A regression protection method for CBTC system

Abstract

The invention discloses a retreat protection method for a CBTC system, comprising: defining a retreat protection area for each operating direction of each parking point; when a leading vehicle approaches the parking point, establishing a retreat protection area for the leading vehicle according to the operating direction, and determining the main approach path and the protection area range of the rear vehicle; if the retreat protection area of ​​the leading vehicle only overlaps with the protection section of the rear vehicle but does not overlap with the main approach path of the rear vehicle, the retreat protection area blocks the approach path of the rear vehicle only when the leading vehicle overshoots and starts to retreat; when the leading vehicle does not overshoot or has not started to retreat after overshooting, the approach path of the rear vehicle can enter the retreat protection area; after the leading vehicle overshoots, if there is an approach path of the rear vehicle in the retreat protection area, the leading vehicle cannot retreat, and the leading vehicle can retreat only after the rear vehicle stops accurately and unlocks the protection section of the approach path; if the retreat protection area of ​​the leading vehicle overlaps with the main approach path of the rear vehicle, the retreat protection area blocks the approach path of the rear vehicle regardless of whether the leading vehicle overshoots or retreats; after the leading vehicle overshoots, there is no approach path of the rear vehicle in the retreat protection area, and the leading vehicle can retreat. The invention improves the return interval and the transportation capacity of the line.

Description

Technical Field

[0001] The invention relates to a regression protection method for a CBTC system. Background Art

[0002] With the rapid development of urban rail transit, communication-based train control (CBTC) has been widely used. Urban rail transit has become the main mode of travel for urban commuters. With the expansion of cities and the rapid development of urban fringe groups, the passenger flow of many existing lines has exceeded the long-term forecast passenger flow, and the demand for improving line capacity is becoming increasingly strong.

[0003] The definition of rail transit reversal is that when a train exceeds the stop point and is within the allowable reversal range, the train is reversed to the stop point at a low speed. In order to prevent the leading train from speeding out of control and running out of the platform range and colliding with the following train during the reversal process, the system needs to establish a reversal protection area on the outside of the platform according to the distance of the train reversing and applying emergency braking to stop after overspeeding, and establish this area in advance before the leading train enters the station to block the following train from entering this area. After the train stops at the station or confirms to skip the station, the reversal protection area is immediately removed. If the train overshoots, during the train reversal process, the system keeps the reversal protection area blocking the following vehicle until the train stops at the stop point and immediately removes the reversal protection area. In CBTC lines, the probability that the train stops accurately within 0.5m at the station is greater than or equal to 99.9998%, which means that the probability of the train overshooting the stop point and reversing using the reversal protection area is very small. At present, regardless of whether the leading vehicle overshoots and reversing, the reversal protection area must be created in advance to block the following vehicle, resulting in an increase in the tracking interval of the train in the reversing area, which restricts the improvement of transportation capacity. Summary of the invention

[0004] The object of the present invention is to provide a CBTC system retreat protection method to improve the return interval and the line transportation capacity.

[0005] The technical solution to achieve the above purpose is:

[0006] A regression protection method for a CBTC system, comprising:

[0007] Step T1, defining a retreat protection area for each operating direction of each parking spot;

[0008] Step T2: when the front vehicle approaches the parking point, a retreat protection area for the front vehicle is established according to the operating direction, and the main approach path and protection area range of the rear vehicle are determined;

[0009] Step T3, if the retreat protection area of ​​the leading vehicle only overlaps with the protection section of the trailing vehicle, but does not overlap the main body of the trailing vehicle's approach, the retreat protection area blocks the trailing vehicle's approach only when the leading vehicle overshoots and starts to retreat; when the leading vehicle has not overshot, or has not started to retreat after overshooting, the trailing vehicle's approach can enter the retreat protection area; after the leading vehicle overshoots, if there is a trailing vehicle in the retreat protection area, the leading vehicle cannot retreat, and can only retreat after the trailing vehicle stops and unlocks the protection section of the approach;

[0010] Step T4, if the retreat protection area of ​​the front vehicle overlaps with the main approach path of the rear vehicle, the retreat protection area will block the approach path of the rear vehicle regardless of whether the front vehicle is overshooting or retreating; after the front vehicle overshoots, there is no approach path for the rear vehicle in the retreat protection area, and the front vehicle can retreat.

[0011] Preferably, a main route body and a protection area are defined in the forward direction of the train, and the protection area is located in front of the main route body.

[0012] Preferably, each retreat protection area is created when a train approaches in the operating direction and is removed after the train stops or skips a stop point.

[0013] Preferably, in step T3, when the leading vehicle overshoots and starts to reverse, the reverse protection area blocks the way for the rear vehicle. If the switch in the reverse protection area fails, the leading vehicle cancels reverse movement and the rear vehicle can establish a protection section in the reverse protection area. The leading vehicle can choose to skip the station or choose to reverse after the switch failure is restored and the rear vehicle stops at the parking point and unlocks the protection section.

[0014] Preferably, in step T3, after the leading vehicle stops accurately or jumps to a stop at the parking point, the retreat protection area is removed.

[0015] Preferably, in step T4, when the leading vehicle overshoots and starts to reverse, if the switch in the reverse protection area fails, the leading vehicle cancels the reverse, and the reverse protection area still blocks the approach of the rear vehicle; the leading vehicle can choose to skip the station or choose to reverse after the switch fault is restored.

[0016] Preferably, in step T4, after the leading vehicle stops accurately or jumps to a stop at the parking point, the retreat protection area is removed.

[0017] The beneficial effect of the present invention is that when two cars are tracking each other, by comprehensively considering whether the front car starts to retreat at a parking point and whether the rear car is going to enter the parking point of the front car or stop at the previous parking point, the system can use the retreat protection area to block the rear car only when necessary, thereby improving the train turning efficiency and the line's transportation capacity, and at the same time avoiding the formation of a deadlock after the rear car enters the retreat protection area so that the front car cannot retreat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1is a flow chart of a retrograde protection method for a CBTC system of the present invention;

[0019] Figure 2 It is a schematic diagram of the retreat protection area and approach path in the present invention;

[0020] Figure 3 It is a state machine diagram of the train retreat protection area in the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the CBTC system regression protection method of the present invention comprises the following steps:

[0023] Step T1, define a retreat protection area for each operating direction of each stop point (including platform, return track, temporary stop track, etc.). Each retreat protection area is created when the train approaches in the operating direction and is removed after the train stops or skips the stop point. Figure 2 As shown, the schematic diagram of the retreat protection area and approach route.

[0024] Step T2: When the front train approaches the parking point, establish the front train's retreat protection area according to the operating direction, and determine the main route and protection area of ​​the rear train. The main route and protection area are defined in the train's forward direction, and the protection area is located in front of the main route. Figure 2 After the retreat protection area of ​​the leading vehicle is established, it is determined whether the retreat protection area of ​​the leading vehicle blocks the approach of the rear vehicle according to whether the leading vehicle starts to retreat and the nature of the approach of the rear vehicle.

[0025] Step T3, if the reversing protection area of ​​the leading vehicle only overlaps with the protection section of the rear vehicle, but does not overlap the main path of the rear vehicle, the reversing protection area blocks the path of the rear vehicle only when the leading vehicle overshoots and starts to reverse; the path of the rear vehicle can enter the reversing protection area when the leading vehicle has not overshot, or has not started to reverse after overshooting; after the leading vehicle overshoots, if there is a path for the rear vehicle within the reversing protection area, the leading vehicle cannot reverse until the rear vehicle stops and unlocks the protection section of the path.

[0026] Step T4, if the retreat protection area of ​​the front vehicle overlaps with the main approach path of the rear vehicle, the retreat protection area will block the approach path of the rear vehicle regardless of whether the front vehicle overshoots or retreats; after the front vehicle overshoots, since there is no approach path for the rear vehicle in the retreat protection area, the front vehicle can retreat.

[0027] like Figure 3 As shown, the specific application of the present invention is that in a CBTC system, the mobile authorization unit and the on-board controller together complete the safe retreat protection of the overrunning train.

[0028] Figure 3In the , the states of the regression protection area are:

[0029] State S1: not established;

[0030] State S2: Established, the front vehicle does not retreat and does not block the rear vehicle;

[0031] State S3: Established, the front vehicle does not retreat and blocks the rear vehicle;

[0032] State S4: The front vehicle is moving backwards, blocking the rear vehicle.

[0033] The state transition is performed according to the following state transition logic:

[0034] E1: S1 (not established) to S2 (established, the front vehicle does not retreat and does not block the rear vehicle)

[0035] E1_1: First, the retreat protection area of ​​a stop point is not established by any train, and then the front train approaches this stop point and establishes a retreat protection area according to the operating direction. Then the rear train stops at the previous stop point of this stop point, and only the protection section of the approach of the rear train overlaps with the retreat protection area. In this case, the retreat protection area does not block the approach of the rear train, and the rear train can establish a protection section of the approach within the retreat protection area of ​​the front train.

[0036] E2: S2 (established, the front vehicle does not retreat and does not block the rear vehicle) to S1 (not established).

[0037] E2_1: First, a reversal protection area of ​​a parking point is established by the front vehicle, and the front vehicle does not overshoot. The rear vehicle only has an approach protection section that overlaps with the reversal protection area. The rear vehicle can establish a protection section within the reversal protection area, and then remove the reversal protection area after the front vehicle stops at the parking point.

[0038] E2_2: First, a reversal protection area of ​​a parking point is established by the front vehicle, and the front vehicle does not overshoot. The rear vehicle only overlaps the protection section of the approaching route with the reversal protection area. The rear vehicle can establish a protection section within the reversal protection area. Then the front vehicle jumps the parking point and removes the reversal protection area.

[0039] E3: S1 (not established) to S3 (established, the front vehicle does not retreat and blocks the rear vehicle).

[0040] E1_1: First, the retreat protection area of ​​a parking point is not established by any train. Then, the leading train approaches the parking point and a retreat protection area is established by the leading train. At the same time, the main approach of the trailing train overlaps with the retreat protection area. The retreat protection area blocks the approach of the trailing train and the main approach of the trailing train cannot enter the retreat protection area of ​​the leading train.

[0041] E4: S3 (established, the front car does not retreat, blocking the rear car) to S1 (not established).

[0042] E4_1: First, a retreat protection area at a parking point is established by the front vehicle. At the same time, the main approach path of the rear vehicle overlaps with the retreat protection area, and the retreat protection area blocks the approach path of the rear vehicle. Then, after the front vehicle stops at the parking point, the retreat protection area is removed, and the approach path of the rear vehicle is no longer blocked.

[0043] E4_2: First, a retreat protection area at a parking point is established by the front vehicle. At the same time, the main approach of the rear vehicle overlaps with the retreat protection area, and the retreat protection area blocks the approach of the rear vehicle. Then the front vehicle jumps the parking point, removes the retreat protection area, and the approach of the rear vehicle is no longer blocked.

[0044] E5: S2 (established, the front car does not retreat and does not block the rear car) to S4 (the front car retreats and blocks the rear car).

[0045] E5_1: First, a reversing protection area at a parking point is established by the leading vehicle, and the leading vehicle has not started to reversing. The tracking rear vehicle only has an overlapping protection section of the approach route and the reversing protection area. The rear vehicle can establish a protection section within the reversing protection area. After the leading vehicle overshoots, the leading vehicle starts to reversing after the rear vehicle enters the station and stops accurately and unlocks the approach protection section. Then the rear vehicle applies for an approach route to the parking point of the leading vehicle, and the approach route is blocked by the reversing protection area.

[0046] E6: S4 (the front car retreats and blocks the rear car) to S2 (established, the front car does not retreat and does not block the rear car).

[0047] E6_1: First, the leading vehicle overshoots the parking point and is within the reversible range, and has begun to reversal. The protection section of the rear vehicle's approach overlaps with the reversal protection area, and the reversal protection area blocks the rear vehicle's approach. The rear vehicle cannot establish a protection section in the reversal protection area; then the turnout in the reversal protection area fails, the leading vehicle cancels reversal, and the rear vehicle can establish a protection section in the reversal protection area. The leading vehicle can choose to skip the station, or choose to reverse after the turnout fault is restored and the rear vehicle stops at the parking point and unlocks the protection section.

[0048] E7: S3 (established, the front car does not retreat, and the rear car is blocked) to S4 (the front car retreats, and the rear car is blocked).

[0049] E7_1: First, a reversal protection area of ​​a parking point is established by the leading vehicle. The main approach of the rear vehicle overlaps with the reversal protection area. The reversal protection area blocks the approach of the rear vehicle, and the approach of the rear vehicle cannot enter the reversal protection area. Then, the leading vehicle overshoots and starts to reversal, and the reversal protection area continues to block the approach of the rear vehicle.

[0050] E8: S4 (the front car retreats and blocks the rear car) to S3 (established, the front car does not retreat and blocks the rear car).

[0051] E8_1: First, the front car overshoots and starts to retreat. The main route applied by the rear car overlaps with the retreat protection area, and the rear car's route cannot enter the retreat protection area. Then the switch in the retreat protection area fails, the front car cancels retreat, and the retreat protection area still blocks the rear car's route. The front car can choose to skip the station or choose to retreat after the switch fault is restored.

[0052] E9: S4 (the front car retreats and blocks the rear car) to S1 (not established).

[0053] E9_1: First, the leading train overshoots and starts to retreat. The protection section of the trailing train overlaps with the retreat protection area, and the protection section of the trailing train cannot be established in the retreat protection section. Then the train successfully retreats and stops at the stop point. The retreat protection area is removed and the protection section of the trailing train can be established.

[0054] E9_2: First, the front train overshoots and starts to retreat. The main route applied by the rear train overlaps with the retreat protection area. The retreat protection area blocks the rear train's route, and the rear train's route cannot pass through the retreat protection area. Then the train successfully retreats and stops at the stop point. The retreat protection area is removed, and the rear train's route is no longer blocked.

[0055] In summary, after the leading vehicle creates a retreat protection area, the present invention flexibly selects whether to block the trailing vehicle unconditionally or to wait until the leading vehicle actually retreats, depending on whether the trailing vehicle is about to enter the parking spot of the leading vehicle or stops at the previous parking spot. The present invention can not only shorten the turnaround interval and improve the transportation capacity of the line during normal operation, but also can safely retreat after the leading vehicle actually overshoots, without causing a deadlock situation where the leading vehicle cannot retreat.

[0056] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A CBTC system regression protection method, characterized in that: include: Step T1, defining a retreat protection area for each operating direction of each parking spot; Step T2: when the front vehicle approaches the parking point, a retreat protection area for the front vehicle is established according to the operating direction, and the main approach path and protection area range of the rear vehicle are determined; Step T3, if the retreat protection area of ​​the leading vehicle only overlaps with the protection section of the trailing vehicle, but does not overlap the main body of the trailing vehicle's approach, the retreat protection area blocks the trailing vehicle's approach only when the leading vehicle overshoots and starts to retreat; when the leading vehicle has not overshot, or has not started to retreat after overshooting, the trailing vehicle's approach enters the retreat protection area; after the leading vehicle overshoots, if there is a trailing vehicle in the retreat protection area, the leading vehicle cannot retreat, and can only retreat after the trailing vehicle stops and unlocks the protection section of the approach; Step T4: if the retreat protection area of ​​the front vehicle overlaps with the main approach path of the rear vehicle, the retreat protection area blocks the approach path of the rear vehicle regardless of whether the front vehicle overshoots or retreats; after the front vehicle overshoots, there is no approach path for the rear vehicle in the retreat protection area, and the front vehicle retreats; In step T3, when the leading vehicle overshoots and starts to reverse, the reverse protection area blocks the way for the following vehicle. If the switch in the reverse protection area fails, the leading vehicle cancels the reverse and the following vehicle establishes a protection section in the reverse protection area. The leading vehicle chooses to skip the station and also chooses to recover from the switch failure. The following vehicle stops at the parking point and unlocks the protection section before reversing. In step T3, after the preceding vehicle stops at the parking point or skips the parking point, the retreat protection area is removed; In step T4, when the leading vehicle overshoots and starts to retreat, if the switch in the retreat protection area fails, the leading vehicle cancels the retreat, and the retreat protection area still blocks the way for the following vehicle; the leading vehicle chooses to skip the station and also chooses to retreat after the switch fault is restored; In step T4, after the leading vehicle stops accurately or skips the parking spot, the retreat protection area is removed.

2. The CBTC system regression protection method according to claim 1, characterized in that: The main route and the protection area are defined in the forward direction of the train, and the protection area is located in front of the main route.

3. The CBTC system regression protection method according to claim 1, characterized in that: Each retreat protection area is created when the train approaches in the operating direction and is removed after the train stops or skips the stopping point.

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