CN111361610A - Full-automatic train operation signal system based on time synchronization - Google Patents
Full-automatic train operation signal system based on time synchronization Download PDFInfo
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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
- B61L27/04—Automatic systems, e.g. controlled by train; Change-over to manual control
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Abstract
The invention relates to a train full-automatic operation signal system based on time synchronization, which comprises ATC equipment, ATS equipment, CI equipment, an ATS maintenance platform, MSS equipment, DCS equipment, a communication front-end processor FEP, an application server CATS and a gateway server, wherein the signal system also comprises an external clock system, the external clock system is connected with the application server CATS through the communication front-end processor FEP, the application server CATS is respectively connected with the ATS equipment, the CI equipment, the ATS maintenance platform and the gateway server, the gateway server is respectively connected with the ATC equipment and the DCS equipment, and the ATS maintenance platform is connected with the MSS equipment; the communication front-end processor synchronizes an external clock system, the inside of the signal system is synchronized by the time acquired by the communication front-end processor, and the time synchronization inside the signal system adopts an NTP protocol. Compared with the prior art, the method has the advantages of improving the system reliability and the like.
Description
Technical Field
The invention relates to a full-automatic train operation signal system, in particular to a full-automatic train operation signal system based on time synchronization.
Background
The time synchronization has important significance for improving the safety and reliability of the urban rail transit system and improving the operation efficiency, and particularly, the full-automatic operation line is asynchronous, so that the operation accuracy rate, the door opening and closing time of a vehicle door and other faults are easily influenced, and the satisfaction degree of passengers is influenced.
In a full-automatic operation line, a rail-side ATS adjusts station stop time and interval operation time aiming at early and late conditions by comparing a plan with actual train arrival or departure time, and sends the adjusted time to ATC vehicle-mounted equipment, and the ATC vehicle-mounted equipment calculates an ATO speed curve by combining equipment states and an authorization terminal transmitted by the rail side; if the times of the trackside ATS and the ATC vehicle-mounted equipment are not synchronous, the running speed of the ATO is influenced, the running time of the train in the interval and the arrival time of the train are influenced, and therefore the punctuality rate is influenced.
In a full-automatic operation line, a train stops at a platform, ATC vehicle-mounted equipment judges the train stop through information acquired by a rail-side transponder and a vehicle-mounted sensor, the train requests the vehicle to remove traction and brake application, after the successful feedback of the vehicle is obtained, the ATC vehicle-mounted equipment sends a door opening command to the vehicle and sends a door opening shielding command through interlocking, rail-side ATS transmits the door opening command to the ATC vehicle-mounted equipment through vehicle-ground wireless communication according to stop time adjusted at morning and evening points, and the ATC vehicle-mounted equipment closes a vehicle door according to the stop time, if the time of the rail-side ATS and the time of the ATC vehicle-mounted equipment are asynchronous, the door opening time is possibly too short, and passengers are influenced to get on.
For a full-automatic operation line, when abnormal jump occurs in external time or the precision of two machines providing a time source end is insufficient, the precision of the next layer of time is often influenced, the non-synchronization of vehicle-mounted equipment and the off-rail time is influenced, and the operation accuracy rate, the passengers getting on or off the train and the like are directly influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a full-automatic train operation signal system based on time synchronization.
The purpose of the invention can be realized by the following technical scheme:
a train full-automatic operation signal system based on time synchronization comprises ATC equipment, ATS equipment, CI equipment, an ATS maintenance platform, MSS equipment, DCS equipment, a communication front-end processor FEP, an application server CATS and a gateway server, and further comprises an external clock system, wherein the external clock system is connected with the application server CATS through the communication front-end processor FEP, the application server CATS is respectively connected with the ATS equipment, the CI equipment, the ATS maintenance platform and the gateway server, the gateway server is respectively connected with the ATC equipment and the DCS equipment, and the ATS maintenance platform is connected with the MSS equipment;
the communication front-end processor synchronizes an external clock system, the inside of the signal system is synchronized by the time acquired by the communication front-end processor, and the time synchronization inside the signal system adopts an NTP protocol.
Preferably, the communication front-end processor FEP adopts a dual hot standby redundancy arrangement, and the two communication front-end processors FEP are in communication connection through a serial port;
the equipment started firstly is a host machine, and then is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured; the communication front-end processor host computer provides a time service end after starting, and the communication front-end processor standby machine stops the time service end.
Preferably, the application servers CATS adopt dual-computer hot standby redundancy, and the two application servers CATS are in communication connection through a serial port;
the equipment started firstly is a host machine, the equipment started later is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured.
Preferably, the gateway servers adopt a dual-computer hot standby redundancy arrangement, and the two gateway servers are in communication connection through a serial port;
the equipment started firstly is a host machine, the equipment started later is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured.
Preferably, the communication front-end processor acquires a time source from the inside of the communication system and appoints that the time source is within a set time deviation range, the communication front-end processor synchronizes the external clock system in real time, if the external clock system abnormally jumps and exceeds the set time deviation, the communication front-end processor judges that the external time has a fault, stops synchronizing the external time source and gives out alarm information, the external clock system recovers to be normal, and a command can be manually input into the communication front-end processor to synchronize the external clock system after confirmation.
Preferably, the signal system is internally synchronized with the time acquired by the communication front-end processor, and ensures that the communication front-end processor host provides the time service end and the standby machine stops providing the time service end.
Preferably, the two application servers synchronously communicate the host time of the front-end processor, the two application servers communicate with each other, one host provides a time service end, and the standby processor stops providing time service;
if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, the application server host and the standby time service are started and closed through the application program control of the application server, and the two application servers are ensured to only provide clock service through the host.
Preferably, the two gateway servers synchronize the host time of the application server, the two gateway servers communicate with each other, one host provides a time service end, and the standby stops providing time service;
if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, and the time service starting and stopping of the gateway server host and the standby machine are controlled by the gateway application program, so that the two gateways are ensured to provide clock service only by the host.
Preferably, the signal system provides time service end equipment, and if the time jump quantity exceeds a set value, the time synchronization service of the lower layer equipment is immediately stopped; when the value is less than the set value, the time synchronization client end completes smooth adjustment within a certain time and is consistent with the time server end.
Preferably, the external clock system is a primary master clock, five subsystems of ATC, ATS, CI, MSS and DCS in the signal system unify time, and the accuracy can reach millisecond level.
Compared with the prior art, the invention has the following advantages:
1. the key equipment and the communication channel of the invention adopt redundancy and are hot standby, thereby avoiding the fault of certain equipment or communication channel and influencing the time of the next layer of equipment and improving the reliability of the system.
2. The invention only provides the time server for the host for all the redundant equipment time servers, thereby avoiding the problem that the time deviation of two pieces of time server equipment influences the time synchronization of the next layer of equipment due to the fault or jump of the two pieces of time server equipment caused by the accidental reason of an operating system or hardware.
3. The time server equipment jumps within a certain time range, and the next-layer equipment can synchronize the time of the time server after smooth adjustment within a certain time, so that the influence of jumping on the full-automatic operation of the train is avoided.
4. The time server equipment jumps for a certain time, and the next-layer equipment can automatically stop synchronizing the time server, so that the full-automatic operation of the train is prevented from being influenced by the overlarge time change of other equipment.
5. The time inside and outside the signal system is synchronized by different methods respectively, so that the defects of the prior art are overcome, and the internal signal system is prevented from being directly influenced by the jump of an external clock;
6. the NTP protocol is adopted in the signal system, and the redundant equipment only provides time service through the host, so that the equipment synchronization precision is ensured, the precision can reach millisecond level, and the requirement of full-automatic operation of the train is met.
The clock synchronization scheme is successfully applied to multiple cities such as Beijing, Shanghai, Chengdu, Wuhan and Shenzhen at present, the clock synchronization scheme runs well, and related faults caused by clock asynchronism do not occur up to now.
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FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The invention relates to a train full-automatic operation signal system based on time synchronization, which comprises:
1. the train full-automatic operation signal system comprises ATC equipment, ATS equipment, CI equipment, MSS equipment and DCS equipment; the ATC equipment and the CI lower computer equipment are equipment for ensuring system safety, the safety level is SIL4, and the ATC equipment and the CI lower computer equipment consist of redundant networks; the safety levels of the ATS equipment and the CI upper computer equipment are SIL2, and the ATS equipment and the CI upper computer equipment consist of another redundant pair of networks; the MSS device is SIL0, consisting of non-redundant networks; the FEP in which the external clock system is connected to ATS equipment, which is connected to SIL4 equipment via a gateway; the ATS equipment is connected to the SIL0 equipment via a service desk.
2. In a full-automatic operation line, in order to realize full-automatic operation of a train, time synchronization of each subsystem of a signal system, particularly time synchronization of signal vehicle-mounted equipment and trackside equipment, must be ensured.
3. In the full-automatic operation line, key equipment and a communication channel in a signal system are in redundant configuration and in a hot standby state, so that the train can still run in a full-automatic mode under the condition that one key equipment or one communication channel fails.
4. The two communication front-end processors FEP are connected and communicated through a network and a serial port, an application program which is started firstly is a host machine, and then the application program which is started is a standby machine; under the condition of unstable network, the state of the other party is obtained through serial port communication, and the redundancy of a communication channel and equipment is ensured; the communication front-end processor host computer provides a time service end after starting, and the communication front-end processor standby machine stops the time service end.
5. The two application servers CATS are connected and communicated through a network and a serial port, an application program which is started firstly is a host machine, and then a standby machine is started; under the condition of unstable network, the state of the other side is obtained through serial port communication, and the communication channel and equipment redundancy are ensured.
6. Two Gateway servers Gateway are connected and communicated through a network and a serial port, an application program which is started firstly is a host computer, and then a standby computer is started; under the condition of unstable network, the state of the other side is obtained through serial port communication, and the communication channel and equipment redundancy are ensured.
7. In a full-automatic operation line, the internal time synchronization of a signal system adopts an NTP (network time protocol) protocol, and the precision is in the millisecond level; the method comprises the steps that a time source is obtained from a clock interface of a communication system through a self-development application program deployed by a communication front-end processor, external time source jumping is avoided, the interior of a signal system is influenced, the communication front-end processor synchronizes the external time source in real time within a certain time deviation range, if the external time source abnormally jumps and exceeds a certain time deviation, the communication front-end processor judges that external time fails, synchronization of the external time source is stopped, alarm information is given, the external time is recovered to be normal, and after confirmation, a command can be manually input into the communication front-end processor to synchronize the external time source.
8. In a full-automatic operation line, a signal system has higher synchronization requirements on trackside equipment and vehicle-mounted equipment, and an external clock system uses a GPS technology to carry out synchronous time calibration so as to avoid generating accumulated errors; the time obtained by the communication front-end processor is used for synchronizing in the signal system, the time server provided by the main machine of the communication front-end processor is ensured, the time server provided by the standby machine is stopped, and the problem that the accuracy and precision of lower-layer time synchronization are influenced due to overlarge time deviation of the two communication front-end processors caused by abnormality of hardware or an operating system when the two communication front-end processors simultaneously provide time service for the next-layer equipment is avoided.
9. In a full-automatic operation line, in order to ensure that a signal system keeps time synchronization between trackside equipment and vehicle-mounted equipment, redundancy configuration is performed on key equipment providing a time service end, and cross connection is performed on the key equipment and next-layer equipment, so that the time synchronization reliability is improved, and as shown in fig. 1, FEP, CATS and Gateway are used as redundant time service ends. For FEP, CATS, Gateway and ATS maintenance platforms, the system is used as a time client to synchronize the clock information of the upper layer, and is used as a time server to provide a time reference for the equipment of the lower layer.
10. In a full-automatic operation line, in order to ensure time precision, the interior of a signal system adopts an NTP protocol for synchronization, two application servers synchronously communicate with the time of a host of a front-end processor, the two application servers communicate with each other, one application server is a master, the other application server is a standby, the host provides a time server, and the standby stops providing time service; if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, the application server host and the standby time service are started and closed through the application program control of the application server, the two application servers are ensured to only provide clock service through the host, and the time deviation of the two application servers is prevented from being too large, so that the time accuracy and precision of the next layer of equipment are not influenced.
11. In a full-automatic operation line, two gateways synchronously apply the time of a server host, the two gateways communicate with each other, one is master and one is standby, the host provides a time service end, and the standby stops providing time service; if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, and the time service of the gateway host and the standby machine is started and closed under the control of the gateway application program.
12. Time server equipment is provided in the signal system, and when the time hopping quantity exceeds a certain numerical value, the time synchronization service of the lower-layer equipment can be stopped immediately, so that the synchronous hopping of other equipment is avoided; when the value is less than a certain value, the time synchronization client-side finishes smooth adjustment within a certain time and is consistent with the time server-side, and jump is avoided.
13. The time server device adopts an SNTP (simple network time protocol), the time precision of the lower layer client device can only reach the second level and can not meet the full-automatic operation requirement, and therefore, the time server device is used as the time server device and is synchronized by adopting the NTP protocol.
14. The ATC, ATS, CI, MSS and DCS subsystems in the signal system have unified time, the precision can reach millisecond level, and the requirement of full-automatic operation of the train is met.
The specific implementation mode is as follows:
as shown in fig. 1, the specific implementation process of the present invention is as follows:
1) the communication front-end processor of the signal system acquires a uniform time source from the clock system through a network, and synchronizes the time of the local operating system after acquiring the time source information.
2) The two communication front-end computers only provide a time service end for the next layer of equipment and the communication front-end computer standby machine, and the communication front-end computer standby machine stops providing the time service end.
3) The communication front-end processor host exits due to the fault of hardware, an operating system or an application program, the communication front-end processor standby application program is upgraded to the host, and a time service end is provided. Aiming at the original host with the fault, the application program is used as a standby machine after being started, the standby machine application program actively stops time service, and if the standby machine application program is not started, the host sends a stop time service command to an operating system of the standby machine, so that only the host provides time service.
4) The two application servers are used as clients to synchronously communicate with the host time of the front-end processor.
5) In the two application servers, only the application server host provides a time server for the next layer of equipment, and the application server standby machine stops providing the time server.
6) The application server host exits due to the failure of hardware, an operating system or an application program, and the application program of the standby application server is upgraded to the host, and meanwhile, a time server is provided. Aiming at the original host with the fault, the application program is used as a standby machine after being started, the standby machine application program actively stops time service, and if the standby machine application program is not started, the host sends a stop time service command to an operating system of the standby machine, so that only the host provides time service.
7) ATS workstation, ATS maintenance platform, ATS station server, and interlocking SDM workstation as client end for synchronizing time of two application server hosts.
8) The two gateways are used as clients to synchronize the time of the application server host.
9) Only the gateway host in the two gateways provides a time server for the next layer of equipment, and the gateway standby machine stops providing the time server.
10) The gateway host exits due to the failure of hardware, an operating system or an application program, the application program of the gateway standby computer is upgraded to the host, and a time server is provided. Aiming at the original host with the fault, the application program is the standby machine after being started, the standby machine application program actively stops time service, and if the standby machine application program is not started, the host sends a stop time service command to the standby machine operating system to ensure that only the host provides time service.
11) The signal network ATC equipment and the DCS equipment are used as clients for synchronizing the time of the host computers in the two gateways;
12) the ATS maintenance station communicates with the MSS subsystem and serves as a server to provide time service for the MSS equipment, and the MSS equipment serves as a client to synchronize the time of the ATS maintenance station.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A train full-automatic operation signal system based on time synchronization comprises ATC equipment, ATS equipment, CI equipment, an ATS maintenance platform, MSS equipment, DCS equipment, a communication front-end processor FEP, an application server CATS and a gateway server, and is characterized in that the signal system further comprises an external clock system, the external clock system is connected with the application server CATS through the communication front-end processor FEP, the application server CATS is respectively connected with the ATS equipment, the CI equipment, the ATS maintenance platform and the gateway server, the gateway server is respectively connected with the ATC equipment and the DCS equipment, and the ATS maintenance platform is connected with the MSS equipment;
the communication front-end processor synchronizes an external clock system, the inside of the signal system is synchronized by the time acquired by the communication front-end processor, and the time synchronization inside the signal system adopts an NTP protocol.
2. The train full-automatic operation signal system based on time synchronization of claim 1, wherein the communication front-end processor FEP adopts a dual hot standby redundancy arrangement, and two communication front-end processors FEP are in communication connection through a serial port;
the equipment started firstly is a host machine, and then is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured; the communication front-end processor host computer provides a time service end after starting, and the communication front-end processor standby machine stops the time service end.
3. The train full-automatic operation signal system based on time synchronization of claim 1, wherein the application servers CATS adopt a dual-computer hot standby redundancy arrangement, and the two application servers CATS are connected through serial communication;
the equipment started firstly is a host machine, the equipment started later is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured.
4. The train full-automatic operation signal system based on time synchronization of claim 1, wherein the gateway server adopts a dual hot standby redundancy arrangement, and two gateway servers are in communication connection through a serial port;
the equipment started firstly is a host machine, the equipment started later is a standby machine, and the host machine and the standby machine acquire the state of the other side through serial port communication under the condition of unstable network, so that redundancy of a communication channel and the equipment is ensured.
5. The system of claim 1, wherein the communication front-end processor obtains a time source from inside the communication system and appoints that the communication front-end processor synchronizes the external clock system in real time within a set time deviation range, and if the external clock system abnormally jumps and exceeds the set time deviation, the communication front-end processor determines that the external time is out of order, stops synchronizing the external time source, and gives an alarm message, the external clock system returns to normal, and after confirmation, a command can be manually input to synchronize the external clock system.
6. The system according to claim 2, wherein the signal system is internally synchronized with the time acquired by the communication front-end processor, and ensures that the communication front-end processor host provides the time service end and the backup stops providing the time service end.
7. The system according to claim 3, wherein two of said application servers synchronously communicate with the time of the host of the front-end processor, the two application servers communicate with each other, one master and one backup, the host provides the time service end, and the backup stops providing the time service;
if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, the application server host and the standby time service are started and closed through the application program control of the application server, and the two application servers are ensured to only provide clock service through the host.
8. The system according to claim 4, wherein two gateway servers synchronize the time of the application server host, the two gateway servers communicate with each other, one master server provides time service, the master server stops providing time service;
if the phenomenon of double hosts occurs, one host application program is automatically withdrawn, and the time service starting and stopping of the gateway server host and the standby machine are controlled by the gateway application program, so that the two gateways are ensured to provide clock service only by the host.
9. The system according to claim 1, wherein a time server is provided in the signal system, and if the time jump amount exceeds a set value, the time synchronization service of the lower layer device is immediately stopped; when the value is less than the set value, the time synchronization client end completes smooth adjustment within a certain time and is consistent with the time server end.
10. The system of claim 1, wherein the external clock system is a primary master clock, five subsystems of ATC, ATS, CI, MSS and DCS in the signal system unify time, and the accuracy can reach millisecond level.
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| CN109367586A (en) * | 2018-10-19 | 2019-02-22 | 卡斯柯信号有限公司 | A kind of city rail traffic signal system clock system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109367586A (en) * | 2018-10-19 | 2019-02-22 | 卡斯柯信号有限公司 | A kind of city rail traffic signal system clock system and method |
Non-Patent Citations (2)
| Title |
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| 景顺利;: "城市轨道交通信号系统时钟同步研究", 信息化研究, no. 04, 20 August 2017 (2017-08-20) * |
| 蒋磊;: "城市轨道交通信号系统时钟不同步故障分析及优化", 湖北农机化, no. 05, 15 March 2020 (2020-03-15) * |
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