JP4066039B2 - Track circuit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a track circuit device, and more particularly to a track circuit device capable of appropriately performing train detection.
[0002]
[Prior art]
Generally, in a track circuit device, a transmission device and a reception device are connected to both ends of each track circuit, and a signal from the transmission device is received by the reception device via the track circuit, and a train on the track circuit is determined from the reception level at that time. The presence / absence of a line is determined.
[0003]
In such a track circuit device, conventionally, gain adjustment performed periodically is performed on the condition that the reception level at the time of the adjustment is within a certain range with respect to the reception level at the previous operation. This is a method of automatically adjusting the gain, and it is common to determine whether the track circuit has fallen or climbed without changing the determination level. This method is generally called level learning.
[0004]
The transmission device and the reception device connected to the track circuit are connected to the ground control device via a network, and a signal received by the reception device is sent to the ground control device. The ground control device determines that the level of the signal received by the receiving device, that is, the reception level is equal to or higher than the specified value, determines that the track circuit is on the upper side, and if the level is equal to or lower than the specified value, determines that the track circuit is dropped. On the other hand, the level learning is performed at the time of the previous level learning operation, with the above-mentioned fixed value fixed, with the aim of eliminating inadvertent level tracking due to the train line, on the condition that the adjacent track circuit or the own track circuit is elevated. The reception level is compared with the reception level at the current level learning operation, and when the difference is within a certain range, the difference is directly reflected in the input gain.
[0005]
[Problems to be solved by the invention]
By the way, the leakage conductance in the track circuit is greatly different between when it is sunny and dry and when it is raining and leaking. For this reason, when both the gain and the judgment level are fixed, the leak fluctuation response width becomes narrow, and if the transition to the drying direction exceeds this response width, the track circuit cannot be dropped regardless of the train line, and the danger side It becomes an event. Conversely, when the track circuit transitions in the leakage direction, the track circuit continues to drop regardless of the train non-existence line, and the operation rate decreases.
[0006]
As a countermeasure against this, in the prior art, it has been common to determine whether the track circuit has fallen or climbed using the level learning method described above. In the case of this level learning method, since it is necessary to automatically adjust the input gain and the output gain, it is necessary to give the transmitting / receiving device a fail-safe function, and the mechanism of the device becomes complicated. Also, in the level learning method, the amount of change at one time is limited to a certain range, and the operable range for the case where the level learning is operated a plurality of times is not defined. When fluctuations occur, safety may not be guaranteed, and alarm output that promotes maintenance such as track circuit adjustment is not implemented.
[0007]
It is an object of the present invention to ensure safety and improve an operating rate in a track circuit device.
[0008]
[Means for solving the problems]
In order to solve the above problems, the present invention is such that a transmission device and a reception device are connected to a track circuit, a signal transmitted from the transmission device is received by the reception device via the track circuit, and the reception level is equal to or lower than the drop determination level. If the track circuit device determines that the track circuit has fallen, and if the reception level is equal to or higher than the lift-up determination level, the track circuit device determines that the track circuit has been lifted. Determination level determining means for changing the control reference value indicating the reception level in accordance with the fluctuation of the reception level received by the receiving device, and determining the fall determination level and the lifting determination level based on the changed control reference value The determination level determining means sets an upper limit value and a lower limit value of the control reference value in consideration of the type of the track circuit and the track circuit length for the steady fluctuation of the reception level, and is within the range of the upper and lower limit values. System It is characterized by changing the reference value.
[0009]
According to the above configuration, the control reference value changes following the change in the reception level, and the drop determination level and the lifting determination level also change due to the change in the control reference value. In addition, when the train is on the track, it is reliably determined that the track circuit is on the railroad, and when the train is not on the track, the track circuit is dropped. In this case, the upper limit value and the lower limit value of the control reference value are set in consideration of the type of track circuit and the track circuit length, and the control reference value changes within the range of the upper limit value and the lower limit value. Therefore, the control reference value does not deviate greatly, and both safety and operating rate can be improved.
[0010]
Note that the upper and lower limits are set within a range that does not allow the track circuit to fall, no matter what level learning decision is made from noise, etc. from the drop width and drop judgment level at the specified short-circuit sensitivity. Yes.
[0011]
Further, in the present invention, the determination level determining means sets a level rise monitoring value that is the same level as the upper limit value or higher than the upper limit value, and forces the track circuit when the reception level exceeds the level rise monitoring value. It is characterized by being dropped. The level increase monitoring value is composed of a drop width and a drop determination level at a specified short-circuit sensitivity, and is set to a reception level or less at which the track circuit cannot be dropped.
[0012]
Further, in the present invention, the determination level determining means sets the level increase alarm value to the level immediately before the upper limit value, sets the level decrease alarm value to the level immediately before the track circuit continues to fall, and the reception level is the level increase alarm value. Alternatively, an alarm is output when the level lowering alarm value is reached. The level lowering alarm value is composed of a drop width and a lifting-up determination level at a prescribed short-circuit sensitivity, and is set to be equal to or higher than a reception level at which the track circuit drops continuously.
[0013]
Further, in the present invention, the determination level determination means sets the uplift determination level at the lower limit value as the re-startup lower limit value, and the reception level is re-started when the track circuit device main body changes from the stopped state to the operating state. It is characterized in that it is determined that the track circuit is above the lower limit value, and that the track circuit is determined to be dropped if the reception level is less than the restarting lower limit value.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a system configuration of a track circuit device according to the present invention. N track circuits (1, 2,..., N) are provided in order to detect the position of the train 10 traveling on the track. Transmitting and receiving devices 11 a and 11 b that transmit and receive signals to and from the track circuit 1 are connected to both ends of the track circuit 1. Similarly, each of the track circuits (2,..., N) is connected to a transmitting / receiving device at both ends. In FIG. 1, a transmission / reception device 12a connected to one side of the track circuit 2 and a transmission / reception device 1nb connected to the other side of the track circuit n are shown.
[0015]
Inside the transmission / reception device 11a, a modulation unit 21a, a transmission unit 31a, a reception unit 41a, a demodulation unit 51a, and a reception level calculation unit 61a are provided. In addition, a modulation unit 21b, a transmission unit 31b, a reception unit 41b, a demodulation unit 51b, and a reception level calculation unit 61b are provided inside the transmission / reception device 11b. The internal configuration of the transmission / reception devices (12a,..., 1nb) is the same as that of the transmission / reception devices 11a and 11b. Each transmission / reception device (11a, 11b, 12a,..., 1nb) is connected to the ground control device 100 via the network 170.
[0016]
On the ground control device 100, the track control unit 110 that manages the train track, the up / down of the track circuit based on the reception level of the signal received by the transmission / reception devices (11a, 11b, 12a,..., 1nb). Reception level determination unit 120 for determining, presence line detection result determination unit 130 for determining the possibility of presence / absence of a train, train presence determination unit 140 for determining presence / absence of a train, determination of presence / absence of a train A signal control unit 150 that controls the train according to the result, and a display unit 160 that displays the determination result of the presence / absence of the train are provided. Also, in the standing line management unit 110, there are provided a telegram signal creation unit 111 that creates a different signal for each transmission / reception device, and a standing line detection result information storage unit 112 that stores a train presence line determination result.
[0017]
The transmitting / receiving devices (11a, 11b, 12a,..., 1nb) are used in different parts depending on whether the transmitting device or the receiving device is used. Whether to use the transmitting device or the receiving device is separately instructed from the ground control device 100 via the network 170. In the present embodiment, the transmission / reception device 11a is used as a transmission device, and the transmission / reception device 11b is used as a reception device. That is, in the transmission / reception device 11a, a modulation unit 21a that performs MSK modulation (Minimum Shift Keying) on a signal and a transmission unit 31a that transmits a signal to the track circuit 1 are used. Further, in the transmission / reception device 11b, a reception unit 41b that receives a signal from the track circuit 1, a demodulation unit 51b that demodulates a signal received from the track circuit 1, and a reception level that calculates a reception level of the signal received from the track circuit 1 The calculation unit 61b is used.
[0018]
Next, the train presence line detection process in the track circuit device having the above configuration will be described with reference to FIGS. 2 and 3.
The ground control device 100 creates a signal Sds by the telegram signal creation unit 111 of the standing line management unit 110 in order to perform the train presence line detection process. The created signal Sds is transmitted to the transmission / reception device 11a via the network 170.
[0019]
The transmission / reception device 11a modulates the signal Sds received from the ground control device 100 with a predetermined frequency by the modulation unit 21a, and transmits the modulated signal Sa to the track circuit 1 from the transmission unit 31a. The transmission / reception device 11a and the transmission / reception device 11b are connected by the track circuit 1, and the signal Sa is transmitted to the transmission / reception device 11b via the track circuit 1 by track circuit transmission. The transmission / reception device 11b receives the signal Sa from the track circuit 1 by the receiving unit 41b, demodulates the signal Sa by the demodulation unit 51b, and calculates the reception level of the received telegram signal Sa by the reception level calculation unit 61b. Further, the transmission / reception device 11b transmits the demodulated signal Sdr and the reception level to the ground control device 100 via the network 170.
[0020]
The ground control device 100 receives the signal Sdr and the reception level from the transmission / reception device 11b, and the reception level determination unit 120 determines whether the reception level is lower than the fall determination level or higher than the lifting determination level. The fall determination level and the lifting determination level are determined based on the control level determined during the track circuit adjustment. The control level is equivalent to the reception level when there is no line at that time.
[0021]
FIG. 3 shows a temporal change in the reception level when the train is on-line or not. When a train is present in the track circuit, the track is short-circuited by the train axle, so that when the signal transmitted from the transmission / reception device 11a to the track circuit 1 is received by the transmission / reception device 11b, the reception level decreases and a drop determination is made. Below level. When the train is not present, the reception level at the transmission / reception device 11b does not decrease and becomes higher than the lifting determination level. FIG. 3 shows an example in which the drop determination level is set 10 dB below and the uplift determination level 7 dB below the control level (control reference value). As described above, the fall determination level and the lifting determination level are determined from the control level, and a method for determining the control level is level learning.
[0022]
Next, level learning will be described with reference to FIGS. As shown in FIG. 4, in the level learning, the level from one learning timing to the next learning timing is determined on the condition that when the trajectory circuit is uplifted, the adjacent trajectory circuit is also uplifted in some cases. At the learning interval, the track circuit fall / lift determination is performed with the maximum value A of the reception level within the specified range with respect to the previous control level as the next new control level. The maximum value A is a maximum value within a predetermined range (+2 dB to −2 dB).
[0023]
The level learning width is determined from the reception level drop width, drop determination level, and uplift determination level at the specified short-circuit sensitivity. In FIG. 5, -8 from the level learning initial value is set as the level learning lower limit value, and +5 is set as the level learning upper limit value. The lower limit of the level learning is a value that does not result in a determination on the track circuit in spite of the train line when the track circuit has made a dry transition within the precondition range after the level learning in the downward direction until the next level learning. To do. In addition, the level learning upper limit is an absolute condition that the reception level at the specified short-circuit sensitivity at the level learning upper limit does not fall on the track circuit when it is judged to fall or climb on the basis of the level lower limit. If the track circuit is in a leak transition within the precondition after the upward level learning and before the next level learning, a value that does not cause the track circuit to fall despite the absence of the train is taken into account as necessary. The range is specified with. Note that the level learning upper limit value and the level learning lower limit value are determined in consideration of the type of track circuit (insulation presence / absence, presence / absence of a switch, level of leakage conductance and signal frequency) and track circuit length.
[0024]
In the initial value, the upper limit value, and the lower limit value of the level learning, the steady level is equal to the control level, -7 from the steady level to the lifting judgment level, -10 from the steady level to the fall judgment level, and -23 to the standing line level. Is set.
[0025]
FIG. 6 is an example in which the level rise monitoring value is set. The level rise monitoring value assumes that there is a dry transition that exceeds the preconditions or that there is a short circuit failure of the device. Therefore, a reception level that may be determined as a non-existing line regardless of a train existing line is defined as level rise monitoring. And when the reception level more than a level rise monitoring value is detected, a track circuit is forcibly dropped. In FIG. 6, the level increase monitoring value is set to +5, which is the same as the level learning upper limit value, but may be set to a level (for example, +6) higher than the level learning upper limit value.
[0026]
FIG. 7 shows an example in which a level increase alarm value and a level decrease alarm value are set. In FIG. 7, the level increase alarm value is set to +4, and the level decrease alarm value is set to -14. The level increase warning value is for issuing an alarm before the level increase monitoring value is reached and urging maintenance. Also, the level lowering alarm value assumes that there is a leakage transition that exceeds the precondition, and from the received level drop width and level learning lower limit drop judgment level at the specified short-circuit sensitivity, before the track circuit continues falling Raise alarm and encourage maintenance.
[0027]
When there is a leakage transition and the steady level gradually decreases and the steady level becomes -15 as shown in the right end of FIG. 7, the track circuit continues to fall, making it impossible to lift the track circuit. However, if the level lowering alarm value is set as described above, such a situation can be avoided in advance.
[0028]
FIG. 8 shows an example in which the re-startup lower limit value is set. In FIG. 8, the re-startup lower limit value is set to −15. The re-startup lower limit value is used to determine the control level when the system is started up from the stop, and the uplift determination level in the level learning lower limit value is set as the re-startup lower limit value.
[0029]
【The invention's effect】
As described above, according to the present invention, it is possible to increase the tracking width of the leakage fluctuation of the track circuit, and the control reference value changes within the range of the upper and lower limit values. A track circuit device capable of improving the rate can be realized.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a track circuit device according to the present invention.
FIG. 2 is an explanatory diagram of train detection processing by the track circuit device shown in FIG. 1;
FIG. 3 is a diagram showing a temporal change in reception level when a train is present or not.
FIG. 4 is a diagram showing a data reflection range in level learning.
FIG. 5 is a diagram illustrating a calculation basis of a control level range in level learning.
FIG. 6 is a diagram illustrating an example in which a level increase monitoring value is set.
FIG. 7 is a diagram illustrating an example in which a level increase alarm value and a level decrease alarm value are set.
FIG. 8 is a diagram showing an example in which a re-startup lower limit value is set.
[Explanation of symbols]
1 to n Track circuit 10 Train 11a to 1nb Transceiver 21a, 21b Modulator 31a, 31b Transmitter 41a, 41b Receiver 51a, 51b Demodulator 61a, 61b Receive level calculator 100 Ground controller 110 On-line manager 111 Telegram signal Creation unit 112 Standing line detection result information storage unit 120 Reception level determination unit 130 Standing line detection result determination unit 140 Train presence line determination unit 150 Signal control unit 160 Display unit 170 Network

Claims (4)

A transmission device and a reception device are connected to the track circuit, and a signal transmitted from the transmission device is received by the reception device via the track circuit. In the track circuit device for determining, if the reception level is higher than the lift determination level, the track circuit apparatus determines that the track circuit is lifted,
Based on the changed control reference value, an initial value is set at the time of track circuit adjustment and the control reference value indicating the reception level when the train is not present is changed following the change in the reception level received by the receiver. Determination level determination means for determining the fall determination level and the lifting determination level, the determination level determination means taking into account the type of track circuit and track circuit length with respect to the steady fluctuation of the reception level. An upper limit value and a lower limit value for the control reference value are set, and the control reference value is changed within the range of the upper and lower limit values. The track circuit device according to claim 1,
The determination level determining means sets a level rise monitoring value that is the same level as the upper limit value or higher than the upper limit value, and forcibly causes the track circuit when the reception level becomes equal to or higher than the level rise monitoring value. A track circuit device characterized by being dropped. The track circuit device according to claim 1,
The determination level determining means sets a level increase alarm value at a level immediately before the upper limit value, a level decrease alarm value at a level immediately before the track circuit continues to fall, and a reception level is the level increase alarm value or the level. An orbital circuit device that outputs an alarm when a lowering alarm value is reached. The track circuit device according to claim 1,
The determination level determination means sets the uplift determination level at the lower limit value as a re-startup lower limit value, and when the track circuit device main body changes from a stopped state to an operating state, the reception level is equal to or higher than the re-startup lower limit value. The track circuit device is characterized in that it is determined that the track circuit is in the upper position, and that the track circuit is determined to be dropped if the reception level is less than the re-startup lower limit value.

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