JP2014227058A - On-vehicle device and ground device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a track boundary of a monorail track circuit on an on-vehicle device on the basis of the reception level of signals output from the rail.SOLUTION: An on-vehicle device 30 detects a boundary of a track circuit (track boundary) by comparing the reception level of train control signals output from a rail R with a predetermined determination threshold. The determination threshold is set according to the kind of a track of a next track circuit. In other words, if the next track circuit is a multi-rail, a determination threshold for multi-rails is set, if the next track circuit is a monorail, a determination threshold for monorails which is higher than the determination threshold for multi-rails is set.

Description

  The present invention relates to an on-board device and the like for controlling a train by receiving a train control signal from a rail.

  As train control, a mode is known in which a ground device transmits a train control signal to a rail, and an on-board device mounted on the train performs traveling control of the own train based on the train control signal received from the rail. In this case, the on-board device is required to detect the track circuit boundary (track boundary) as one method for accurately detecting the position of the own train. The detection of the track boundary was performed based on the reception level of the signal from the rail. The train control signal has a different carrier frequency in, for example, adjacent track circuits. Therefore, based on the received train control signal, the signal reception level of the running track circuit is below a predetermined threshold value, and the signal reception level of the next track circuit is above the threshold value. The boundary of the track circuit was detected.

  However, in reality, when passing through the boundary of the track circuit, the reception level of the signal of the track circuit that has advanced does not decrease immediately, and the detection of the track boundary is delayed due to delay in the determination of advancement. there were. Therefore, as disclosed in Patent Document 1, a technique is known in which a reception level threshold for determining whether or not a signal is received is increased by following the previous reception level.

JP 2000-43725 A

  By the way, the track circuit includes a single rail in which only one rail is insulated and a multiple rail in which both rails are insulated. Conventional technology development including Patent Document 1 is mainly intended for multi-track track circuits which are mainstream. However, it is still used in some sections such as a single rail track circuit in the station premises. Compared with a multi-track circuit, a single-track circuit is more likely to cause sneaking and guidance of signals in adjacent or nearby track circuits. For this reason, when the track circuit at the entry destination is a single track circuit, it is difficult to detect the track boundary because the signal reception level of the track circuit adjacent or near is not sufficiently lowered. In addition, a large amount of money is required to upgrade a single rail track circuit to a double rail track circuit.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to detect the track boundary of the single rail track circuit in the on-board device based on the reception level of the signal from the rail. It is to be.

The first invention for solving the above-described problems is
An on-board device (for example, on-board device 30 in FIG. 4) that receives a train control signal transmitted to the track circuit from the rail of the running track circuit and controls the train,
Boundary determination means (for example, the track boundary detection unit 240 in FIG. 4) that compares the reception level of the train control signal with a given threshold condition and determines that it has passed the boundary of the track circuit;
Acquisition means (for example, a determination threshold value setting unit 230 in FIG. 4) for acquiring a track type indicating whether the track circuit next to the running track circuit is a single track or a multi-track track;
A setting unit (for example, a determination threshold setting unit 230 in FIG. 4) that sets the threshold condition according to the acquired trajectory type;
It is an on-vehicle apparatus provided with.

  According to the first aspect of the invention, the on-board device determines that the train control signal received level from the rail has passed the boundary of the track circuit by comparing the reception level of the train control signal with a given threshold condition. It is set according to whether the track circuit next to the running track circuit is a single rail or a double rail.

Specifically, as the second invention,
The setting means sets a first threshold condition when the acquired track type is a double rail, and sets a second threshold condition that is higher than the first threshold condition when the track type is a single rail. Set,
An on-vehicle device may be configured.

  According to the second invention, as the threshold condition, the first threshold condition is set when the next track circuit is a double rail, and the threshold is higher than the first threshold condition when the next track circuit is a single rail. A second threshold condition is set. In a single rail track circuit, signal wraparound and guidance from adjacent or nearby track circuits are more likely to occur than in a multitrack track circuit. That is, when entering a track circuit of a single rail, a signal of an adjacent or nearby track circuit may wrap around and the reception level of the signal may not be sufficiently lowered. For this reason, when the next track circuit is a single rail, the reception level of the train control signal is sufficiently high by setting the second threshold condition, which is higher than the first threshold condition in the case of a multiple rail. Even if it is not lowered, the trajectory boundary can be determined.

Moreover, as 3rd invention, it is the on-vehicle apparatus of 1st or 2nd invention,
The train control signal has a different carrier frequency in the adjacent track circuit,
The boundary determination means changes from a state where the reception level of the first train control signal of the first carrier frequency satisfies the threshold condition to a state where the threshold level is not satisfied, and is different from the first carrier frequency. When the reception level of the second train control signal of the carrier frequency satisfies the threshold condition, it is determined that the track circuit boundary has been passed,
An on-vehicle device may be configured.

  According to the third aspect of the invention, since the carrier frequency of the train control signal differs between adjacent track circuits, the train control signals of the adjacent track circuits can be distinguished. Then, the first train control signal transmitted to the current track circuit is not received, and the second train control signal transmitted to the next track circuit is received. Can be determined.

Moreover, as 4th invention, it is an on-vehicle apparatus of any 1st-3rd invention,
The train control signal includes a track ID of a track circuit in which the train control signal is transmitted,
The boundary determination means is in a state where the reception level of the first train control signal including the first track ID does not satisfy the threshold condition, and the second track is different from the first track ID. When the reception level of the second train control signal including the ID satisfies the threshold condition, it is determined that the boundary of the track circuit has been passed,
An on-vehicle device may be configured.

  According to the fourth aspect, the train control signal of each track circuit can be distinguished from the track ID included in the train signal. Then, the first train control signal transmitted to the current track circuit is not received, and the second train control signal transmitted to the next track circuit is received. Can be determined.

Moreover, as 5th invention, it is the on-vehicle apparatus of 3rd or 4th invention,
The setting means sets a threshold condition for the current track circuit corresponding to the running track circuit and a threshold condition for the next track circuit corresponding to the next track circuit,
The boundary determination means compares the reception level of the first train control signal with the threshold condition for the current track circuit, and compares the reception level of the second train control signal with the threshold condition for the next track circuit. To
An on-vehicle device may be configured.

  According to the fifth aspect, the threshold condition for the current track circuit corresponding to the running track circuit and the threshold condition for the next track circuit corresponding to the next track circuit are set. Then, the reception level of the first train control information of the current track circuit is compared with the threshold condition for the current track circuit, and the reception level of the second control signal information of the next track circuit is set for the next track circuit. Compared to threshold conditions. Thereby, when the single-rail track circuit and the double-track track circuit are adjacent to each other, appropriate threshold conditions can be set for each.

Furthermore, as a sixth invention,
A ground device that performs control to transmit the train control signal corresponding to the track circuit to the rail of the track circuit for each track circuit on which the train on which the on-board device of any one of the first to fifth inventions is mounted travels ( For example, the ground device 10) of FIG. 1 may of course be configured.

The block diagram of a train control system. An example of allocation of the carrier frequency in each track circuit. An example of the reception level in a vehicle-mounted apparatus. The functional block diagram of a vehicle-mounted apparatus. The data structural example of track circuit information. The flowchart of an orbit detection process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the applicable embodiment of the present invention is not limited to this.

[System configuration]
FIG. 1 is a schematic configuration diagram of a train control system 1 of the present embodiment. According to FIG. 1, the train control system 1 includes a ground device 10 and an on-board device 30 mounted on a train 20 that travels on a rail R.

  The ground device 10 is connected to the train advance side of each track circuit installed on the rail R, and transmits a train control signal to the track circuit. These ground devices 10 cause the on-board devices of each train to perform traveling control according to the position of the train on the adjacent track circuit, the route information from the interlocking device, the opening direction information of the branching device, and the like. Is generated for each ground device 10. The train control signal includes a track ID that identifies the track circuit to which the signal is transmitted.

  The on-board device 30 receives a train control signal transmitted to the rail R of the running track circuit, and performs traveling control based on the received train control signal. For example, a speed check pattern based on the received train control signal is created, and speed control (for example, brake control) according to this speed check pattern is performed.

[principle]
(A) Determination of track boundary passage The on-board device 30 determines passage of a track circuit boundary (track boundary) in order to detect the position of the own train 20. The determination of the passage of the track boundary is made based on the reception level of the train control signal received from the rail R. That is, the train control signal reception level from the rail R of the running track circuit is below a predetermined determination threshold, and the train control signal reception level of the next track circuit exceeds the determination threshold, The passage of the boundary between the track circuit and the next track circuit (track boundary) is determined. The determination of the train control signal for each track circuit can be performed using, for example, the track circuit during travel determined from the travel position, the track ID and the carrier frequency included in the train control signal.

(B) Track circuit type (single rail / double rail)
There are two types of track circuits: a multi-track circuit using rail insulation for both rails and a single-track circuit using rail insulation for only one rail.

  FIG. 2 is an example of track circuit installation in a station premises. Illustration of the platform is omitted. In FIG. 2, the main line and the save line are provided on the down line, and track circuits 1T to 4T that are single-rail track circuits and track circuits 0T and 5T that are multi-track tracks are installed. Moreover, 10T and 14T which are a multi-rail track circuit, and track circuits 11T-13T which are single track circuits are installed in the up line. In the figure, “single / multiple” written together in each of the track circuits 0T to 14T represents the type of track circuit (single rail / double rail). Here, the distinction of the single rail / multi-track which is the type of track circuit indicates whether the rail insulation at the boundary on the train entrance side is only one or both.

  A train control signal having a carrier frequency f different from that of the adjacent track circuit T is transmitted to each track circuit T from the ground device 10 provided on the train advance side. The train control signal of each track circuit T can be distinguished by the difference in the carrier frequency f.

  In the example shown in FIG. 2, a train control signal having a carrier frequency f1 is transmitted to the track circuits 1T and 14T, a train control signal having a carrier frequency f2 is transmitted to the track circuits 2T, 11T, and 13T, and the train signals are conveyed to the track circuits 3T and 10T. A train control signal having a frequency f3 is transmitted, a train control signal having a carrier frequency f4 is transmitted to the track circuits 4T and 12T, and a train control signal having a carrier frequency f5 is transmitted to the track circuits 0T and 5T.

  However, in a single rail track circuit, a train control signal is likely to leak to an adjacent or neighboring track circuit because of a structure, and conversely, a train control signal of an adjacent or neighboring track circuit is likely to wrap around. For this reason, in the on-board apparatus 30, not only the train control signal of the track circuit currently on track but the situation where the train control signal of another track circuit is received occurs. In the example shown in FIG. 2, the train control signal having the carrier frequency f4 is transmitted from the ground device to the track circuit 4T, and the train control signals having the carrier frequencies f2 and f3 of the adjacent track circuits 2T and 3T wrap around. (In other words, it can leak.) In addition, a train control signal of the carrier frequency f3 is transmitted from the ground device to the track circuit 3T, and the train control signal of the carrier frequency f1 of the adjacent track circuit 1T and each of the nearby track circuits 2T and 12T are carried. Train control signals with frequencies f2 and f4 wrap around.

  The on-board device 30 determines the track boundary by comparing the reception level of the train control signal with a predetermined determination threshold. However, when entering the single rail track circuit, the train control signal of the advanced track circuit leaks to the entered track circuit (in other words, it can be said to wrap around), so the train control signal of the track circuit that should have advanced has been received. The level did not decrease sufficiently, and it was a factor that could not judge the passage of the orbit boundary.

(C) Determination threshold In this embodiment, the determination threshold of a track boundary is changed according to the type of track circuit (single rail / multi-track). Specifically, when the next track circuit is a multi-track track circuit, the multi-track determination threshold (first determination threshold) is used, and when the next track circuit is a single-track track circuit, the single track is higher than the multiple-track determination threshold. The determination threshold for use (second determination threshold).

  FIG. 3 is an example of the reception level of the control signal. FIG. 3A shows changes in the reception levels of the train control signals F1 and F5 in a train (on-board device) traveling on the continuous track circuits 1T and 0T. The track circuit 1T is a single-rail track circuit, and the track circuit 0T is a multiple-track track circuit. Train control signals F1 and F5 having carrier frequencies f1 and f5 are transmitted to the track circuits 1T and 0T, respectively.

  The track circuit 1T receives the train control signal F1. Next, when the track circuit 1T is advanced to enter the next track circuit 0T, the reception level of the train control signal F1 of the advanced track circuit 1T decreases, and the train control signal F5 of the entered track circuit 0T is received. At this time, since the track circuit 0T is a double-track track circuit, the train control signal F1 of the adjacent track circuit 1T that has advanced immediately before is hardly received, and the reception level thereof is greatly reduced. Then, the boundary between the track circuits 1T and 0T is determined using the determination threshold for multiple rails. That is, when the reception level of the train control signal F1 is less than the determination threshold for the multi-rail and the reception level of the train control signal F5 is equal to or higher than the determination threshold for the multi-rail, the passage of the boundary between the track circuits 1T and 0T is performed. Determined.

  FIG. 3B shows a change in the reception level of the train control signals F3 and F1 in a train (on-board device) traveling on the continuous track circuits 3T and 1T. The track circuits 3T and 1T are single rail track circuits. Further, train control signals F3 and F1 having carrier frequencies f3 and f1 are transmitted to the track circuits 3T and 1T, respectively.

  The track circuit 3T receives the train control signal F3. Next, when the track circuit 3T is advanced to enter the next track circuit 1T, the reception level of the train control signal F3 of the advanced track circuit 3T is lowered, and the train control signal F1 of the entered track circuit 1T is received. At this time, since the track circuit 1T is a single-track track circuit, the control signal F3 of the adjacent track circuit 3T that has advanced immediately before (around leak) or the signal from the adjacent or nearby track circuit occurs. However, the decrease in the level is small compared to the double-track track circuit. Therefore, the boundary between the track circuits 3T and 1T is determined using the single rail determination threshold. That is, when the reception level of the train control signal F3 is less than the single rail determination threshold value and the reception level of the train control signal F1 is equal to or higher than the single rail determination threshold value, the passage of the boundary between the track circuits 3T and 1T is not performed. Determined.

[Function configuration]
FIG. 4 is a functional configuration diagram of the on-vehicle device. According to FIG. 4, the on-board device 30 includes a receiving unit 110, a demodulating unit 120, a processing unit 200, and a storage unit 300.

  The receiving unit 110 receives the train control signals for the n types of carrier frequencies f1 to fn transmitted to the rail R via the power receiver 22. The demodulator 120 demodulates the train control signals for the carrier frequencies f1 to fn received by the receiver. Although the reception unit 110 and the demodulation unit 120 are illustrated as separate processing blocks, it is a matter of course that they may be configured as an integrated device (module). Moreover, in order to receive and demodulate train control signals of n types of carrier frequencies f1 to fn, n types of channel circuits may be provided and each channel circuit may receive and demodulate corresponding train control signals.

  The processing unit 200 is realized by an arithmetic device such as a CPU, for example, and performs overall control of the on-board device 30 based on a program and data stored in the storage unit 300, data received via the power receiver 22, and the like. In addition, the processing unit 200 includes a position / velocity calculation unit 210, a speed check unit 220, a determination threshold setting unit 230, and a trajectory boundary detection unit 240.

  The position speed calculation unit 210 calculates the current travel position (travel distance or kilometer) of the own train and the travel speed based on the measurement value of the speed generator 21 attached to the axle.

  The speed check unit 220 performs traveling control based on the train control signal received from the rail via the power receiver 22. Specifically, based on the track conditions, the running performance of the own train, etc., a speed check for stopping at a specified stop target is performed. That is, the verification speed at the current travel position is compared with the current travel speed. If the travel speed exceeds the verification speed, the brake is operated to decelerate.

  The determination threshold setting unit 230 sets a determination threshold for the orbit boundary. That is, with reference to the track circuit information 320, the next track type (single track / multitrack) of the track circuit currently running is acquired. If the next track circuit is a multi-rail circuit, the multi-rail determination threshold is set. If the next track circuit is a single-track track circuit, the single-track determination threshold is set. At this time, the running track circuit and the next track circuit are determined from the current running position calculated by the position / velocity calculation unit 210 and the track circuit information 320. In addition, the setting values of the multi-rail determination threshold and the single-rail determination threshold are stored as determination threshold information 330.

  The track boundary detection unit 240 determines the passage of the track circuit boundary (track boundary) based on the reception level of the train control signal received from the rail. More specifically, when the reception level of the train control signal (current track signal: first train control signal) of the running track circuit is less than the determination threshold, it is determined that there is no signal, and When the reception level of the train control signal (next track signal: second train control signal) of the next track circuit is equal to or higher than the determination threshold, it is determined that the signal has passed the track boundary when it is determined that the signal is present. At this time, the running track circuit and the next track circuit are determined from the current running position calculated by the position / velocity calculation unit 210 and the track circuit information 320. Further, from the track ID included in the received train control signal, the track circuit corresponding to the signal is determined, thereby determining the track circuit that is running, referring to the track circuit information 320, and The track circuit can be determined. The train control signal of the running track circuit (first train control signal) and the train control signal of the next track circuit (second train control signal) are adjacent track circuits, so the carrier frequency is different, Also, the trajectory ID is different.

  FIG. 5 is a diagram illustrating an example of a data configuration of track circuit information. According to FIG. 5, the track circuit information 320 stores the track ID 321 and the track type 322 in association with each track circuit constituting the line section.

  The storage unit 300 is realized by a storage device such as a ROM, a RAM, and a hard disk. The storage unit 300 stores programs, data, and the like for the processing unit 200 to control the on-board device 30 in an integrated manner. It is used as an area and temporarily stores the calculation result executed by the processing unit 200, data received via the power receiver 22, and the like. In the present embodiment, a track boundary determination program 310, track circuit information 320, and determination threshold information 330 are stored.

[Process flow]
FIG. 6 is a flowchart for explaining the flow of the trajectory boundary determination process executed by the processing unit 200. In the processing unit 200, in addition to the trajectory boundary determination process, a travel position and travel speed calculation process by the position speed calculation unit 210, a speed check process by the speed check unit 220, and the like are performed in parallel.

  First, the determination threshold setting unit 230 determines the track type of the next track circuit, and sets the determination threshold according to the determined track type of the next track circuit. That is, if the track type of the next track circuit is a multi-rail (step A1: YES), a multi-rail determination threshold is set as the determination threshold (step A3), and if it is a single rail (step A1: NO), the determination threshold As described above, a single-rail determination threshold is set (step A5). Next, the track boundary detection unit 240 compares the reception level of the train control signal (current track signal) of the running track circuit with the determination threshold, and the reception level of the current track signal falls below the determination threshold (the threshold condition is satisfied). If not (step A7: YES), it is determined that no train control signal has been received (step A9).

  Thereafter, if the reception level of the current orbit signal is equal to or higher than the determination threshold again (step A11: YES), it is determined that the current orbit signal is momentarily interrupted (step A13), and the process returns to step A7. If the train control signal (next track signal) of the next track circuit is received and the reception level is equal to or higher than the determination threshold value (the threshold condition is satisfied) (step A15: YES), the next track signal is received. (Step A17), it is determined that the vehicle has passed the boundary (track boundary) between the running track circuit and the next track circuit (Step A19). Thereafter, the process returns to step A1 and the same process is performed for the next orbit boundary.

[Function and effect]
As described above, according to the present embodiment, the on-board device 30 compares the reception level of the train control signal from the rail R with the predetermined determination threshold (threshold condition), so that the boundary of the track circuit (track boundary). This threshold value is set according to the track type of the next track circuit. That is, if the next track circuit is a multi-rail, a multi-rail determination threshold is set, and if it is a single-rail, a single-rail determination threshold higher than the multi-rail determination threshold is set. As a result, the track boundary can be reliably detected even for a single rail track circuit in which the reception level of the train control signal of another track circuit is not sufficiently lowered due to wraparound (leakage) or guidance.

[Modification]
It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can of course be changed as appropriate without departing from the spirit of the present invention.

(A) Determination threshold In the above-described embodiment, the current track determination threshold or the next track determination threshold is set as the determination threshold according to the type of the next track circuit, and the train control signal (current track) of the current track circuit is set. Signal) and the signal level of the train control signal (next track signal) of the next track circuit were compared with this judgment threshold, and this was set for each of the current track circuit and the next track circuit. May be. Specifically, a judgment threshold value (current trajectory judgment threshold value) corresponding to the trajectory type of the current track circuit is set, and a judgment threshold value (next trajectory judgment threshold value) corresponding to the trajectory type of the next track circuit is set. To do. Then, the presence or absence of the current orbit signal is determined by comparing the reception level of the current orbit signal with the determination threshold for the current orbit, and the reception level of the next orbit signal is compared with the determination threshold for the next orbit signal. Determine the presence or absence of a signal.

(B) Acquisition of track type In the above-described embodiment, the track type of the next track circuit is acquired with reference to the track circuit information 320. However, this may be acquired from the train control signal. good. Specifically, the train control signal transmitted to each track circuit includes information indicating the track type of the track circuit next to the track circuit. Then, the on-board device sets a determination threshold for the track boundary between the current track circuit and the next track circuit in accordance with the track type of the next track circuit included in the received train control signal.

DESCRIPTION OF SYMBOLS 1 Train control system 10 Ground apparatus 20 Train 21 Speed generator, 22 Power receiver, 23 Brake mechanism 30 On-board apparatus 110 Reception part, 120 Demodulation part 200 Processing part 210 Position speed calculation part, 220 Speed check part 230 Judgment threshold setting part , 240 orbit boundary detection unit 300 storage unit 310 orbit boundary determination program, 320 orbit circuit information, 330 determination threshold information R rail

Claims (6)

An on-board device that controls a train by receiving a train control signal transmitted to the track circuit from a rail of a running track circuit,
Boundary determination means for comparing the reception level of the train control signal with a given threshold condition to determine that the boundary of the track circuit has been passed;
An acquisition means for acquiring a track type indicating whether the track circuit next to the running track circuit is a single rail or a double rail;
Setting means for setting the threshold condition according to the acquired trajectory type;
On-vehicle device with The setting means sets a first threshold condition when the acquired track type is a double rail, and sets a second threshold condition that is higher than the first threshold condition when the track type is a single rail. Set,
The on-vehicle device according to claim 1. The train control signal has a different carrier frequency in the adjacent track circuit,
The boundary determination means changes from a state where the reception level of the first train control signal of the first carrier frequency satisfies the threshold condition to a state where the threshold level is not satisfied, and is different from the first carrier frequency. When the reception level of the second train control signal of the carrier frequency satisfies the threshold condition, it is determined that the track circuit boundary has been passed,
The on-vehicle device according to claim 1 or 2. The train control signal includes a track ID of a track circuit in which the train control signal is transmitted,
The boundary determination means is in a state where the reception level of the first train control signal including the first track ID does not satisfy the threshold condition, and the second track is different from the first track ID. When the reception level of the second train control signal including the ID satisfies the threshold condition, it is determined that the boundary of the track circuit has been passed,
The on-vehicle device according to any one of claims 1 to 3. The setting means sets a threshold condition for the current track circuit corresponding to the running track circuit and a threshold condition for the next track circuit corresponding to the next track circuit,
The boundary determination means compares the reception level of the first train control signal with the threshold condition for the current track circuit, and compares the reception level of the second train control signal with the threshold condition for the next track circuit. To
The on-vehicle device according to claim 3 or 4. The ground which performs control which transmits the train control signal corresponding to the track circuit to the rail of the track circuit according to the track circuit on which the train carrying the on-board device according to any one of claims 1 to 5 travels. apparatus.