transmit data between the DTE (Data Terminal Equipment) and the DCE (Data Circuit Terminal). The DTE and DCE are connected via serial port.

[0029] During power-on initialization, the serial port is checked for availability. If available, a heartbeat is established every 5 seconds to monitor link status. If two link failures occur, an error is reported to the status control module. If messages are sent between serial ports within 5 seconds, the heartbeat is disabled and re-established during idle periods. The host module (AT) also handles registration status checks, verifying whether the vehicle-mounted radio module has registered with the base station. Specifically, it checks for registration messages received from the vehicle-mounted radio module. If the registration status changes to unregistered, an error is reported to the status control module.

[0030] The registration of the radio module with the base station includes information about whether the module is located at the front or rear of the train. Based on the registration time of the front or rear of the train at the station and the length of the train body, the arrival and departure times are calculated to more accurately determine the train's location. Because of the length of the train body between the front and rear, when the train's location is based on the front, if the front leaves the station, the radio module at the front loses its registration with the base station. When the front radio module is switched to the rear radio module, the train's departure is based on the rear's departure. However, the dispatch center still uses the front departure as the reference, leading to a discrepancy between the train's displayed departure time and the actual departure time. The train may have actually left the station, but the dispatch center's display still shows the train as still at the station. By providing information about whether the radio module is located at the front or rear of the train during registration, the dispatch center can calculate the actual arrival or departure time based on the train's length, thus making the train's location information reflected in the dispatch center more accurate.

[0031] The status control module selects the optimal host module using two methods: manual switching and automatic switching. The selected module is in normal mode, while other modules switch to energy-saving mode to reduce power consumption. Manual switching involves the driver manually operating the control console to switch to the appropriate module based on their specific needs. Automatic switching, on the other hand, is determined by the status control module's algorithm, the specific calculation method of which is as follows: 1. Hardware priority: Prioritize hosts with normal current network status and serial port link status; any host with abnormal status is considered a hardware failure.

[0032] 2. Optimal Priority: When the network status and serial port status are both normal, the module with the best registration status (the better the signal, the higher the priority) is selected first, and the remaining modules enter the power saving mode.

[0033] 3. Same-side priority: When the network status, serial port link status, and registration status of both hosts are the same, the same-side module is selected, and the remaining module enters the energy-saving mode.

[0034] like Figure 4As shown, the status control module automatically selects the optimal host module and vehicle radio module to establish a connection based on the manual or channel UDP connection status, serial port connection status, registration status, etc. After the channel is established, user-operated data such as SMS messages through the UI module is sent to the corresponding host module via UDP. The host module then sends the data to the vehicle radio module via serial port, and finally the vehicle radio module sends it to the air interface. When the vehicle radio module receives the SMS message or other data, it sends it to the host via serial port, and then the host sends it to the status control module, which finally displays it to the user through the UI module.

[0035] like Figure 5 As shown, the status control module is responsible for status judgment and module selection. The main units at the front and rear of the vehicle are responsible for sending their local network status, link status, and registration status to the status control module for logical judgment. Voice data received by the user through the UI module's microphone is first sent to the status control module, which determines the optimal path and then sends it to the corresponding vehicle radio module via UDP. The vehicle radio module then processes the received voice data... Figure 4 The vehicle radio module shown will receive voice data sent from the host speaker to the mic of the vehicle radio module. After receiving the voice data, the vehicle radio module will send the voice data to the base station dispatch console through the air interface.

[0036] like Figure 6 As shown, when the train radio module receives voice data sent by the dispatcher through the air interface, it transmits it to the microphone of the host module via the speaker of the train radio module. After parsing the voice data, the host module sends it to the status control module via UDP. Finally, the status control module sends it to the UI module for playback to the train driver.

[0037] When a train departs from the current station to the next station, its location information needs to be updated. When the dispatch console detects a location change for a train (registration switch: the radio module changes from a base station at one station to a base station at another station), it sends a train dispatch SMS to the radio module. After receiving the SMS, the radio module... Figure 4 As shown, the data is sent to the host module via serial port, and the host module sends it to the status control module via UDP, which then sends it to the UI module for location information updates.

[0038] A method for connecting a front and rear onboard unit of a rail transit vehicle, wherein the onboard unit includes an interaction module, a status control module, and a host, the method being as follows: The status control module connects to the local interaction module and the host respectively to obtain the communication information between the host and the dispatch console and the status information of information parsing; and enables the interaction module to establish communication with the dispatch console through the host. The status control modules of the vehicle-mounted units at the front and rear ends are interconnected, and the units switch between the local and remote units based on the status information of the main units at the front and rear ends.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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 vehicle-mounted platform for the front and rear ends of a rail transit car, comprising a control box and a main unit, characterized in that: The control box includes an interactive module and a status control module that are interconnected. The status control module is connected to the host at this end and the host at the front or rear of the vehicle at the other end. The host includes a host module and a vehicle radio module that are interconnected. The status control module is connected to the host module and the vehicle radio module at this end, as well as the host module and the vehicle radio module at the front or rear of the vehicle at the other end. The status control module is used to record the status information of the host and switch the local and remote hosts based on the status information. The host is used for communication between the interaction module and the dispatch console, and for parsing communication information; wherein: The host module performs registration status detection based on the registration message received by the vehicle-mounted unit module, detects whether the vehicle-mounted unit module has registered with the base station, and reports the unregistered status to the status control module so as to switch the corresponding module and obtain the registration message. The registration of the vehicle radio module at the base station includes information on the front or rear of the train where the vehicle radio module is located. Based on the registration time of the front or rear of the train at the station and the length of the train body, the entry and exit times are calculated to determine the train's location information. The interaction module is connected to the interaction module at the front or rear of the vehicle via a switch, and the status control module obtains the status information of the host through the interaction module at its own end. When the status control module switches hosts based on status information, it compares the average status information at the front end of the vehicle with the average status information at the rear end of the vehicle at regular intervals. It obtains the fluctuations in status information from the status information during that period. By setting a status information fluctuation threshold, for hosts that exceed the fluctuation threshold, the status control module of the switchable end is woken up and switched to the other end host. The vehicle-mounted module is used for voice and business data communication between the interaction module and the dispatch console; the host module is used for protocol parsing of voice and business data; the transmission of business data will establish a heartbeat packet to detect the link status. When the link failure exceeds the threshold, it will be reported to the status control module. When there is business data transmission between heartbeats, the heartbeat packet will be turned off until the detection is turned on again when there is no data. The status control modules are connected to each other and the control box is connected to the host via a network. The host module is connected to the audio channel via a link. The switching is performed by the status control module based on the following conditions: Hardware priority; prioritize hosts with normal current network and link status, and consider any host with abnormal status as a hardware failure. Optimal priority; when the network status and serial port status are both normal, the host with the best registration status is selected first, and the remaining modules enter the power saving mode. Same-side priority: When the network status, serial port link status, and registration status of both hosts are the same, the same-side module is selected, and the remaining module enters energy-saving mode. The status control module sends heartbeat packets to both hosts. When the heartbeat packet loss exceeds the threshold, the channel is restarted. If the channel cannot be restored after restarting, a host switch is performed and reported.

2. A method for connecting the front and rear vehicle platforms of a rail transit car, characterized in that: The method using the on-board unit for the front and rear of a rail transit vehicle as described in claim 1, wherein the on-board unit includes an interaction module, a status control module, and a host, is as follows: The status control module connects to the local interaction module and the host respectively to obtain the communication information between the host and the dispatch console and the status information of information parsing; and enables the interaction module to establish communication with the dispatch console through the host. The status control modules of the front and rear vehicle-mounted units are interconnected, and the local and remote unit switches based on the status information of the front and rear unit.

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