WO2021012989A1

WO2021012989A1 - Method and system for screening locomotive front vacancy based on train tracking relationship

Info

Publication number: WO2021012989A1
Application number: PCT/CN2020/101848
Authority: WO
Inventors: 岳朝鹏; 于晓泉; 贾云光; 刘军; 杨明春
Original assignee: 北京全路通信信号研究设计院集团有限公司
Priority date: 2019-07-25
Filing date: 2020-07-14
Publication date: 2021-01-28
Also published as: CN110466566A; CN110466566B

Abstract

A method and system for screening locomotive front vacancy based on train tracking relationship. The method comprises: creating a tracking queue of trains entering and exiting a space range based on train sequence, and determining the train number variation and the sequential tracking link relationship in the space range; updating, according to the train number variation and the sequential tracking link relationship in the space range, the tracking link relationship between locomotives and tails of the trains in the space range; and identifying the locomotive front vacancy status of a train according to the updated tracking link relationship. The beneficial effect of the present application is: providing convenience for the quick recovery of a degraded train into a normal train by means of quickly screening the locomotive front vacancy status of the train based on the train tracking link relationship.

Description

Method and system for screening idle front of car based on train tracking relationship

This application claims the priority of Chinese Patent Application No. 201910675404.3 filed on July 25, 2019, and the contents of the above-mentioned Chinese patent application are quoted here in full as a part of this application.

Technical field

The present disclosure belongs to the field of rail transit, and in particular relates to a method and system for screening the vacant front of the train based on the train tracking relationship.

Background technique

In the field of train control systems, when a train is running, it is necessary to confirm the front vacancy status, especially when a degraded train is ready to resume and upgrade to normal running after the train-ground communication is normal, the ground control equipment needs to take safety measures to confirm the front of the train Only idle and no hidden trains can provide normal wireless driving permission commands to trains.

At present, in the CTCS-3 level train control system of the National Railways, the safety measures adopted are to screen whether there are hidden trains in front of the front of the train by reading the track information permission in a specific small area close to the boundary of the track circuit or manually confirming by the driver. As shown in Figure 1, in my country's CTCS-3 train control system, the TAF (Track Ahead Free) confirmation method is adopted. The main steps of the method are:

a) Configure a TAF window and lead range at the end of each block zone;

b) When the vehicle-mounted equipment is in the visual driving mode and the position report is within the pre-configured advance range, the ground radio block center (RBC) will send "TAF request information" to the vehicle-mounted equipment;

c) When the on-board equipment receives the "TAF request information" and the front end of the train has entered the TAF window, the on-board equipment then according to the current received track circuit information (L3, L2, etc. shown in the figure, etc.) indicate that it can move forward, and HU indicates that it must stop. ), automatically send "TAF confirmation message" to RBC;

d) After the RBC receives the "TAF confirmation message", it can consider that there is no hidden car from the front of the car to the end of the blocked zone, and send the normal operation permit command to the car.

In the urban rail CBTC train control method, the safety measure adopted is to check that the distance between the current train position report and the axle counting boundary position is less than the length of the train to confirm that there is no hidden train in front of the front of the train; specifically, as shown in Figure 2, in my country CBTC train control In the system, the "head screening" method is adopted, and the main steps of the method are:

a) Configure the position information of each axle counting boundary or the minimum train length window from the axle counting boundary;

b) When the on-board equipment is in the visual driving mode and the position is reported as close to the position of the axle counting boundary of the train, the ground zone control center (ZC) will compare whether the distance difference between the head position and the axle counting boundary position is less than the line Minimum train length on board;

c) If it is less than, it means that there will be no hidden train in the axle counting section, and a normal operation permit command can be sent to the car.

Although the implementation of the above two measures is different, there is a need to obtain the accurate position of the axle counting boundary or the boundary of the track circuit in the application effect, and it can only be completed in a small area to screen whether there is a hidden train in front of the car. , It also needs to configure a lot of equipment during implementation, while limiting the rapid upgrade and recovery of trains.

Summary of the invention

In response to the above-mentioned problems, the present disclosure provides a method for screening the idle front of the train based on the train tracking relationship, and the method includes:

Create a tracking queue based on the train sequence for the trains entering and leaving the interval, and determine the number of trains within the interval and the sequential tracking link relationship;

According to the change in the number of trains within the interval and the successive tracking link relationship, update the tracking link relationship between the front and rear of the train within the interval;

Identify the idle situation in front of the train head through the updated tracking link relationship.

Further, the method further includes using a detection device to detect the occupancy status of the train within the interval.

Further, the detecting the occupancy status of the train within the interval by using the detecting device includes:

Use the axle counting set at both ends of the interval to detect whether there are no cars in the entire interval;

The track circuits arranged at both ends of the section range are used to detect whether there is a degraded train entering or leaving the section range.

Further, the creating a tracking queue based on the train sequence of trains entering and leaving the interval, and determining the change in the number of trains within the interval and the sequential tracking link relationship includes:

Determine the number and location of trains within the interval at the initial moment;

Define a number for the trains entering the range, where the number represents the train tracking link relationship;

Use the train control system to report the position of trains entering the interval in real time to form a position report;

According to the serial number and the position report, a change in the number of trains within the interval and a tracking link relationship are determined.

Further, the number includes:

Train ID, special ID and 0; among them, the train ID represents a known train number, the special ID represents a downgraded train with an unknown train number, and 0 means no train.

Further, the determining the change in the number of trains within the interval includes:

When a position report shows that the initial position of the train is already within the range, the number of trains entering the range is increased by one;

When there is a position report showing that the initial position of the train is within the range of the station but the access route connected to the section range still exists, the number of trains leaving the corresponding section range is reduced by one.

Further, the determining the change in the number of trains within the section range further includes:

For trains that occupy the stock lane and have no position report, after the interlocking opens the departure route, if any of the following conditions is met, the number of trains entering the interval will be increased by one:

When the end section of the approach is locked, the leaving section will be occupied sequentially;

After the start signal is shut off across pressure and the configured time is exceeded, the departure section changes from idle to occupied;

For trains occupying an approaching section with no position report, after the interlocking opens the pick-up route, if any of the following conditions is met, the number of trains in the corresponding pick-up section is reduced by one:

The first section of the approach is normally unlocked;

After the car-receiving semaphore is closed and the configured time is exceeded, the end of the route changes from idle to occupied.

Further, the updating the tracking link relationship between the front and rear of the train within the interval includes:

For the train that is connected to the train control system for the first time, the tracking link relationship between the front and rear of the train should be updated to have unknown cars;

When the number of trains entering and leaving the interval changes, the tracking link relationship of all trains still in the interval shall be updated;

When an unknown degraded train tracks a known train, the tail tracking link relationship of the known train should be updated to have unknown cars;

When a known train tracks an unknown degraded train, the head tracking link relationship of the known train should be updated to have an unknown train;

When there is a position report showing that the train is not within the range and is stopped, the tracking link relationship between the front and rear of the train should be cleared.

Further, the method further includes canceling train-related information, and the canceling train-related information includes manually canceling or automatically canceling when the updated tracking link relationship shows that there is no known car at the front or rear of the degraded train Cancel the position information and number information of the downgraded train.

The present disclosure also provides a system for screening the vacancy in front of the locomotive based on the train tracking relationship, and the system includes:

A creation system, which is used to create trains entering and leaving the interval into a tracking queue based on the train sequence, and determining the number of trains within the interval and the sequential tracking link relationship;

An update system, the update system is connected to the creation system, and the update system is used to update the tracking link relationship between the front and rear of the train in the interval according to the change in the number of trains in the interval and the sequential tracking link relationship ；

An identification system, where the identification system is connected to the update system, and the identification system is used to identify the idle situation in front of the train head through the updated tracking link relationship.

Further, the system also includes axle counting, track circuit and deregistration system, wherein:

The axle counting is arranged at both ends of the interval range, and the axle counting is used to detect whether there is no car in the entire interval;

The track circuit is arranged at both ends of the interval range, and the track circuit is used to detect whether a degraded train enters or exits the interval range;

A log-off system, the log-off system is configured to log-off the relevant information of the downgraded train when the updated tracking link relationship shows that there is no known car at the front or rear of the downgraded train.

Further, the creation system includes:

A numbering system, the numbering system is used to define a number for the trains entering the range, and the number represents a train tracking link relationship;

A counting system, the counting system is used to record the number of trains entering the interval;

The train control system is used to report the train's position within the interval range in real time to form a position report.

Further, the log-off system adopts a manual log-off or automatic log-off method, and the relevant information of the log-off system to log off a downgraded train includes location information and number information.

The method and system of the present disclosure quickly screen out the idle situation in front of the train head based on the train tracking link relationship, which can provide convenience for the degraded train to quickly return to the normal train. Other features and advantages of the present disclosure will be described in the following specification, and partly become obvious from the specification, or understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained through the structures indicated in the specification, claims and drawings.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 shows a schematic diagram of confirming the front of the train with TAF according to the prior art;

FIG. 2 shows a schematic diagram of confirming the front of the train with the head screen according to the prior art;

FIG. 3 shows a schematic flowchart of a method according to an embodiment of the present disclosure;

Fig. 4 shows a schematic diagram of the configuration of a detection device according to an embodiment of the present disclosure;

FIG. 5 shows a schematic diagram of the increase or decrease of the number of trains in the first train report according to an embodiment of the present disclosure;

FIG. 6 shows a schematic diagram of an increase in the number of positionless trains occupying a stock lane according to an embodiment of the present disclosure;

FIG. 7 shows a schematic diagram of a situation in which the number of positionless trains occupying a stock lane is reduced according to an embodiment of the present disclosure;

FIG. 8 shows a schematic diagram of updating the number of trains and tracking link relationships within an interval according to an embodiment of the present disclosure;

Fig. 9 shows a schematic diagram of a system connection structure according to an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments It is a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

The present disclosure provides a method for screening the free front of the locomotive based on the train tracking relationship. Illustratively, as shown in FIG. 3, the method includes the following steps:

Step 1: Create a tracking queue based on train sequence for trains entering and leaving the interval, and determine the number of trains within the interval and the sequential tracking link relationship;

Specifically, the range of the interval limits the scope of application of the present disclosure to only a single straight line, and the present disclosure cannot be used in areas with branch lines; the branch line areas are only used to identify whether a single line has entered or exited. train.

In order to record the train conditions in the entering and exiting section, the method further includes using a detection device to detect the occupancy state of the train in the section. Specifically, the detecting the occupancy status of the train within the interval range by using the detection device includes: using axle counting arranged at both ends of the interval range to detect whether there are no cars in the entire interval range; The track circuits at both ends detect whether a degraded train enters or exits the section range.

Exemplarily, as shown in Figure 4 below, the section between Station A and Station B is limited to an interval; a section of axle counting is set between the two stations (between Station A and Station B) to check whether the entire interval is There are no cars, and a section of track circuit is set at each end of the section to detect whether there are degraded trains entering and leaving the section. In the station, there is still a section of track circuit for each section to check the train occupancy in the station. There is no need to set up other train occupancy inspection equipment within the section, saving engineering and maintenance costs.

The creation of the trains entering and leaving the interval into a tracking queue based on the train sequence, and determining the change in the number of trains within the interval and the sequential tracking link relationship specifically include:

First, determine the number and positions of trains within the interval at the initial moment; for example, it is detected that the current interval is in an idle state through axle counting and track circuit, so as to determine that there is no train within the interval. When the axle counting detects that there is a train in the interval at the initial time, there is no initial value at this time, and the subsequent logic cannot be executed.

Secondly, define a number for the trains entering the range, the number represents the train tracking link relationship; exemplary, the number is: 0, train ID and special ID; where 0 means no train, train ID ( For example, XXXXX) means a known train number, and a special ID (such as 0xFFFFFFFF) means a degraded train with an unknown train number; the ID of the train will not change from beginning to end. When it is detected that the train enters the range, it is a degraded train, and the ground does not know the train ID, do not know whether there are the same degraded train before and after, consider to the safety side, and speculate that there may be hidden degraded trains before and after the train; therefore, the initial number of the tracking relationship between the degraded train before and after is a special ID.

The degraded train in this embodiment refers to the driver manually driving, through the artificial visual inspection of the line ahead, the safe distance that the train can travel forward is determined independently; the conditions of the degraded train include but are not limited to the following situations, when the normal operation When the train is disconnected from the train control system due to the interruption of the wireless communication between the train and the ground, it will be converted to a degraded train; when the on-board equipment is initially powered on or a special vehicle that is not equipped with a train control vehicle is running online, it will also default to a degraded train .

Then, the train control system is used to report the position of trains entering the interval in real time to form a position report;

Finally, according to the number and the position report, the change in the number of trains within the interval and the tracking link relationship are determined.

Specifically: When the position report detected by the train control system shows that the initial position of the train is within the range, the number of trains that re-enter the range is increased by one; if the position report detected by the train control system indicates that the initial position of the train is within the range of the station And when the pick-up route connected to the section range still exists, the number of trains leaving the corresponding pick-up section range is reduced by one. Exemplarily, as shown in Figure 5 below: Taking the right (station A→station B) as the direction of the train, the axle counting detects that the interval range is idle, and the initial value of the number of trains within the interval range can be determined to be 0; when the position report is When it shows that the train is reported to be in the interval range for the first time, it means that the train control system detects that there is a train in the interval range, and the number is 1. At this time, the number of trains in the interval range is 1; subsequent trains enter the interval range again. The number in the interval is increased by one. For example, the number of the train that enters subsequently is 2, and the number of trains in the interval is 2; when the train with the number 2 enters the interval, the train position relationship is: Within the interval, car 2 is within the interval and is at the rear of car 1; there are no other trains at the rear of car 2. When the position report shows that the train for the first position report is already within the range of the station, such as when the No. 1 train enters the B station, the number of trains in the interval is reduced by one, and the number of trains within the interval is reduced from 2 to 1 , At this time, only car 2 remains in the range.

For trains that occupy the stock lane and have no position report, after the interlocking opens the departure route, if any of the following conditions is met, the number of trains entering the section will be increased by one:

1) When the end section of the approach is locked, the leaving section will be occupied in sequence;

2) After the start signal is closed and the configured time is exceeded, the departure section changes from idle to occupied. As shown in Figure 6 below: in the original section, the number of trains is 1. When the departure station is locked at the end of the departure route and the departure section is occupied in sequence, the number of trains in the section increases from 1 to 2.

For trains occupying an approaching section with no position report, after the interlocking opens the pick-up route, if any of the following conditions is met, the number of trains in the corresponding pick-up section will be reduced by one:

1) The first section of the approach is normally unlocked;

2) After the car-receiving semaphore is closed and the configured time is exceeded, the end of the route changes from idle to occupied. As shown in Figure 7 below: in the original section, the number of trains is 2. When the first section of the pick-up approach is normally unlocked at the pick-up station, the number of trains in the section is reduced from 2 to 1.

In addition, the train control system refers to the train control system based on the wireless communication transmission license, such as the CTCS-3 train control system, the urban rail CBTC train control system, etc. The train can report the location in real time through the wireless nematic control system, and Can form a position report.

Step 2: Update the tracking link relationship between the front and rear of the train in the interval according to the change in the number of trains in the interval and the sequential tracking link relationship; including:

(1) For the train that is connected to the train control system for the first time, the link relationship between the front and rear of the train should be set to have unknown cars;

The train that is connected to the train control system for the first time is because the train has just been connected to the main system. Considering that there may be other downgraded trains on the line that are not connected to the main system, first set the head and tail of the train as If there is an unknown car, the idle status of the front and rear of the train is further determined according to the tracking link relationship; this measure is used to exclude whether there is a degraded train in the forward range of the newly connected train, so as to determine whether the train can be provided with safe driving License information.

(2) When the number of trains entering and leaving the interval changes, the tracking link relationship of all trains still in the interval should be updated;

Exemplarily, when the number of trains in the interval changes from 4 to 5, it means that the link relationship has changed. At this time, the train tracking link relationship in the interval should be updated in time.

(3) If there is an unknown degraded train tracking a known train, the tail tracking link relationship of the known train (regardless of whether the car is degraded or not) should be updated to have an unknown car;

The unknown degraded train is a degraded train before entering the interval range, and the known train is tracked within the interval range, and the tail tracking link relationship of the known train is updated to have an unknown car; the known train can be A normal train can also be a degraded train that is degraded within a section, that is, a known degraded train.

(4) If a known train is tracking an unknown degraded train, the head tracking link relationship of the known train (regardless of whether the car is degraded or not) should be updated to have an unknown car;

(5) When there is a position report that a train is in a station and is stopped, the tracking link relationship between the front and rear of the train should be cleared, so that the tracking link relationship of the train is 0.

Step 3: Identify the idle situation in front of the train head through the updated tracking link relationship;

Specifically, the front vacancy status of the train includes vacant front and not vacant front, vacant front indicates that there is no car ahead, and not vacant front indicates that there is a normal train or a degraded train ahead.

The method further includes canceling the relevant information of the degraded train when the updated tracking link relationship shows that there is no known car at the front or rear of the degraded train.

Specifically, in order to avoid degraded train information always remaining in the train control system and occupying resources, it is necessary to be able to cancel train related information. The related information that is cancelled includes location information and number information. The present disclosure requires that only when there is no known car in the connection relationship between the front and rear of the train, the train can be automatically deregistered after the wireless communication timeout occurs. Otherwise, it is necessary to manually manage the cancellation of trains whose communication timed out. When a normal train leaves the range, it can be cancelled directly.

The present disclosure also provides a system for screening the idle front of the train based on the train tracking relationship. Illustratively, as shown in FIG. 9, the system includes:

A creation system, which is used to create trains entering and leaving the interval into a tracking queue based on the train sequence, and to determine the number of trains within the interval and the sequential tracking link relationship; specifically, the creation system includes : A numbering system, the numbering system is used to define a number for the trains entering the range, the number represents the train tracking link relationship; a counting system, the numbering system is used for the number of trains entering the range The number of trains is recorded; the train control system is used for real-time reporting of the train's position within the interval range to form a position report.

An update system, the update system is connected to the creation system, and the update system is used to update the tracking link relationship between the front and rear of the train in the interval according to the change in the number of trains in the interval and the sequential tracking link relationship.

An identification system, the identification system is connected to an update system, and the identification system is used to identify the idle situation in front of the train head through the updated tracking link relationship.

In order to determine the status of trains entering and exiting the section range, the system further includes an axle counting, track circuit, and cancellation system, wherein the axle counting and the track circuit are connected to a creation system and an update system;

A log-off system, the log-off system is connected to an identification system, and the log-off system is used to log-off the relevant information of the downgraded train when the updated tracking link relationship shows that there is no known car at the front or rear of the downgraded train, so The log-off system is also used to log-off relevant information when the normal train leaves the range; specifically, the log-off system uses manual log-off or automatic log-off to log-off the location information and number information of the downgraded train.

In the system provided by the present disclosure, the number and position of the trains at the initial time within the interval are detected by the axle counting and track circuit. Illustratively, the axle counting and track circuit detect that the current interval is in the idle state, thereby determining the There is no train in the interval; when the axle counting detects that there is a train in the interval at the initial time, the initial position of the normal train can be determined by the train control system.

Then create a tracking queue based on the train sequence through the creation system, and determine the number of trains within the interval and the sequential tracking link relationship; specifically, the creation system includes a numbering system, a counting system, and a train control system; The numbering system defines numbers for the trains entering the interval, wherein the numbers indicate the train tracking link relationship; the counting system records the number of trains entering the interval; and the train control The system reports the train's position in the interval in real time to form a position report. When the number of trains within the interval and the tracking link relationship change, update the tracking link relationship of the train within the interval; specifically including: the train that is connected to the train control system for the first time, the tracking link of the front and rear of the train should be updated The relationship is an unknown car;

Finally, the recognition system is used to identify the idle state in front of the train according to the updated tracking link relationship; when the tracking link relationship shows that there is no known car at the front or rear of the degraded train, the location information and number information of the degraded train are cancelled through the cancellation system.

The present disclosure records the link relationship that is tracked before and after each train, so that when a certain train is reconnected to the train control system, the presence or absence of hidden trains can be excluded through the track link relationship. Exemplarily, as shown in Figure 8: Assume that the line shown in the figure is an interval range, and 4 trains are tracked and run successively on the line within the interval range, all running from right to left; each train records its front and back The associated tracking train number. If the number is 0, it means that there is no tracking train. The trains that enter the interval sequentially are numbered 1, 2, 3, and 4. Suppose that car 3 is downgraded to a degraded train within the interval, and the others are all known trains. When car 3 is reconnected to the train control system after being degraded in the figure, the degraded train has just been connected to the train control system. There may be other degraded trains on the line that are not connected to the train control system. Therefore, the train control system needs to take safety measures to exclude the degraded trains that are not hidden in the forward range of the newly connected trains, so as to provide safe trains for the trains. Driving permit information; at this time, since car 3 is reconnected to the train control system, the tracking link relationship between the front and rear of car 3 should be updated as there is an unknown car, combined with the tracking link relationship record of the train entering the range, you can Determine the tracking link relationship between the front and rear of car 3, you can confirm that there is car 2 in front of car 3 and car 4 behind, and there are no unknown hidden vehicles before and after the car, and you can directly send the driving permission command to car 3 .

Assuming that there are four

trains

1, 2, 3, and 4 in the interval, car 3 is an unknown degraded train, and the others are known trains; before being upgraded to a normal train, when car 4 runs within the interval, that is In order to track unknown degraded trains with known trains, the head link relationship of car No. 4 should be updated to have unknown cars at this time, that is, there is a hidden train at the head of car No. 4, and it is marked as a special number 0xFFFFFFFF. If car 3 is a known degraded train, that is, car 3 is downgraded to a degraded train within the interval. At this time, when car 4 runs within the interval, there is a change in the number of trains in the interval. Update the head link relationship of car #4 to a known degraded train.

Assuming that there are only trains 1, 2, and 3 in the interval, car 3 is a degraded train, and the others are known trains; when car 3 enters the interval, there is an unknown degraded train to track the known train, and the known train should be The tail link relationship of the train is updated to have unknown cars.

Assuming that there are four

cars

1, 2, 3, and 4 in the interval, car 1 leaves this interval, enters the station and stops. At this time, the tracking link relationship between the front and rear of car 1 should be cleared to make it 0; At this time, the number of trains in the interval is updated from 4 to 3; at this time, the train tracking link relationship within the interval is updated; it can be concluded that there is no train in front of the original No. 2 car; other positions and link relationships are temporarily not available There is a change.

The method proposed in the present disclosure does not need to correlate the boundary position of trackside occupancy inspection equipment (such as axle counting, track circuit), thereby reducing dependence on the configuration of the trackside equipment, and correspondingly reducing the measurement and configuration of the boundary position of the trackside equipment The workload of multiple links such as inspection, inspection, etc. improves the efficiency of engineering integration; on the other hand, this method can also be used to improve existing lines. It does not limit the screening of idleness in a small area, as long as the degraded train is reconnected to the train control system. Directly complete the screening and return to the normal operation train, thereby reducing the length and time consumption of the degraded train at low speed, and improving the train operation efficiency.

In addition, the train ID and special ID in the present disclosure are illustrated by simple numerical examples for the convenience of description; the connection described in Figure 9 of the present disclosure and in the system does not represent a direct connection relationship, but refers to a data connection; The train control system described in this article is the main train control system.

Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these Modification or replacement does not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

A method for screening the free front of the train based on the train tracking relationship, characterized in that the method includes:

Create a tracking queue based on the train sequence for the trains entering and leaving the interval, and determine the number of trains within the interval and the sequential tracking link relationship;

According to the change in the number of trains within the interval and the successive tracking link relationship, update the tracking link relationship between the front and rear of the train within the interval;

Identify the idle situation in front of the train head through the updated tracking link relationship.
The method according to claim 1, wherein the method further comprises using a detection device to detect the occupancy status of the train in the interval range based on the train tracking relationship.
The method for screening the vacancy in front of the locomotive based on the train tracking relationship according to claim 2, wherein the detecting the occupancy status of the train within the interval by using the detection device comprises:

Use the axle counting set at both ends of the interval to detect whether there are no cars in the entire interval;

The track circuits arranged at both ends of the section range are used to detect whether there is a degraded train entering or leaving the section range.
The method according to claim 1, wherein the method for screening the front vacancy based on the train tracking relationship is characterized in that the trains entering and leaving the interval range are created as a tracking queue based on the train sequence, and the number of trains in the interval range is determined Changes and sequential tracking links include:

Determine the number and location of trains within the interval at the initial moment;

Define a number for the trains entering the range, where the number represents the train tracking link relationship;

Use the train control system to report the position of trains entering the interval in real time to form a position report;

According to the number and the position report, the change in the number of trains in the section and the tracking link relationship are determined.
The method for screening vacant front of a locomotive based on a train tracking relationship according to claim 4, wherein the number comprises:

Train ID, special ID and 0; among them, the train ID represents a known train number, the special ID represents a downgraded train with an unknown train number, and 0 means no train.
The method for screening vacant front of the train based on the train tracking relationship according to claim 4, wherein the determining the change in the number of trains in the interval includes:

When a position report shows that the initial position of the train is already within the range, the number of trains entering the range is increased by one;

When there is a position report showing that the initial position of the train is within the range of the station but the access route connected to the section range still exists, the number of trains leaving the corresponding section range is reduced by one.
The method for screening vacant trains ahead based on the train tracking relationship according to claim 6, wherein said determining the change in the number of trains in the section further comprises:

For trains that occupy the stock lane and have no position report, after the interlocking opens the departure route, if any of the following conditions is met, the number of trains entering the interval will be increased by one:

When the end section of the approach is locked, the leaving section will be occupied sequentially;

After the start signal is shut off across pressure and the configured time is exceeded, the departure section changes from idle to occupied;

For trains occupying an approaching section with no position report, after the interlocking opens the pick-up route, if any of the following conditions is met, the number of trains in the corresponding pick-up section will be reduced by one:

The first section of the approach is normally unlocked;

After the car-receiving semaphore is closed and the configured time is exceeded, the end of the route changes from idle to occupied.
The method for screening the vacant front of the train based on the train tracking relationship according to any one of claims 1-7, wherein said updating the tracking link relationship of the train's front and rear within the interval includes:

For the train that is connected to the train control system for the first time, the tracking link relationship between the front and rear of the train should be updated to have unknown cars;

When the number of trains entering and leaving the interval changes, the tracking link relationship of all trains still in the interval shall be updated;

When an unknown degraded train tracks a known train, the tail tracking link relationship of the known train should be updated to have unknown cars;

When a known train tracks an unknown degraded train, the head tracking link relationship of the known train should be updated to have an unknown train;

When there is a position report showing that the train is not within the range and is stopped, the tracking link relationship between the front and rear of the train should be cleared.
The method according to any one of claims 1-7, wherein the method further comprises deregistering train-related information, and the deregistering train-related information includes the updated tracking information. When the link relationship shows that there is no known car at the front or rear of the degraded train, the position information and number information of the degraded train will be canceled manually or automatically.
A system for screening the vacant front of the train based on the train tracking relationship, characterized in that the system includes:

A creation system, which is used to create trains entering and leaving the interval into a tracking queue based on the train sequence, and determining the number of trains within the interval and the sequential tracking link relationship;

An update system, the update system is connected to the creation system, and the update system is used to update the tracking link relationship between the front and rear of the train in the interval according to the change in the number of trains in the interval and the sequential tracking link relationship ；

An identification system, the identification system is connected to the update system, and the identification system is used to identify the idle situation in front of the train head through the updated tracking link relationship.
The system for screening the vacant front of the locomotive based on the train tracking relationship according to claim 10, wherein the system further comprises an axle counting, a track circuit and a cancellation system, wherein:

The axle counting is arranged at both ends of the interval range, and the axle counting is used to detect whether there is no car in the entire interval;

The track circuit is arranged at both ends of the interval range, and the track circuit is used to detect whether a degraded train enters or exits the interval range;

A log-off system, the log-off system is configured to log-off the relevant information of the downgraded train when the updated tracking link relationship shows that there is no known car at the front or rear of the downgraded train.
The system for screening the free front of the train based on the train tracking relationship according to claim 10 or 11, wherein the creation system comprises:

A numbering system, the numbering system is used to define a number for the trains entering the range, and the number represents a train tracking link relationship;

A counting system, the counting system is used to record the number of trains entering the interval;

The train control system is used to report the train's position within the interval range in real time to form a position report.
The system according to claim 11 for screening the idle front of the train based on the train tracking relationship, wherein the log-off system adopts a manual log-off or automatic log-off method, and the related information of the log-off system to log off a downgraded train includes location information and number information.