阅读说明：本技术 区域控制器在通信列车之间的中间筛选的方法 (Method for intermediate screening of zone controller between communication trains ) 是由 孙利 陈祥 夏庭锴 左辉 王凌雁 于 2021-09-16 设计创作，主要内容包括：本发明提供了一种区域控制器在通信列车之间的中间筛选的方法,包括：当前区域控制器确定上、下游列车是否在其控制内或者与其相邻区域控制器分别控制；包括条件：上游列车静止或向前；下游列车静止；上、下游列车方向相同；上游列车的最小车头位置到下游列车最大车尾位置的距离小于线路上的最小车长；若当前区域控制器确定上、下游列车在其控制内,同时满足上述条件,且满足的时间可以持续列车位置报文的最大有效期,则完成中间筛选；若当前区域控制器与其相邻区域控制器分别控制,同时满足上述条件,且满足的时间可以持续列车位置报文的最大有效期加上相邻两个区域控制器之间报文的最大有效期,则完成中间筛选。该方法能在区域控制器边界处的进行中间筛查。(The invention provides a method for middle screening of a zone controller among communication trains, which comprises the following steps: the current zone controller determines whether the upstream train and the downstream train are controlled in the control of the current zone controller or respectively controlled by the adjacent zone controllers; the method comprises the following conditions: the upstream train is stationary or forward; the downstream train is stationary; the directions of the upstream train and the downstream train are the same; the distance from the minimum head position of the upstream train to the maximum tail position of the downstream train is less than the minimum length of the train on the line; if the current area controller determines that the upstream train and the downstream train are in the control of the current area controller, the conditions are simultaneously met, and the met time can last the maximum validity period of the train position message, finishing intermediate screening; and if the current regional controller and the adjacent regional controller respectively control the current regional controller and the adjacent regional controller, the conditions are simultaneously met, and the met time can last the maximum validity period of the train position message and the maximum validity period of the message between the two adjacent regional controllers, finishing intermediate screening. The method enables intermediate screening at zone controller boundaries.)

1. A method of intermediate screening of zone controllers between communicating trains, comprising:

s100, a current zone controller determines whether an upstream train and a downstream train are in the control of the upstream train and the downstream train or interact with an adjacent zone controller of the upstream train and the downstream train to determine that the upstream train and the downstream train are in the control of the current zone controller and the adjacent zone controller respectively;

s200, the current area controller or the adjacent area controller determines whether the upstream train and the downstream train simultaneously satisfy the following conditions through the received VOBC messages of the upstream train and the downstream train: the upstream train is stationary or forward; the downstream train is stationary; the upstream train and the downstream train have the same direction; the distance from the minimum head position of the upstream train to the maximum tail position of the downstream train is less than the minimum length of the train on the line;

s300, if the current area controller determines that the upstream train and the downstream train are in the control of the upstream train and the downstream train, the conditions in the step S200 are simultaneously met, and the met time can continue the maximum validity period of the VOBC message, deleting the safety protection of the non-communication train between the upstream train and the downstream train by the current area controller, finishing the intermediate screening, or not deleting; if the current region controller interacts with the adjacent region controller, and it is determined that the upstream train and the downstream train are respectively in the control of the current region controller and the adjacent region controller, and the conditions in step S200 are simultaneously met, and the met time can last the maximum validity period of the VOBC message plus the maximum validity period of the message between the two adjacent region controllers, the current region controller deletes the non-communication train security protection between the upstream train and the downstream train, completes the intermediate screening, otherwise does not delete.

2. The method of intermediate screening of zone controllers between communication trains of claim 1, wherein the method of intermediate screening is used for intermediate screening of a current communication train and a first and a second remote communication train respectively corresponding to a head end and a tail end thereof, and comprises:

and calculating whether the head end and the tail end of the current communication train meet the condition of intermediate screening, if the minimum train head position of the current communication train is in the current area controller and the minimum train head position does not move backwards, the head end is met, otherwise, the head end is not met, if the minimum train tail position of the current communication train is in the current area controller and the train is static, the tail end is met, otherwise, the tail end is not met.

3. The method of intermediate screening of zone controllers between communicating trains as recited in claim 2, further comprising determining that the first remote communicating train:

if the first safety protection of the current communication train along the downstream of the locomotive direction is the safety protection of the communication train, and the running direction of the communication train is the same as that of the current communication train and is kept static, the communication train is the first far-end communication train;

if the first safety protection of the current communication train along the downstream of the train head direction is the safety protection of a non-communication train, the first safety protection of the non-communication train along the downstream of the train head direction is the safety protection of a communication train, the running direction of the communication train is the same as that of the current communication train, and the communication train keeps still, the communication train is the first far-end communication train;

if the safety protection of the current communication train is a boundary of a zone controller along the direction downstream of the train head and no safety protection of a non-communication train exists between the safety protection of the current communication train and the boundary of the zone controller or only one safety protection of a non-communication train exists, considering the following three scenes:

scene 1: the first safety protection at the boundary of the adjacent zone controller is the safety protection corresponding to the current communication train; the second safety protection is the safety protection of a non-communication train, the third safety protection is the safety protection of another communication train which is updated according to the position information of the train, the running direction of the communication train is the same as that of the current communication train, and the communication train is kept static, and then the communication train which is updated according to the train position report is the first remote communication train;

scene 2: the first safety protection at the boundary of the adjacent zone controller is the safety protection of a non-communication train; the second safety protection is the safety protection of another communication train updated according to the train position report, the running direction of the communication train is the same as that of the current communication train, and the communication train keeps still, so that the communication train updated according to the train position report is the first remote communication train;

scene 3: and the first safety protection at the boundary of the adjacent zone controller is the safety protection of another communication train updated according to the position report, the running direction of the communication train is the same as that of the current train, and the communication train is kept still, so that the communication train updated according to the train position report is the first remote communication train.

4. The method of inter-train screening of zone controllers between communicating trains of claim 3, further comprising calculating inter-screening state machine hop conditions for a head end and a tail end of the current communicating train in conjunction with the first remote communicating train and the second remote communicating train and obtaining state machine states.

5. The method of inter-train screening of zone controllers between communicating trains as claimed in claim 4, wherein said inter-screening state machine jump condition calculation and acquiring state machine state of the head end of the current communicating train takes into account two scenarios:

scene 1: the minimum tail position of the first remote communication train is within a current zone controller;

scene 2: the minimum tail position of the first remote communication train is in an adjacent zone controller;

the middle screening of the tail end of the current communication train needs to consider the following two scenes:

scene 1: the second remote communication train has a minimum locomotive position within the current zone controller;

scene 2: the minimum locomotive position of the second remote communication train is in the adjacent zone controller.

6. The method of inter-train screening of zone controllers between communicating trains of claim 5,

if the minimum tail position of the first remote communication train is in the current zone controller, entering a state of waiting for synchronization of the first remote communication train is as follows:

a) the position message of the current communication train is effective and the position report is refreshed;

b) the position message of the first remote communication train is effective and is refreshed in the period or the last period;

c) the distance from the minimum head position of the current communication train to the maximum tail position of the first remote communication train is less than the minimum length of the train on the line;

if the above conditions are all satisfied and the ID of the first remote communication train remains unchanged, the intermediate screening state of the head end of the current communication train may be maintained in a state of waiting for synchronization of the first remote communication train;

if the minimum tail position of the first remote communication train is in the current zone controller, the condition for entering the first remote communication train synchronization state is as follows:

a) waiting for a condition of the first remote communication train synchronization state to be satisfied;

b) waiting for the first remote communication train synchronization state to continuously keep at least the maximum validity period of VOBC messages;

c) the ID of the first remote communication train remains unchanged;

after entering this state, the current zone controller may consider the current communication train and the first remote communication train to be synchronized, and may perform a deletion operation for a non-communication train ahead of the current communication train without a hidden non-communication train in between.

7. The method of inter-train screening of zone controllers between communicating trains of claim 5,

if the minimum tail position of the first remote communication train is in the adjacent zone controller of the current zone controller, entering a condition of waiting for the synchronization state of the adjacent zone controller as follows:

a) the position message of the current communication train is effective and refreshed;

b) the messages of the adjacent zone controllers are effective and are refreshed in the period or the last period;

c) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

the maintain wait for neighbor zone controller synchronization state conditions are as follows:

a) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

b) the ID of the first remote train and the ID of the zone controller boundary remain unchanged;

after maintaining the synchronous state of the controllers of the adjacent areas, the controller of the current area starts to send effective intermediate screening information to the controllers of the adjacent areas aiming at the boundary;

entering a state of waiting for the first remote communication train to synchronize is as follows:

a) entering a condition of waiting for the synchronous state of controllers in adjacent areas to be met;

b) the ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the current communication train;

c) the other ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the first remote communication train;

d) the sum of the information of the distance between the maximum tail position of the first remote communication train and the boundary and the distance between the minimum head position of the current communication train and the boundary of the zone controller in the message is less than the minimum train length on the line;

maintaining the wait for the first remote communication train synchronization state condition as follows:

a) maintaining the condition of waiting for the synchronous state of the controllers of the adjacent areas to be established;

b) b and c are established in the condition of entering the synchronous state of the controllers of the adjacent areas;

c) the information of the distance between the maximum tail position of the first remote communication train and the boundary distance in the message is unchanged;

after the first remote communication train synchronization state is maintained, the current area controller continuously sends effective intermediate screening information to the adjacent area controller aiming at the boundary;

a condition for entering the first remote communication train synchronization state:

a) entering a condition of waiting for the synchronization state of the first remote train to be met;

b) waiting for the first remote train synchronization state to continuously keep at least the maximum validity period of the message plus the maximum validity period of the message between two adjacent zone controllers;

after entering the first remote communication train synchronization state, when the local area controller continuously sends effective intermediate screening information to the adjacent area controller aiming at the boundary, if the condition of maintaining and waiting for the first remote communication train synchronization state is satisfied, the first remote communication train synchronization state can be maintained all the time.

8. The method of inter-train screening of zone controllers between communicating trains of claim 7, wherein determining whether automatic protection of a non-communicating train needs to be deleted in conjunction with an inter-screening state machine of communicating trains on both sides of the non-communicating train;

deleting the automatic protection of the non-communication train if the automatic protection of the non-communication train meets the following conditions:

a) the automatic protection of the non-communication train is carried out on two sides of the automatic protection of the communication train, and the running directions of the automatic protection of the non-communication train are the same;

b) the states of the intermediate screening state machines at the ends of the two communication trains close to the non-communication train are both far-end train synchronization states;

c) the two communication trains are remote trains of opposite sides.

Technical Field

The invention relates to the technical field of rail transit signal safety control, in particular to a method for middle screening of a zone controller between communication trains.

Background

In rail transit technology, train position tracking is one of the most basic and important functions of a communication-based train control system (CBTC). In the current system, as shown in fig. 2, a zone controller tracks trains in two ways:

1) when the vehicle-mounted system can position and report the positioning passing message to the area controller, the train tracking carries out train position tracking according to the communication train report position, and the VOBC represents the vehicle-mounted controller.

2) When the vehicle-mounted system cannot report the position to the area controller through the communication network, the train is a non-communication train at the moment, and the train tracking can be carried out only through the zone occupation state.

Moreover, in order to guarantee the operational safety and operational requirements of the trains, the zone controller ZC generally needs to perform intermediate screening of non-communication trains between two closely tracked communication trains. In the prior art, intermediate screening is jointly performed by one zone controller ZC and two communication trains located within the communication range of the same zone controller ZC.

For example, after the upstream Train1 and the downstream Train2 are successfully located, the position information of the trains is sent to the zone controller 1 through the vehicle-mounted controller VOBC, and if the following conditions are met, the zone controller 1 can determine that no non-communication Train exists between the upstream Train1 and the downstream Train2, so that the safety protection of the non-communication Train between the upstream Train1 and the downstream Train2 can be deleted, and intermediate screening is completed.

Condition 1: the zone controller 1 judges whether the distance from the minimum Train head location of the upstream Train1 to the maximum Train tail location of the downstream Train2 is less than the minimum Train length on the line;

condition 2: the position message of the upstream Train1 is refreshed in the current period of the zone controller 1, and the position message of the downstream Train2 is refreshed in the current period or the last period of the zone controller 1;

condition 3: the synchronous clock of the upstream Train1 and the downstream Train2 is less than or equal to 1 hour.

When both the condition 2 and the condition 3 are met, the communication synchronization between the upstream Train1 and the downstream Train2 can be determined, and under the condition of the communication synchronization, the current position information of the upstream Train1 and the downstream Train2 can be used for judging the relative position between the upstream Train and the downstream Train, under the condition, if the condition 1 is met, namely the distance from the minimum head positioning of the upstream Train1 to the maximum tail positioning of the downstream Train2 is smaller than the minimum length on the line, namely a Train cannot be accommodated between the upstream Train and the downstream Train, the safety protection of a non-communication Train between the upstream Train1 and the downstream Train2 can be deleted, and the intermediate screening is completed.

However, the prior art has two disadvantages:

1) when two communication trains are positioned in different zone controllers, the zone controllers cannot complete intermediate screening, so that the operation efficiency of the train control system is influenced;

2) depending on the secure synchronous clock of the line controller LC, intermediate screening cannot be done when no LC device is present.

Therefore, there is a need to provide a method for intermediate screening between communication trains, which can overcome the above two drawbacks.

Disclosure of Invention

The invention provides a method for intermediate screening of zone controllers between communication trains, which can complete intermediate screening when two communication trains are positioned in different zone controllers and does not depend on a safety synchronous clock of a line controller LC.

To achieve the above and other related objects, the present invention provides a method for intermediate screening of zone controllers between communication trains, comprising:

s100, a current zone controller determines whether an upstream train and a downstream train are in the control of the current zone controller or interact with adjacent zone controllers of the upstream train and the downstream train to determine that the upstream train and the downstream train are in the control of the current zone controller and the adjacent zone controllers respectively;

s200, the current area controller or the adjacent area controller determines whether the upstream train and the downstream train simultaneously satisfy the following conditions through the received VOBC messages of the upstream train and the downstream train: the upstream train is stationary or forward; the downstream train is stationary; the upstream train and the downstream train have the same direction; the distance from the minimum head position of the upstream train to the maximum tail position of the downstream train is less than the minimum length of the train on the line;

s300, if the current area controller determines that the upstream train and the downstream train are in the control of the upstream train and the downstream train, the conditions in the step S200 are simultaneously met, and the met time can continue the maximum validity period of the VOBC message, deleting the safety protection of the non-communication train between the upstream train and the downstream train by the current area controller, finishing the intermediate screening, or not deleting; if the current region controller interacts with the adjacent region controller, and it is determined that the upstream train and the downstream train are respectively in the control of the current region controller and the adjacent region controller, and the conditions in step S200 are simultaneously met, and the met time can last the maximum validity period of the VOBC message plus the maximum validity period of the message between the two adjacent region controllers, the current region controller deletes the non-communication train security protection between the upstream train and the downstream train, completes the intermediate screening, otherwise does not delete.

Preferably, the intermediate screening method is used for performing intermediate screening on the current communication train and a first remote communication train and a second remote communication train respectively corresponding to the head end and the tail end of the current communication train, and includes:

and calculating whether the head end and the tail end of the current communication train meet the condition of intermediate screening, if the minimum train head position of the current communication train is in the current area controller and the minimum train head position does not move backwards, the head end is met, otherwise, the head end is not met, if the minimum train tail position of the current communication train is in the current area controller and the train is static, the tail end is met, otherwise, the tail end is not met.

Preferably, the method further comprises determining that the first remote communication train:

if the first safety protection of the current communication train along the downstream of the locomotive direction is the safety protection of the communication train, and the running direction of the communication train is the same as that of the current communication train and is kept static, the communication train is the first far-end communication train;

if the first safety protection of the current communication train along the downstream of the train head direction is the safety protection of a non-communication train, the first safety protection of the non-communication train along the downstream of the train head direction is the safety protection of a communication train, the running direction of the communication train is the same as that of the current communication train, and the communication train keeps still, the communication train is the first far-end communication train;

if the safety protection of the current communication train is a boundary of a zone controller along the direction downstream of the train head and no safety protection of a non-communication train exists between the safety protection of the current communication train and the boundary of the zone controller or only one safety protection of a non-communication train exists, considering the following three scenes:

scene 1: the first safety protection at the boundary of the adjacent zone controller is the safety protection corresponding to the current communication train; the second safety protection is the safety protection of a non-communication train, the third safety protection is the safety protection of another communication train which is updated according to the position information of the train, the running direction of the communication train is the same as that of the current communication train, and the communication train is kept static, and then the communication train which is updated according to the train position report is the first remote communication train;

scene 2: the first safety protection at the boundary of the adjacent zone controller is the safety protection of a non-communication train; the second safety protection is the safety protection of another communication train updated according to the train position report, the running direction of the communication train is the same as that of the current communication train, and the communication train keeps still, so that the communication train updated according to the train position report is the first remote communication train;

scene 3: and the first safety protection at the boundary of the adjacent zone controller is the safety protection of another communication train updated according to the position report, the running direction of the communication train is the same as that of the current train, and the communication train is kept still, so that the communication train updated according to the train position report is the first remote communication train.

Preferably, the method further comprises calculating intermediate screening state machine jumping conditions of the head end and the tail end of the current communication train by combining the first remote communication train and the second remote communication train and acquiring state machine states.

Preferably, the intermediate screening state machine jump condition calculation and the state machine state acquisition of the head end of the current communication train need to consider the following two scenarios:

scene 1: the minimum tail position of the first remote communication train is within a current zone controller;

scene 2: the minimum tail position of the first remote communication train is in an adjacent zone controller;

the middle screening of the tail end of the current communication train needs to consider the following two scenes:

scene 1: the second remote communication train has a minimum locomotive position within the current zone controller;

scene 2: the minimum locomotive position of the second remote communication train is in the adjacent zone controller;

preferably, if the minimum tail position of the first remote communication train is in the current zone controller, the condition for entering the state of waiting for synchronization of the first remote communication train is as follows:

a) the position message of the current communication train is effective and the position report is refreshed;

b) the position message of the first remote communication train is effective and is refreshed in the period or the last period;

c) the distance from the minimum head position of the current communication train to the maximum tail position of the first remote communication train is less than the minimum length of the train on the line;

if the above conditions are all satisfied and the ID of the first remote communication train remains unchanged, the intermediate screening state of the head end of the current communication train may be maintained in a state of waiting for synchronization of the first remote communication train;

if the minimum tail position of the first remote communication train is in the current zone controller, the condition for entering the first remote communication train synchronization state is as follows:

a) waiting for a condition of the first remote communication train synchronization state to be satisfied;

b) waiting for the first remote communication train synchronization state to continuously keep at least the maximum validity period of VOBC messages;

c) the ID of the first remote communication train remains unchanged;

after entering this state, the current zone controller may consider the current communication train and the first remote communication train to be synchronized, and may perform a deletion operation for a non-communication train ahead of the current communication train without a hidden non-communication train in between.

Preferably, if the minimum tail position of the first remote communication train is in a neighboring zone controller of the current zone controller, the condition for entering the state of waiting for synchronization of the neighboring zone controller is as follows:

a) the position message of the current communication train is effective and refreshed;

b) the messages of the adjacent zone controllers are effective and are refreshed in the period or the last period;

c) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

the maintain wait for neighbor zone controller synchronization state conditions are as follows:

a) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

b) the ID of the first remote train and the ID of the zone controller boundary remain unchanged;

after maintaining the synchronous state of the controllers of the adjacent areas, the controller of the current area starts to send effective intermediate screening information to the controllers of the adjacent areas aiming at the boundary;

entering a state of waiting for the first remote communication train to synchronize is as follows:

a) entering a condition of waiting for the synchronous state of controllers in adjacent areas to be met;

b) the ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the current communication train;

c) the other ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the first remote communication train;

d) the sum of the information of the distance between the maximum tail position of the first remote communication train and the boundary and the distance between the minimum head position of the current communication train and the boundary of the zone controller in the message is less than the minimum train length on the line;

maintaining the wait for the first remote communication train synchronization state condition as follows:

a) maintaining the condition of waiting for the synchronous state of the controllers of the adjacent areas to be established;

b) b and c are established in the condition of entering the synchronous state of the controllers of the adjacent areas;

c) the information of the distance between the maximum tail position of the first remote communication train and the boundary distance in the message is unchanged;

after the first remote communication train synchronization state is maintained, the current area controller continuously sends effective intermediate screening information to the adjacent area controller aiming at the boundary;

a condition for entering the first remote communication train synchronization state:

a) entering a condition of waiting for the synchronization state of the first remote train to be met;

b) waiting for the first remote train synchronization state to continuously keep at least the maximum validity period of the message plus the maximum validity period of the message between two adjacent zone controllers;

after entering the first remote communication train synchronization state, when the local area controller continuously sends effective intermediate screening information to the adjacent area controller aiming at the boundary, if the condition of maintaining and waiting for the first remote communication train synchronization state is satisfied, the first remote communication train synchronization state can be maintained all the time.

Preferably, the automatic protection of the non-communication train is determined to be required to be deleted by combining the middle screening state machines of the communication trains on the two sides of the non-communication train;

deleting the automatic protection of the non-communication train if the automatic protection of the non-communication train meets the following conditions:

a) the automatic protection of the non-communication train is carried out on two sides of the automatic protection of the communication train, and the running directions of the automatic protection of the non-communication train are the same;

b) the states of the intermediate screening state machines at the ends of the two communication trains close to the non-communication train are both far-end train synchronization states;

c) the two communication trains are remote trains of opposite sides.

In conclusion, compared with the prior art, the method can solve the problem of intermediate screening of the non-communication train between two rows of closely tracked communication trains at the boundary of the zone controller, thereby improving the operation efficiency of the train control system; in addition, the method does not depend on a safe synchronous clock of the LC, and the complexity of the system is reduced to a certain extent.

Drawings

Fig. 1 is a schematic flow chart of a method for intermediate screening of zone controllers between communication trains according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an internal intermediate screening of a zone controller in a method of intermediate screening between communication trains to delete non-communication train protection between two communication trains according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a regional controller deleting non-communication train protection between two communication trains through intermediate screening at the intermediate side in the method for intermediate screening between communication trains according to an embodiment of the present invention;

fig. 4 is a state machine transition diagram of intermediate screening in a method for intermediate screening between communication trains by a zone controller according to an embodiment of the present invention.

Detailed Description

The method for performing intermediate screening between communication trains according to the present invention will be described in further detail with reference to fig. 1-3 and the detailed description thereof. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a method for intermediate screening between communication trains, as shown in fig. 1, including the following steps:

s100, a current zone controller determines whether an upstream train and a downstream train are in the control of the upstream train and the downstream train or interact with an adjacent zone controller of the upstream train and the downstream train to determine that the upstream train and the downstream train are in the control of the current zone controller and the adjacent zone controller respectively;

s200, the current area controller or the adjacent area controller determines whether the upstream train and the downstream train simultaneously satisfy the following conditions through the received VOBC messages of the upstream train and the downstream train: the upstream train is stationary or forward; the downstream train is stationary; the upstream train and the downstream train have the same direction; the distance from the minimum head position of the upstream train to the maximum tail position of the downstream train is less than the minimum length of the train on the line;

s300, if the current area controller determines that the upstream train and the downstream train are in the control of the upstream train and the downstream train, the conditions in the step S200 are simultaneously met, and the met time can continue the maximum validity period of the VOBC message, deleting the safety protection of the non-communication train between the upstream train and the downstream train by the current area controller, finishing the intermediate screening, or not deleting; if the current region controller interacts with the adjacent region controller, and it is determined that the upstream train and the downstream train are respectively in the control of the current region controller and the adjacent region controller, and the conditions in step S200 are simultaneously met, and the met time can last the maximum validity period of the VOBC message plus the maximum validity period of the message between the two adjacent region controllers, the current region controller deletes the non-communication train security protection between the upstream train and the downstream train, completes the intermediate screening, otherwise does not delete.

In this embodiment, based on the above principle, taking the current passing train as an example, the intermediate screening between the current passing train and the upstream communication train and between the current passing train and the downstream communication train is performed, which includes the following steps:

1. calculating self conditions of the head end and the tail end of the current communication train when intermediate screening is carried out;

the minimum train head position which can carry out intermediate screening by the head end of the current communication train is in the current area controller and cannot move backwards; the conditions of the current communication train tail end that enable intermediate screening are that the minimum tail position of the train is within the current zone controller and the train is stationary.

2. Calculating a first remote communication train and a second remote communication train corresponding to the head end and the tail end of the current communication train;

and if the self condition of the current train middle screening calculated in the step 1 is not met, the corresponding remote communication train is invalid. When calculating a corresponding first remote communication train of a head end of a current communication train, considering that the corresponding first remote communication train keeps still; and when calculating the corresponding second far-end communication train at the tail end of the current communication train, considering that the corresponding second far-end communication train cannot move backwards.

Specifically, the first remote communication train and the second remote communication train must be determined on a case-by-case basis:

if the first safety protection of the current communication Train along the downstream of the Train head direction is the safety protection of the communication Train and the running direction is the same as that of the current communication Train, the first far-end communication Train corresponding to the head end is the Train corresponding to the safety protection, and as shown in fig. 2(a), the first far-end Train corresponding to the Train1 head end is Train 2.

If the first safety protection of the current communication Train along the downstream of the Train head direction is the safety protection of the non-communication Train, the first safety protection of the non-communication Train along the downstream of the Train head direction is the safety protection of the communication Train, and the running direction is the same as that of the current communication Train, the first far-end communication Train corresponding to the head end is the Train corresponding to the safety protection, and as shown in fig. (b), the first far-end Train corresponding to the Train1 head end is Train 2.

If the safety protection of the current communication train is a boundary of a current region controller along the direction of the train head and the downstream of the current communication train is the safety protection of a non-communication train or only one non-communication train exists between the safety protection of the current communication train and the boundary of the current region controller, and the safety protection sequence message sent by the adjacent region controller corresponding to the boundary of the current region controller meets the following conditions, the first far-end communication train corresponding to the head end is a corresponding train in the safety protection sequence message, but the following three scenes must be considered, and the corresponding conditions of each scene are different.

Scene 1: the first safety protection at the boundary of the adjacent zone controller is the safety protection corresponding to the current communication train; the second safety protection is the safety protection of a non-communication Train, the third safety protection is the safety protection of another communication Train updated according to the position information of the Train and the running direction is the same as that of the current communication Train, the first remote communication Train is a Train corresponding to the third safety protection of the adjacent zone controller, and as shown in fig. 3(a), the remote Train corresponding to the head end of Train1 is a communication Train 1;

scene 2: the first safety protection at the boundary of the adjacent zone controller is the safety protection of a non-communication train; the second safety protection is the safety protection of another communication train updated according to the train position report, the running direction of the communication train is the same as that of the current communication train, and the communication train keeps still, so that the communication train updated according to the train position report is the first remote communication train;

scene 3: and (c) if the first safety protection at the boundary of the adjacent zone controller is the safety protection of another communication train updated according to the position report, the running direction of the communication train is the same as that of the current train, and the communication train is kept still, and the communication train updated according to the train position report is the first remote communication train, as shown in fig. 3 (b).

3. And calculating the skip conditions of the intermediate screening state machines at the head end and the tail end of the current communication train and acquiring the states of the state machines by combining the first far-end communication train and the second far-end communication train.

The intermediate screening of the head end of the current communication train needs to consider the following two scenarios:

a) the minimum tail position of the remote communication train is inside the current area controller;

b) the minimum tail position of the remote communication train is positioned in the adjacent zone controller;

similarly, the middle screening of the tail end of the current communication train needs to consider the following two scenarios:

a) the minimum locomotive position of the remote communication train is inside the current area controller;

b) the minimum head position of the remote communication train is in the adjacent zone controller.

(1) For the intermediate screening of the head end of the current communication train, if the minimum tail position of the first remote communication train is in the current area controller, the condition for entering the state of waiting for the synchronization of the first remote communication train is as follows:

a) the position message of the current communication train is effective and the position report is refreshed;

b) the position message of the first remote communication train is effective and is refreshed in the period or the last period;

c) the distance between the minimum head position of the current communication Train and the maximum tail position of the first remote communication Train is less than Train _ Prox _ Dist, wherein Train _ Prox _ Dist is C _ Smallest _ Train _ Length and represents the minimum Train Length in the line.

If the above conditions are all satisfied and the first remote communication train ID remains unchanged, the intermediate screening state of the head-end may be maintained in the wait for first remote communication train synchronization state.

For the intermediate screening of the head end of the current communication train, if the minimum tail position of the first remote communication train is in the current area controller, the condition for entering the synchronization state of the first remote communication train is as follows:

a) waiting for a condition of a first remote communication train synchronization state to be met;

b) waiting for the first remote communication train synchronization state to continuously keep at least Ct _ Max _ VOBC _ ZC _ Delay time;

c) the ID of the first remote communication train remains unchanged.

After entering the state, the current zone controller may consider that the current communication train is synchronized with the first remote communication train, and a hidden non-communication train may not be in the middle, and a deletion operation may be performed for a non-communication train ahead of the current communication train.

For the intermediate screening of the tail end of the current communication train, if the minimum tail end of the second remote communication train is in the current zone controller, the processing method is the same as the head end. The above processing method requires that the minimum head position and the minimum tail position are both in the current zone controller, and thus is an intermediate screen within one zone controller.

(2) To accomplish the intermediate screening of two trains crossing zone controllers, two adjacent zone controllers need to communicate the intermediate screened train information at the boundary between them: the current communication train ID, the State Mid-screening State, the distance information of the minimum Head position from the boundary of the zone controller, Head _ Mid _ Sweep _ Dist, the distance information of the maximum Tail position from the boundary of the zone controller, Tail _ Mid _ Sweep _ Dist and the ID of the remote train.

If the minimum tail position of the first remote communication train is in the adjacent zone controller of the current zone controller, entering a condition of waiting for the synchronization state of the adjacent zone controller as follows:

a) the position message of the current communication train is effective and refreshed;

b) the messages of the adjacent zone controllers are effective and are refreshed in the period or the last period;

c) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

the maintain wait for neighbor zone controller synchronization state conditions are as follows:

a) the distance from the minimum train head position of the current communication train to the boundary of the controller in the downstream area of the current communication train is less than the minimum train length on a line;

b) the ID of the first remote train and the ID of the zone controller boundary remain unchanged;

after maintaining the synchronous state of the controllers of the adjacent areas, the controller of the current area starts to send effective intermediate screening information to the controllers of the adjacent areas aiming at the boundary;

entering a state of waiting for the first remote communication train to synchronize is as follows:

a) entering a condition of waiting for the synchronous state of controllers in adjacent areas to be met;

b) the ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the current communication train;

c) the other ID of the train which is sent by the adjacent zone controller and screened in the middle is the ID of the first remote communication train;

d) the sum of the information of the distance between the maximum tail position of the first remote communication train and the boundary and the distance between the minimum head position of the current communication train and the boundary of the zone controller in the message is less than the minimum train length on the line;

maintaining the wait for the first remote communication train synchronization state condition as follows:

a) maintaining the condition of waiting for the synchronous state of the controllers of the adjacent areas to be established;

b) b and c are established in the condition of entering the synchronous state of the controllers of the adjacent areas;

c) the information of the distance between the maximum tail position of the first remote communication train and the boundary distance in the message is unchanged;

after the first remote communication train synchronization state is maintained, the current area controller continuously sends effective intermediate screening information to the adjacent area controller aiming at the boundary;

a condition for entering the first remote communication train synchronization state:

a) entering a condition of waiting for the synchronization state of the first remote train to be met;

b) waiting for the first remote train synchronization state to continuously keep at least the maximum validity period of the message plus the maximum validity period of the message between two adjacent zone controllers;

after entering the first remote communication train synchronization state, when the local area controller continuously sends valid intermediate screening information to the adjacent area controller for the boundary, if the condition of maintaining the first remote communication train synchronization state is satisfied, the first remote communication train synchronization state can be maintained all the time, and the transition relationship between the states can be referred to in fig. 4.

4. And determining whether the automatic protection of the non-communication train needs to be deleted or not by combining the middle screening state machines of the communication trains on the two sides of the non-communication train.

And if the automatic protection of the non-communication train meets the following conditions, deleting the automatic protection of the non-communication train:

a) the automatic protection of the non-communication train is carried out by the automatic protection of the communication train at two sides and has the same running direction

b) The states of the intermediate screening state machines at the ends of the two communication trains close to the non-communication train are both far-end train synchronization states;

c) the two communication trains are remote trains of opposite sides.

Compared with the prior art, the method has the advantages that the problem of intermediate screening of the non-communication train between two closely tracked communication trains at the boundary of the zone controller can be solved, so that the operation efficiency of a train control system is improved; in addition, the method does not depend on a safe synchronous clock of the LC, and the complexity of the system is reduced to a certain extent.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.