JP2000335414A - Monitoring device for track circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AF-track circuit monitoring device capable of constantly monitoring an AF-track circuit in order to alleviate the maintenance work and of quickly clarifying the cause at the time of an occurrence of abnormality. SOLUTION: An AF-receiver 5 extracts only a signal, which has the desired frequency necessary for its own motion, by the aid of a BPF 5a out of input signals coming from a track 1 so as to output it to a receiver monitoring terminal 6. The level of this signal is monitored by an incoming voltage monitoring circuit 6a, while the frequency of the signal is measured by a frequency measuring circuit 6b, and the result is notified to a central monitoring device 13 via a network 12. The central monitoring device 13 notifies the frequency to a transmitter monitoring terminal 7. A digital filter 7a extracts only the signal, which has the same frequency component as that notified from the central monitoring device 13, out of signals inputted from the track 1 by an AF- transmitter 4 so that the level of this signal is monitored at a transmit level monitoring circuit 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track circuit monitoring device capable of constantly monitoring the integrity of a power transmission signal in a track circuit such as an AF track circuit in which a plurality of frequency components are mixed.

[0002]

2. Description of the Related Art FIG. 2 shows a configuration of a conventional AF track circuit monitoring apparatus, wherein 1 is a track (rail), and an AF transmitter 2 is connected to one point on the track to transmit an electric signal. And
An AF trajectory circuit is configured by receiving the signal with the AF receiver 3 connected to another point in the section. Normal,
The track circuit of a railway is made up of electrically isolated sections as one circuit. In this blockage circuit, electricity is transmitted from the point in the traveling direction of the train, and the signal is used to excite the relay on the opposite side. When the train enters the track circuit, the circuit is short-circuited by the axle, so that the signal does not reach the receiving side and the excitation can be released. As a result, the approach of a train is detected, the circuit breaker at a railroad crossing is opened and closed, and a signal horn sounds. However, for example, in the case of an urban railway, if one residential area is created and one railroad crossing is added, it is difficult to redraw the rails to add one block circuit. Therefore, by using several frequencies as a high frequency signal constituting the block circuit,
Several types of track circuits that are not electrically isolated from each other can be made on rails. Since this high-frequency band is composed of several kilohertz to several tens kilohertz, such a track circuit is called an AF track circuit (AF = Audio Frequency).

In each of the AF transmitter 2 and the AF receiver 3, a measuring instrument is put in a monitoring window, and a maintenance worker periodically checks whether or not the transmission level or the reception level is within a certain width. I go to. The AF receiver 3 has a built-in BPF (bandpass filter) 3a for extracting only a desired frequency component necessary for its own operation from an input signal in which a plurality of frequency components are mixed. The above-mentioned measuring device for the maintenance personnel to check the soundness of the incoming signal is also provided at a position passing through the BPF 3a. However, in the AF transmitter 2, since the above-mentioned measuring instrument put in the monitoring window for the maintenance person of the track circuit to check the integrity of the power transmission signal is directly connected to the rail 1, the AF transmitting device 2 Are superimposed with a plurality of frequency components such as a power transmission signal in an adjacent AF track circuit and a train selection signal from a train. Therefore, when the maintenance person checks the integrity of the power transmission signal from the AF transmitter 2, it is necessary to temporarily disconnect the connection to the rail 1 and perform measurement, which is usually performed at midnight when the train is not operating. .

[0004]

SUMMARY OF THE INVENTION The above conventional A
In the F track circuit monitoring device, since the output terminal of the transmitter 2 is directly connected to the rail 1, the signal detected by the measuring device for measuring the power transmission signal from the transmitter 2 from the connection point with the rail 1 includes: Since a power transmission signal and noise from a train in the adjacent track circuit are superimposed, a measurement error is large, and it is difficult to monitor a transmission level. However, in order to clarify the cause of the failure, it is necessary to check the soundness of the transmission level. For this purpose, the transmitter 3 is temporarily separated from the rail 1 and measured at midnight when the train is not operating. Therefore, the burden of maintenance work was heavy. In order to solve the problem, the BP included in the transmitter 2
Although it is conceivable to newly incorporate the F3a, there is a problem that the number of transmitters is large and the cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide a track circuit monitoring device capable of constantly monitoring track circuits and reducing maintenance work. . A second object of the present invention is to provide a track circuit monitoring device capable of promptly investigating a cause when an abnormality occurs.

[0006]

In a track circuit monitoring apparatus according to the present invention, a frequency measuring means for measuring a frequency component of an electric signal extracted by a receiver, and a transmitting means for notifying the transmitter of the measurement result. And the transmitter includes extraction means for extracting only the signal of the notified frequency component from the input signals detected from the connection point with the track circuit.

[0007] Further, the receiver and the transmitter connected to both ends of each track circuit are connected to a network to which a central monitoring device for monitoring the operation status of the train is connected. The frequency component notified from the receiver of the track circuit via the network is notified to the transmitter of the track circuit via the network.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 2 is a configuration diagram showing an AF track circuit monitoring device according to an embodiment of the present invention. In the figure, 1 is a track (rail), 4 is A
F transmitter, transmission voltage generating circuit 4a and measuring terminal 4b
Are directly connected to the rail 1 and are built in. Reference numeral 5 denotes an AF receiver, a BPF (bandpass filter) 5a, and a measurement terminal 5.
b and a charging voltage determining circuit 5c. This B
The PF 5 a extracts only a desired frequency component necessary for its own operation from an input signal in which a plurality of frequency components are mixed, and is usually built in the AF receiver 5. Reference numeral 6 denotes a receiver monitoring terminal which receives a measurement signal from a measurement terminal 5b of the AF receiver 5, monitors a signal level of the measurement signal, and a frequency measurement circuit which measures a frequency component of the measurement signal. 6b, and network 12
And a transmission circuit 6c for performing data transmission with the central monitoring device 13 through the communication line.

Reference numeral 7 denotes a transmitter monitoring terminal, a digital filter 7a for extracting only a signal of a frequency component to be monitored from an input signal from a measurement terminal 4b of the AF transmitter 4, and a signal level of an output signal from the digital filter. And a transmission circuit 7c for performing data transmission with the central monitoring device 13 via the network 12. In the figures, 8, 9, 10, 11
Are the same as the AF transmitter 4, the AF receiver 5, the receiver monitoring terminal 6, and the transmitter monitoring terminal 7, respectively.
It is assumed that the transmission voltage is transmitted from the F transmitter 8 at a frequency different from that of the AF transmitter 4. In addition, the central monitoring device 13 performs data transmission between the receiver monitoring terminal 6 and the transmitter monitoring terminal 7, and constantly monitors the operation status such as the position of the train on the track circuit.

In the AF trajectory circuit monitoring device configured as described above, for example, in the trajectory circuit including the AF transmitter 4 and the AF receiver 5, the power transmission voltage generation circuit 4a of the AF transmitter 4 uses the frequency f1. It is assumed that the transmission voltage is transmitted, and in the track circuit constituted by the AF transmitter 8 and the AF receiver 9, the transmission voltage at the frequency f2 is transmitted from the transmission voltage generation circuit 8a of the AF transmitter 8.
That is, it is assumed that the track circuit of frequency f1 and the track circuit of frequency f2 are adjacent to each other on the same track 1. Further, it is assumed that a train selection signal based on the frequency f3 is transmitted from the train. At this time, the frequency (f1 +
f2 + f3) is input. But BP
By F5a, only f1, which is the cycle number component of the track circuit, is extracted, and only the charging voltage of f1 is output from the measurement terminal 5b to the receiver monitoring terminal 6. The signal frequency is measured by the frequency measurement circuit 6b, and the result is transmitted from the transmission circuit 6c to the central monitoring device 13 via the network 12.
Notify. The central monitoring device 13 includes the receiver monitoring terminal 6.
When the signal frequency is received from the transmission circuit 6c, the transmission circuit 7 on the side of the AF transmitter 4 which is the transmission partner of the transmission circuit 6c
c, the received signal frequency is notified.

On the other hand, since the measuring terminal 4b of the AF transmitter 4 is directly connected to the rail 1, from the connection point, in addition to the signal of the frequency f1 to be monitored, f2 and f3
Is also superimposed. Therefore, the signal on which the signals of the frequencies f2 and f3 are superimposed is also input to the transmitter monitoring terminal 7. However, as described above, the transmission circuit 7c of the transmitter monitoring terminal 7 transmits the frequency measurement circuit 6 of the receiver monitoring terminal 6 from the central monitoring device 13 via the network 12.
The frequency which is the measurement result of b can be obtained. This frequency is the frequency component f1 of the signal to be monitored. The digital filter 7a of the transmitter monitoring terminal 7 can extract only the frequency component f1 obtained from the central monitoring device 13 from the input signal on which the plurality of frequencies are superimposed. Then, the signal level is checked in the transmission level monitoring circuit 7b.

The same operation as described above is performed in the AF transmitter 8, the AF receiver 9, the receiver monitoring terminal 10, and the transmitter monitoring terminal 11. However, the frequency component to be monitored in the track circuit is f2, and the BPF
It goes without saying that the frequency component extracted at 9a and the frequency component extracted at the digital filter 11a are f2. Further, the central monitoring device 13 constantly monitors the position of the train, and when a short circuit occurs in the track circuit and there is no notification from the receiver monitoring terminals 6, 10, whether or not this is due to the train entering the track circuit. Can be determined.
That is, since the transmission levels of the transmitters 4 and 8 are checked, when the level of the incoming voltage decreases or becomes zero in the receivers 5 and 9 and the frequency cannot be notified to the central monitoring device 13, If the soundness of the transmission level is confirmed, it is understood that a short circuit has occurred in the track circuit. At that time, the central monitoring device 13 determines whether or not a train can be present on the track circuit from the continuity of the position of the train or the like. Judgment as an improper short circuit due to foreign matter such as stones allows maintenance work on the site. As described above, in an AF track circuit in which signals of a plurality of frequency components are mixed, such as a signal of a track circuit adjacent to the same track or a signal from a train, the transmitter side also monitors only the signal of the monitored frequency component. Therefore, even during the operation of the train, the soundness of the track circuit can be constantly and easily monitored, and the maintenance work can be reduced. In addition, when an abnormality such as an improper short circuit occurs, it is possible to quickly determine whether the cause is the rail, the transmitter, or the receiver. In the above description, the track circuit to be monitored is an AF track circuit in which a plurality of frequencies are mixed. However, a normal track circuit having an electrically isolated section as one circuit may be used. I don't care.

[0013]

Since the present invention is configured as described above, it has the following effects.

On the receiver side, the frequency component of the electric signal extracted as the object of monitoring the reception level is measured, and the measurement result is notified to the transmitter side. Since only the signal of the notified frequency component is monitored, efficient monitoring can be performed with an inexpensive device that does not require a special H / W. Further, even if the monitoring target frequency is changed, it can cope with an arbitrary frequency component.

Further, the frequency component measured by the receiver is notified to the central monitoring device via the network, and the central monitoring device notifies the transmitter of the frequency component. Transmission between the transmitter and the transmitter, and the cause can be quickly investigated when an abnormality occurs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an AF track circuit monitoring device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional AF track circuit monitoring device.

[Explanation of symbols]

Reference Signs List 1 track (rail), 4 AF transmitter, 4a transmission voltage generator, 4b measurement terminal, 5 AF receiver, 5a B
PF, 5b measurement terminal, c charging voltage judgment circuit, 6 receiver monitoring terminal, 6a charging voltage monitoring circuit, 6b frequency measurement circuit, 6c transmission circuit, 7 transmitter monitoring terminal,
7a digital filter as extraction means, 7b transmission level monitoring circuit, 7c transmission circuit, 12 networks, 13 central monitoring device.

Claims (2)

[Claims] 1. A transmitter connected to one end of a track circuit to transmit an electric signal to the track, and a receiver connected to the other end of the track circuit receives an electric signal from the track to receive a signal. On the side, in a track circuit monitoring device that extracts only a desired frequency component from the received electric signal and monitors the reception level, a frequency measuring unit that measures a frequency component of the electric signal extracted by the receiver; Transmission means for notifying a result to the transmitter side, and, on the transmitter side, extraction means for extracting only the signal of the notified frequency component among input signals detected from a connection point with the track circuit. A track circuit monitoring device, comprising: monitoring the extracted signal level. 2. A receiver and a transmitter connected to both ends of each track circuit are connected to a network to which a central monitoring device for monitoring the operation status of a train is connected. 2. The track circuit monitoring apparatus according to claim 1, wherein the frequency component notified from the receiver of the track circuit via the network is notified to the transmitter of the track circuit via the network.