A CTCS-2 level train control vehicle-mounted system background processing method

Abstract

The application provides a CTCS-2 level train control vehicle-mounted system background processing method, which processes train control data of the CTCS-2 level train control vehicle-mounted system in a CTCS-2 level background non-controlled vehicle state, simplifies the operation condition of the vehicle-mounted system, guarantees the data safety of the CTCS-2 level train control vehicle-mounted system when switching from the CTCS-2 level background non-controlled vehicle state to a CTCS-2 level foreground controlled vehicle state, can be applied to the train control vehicle-mounted system of other modes or levels to control train operation, and has great practical value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rail transit train control on-board system, in particular to a CTCS-2 level train control on-board system background processing method. BACKGROUND

[0002] In the technical field of rail transit train control on-board system, the grade switching of CTCS-3 level and CTCS-2 level train control on-board system has been maturely used in trunk railway. Generally, the CTCS-3 level on-board system and the CTCS-2 level on-board system are independently set, or in the case of using the same cabinet, the CTCS-3 level on-board core module and the CTCS-2 level on-board core module are independently set. When the CTCS-2 level on-board system is in the background running state, its functions are still normally running, but its output is cut off through hardware. In the existing implementation scheme, the CTCS-2 level background running condition is not clear, some unnecessary calculations are performed, and faults are easily caused to result in grade switching failure. Therefore, it is an urgent problem to be solved to design an independent CTCS-2 level train control on-board system background processing method to adapt to the function of switching with a variety of other modes or levels of train control on-board system.

[0003] In addition, in the field of urban rail transit, the CBTC on-board system used is different from the mode of the train control on-board system of the railway CTCS system. In order to realize the mode switching of the CTCS-2 level train control on-board system of trunk railway, intercity railway and urban (suburban) railway and the CBTC train control on-board system of urban rail transit, the research on the operation data processing and control technology of the CTCS-2 level train control on-board system in the background non-controlled vehicle state is of great significance.

[0004] It can be understood that the above statements only provide background related to the present application, and do not necessarily constitute prior art. SUMMARY

[0005] The purpose of the present application is to provide a CTCS-2 level train control on-board system background processing method to ensure the data security of the CTCS-2 level train control on-board system switching from the CTCS-2 level background non-controlled vehicle state to the CTCS-2 level foreground controlled vehicle state.

[0006] In order to achieve the above object, the application provides a CTCS-2 level train control vehicle-mounted system background processing method, comprising the following steps: S1, the CTCS-2 level train control vehicle-mounted system is in a CTCS-2 level foreground train control state, and it receives train control data to control the normal operation of the train; when it is needed to switch to other modes or levels of train control vehicle-mounted system to control the train operation, the CTCS-2 level train control vehicle-mounted system receives input signals from the train to make the CTCS-2 level train control state invalid, and the CTCS-2 level train control vehicle-mounted system is switched from the CTCS-2 level foreground train control state to a CTCS-2 level background non-control train state; S2, the CTCS-2 level train control vehicle-mounted system continuously receives train control data; S3, in the CTCS-2 level background non-control train state, the CTCS-2 level train control vehicle-mounted system processes the train control data received in S2; S4, in the CTCS-2 level background non-control train state, and when it is needed to switch to the CTCS-2 level foreground train control state from other modes or levels of train control vehicle-mounted system, the CTCS-2 level train control vehicle-mounted system receives input signals from the train until the input signals are valid for the CTCS-2 level train control state, and then the step S5 is performed; S5, the CTCS-2 level train control vehicle-mounted system judges whether the current state meets the CTCS-2 level foreground train control condition; if yes, the CTCS-2 level train control vehicle-mounted system is switched from the CTCS-2 level background non-control train state to the CTCS-2 level foreground train control state; if no, the CTCS-2 level foreground train control condition is not met, and emergency braking is output.

[0007] Preferably, in S2, the train control data of the CTCS-2 level train control vehicle-mounted system comprises low-frequency codes from track circuits and response data from ground transponders.

[0008] Preferably, in S2, the train control data of the CTCS-2 level train control vehicle-mounted system comprises low-frequency codes from track circuits and response data from ground transponders.

[0009] Preferably, the response data of the ground transponder comprises line speed limit, line slope, temporary speed limit, special section, track circuit information, transponder link information and large number turnout speed limit information.

[0010] Preferably, in S3, when the train enters or exits a side line, the CTCS-2 level train control vehicle-mounted system deletes the train control data when any of the following conditions is met: the side line entry transponder is lost; or, the side line exit transponder is lost; or, a default message is received by the side line entry transponder; or, a default message is received on the track circuit of the exit signal with a transponder; or, the low-frequency code of the track circuit received after the train is received by the side line is UU / UUS code allowing the train to start.

[0011] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0012] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0013] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0014] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0015] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0016] Preferably, in the S3, when the train departs from the sidings, the CTCS-2 train control system deletes the train control data when the following conditions are met: the train is in the station; and the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0017] Preferably, in the S3, when the train enters the track section of the home signal and the low frequency code of the track circuit received is UU / UUS code, the CTCS-2 train control system deletes the special section information whose start position is greater than the position of the home signal; when the train enters the track section of the route / outbound signal and the low frequency code of the track circuit received is UU / UUS code, the special section information is valid and is not received in the station, the CTCS-2 train control system deletes the special section information whose start position is greater than the position of the outbound signal.

[0018] Preferably, in the S3, when the CTCS-2 train control system receives the track circuit code as HB code, the CTCS-2 train control system deletes the train control data.

[0019] Preferably, in the S3, after the CTCS-2 train control system receives the default message, the train control data is deleted.

[0020] Preferably, in the S4, the CTCS-2 foreground train control condition includes two kinds: mode curve monitoring and fixed speed monitoring.

[0021] The mode curve monitoring is that in the CTCS-2 background non-control state, the mode curve can be calculated and the train control condition is met; the fixed speed monitoring is that in the CTCS-2 background non-control state, the mode curve cannot be calculated, but the train is monitored at a fixed speed greater than 0.

[0022] Preferably, the CTCS-2 foreground train control condition is the mode curve monitoring, and the train is monitored according to the dynamic mode curve in the full monitoring mode; the CTCS-2 foreground train control condition is the fixed speed monitoring, and the train is monitored at a fixed speed of 45km / h in the partial monitoring mode.

[0023] Preferably, in the S4, when the following conditions are all met, the train control system outputs the CTCS-2 train control condition as the mode curve monitoring: the line speed limit, the line slope, the temporary speed limit, the track circuit information and the transponder link information of the current position of the train are all valid; the low frequency code of the track circuit received is L5 / L4 / L3 / L2 / L / LU / U2 / U2S / UU / UUS / HU code; and the carrier frequency described in the track circuit information is consistent with the track circuit carrier frequency from the TCR.

[0024] Preferably, in the S4, when the following conditions are all met, the train control system outputs the CTCS-2 train control condition as the fixed speed monitoring: the mode curve monitoring is not met; and the low frequency code of the track circuit received is not the prohibited code.

[0025] Preferably, when any one of the CTCS-2 level foreground control car conditions is met, the CTCS-2 level train control vehicle-mounted system can continue to run step S5.

[0026] Preferably, in S4, if the current state of the CTCS-2 level train control vehicle-mounted system does not meet the CTCS-2 level foreground control car condition, an emergency brake is output.

[0027] Preferably, when any one of the following conditions is met, the vehicle-mounted system outputs that the CTCS-2 level control car condition is not met: the CTCS-2 level train control vehicle-mounted system fails to be down; the mode curve monitoring condition is not met, and the low-frequency code received from the track circuit is a prohibited code.

[0028] The application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the CTCS-2 level train control vehicle-mounted system background processing method.

[0029] The application also provides an electronic device comprising a processor and a memory, wherein the memory has a computer program stored thereon, and the computer program, when executed by the processor, implements the CTCS-2 level train control vehicle-mounted system background processing method.

[0030] Compared with the prior art, the CTCS-2 level train control vehicle-mounted system background processing method provided by the application has at least the following beneficial effects:

[0031] (1) The CTCS-2 level train control vehicle-mounted system background mode is innovatively proposed, and when the CTCS-2 level train control vehicle-mounted system is in the CTCS-2 level background non-control car state, a background mode is always maintained, thereby simplifying the operation condition of the CTCS-2 level train control vehicle-mounted system;

[0032] (2) The data processing method in the CTCS-2 level background mode is proposed, thereby ensuring the data security of the CTCS-2 level train control vehicle-mounted system when switching from the CTCS-2 level background non-control car state to the CTCS-2 level foreground control car state;

[0033] (3) The output signal of the CTCS-2 level train control vehicle-mounted system in the CTCS-2 level background non-control car state can be applied to switching between different levels or systems such as the CTCS-3 level train control vehicle-mounted system and the CBTC vehicle-mounted system, and has great practical value. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The specific flowchart of the CTCS-2 level train control vehicle-mounted system background processing method in the application is shown. DETAILED DESCRIPTION

[0035] The application will be further described by a detailed description of a preferred embodiment with reference to the following drawings in which: Figure 1 The application will be further described by a detailed description of a preferred embodiment with reference to the following drawings in which:

[0036] It is to be understood that the drawings are schematic and not drawn to scale and are merely intended to aid in the description of the application and are not intended to limit the scope of the application in any way, and that any modification, change or adjustment of the structures, or the ratio relationship or size, which does not affect the effects and purposes of the application, shall still fall within the scope of the disclosed technology.

[0037] It is to be understood that, in the present application, the relational terms such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying that there is any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0038] As shown in Figure 1 The application provides a CTCS-2 level train control on-board system background processing method, comprising the following steps:

[0039] S1, the CTCS-2 level train control on-board system is in a CTCS-2 level foreground control state, receives control train data to control normal train operation, when it is needed to be converted to other mode or level train control on-board system to control train operation, the CTCS-2 level train control on-board system receives input signals from the train to make the CTCS-2 level control state invalid, and the CTCS-2 level train control on-board system is converted from the CTCS-2 level foreground control state to a CTCS-2 level background non-control state;

[0040] S2, the CTCS-2 level train control on-board system continuously receives control train data;

[0041] S3, in the CTCS-2 level background non-control state, the CTCS-2 level train control on-board system processes the control train data received in S2;

[0042] S4, in the CTCS-2 level background non-control state, and when it is needed to be converted to the CTCS-2 level foreground control state from other mode or level train control on-board system, the CTCS-2 level train control on-board system receives input signals from the train until the input signals are valid for the CTCS-2 level control state, and then S5 is converted;

[0043] S5, the CTCS-2 level train control vehicle system judges whether the current state meets the CTCS-2 level foreground control train condition; if it meets, the CTCS-2 level train control vehicle system is switched from the CTCS-2 level background non-control train state to the CTCS-2 level foreground control train state; if it does not meet, the CTCS-2 level foreground control train condition is not met, and emergency braking is output.

[0044] Further, it needs to be explained that in S1, the CTCS-2 level control train state includes two kinds of valid and invalid, when the CTCS-2 level control train state is valid, the vehicle system is in the CTCS-2 level foreground control train state; when the CTCS-2 level control train state is invalid, the vehicle system is in the CTCS-2 level background non-control train state.

[0045] Further, the control train data of the CTCS-2 level train control vehicle system includes low frequency code from the track circuit and response data from the ground transponder; it can be understood that in the present application, when the CTCS-2 level train control vehicle system is in the CTCS-2 level background non-control train state, the normal reception of the aforementioned low frequency code from the track circuit and the response data from the ground transponder in the CTCS-2 level train control vehicle system.

[0046] Specifically, the CTCS-2 level train control vehicle system receives the low frequency code of the track circuit through the track circuit reader (TCR) and the antenna, and receives the response data through the transponder receiving unit (BTM) and the antenna.

[0047] The response data of the ground transponder includes: line speed limit, line slope, temporary speed limit, special section (bridge, tunnel, split phase area), track circuit information, transponder link information, and large number turnout speed limit information, etc.

[0048] It can be understood that in the present application, since the CTCS-2 level train control vehicle system must ensure the validity of the data when switching from the CTCS-2 level background non-control train state to the CTCS-2 level foreground control train state, to avoid the occurrence of the situation that the control train data (i.e. the low frequency code of the track circuit and the response data of the ground transponder) used by the CTCS-2 level train control vehicle system does not match the actual route due to route change or abnormal ground signal, therefore, the CTCS-2 level train control vehicle system needs to process the low frequency code from the track circuit and the response data from the ground transponder in real time in the background non-control train state.

[0049] Further, in the S3, the train control data (i.e. the low-frequency code of the track circuit and the response data of the ground transponder) are processed in real time, and the processing specifically includes the following contents:

[0050] A1:

[0051] When the train enters or leaves the station via the side line, the CTCS-2 train control system deletes the train control data when any of the following conditions is met:

[0052] The response data of the side line entering the station is lost;

[0053] Or, the response data of the side line leaving the station is lost;

[0054] Or, the default message is received by the side line entering the station;

[0055] Or, the default message is received on the track circuit of the exit signal with a transponder;

[0056] Or, the low-frequency code of the track circuit received after the train is received by the side line is the UU / UUS code allowing the train to leave.

[0057] A2:

[0058] When the train passes through the side line, the CTCS-2 train control system deletes the train control data when all of the following conditions are met:

[0059] The low-frequency code of the track circuit received by the side line leaving the station is the UU / UUS code;

[0060] And, the type of the exit signal is not "exit signal with transponder";

[0061] And, the train position exceeds the position limit distance of the entry signal; in the preferred embodiment of the present application, the limit distance is 100 meters;

[0062] And, the train is on the track circuit of the exit signal;

[0063] And, when the UU / UUS code is used, the normal braking intervention speed is <50km / h (the time for the vehicle to start from a stationary state to reach a speed of 50km / h), otherwise, when the large number of turnout is effective, the normal braking intervention speed is <(turnout speed limit+5).

[0064] A3:

[0065] When the train leaves the station via the side line, the CTCS-2 train control system deletes the train control data when all of the following conditions are met:

[0066] The train is located in the station;

[0067] And, the low-frequency code of the track circuit changes from HU / HB code to UU / UUS code.

[0068] A4:

[0069] When the balise linking information cannot be covered into the incoming / outgoing balise, the CTCS-2 level train control vehicle-mounted system deletes the train control data when the following conditions are all met:

[0070] The train is in the track section of the incoming / entry route / outgoing signal;

[0071] And, the low-frequency code of the current track circuit is UU / UUS code;

[0072] And, the CTCS-2 level train control vehicle-mounted system has not received the balise linking information or there is a balise loss and the balise linking information is not received again.

[0073] A5:

[0074] If the balise linking information is valid, the low-frequency code of the track circuit received on the track section of the incoming / outgoing, entry route signal is UU / UUS code, when there is a balise loss or a balise message error, the CTCS-2 level train control vehicle-mounted system deletes the existing train control data;

[0075] If the balise linking information is invalid, the low-frequency code of the track circuit received when entering the track section of the incoming / outgoing, entry route signal is UU / UUS code, the CTCS-2 level train control vehicle-mounted system deletes the existing train control data.

[0076] A6:

[0077] If the train control data is incomplete, that is, any one of the line speed limit, the line slope, the temporary speed limit, the track circuit information, and the balise linking information is invalid, and the low-frequency code of the received track circuit is UU / UUS code, the CTCS-2 level train control vehicle-mounted system deletes the train control data;

[0078] When the train control data is complete and has the balise linking information, the CTCS-2 level train control vehicle-mounted system does not delete the train control data.

[0079] A7:

[0080] When the CTCS-2 level train control vehicle-mounted system has the train control data, if the distance not passing the balise for position correction or the distance for position correction according to the linked balise is greater than the maximum error distance, the CTCS-2 level train control vehicle-mounted system deletes the train control data; wherein, in order to consider the safety of train operation, in the preferred embodiment of the present application, the limit distance is 7km, and the maximum error distance is 140m.

[0081] A8:

[0082] When the train enters the track section of the entry signal and the low frequency code of the track circuit received is UU / UUS code, the CTCS-2 train control system deletes the special section information whose start position is greater than the position of the entry signal;

[0083] When the train enters the track section of the route / exit signal and the low frequency code of the track circuit received is UU / UUS code, the special section information is valid and is not newly received in the station, the CTCS-2 train control system deletes the special section information whose start position is greater than the position of the exit signal.

[0084] A9:

[0085] When the CTCS-2 train control system receives the track circuit code as HB code, the CTCS-2 train control system deletes the train control data.

[0086] A10:

[0087] After the CTCS-2 train control system receives the default message, the train control data is deleted.

[0088] It should be noted that in the S4, the CTCS-2 foreground train control condition includes two kinds: mode curve monitoring and fixed speed monitoring; wherein, the mode curve monitoring is that in the CTCS-2 background non-control state, the mode curve can be calculated, and the train control condition is met; the fixed speed monitoring is that in the CTCS-2 background non-control state, the mode curve cannot be calculated, but the train is monitored at a fixed speed greater than 0; it can be understood that when any one of the foregoing CTCS-2 foreground train control conditions is met, the CTCS-2 train control system can be switched to S5 for the next step.

[0089] Specifically, if the CTCS-2 foreground train control condition is mode curve monitoring, the train is monitored according to the dynamic mode curve in the full monitoring mode; if the CTCS-2 foreground train control condition is fixed speed monitoring, the train is monitored at a fixed speed of 45km / h in the partial monitoring mode; if the CTCS-2 train control system does not have the train control condition, it should not be switched to the CTCS-2 foreground train control state, and should output emergency braking.

[0090] Further, in the S4, the CTCS-2 train control system judges whether the current state meets the CTCS-2 foreground train control condition, which specifically includes the following contents:

[0091] B1、

[0092] When the following conditions are all met, the CTCS-2 train control system outputs the CTCS-2 train control condition as mode curve monitoring:

[0093] The line speed limit, line gradient, temporary speed limit, track circuit information, and balise link information of the current position of the train are all valid;

[0094] The low-frequency code of the track circuit received is L5 / L4 / L3 / L2 / L / LU / U2 / U2S / UU / UUS / HU code.

[0095] The carrier frequency of the low-frequency code of the track circuit is consistent with the carrier frequency of the track circuit from the TCR.

[0096] B2,

[0097] When all of the following conditions are met, the CTCS-2 train control system outputs a CTCS-2 train control condition of fixed speed monitoring:

[0098] The mode curve monitoring is not met;

[0099] The low-frequency code of the track circuit received is not a prohibited code (no code, HU code, H code).

[0100] B3,

[0101] When any of the following conditions is met, the CTCS-2 train control system outputs a CTCS-2 train control condition of no train control condition:

[0102] The CTCS-2 train control system is in failure and downtime;

[0103] The mode curve monitoring condition is not met, and the low-frequency code of the track circuit received is a prohibited code.

[0104] In summary, in the present application, when the CTCS-2 train control system receives a CTCS-2 train control state of invalid, it enters the CTCS-2 train control system background mode, and the CTCS-2 train control system always maintains only this mode in the CTCS-2 background non-control state; when the CTCS-2 train control system receives a CTCS-2 train control state of valid and can meet the CTCS-2 foreground control, the CTCS-2 train control system switches to the CTCS-2 foreground control state, and transitions out of the CTCS-2 background non-control state; at this time, if the CTCS-2 foreground control condition is mode curve monitoring, it transitions into full monitoring mode and controls the train according to the dynamic mode curve; if the CTCS-2 foreground control condition is fixed speed monitoring, it transitions into partial monitoring mode and controls the train according to a fixed speed of 45 km / h; if the CTCS-2 train control system does not have a train control condition, it should not switch to the CTCS-2 foreground control state and should output emergency braking.

[0105] In summary, the CTCS-2 level train control vehicle-mounted system background processing method provided by the application innovatively proposes a background mode of the CTCS-2 level train control vehicle-mounted system, always maintains a background mode when the CTCS-2 level train control vehicle-mounted system is in a CTCS-2 level background non-controlled vehicle state, simplifies the operation condition of the CTCS-2 level train control vehicle-mounted system, proposes a data processing method in the CTCS-2 level background mode, guarantees the data security of the CTCS-2 level train control vehicle-mounted system when switching from the CTCS-2 level background non-controlled vehicle state to the CTCS-2 level foreground controlled vehicle state, and proposes an output signal of the CTCS-2 level train control vehicle-mounted system in the CTCS-2 level background non-controlled vehicle state, which is applicable to switching between different levels or systems such as the CTCS-3 level train control vehicle-mounted system and the CBTC vehicle-mounted system, and has great practical value.

[0106] Although the present application has been described in detail by the preferred embodiments above, it should be appreciated that the above description should not be considered as limiting the present application. Various modifications and substitutions to the present application will be apparent to those skilled in the art after reading the above description. Therefore, the scope of the present application should be defined by the appended claims.

Claims

1. A background processing method for a CTCS-2 level train control on-board system, characterized in that, Includes the following steps: The S1 and CTCS-2 level train control on-board systems are in the CTCS-2 level front-end train control state. They receive train control data and control the train to operate normally. When it is necessary to switch to other types or levels of train control on-board systems to control the train, the CTCS-2 level train control on-board system receives input signals from the train and the CTCS-2 level train control state is invalid. The CTCS-2 level train control on-board system then switches from the CTCS-2 level front-end train control state to the CTCS-2 level back-end non-train control state. The S2 and CTCS-2 level train control onboard systems continuously receive train control data; S3. In the CTCS-2 level background non-car control state, the CTCS-2 level train control on-board system processes the car control data received in S2; S4. When the CTCS-2 level back-end non-train control state needs to be switched from another type or level of train control on-board system to the CTCS-2 level front-end train control state, the CTCS-2 level train control on-board system will continue to receive input signals from the train until the input signal is valid for the CTCS-2 level train control state, and then proceed to S5. S5, the CTCS-2 level train control on-board system determines whether the current state meets the CTCS-2 level front-end train control conditions; if it does, the CTCS-2 level train control on-board system switches from the CTCS-2 level back-end non-train control state to the CTCS-2 level front-end train control state; if it does not meet the conditions, the CTCS-2 level front-end train control conditions are not met, and emergency braking is output. In S3, when a train enters or leaves the station via a siding, the CTCS-2 level train control onboard system deletes the train control data if any of the following conditions are met: The siding entry transponder is missing; Or, the siding exit transponder is lost; Alternatively, the siding entry receives a default message; Alternatively, the default message is received on the track circuit of the departure signal with a transponder; Alternatively, the low-frequency code received from the track circuit after siding is a UU / UUS code, indicating a departure signal; wherein, in S3, when the train passes through the siding, the CTCS-2 level train control onboard system deletes the train control data when all of the following conditions are met: The low-frequency code received from the track circuit when departing from the lateral line is UU / UUS code; Furthermore, the departure signal type is not "departure signal with transponder"; Furthermore, the train's position exceeds the distance limit set by the station entry signal; Furthermore, it is located on the track circuit of the exit signal; Furthermore, when using UU / UUS codes, the common braking intervention speed is <50km / h; otherwise, when large-number turnouts are valid, the common braking intervention speed is <(turnout speed limit + 5). In S3, when a train departs from a siding, the CTCS-2 level train control onboard system deletes the train control data if the following conditions are met: The train is located inside the station; Furthermore, the low-frequency code of the track circuit changed from HU / HB code to UU / UUS code; In S3, when the transponder link information cannot cover the incoming / outgoing transponders, the CTCS-2 level train control onboard system deletes the train control data when all of the following conditions are met: The train is in the track section of the entrance / entry / exit signal; Furthermore, the low-frequency code of the current track circuit is UU / UUS code; Furthermore, the CTCS-2 level train control onboard system has not received any transponder link information or has lost a transponder and has not received transponder link information again.

2. The background processing method of the CTCS-2 level train control on-board system as described in claim 1, characterized in that, In S2, the vehicle control data of the CTCS-2 level train control onboard system includes low-frequency codes from the track circuit and response data from the ground transponder; The low-frequency code from the track circuit is received by the track circuit reader and antenna, and the response data from the ground transponder is received by the transponder receiving unit and antenna.

3. The background processing method of the CTCS-2 level train control on-board system as described in claim 2, characterized in that, The response data from the ground transponder includes: track speed limit, track gradient, temporary speed limit, special section, track circuit information, transponder link information, and speed limit information for large-number turnouts.

4. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, if the transponder link information is valid, the low-frequency code of the track circuit received on the track section of the entry / exit station and route signal is UU / UUS code. When there is a transponder loss or transponder message error, the CTCS-2 level train control on-board system deletes the train control data. If the transponder link information is invalid, the low-frequency code received from the track circuit when entering / exiting the station or the track section of the route signal will be UU / UUS, and the CTCS-2 level train control onboard system will delete the train control data.

5. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, if the train control data is incomplete, i.e., any one of the following information is invalid: track speed limit, track gradient, temporary speed limit, track circuit information, or transponder link information, and the received low-frequency code of the track circuit is UU / UUS code, the CTCS-2 level train control onboard system deletes the train control data.

6. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, when the CTCS-2 level train control on-board system has train control data, if it fails to perform position correction via transponder when the distance exceeds the limit or the distance for position correction based on the linked transponder is greater than the maximum error, the CTCS-2 level train control on-board system deletes the train control data.

7. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, when the train enters the track section of the entrance signal and the low-frequency code of the track circuit received is UU / UUS code, the CTCS-2 level train control on-board system deletes the special section information where the starting position of the special section is greater than the position of the entrance signal. When a train enters the track section of the approach / exit signal and the low-frequency code of the track circuit received is UU / UUS, the special section information is valid and was not received within the station. In this case, the CTCS-2 level train control onboard system deletes the special section information where the starting position of the special section is greater than the position of the exit signal.

8. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, when the track circuit code received by the CTCS-2 level train control on-board system is HB code, the CTCS-2 level train control on-board system deletes the train control data.

9. The background processing method of the CTCS-2 level train control on-board system as described in claim 3, characterized in that, In S3, after receiving the default message, the CTCS-2 level train control onboard system deletes the train control data.

10. The background processing method of the CTCS-2 level train control on-board system as described in claim 1, characterized in that, In S4, the CTCS-2 level front-end vehicle control conditions include two types: mode curve monitoring and fixed speed monitoring. The mode curve monitoring is characterized by the ability to calculate the mode curve in the non-vehicle control state of the CTCS-2 level background, thus meeting the conditions for vehicle control. The fixed speed monitoring is characterized by the following: in the CTCS-2 level background non-train control state, the conditions for calculating the mode curve are not available, but the train operation is monitored at a fixed speed greater than 0.

11. The background processing method of the CTCS-2 level train control on-board system as described in claim 10, characterized in that, When the CTCS-2 level control system is in mode curve monitoring, it switches to full monitoring mode and monitors train operation according to dynamic mode curve. The CTCS-2 level front-end train control condition is fixed speed monitoring, which is switched to partial monitoring mode to monitor train operation at a fixed speed of 45km / h.

12. The background processing method of the CTCS-2 level train control on-board system as described in claim 10, characterized in that, In S4, the vehicle system outputs the CTCS-2 level vehicle control condition as the mode curve monitoring when all of the following conditions are met: The current speed limit, gradient, temporary speed limit, track circuit information, and transponder connection information for the train's current location are all valid; Furthermore, the low-frequency code received from the track circuit is L5 / L4 / L3 / L2 / L / LU / U2 / U2S / UU / UUS / HU. Furthermore, the carrier frequency described in the track circuit information is consistent with the track circuit carrier frequency from the TCR.

13. The background processing method of the CTCS-2 level train control on-board system as described in claim 10, characterized in that, In S4, the vehicle system outputs CTCS-2 level vehicle control condition as fixed speed monitoring when all of the following conditions are met: The specified mode curve monitoring is not satisfied; Furthermore, the low-frequency code received from the track circuit is not a prohibition code.

14. The background processing method of the CTCS-2 level train control on-board system as described in claim 10, characterized in that, When any of the CTCS-2 level front-end vehicle control conditions are met, the CTCS-2 level train control on-board system can proceed to step S5 and continue operation.

15. The background processing method of the CTCS-2 level train control on-board system as described in claim 1, characterized in that, In S4, if the current state of the CTCS-2 level train control on-board system does not meet the CTCS-2 level front-end vehicle control conditions, then emergency braking is output.

16. The background processing method of the CTCS-2 level train control on-board system as described in claim 15, characterized in that, The on-board system will output a CTCS-2 level vehicle control condition indicating that vehicle control is not possible when any of the following conditions are met: The CTCS-2 level train control onboard system failed and shut down. The monitoring conditions for the mode curve are not met, and the low-frequency code received from the track circuit is a prohibition code.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the background processing method of the CTCS-2 level train control on-board system as described in any one of claims 1 to 16.

18. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the background processing method of the CTCS-2 level train control on-board system as described in any one of claims 1 to 16.

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