JP2015140063A - Atc signal transmitter and atc signal system including same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure that an ATC signal can be received via one loop coil even if at least one on-vehicle antenna stops near the boundary between adjacent loop coils.SOLUTION: An ATC signal transmitter 2 is disposed for every loop coil (1T to 3T) installed on a rail track, and transmits an ATC signal to a vehicle 7 running on the rail track via each loop coil. Each of on-vehicle receivers 4 each receiving the ATC signal includes signal-output adjustment means adjusting an output level of the ATC signal at a time of transmitting the ATC signal on the basis of a detection signal indicating that an on-vehicle antenna 6a or 6 stops near a boundary between the loop coils, the signal-output adjustment means generating a significant difference between the output level of the ATC signal transmitted via one of the adjacent loop coils and the output level of the ATC signal transmitted via the other loop coil so as to discriminate only one of the ATC signals as the ATC signal.

Description

  The present invention relates to a loop type ATC signal transmitter used for ATC control of a train and an ATC signal system having the loop type ATC signal transmitter.

FIG. 1 shows that a vehicle control signal (ATC signal) transmitted from a transmitter 2 installed on the ground is normally received by an on-vehicle transmitter / receiver 5 on a loop coil 1 installed for each fixed track section. It shows the state.
At this time, the on-vehicle transceiver 5 receives the ATC signal via the on-board antenna 6 installed in the vehicle 7. When the transmitter 2 transmits an ATC signal to the loop coil 1 via the matching transformer 3, a magnetic field is generated around the loop coil 1. A signal is induced in the vehicle antenna 6 by this magnetic field, and an ATC signal is transmitted to the vehicle transceiver 5. In this example, the on-board antenna 6 uses four antennas 6a to 6d, and the antenna signals are connected so as to strengthen each other. In the figure, reference numeral 4 denotes a receiver, which is connected to the transmitter 2 on the other end side of each loop coil.

  However, as shown in FIG. 2, when a stop signal is transmitted to the train and the vehicle antenna 6 stops near the boundary between the adjacent loop coils 1a and 1b, that is, as shown in the drawing, the vehicle antenna 6a, When the set of 6b and the on-board antennas 6c and 6d are stopped at positions that span the loop coils 1a and 1b, the signals of the loop coils 1a and 1b are respectively induced on the on-board antennas of the sets, An ATC signal is superimposed.

  As shown in FIG. 3, when the on-vehicle transceiver 5 receives a signal in which the ATC signal output to the adjacent loop coils 1a and 1b is superimposed, the adjacent loop coils 1a and 1b are insulated from each other. If the carrier frequency of the ATC signal is the same as employed in the insulation type loop coil, the signals cannot be demodulated because there is a noise between them if there is no difference between the two reception levels. Alternatively, even if the carrier frequency of the ATC signal is a signal having a different frequency as employed in a non-insulated track circuit in which adjacent loop coils 1a and 1b are not insulated, all on-board antennas 6a are used. The same signal is not received at ~ 6d. For this reason, a situation in which a sufficient reception level cannot be obtained for any signal may occur. If any of the ATC signals output to the loop coils 1a and 1b cannot be demodulated, the vehicle 7 using the ATC signal cannot be operated from the viewpoint of ensuring safety. In particular, in the case of unmanned operation, there may be a situation where it is impossible to resume operation by automatic operation.

  In order to avoid such a situation, the abstract of the following Patent Document 1 states that “two or more antennas are installed forward and backward with respect to the traveling direction of the train, and there is a difference in the signal level received by each antenna. By configuring, the train stops so that the twist point of the loop coil is located between the antennas installed in the front and rear with respect to the traveling direction of the train, and the signal received by the front antenna and the rear Even if the signal received by the antenna is reversed in phase and cancelled, a signal having a high reception level remains without being canceled, and a predetermined transmission / reception level can be obtained. "

JP 2011-131661 A

  However, according to Patent Document 1, since the level difference between signals received by the respective antennas is determined in advance, for example, when the ratio of the reception sensitivity of the front and rear antennas is 1: 2, the front and rear antennas At a point where the ratio of the ATC signal magnetic field strength in the vicinity is in the vicinity of 2: 1, the reception levels of the first antenna and the second antenna are approximated. For this reason, there is a problem that the ATC signal cannot be prevented from being demodulated and the possibility that the operation cannot be resumed cannot be excluded. Therefore, an object of the present invention is to ensure that an ATC signal can be received via one loop coil even when at least one on-board antenna stops near an adjacent loop coil boundary.

  In order to solve the above-described problems, an ATC signal transmitter according to the present invention is provided for each loop coil installed on a track, and transmits an ATC signal to a vehicle traveling on the track via the loop coil. A signal output adjusting means for adjusting an output level when transmitting the ATC signal based on a detection signal indicating that the on-vehicle receiver that receives the ATC signal has stopped near the boundary between the loop coils. A significant difference between the output level of the ATC signal transmitted via one of the adjacent loop coils across the boundary and the output level of the ATC signal transmitted via the other. Only one of them is discriminated as an ATC signal.

  According to the present invention, even when the vehicle stops with the on-board antenna positioned near the boundary between the loop coils, the on-board device receives the ATC signal of one of the loop coils at a sufficient level. And the other can be eliminated as noise. This prevents a situation in which ATC signal demodulation is impossible due to increased noise or a decrease in reception level, and enables stable transmission and reception of ATC signals between on-vehicle transceivers. It is possible to reliably avoid such a situation and to operate the vehicle stably.

FIG. 1 is an explanatory diagram showing a normal communication state. FIG. 2 is an explanatory diagram when the on-board antenna stops on the boundary between adjacent loop coils. FIG. 3 is an explanatory diagram when a signal is induced from the adjacent loop coil to the on-board antenna. FIG. 4 is a diagram illustrating the configuration of the first embodiment of the present invention. FIG. 5 is a flowchart for determining on-vehicle antenna stop detection and output of an ATC signal in the first embodiment of the present invention. FIG. 6 is a diagram showing the configuration of the second embodiment of the present invention.

  Hereinafter, examples will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about what is common in a prior art.

[Example 1]
FIG. 4 shows an embodiment using the present invention and its configuration. The on-board device transmits a train detection signal (TD signal) to the receiver 4 installed on the ground via the on-board antennas 6 and 6a as on-vehicle receivers. The ground control device 8 determines the presence of the vehicle 7 using the TD signal received by the receiver 4. In this embodiment, on-board antennas 6 and 6 a are attached to both ends of the vehicle 7 in order to detect entry and advance of the vehicle 7 to a specific loop coil. The on-board antennas 6 and 6a at both ends transmit TD signals having different frequencies.

FIG. 4 shows a state in which the vehicle 7 is stopped at a position where the vehicle antenna 6 on the rear side in the traveling direction is on the loop coil 3T and the vehicle antenna 6a on the traveling direction side is near the boundary between the loop coils 2T and 3T. Is shown. In this state, since the transmitter 2 installed on the ground transmits the ATC signal to the on-board device via the loop coils 2T and 3T, the ATC signal from the loop coil 3T is normally transmitted with respect to the on-board antenna 6. Can be received.
However, the on-board antenna 6a on the traveling direction side receives the ATC signals of the loop coils 2T and 3T at the same time, and when there is no level difference between these signal levels, neither signal can be demodulated. 7 cannot be controlled.

  When this state is viewed from the ground control device 8 side, the state in which the two ground receivers 4 of the loop coils 2T and 3T are receiving the TD signal from the on-board antenna 6a continues. As described above, since the ground receivers 4 of the adjacent two loop coils 2T and 3T receive the TD signal from the on-board antenna 6a for a specified time or more, the ground control device 8 has the on-board antenna 6a. Can be determined to be stopped on the boundary between the loop coils 2T and 3T.

  The transmitters 2 of the loop coils 3T and 2T are each provided with signal output adjusting means for adjusting the output level of the ATC signal based on the determination result. In this embodiment, the transmitter 2 on the loop coil 3T side is provided. Stops the ATC signal output, and the transmitter 2 of the loop coil 2T performs control to maintain or increase the ATC signal output. As a result, the on-board antenna 6a can receive only the ATC signal of the loop coil 2T at a sufficient level, and can demodulate it.

FIG. 5 shows a flow chart until the on-board antenna stop detection on the boundary based on the TD signal and the output of the ATC signal are determined according to the present embodiment.
Every predetermined time, the processing in step S ₀ is started, in step S _1, the state outputs of the normal level of the ATC signal, state TD signals received from the adjacent two loop coils is defined level or higher It is determined whether or not this state continues for a specified time. In the case of Yes, the ground controller 8, the onboard antenna 6 to a stop on the loop coil boundary adjacent, it is determined that the signal can no longer be demodulated in the case of No, the process ends at S _5, processing in step S ₀ again waiting to be activated.

When it is determined Yes in step S _1, the ground controller 8, in step S _2, stopping the ATC signal of the loop coils 3T disposed in the traveling direction of the rear side, it is installed in the vehicle traveling direction Command to increase ATC signal output of loop coil 2T.

After that, when the train is permitted to travel by the ATC signal having a relatively increased output level, the TD reception level from one of the TD signals from the adjacent loop coils 2T and 3T is defined as the train travels. The TD reception level from the other is higher than the specified level. Ground controller 8, based on these changes in TD reception level, it is determined that the vehicle 7 is advanced from the boundary of the loop coils, to return both loop coils 2T in step S _4, the ATC signal output for 3T to normal levels The command is to be performed. After the processing in step S _4, the process ends at S _5, waits for processing is started in step S ₀ again.

As described above, it is not necessary to stop the ATC signal of the other loop coil. In short, until the advance from the boundary between adjacent loop coils can be confirmed, the output level of the ATC signal of the other loop coil If a significant difference is generated to the extent that only the ATC signal of one loop coil can be identified, the ATC signal can be demodulated normally. Therefore, in step S _2, increase only one output, or the like to reduce the only other output to a predetermined level, it is possible to adopt various aspects as the output adjustment means of the transmitter 2.
However, if priority is given to the ATC signal on the traveling direction side from the viewpoint of ensuring safety, the ATC signal of the loop coil 3T installed on the rear side in the traveling direction is stopped in step S2, as shown in FIG. It is preferable to give a command to increase the ATC signal output of the loop coil 2T installed on the vehicle traveling direction side.

In the above embodiment, the ground control device 8 detects that the on-board antenna 6a stops at the boundary region between adjacent loop coils, but stops at the boundary region between the loop coils. May be transmitted from the on-vehicle device side.
That is, when the on-board device determines that the ATC signal cannot be demodulated because the on-board antenna 6a is stopped on the boundary between the adjacent loop coils 2T and 3T, the on-board device is “stopped on the blocking boundary” by the TD signal. Information is transmitted to the ground control device 8. The ground control device 8 receives this “stop on blockage boundary” information from the on-board device. When it is determined that the antenna 6a has stopped on the boundary for a predetermined time or longer, the ATC signal of the loop coil 3T on the rear side in the traveling direction is stopped in each transmitter 2 based on a command from the ground control device 8. Then, control is performed to increase the ATC signal output of the blocking 2T on the vehicle traveling direction side.
It should be noted that the “stop on blockage boundary” information is directly transmitted to the transmitters 2 arranged in the adjacent loop coils 2T and 3T, and the output adjusting means described above is operated in each transmitter 2. Good.

When the on-board device can demodulate the ATC signal, the transmission of the “ATC signal on non-blocking boundary cannot be demodulated” information is stopped. When the on-board device normally demodulates the ATC signal and determines that the on-board antenna 6a has advanced the boundary between the loop coils, the ground control device 8 returns the ATC signal output to the normal level.
In addition, as a means for the on-board device to transmit the “stop on closed block boundary on stop” information to the ground control device 8, a communication unit other than the TD signal may be used. In addition, in the determination of “ATC signal on blocked boundary cannot be demodulated” by the on-board device, in addition to the above-described ATC reception status, the position information by the GPS receiver or the speed generator mounted on the vehicle 7 is used to determine the antenna. 6 may be detected to stop at a boundary region between adjacent loop coils.

[Example 2]
FIG. 6 shows a second embodiment using the present invention and its configuration. As in the first embodiment, the ground transmitter 2 transmits an ATC signal to the on-board device via the loop coil 1, and the on-board antenna 6a on the traveling direction side receives the ATC signal.
A sensor 9 using infrared rays, laser light, or the like, which detects the position of the on-board antenna 6a is attached in the vicinity of the closing boundary. If it is determined from the information from the sensor 9 that the on-board antenna 6a has stopped on the boundary between adjacent loop coils for a specified time or more, the ground control device 8 sends the ATC signal of the blocked 3T on the rear side in the traveling direction. A command to stop and increase the ATC signal output of the block 2T on the vehicle traveling direction side is issued.
When the sensor 9 detects that the on-board antenna 6a has advanced from the boundary, the ground control device 8 issues a command to return the ATC signal output to the normal level.

  Instead of the sensor 9 that directly detects the position of the on-board antenna 6, a sensor that detects the position of other vehicle parts, a transponder ground element for communicating with a transponder upper element attached to the vehicle 6, or a camera image The position of the on-board antenna 6 may be calculated from image processing or the like.

In addition, this invention is not limited to an above-described Example, Various modifications are included. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. For example, in each embodiment, a vehicle having two sets of antennas on the front and rear sides is assumed. However, the present invention can be applied to a vehicle having only one set of antennas.
Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Loop coil 2 Transmitter 3 Matching transformer 4 Receiver 5 On-board transmitter / receiver 6 On-board antenna 7 Vehicle 8 Ground control device 9 Sensor

Claims (3)

An ATC signal transmitter that is provided for each loop coil or track circuit installed on a track and transmits an ATC signal to a vehicle traveling on the track via the loop coil or track circuit,
Signal output adjustment means for adjusting an output level when transmitting the ATC signal based on a detection signal indicating that the on-vehicle receiver that receives the ATC signal has stopped near the boundary between the loop coil or the track circuit. Prepared,
There is a significant difference between the output level of the ATC signal transmitted via one of the loop coils or track circuits adjacent to each other across the boundary and the output level of the ATC signal transmitted via the other. An ATC signal transmitter characterized in that one of them is discriminated as an ATC signal. The ATC signal transmitter according to claim 1,
Of the adjacent loop coils or track circuits, the output level of the ATC signal output via the loop coil or track circuit on the vehicle traveling direction side is maintained or increased, and the loop coil or track circuit on the rear side in the vehicle traveling direction is maintained. An ATC signal transmitter characterized by lowering the output level of the ATC signal output via the ATC. A signal system comprising the ATC signal transmitter according to claim 1 or 2,
Detecting means for detecting that the on-vehicle receiver has stopped near the boundary between the loop coil or track circuit;
Based on the detection signal of the detection means, a command to maintain or increase the output level of the ATC signal to one of the ATC signal transmitters arranged in an adjacent loop coil or track circuit across the boundary, On the other hand, an ATC signal system comprising command means for giving a command to lower the output level of the ATC signal.

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