JP4113646B2 - Train detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a train detection device, and more particularly to a train detection device that can detect rail breakdown detection using a train detection signal.
[0002]
[Prior art]
Conventionally, a train detection device using a track circuit is configured to apply a predetermined signal for train detection to the start end side of a rail forming one track circuit and receive the signal from the end side of the rail. Yes. When a predetermined signal is received from the terminal end of the rail, the absence of a train is detected on the track circuit. When the predetermined signal cannot be received, the presence of a train is detected on the track circuit. I try to detect it.
[0003]
Moreover, the train detection device using this track circuit separates the frequencies of signals used in the adjacent track circuits because the train detection cannot be performed if the train detection signal of the adjacent track circuit leaks out. However, in this case, since the state of insulation is not known, that is, it is interposed between the rail for forming one track circuit and the rail for forming another track circuit adjacent to the one track circuit. Since the state of the insulator is not known, a rail breakdown detection device for monitoring this is provided as a separate device outside the train detection device.
[0004]
As an example of the rail breakdown detection device, a signal current flowing through an impedance bond coil for connecting between rails forming adjacent track circuits like a train power source is extracted via a current transformer (CT), There is a detection device that monitors an insulation state of an insulator based on an extracted signal.
[0005]
[Problems to be solved by the invention]
However, the conventional train detection device does not have a function of monitoring the state of the insulator interposed in the rail. Therefore, the rail breakdown detection device must be provided outside the train detection device, and the equipment cost is high. There was a bulky drawback.
[0006]
Accordingly, the present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide a train detection device capable of monitoring the state of rail insulation using a track circuit transmission / reception device. There is to do.
[0007]
[Means for Solving the Problems]
This onset Ming, in order to achieve the above object, to divide the rail at a predetermined interval length by an insulator, and connected on both sides to the impedance bond of each insulator, constituting a track circuit corresponding to each segment Then , a transmitter is connected to one end of each track circuit , a receiver is connected to the other end, a train detection signal is sent from the transmitter, and whether or not the receiver receives the train detection signal. In the train detection device for detecting whether or not a train exists in the section , (a) the transmitter identifies the track circuit generated by MSK modulating a carrier wave having a frequency common to all transmitters. A digital signal including data is transmitted as a signal for train detection, (b) the receiver is (b1) a bandpass filter that filters a signal received from the track circuit via the impedance bond; b2) a level determination circuit for detecting the output level of the bandpass filter; (b3) a message decryption circuit for extracting identification data from the output of the bandpass filter; and (b4) a level detected by the level determination circuit is predetermined. As described above, when the message decryption circuit extracts the identification data of the track circuit, it is determined that there is no train, the level detected by the level determination circuit is equal to or higher than the predetermined level, and the message decryption circuit identifies other track circuits. When data is extracted or when the data extracted by the message decryption circuit is abnormal, it is determined that there is a train, the level detected by the level detection circuit is less than a predetermined value, and the message decryption circuit does not extract identification data. A reception determination circuit that determines that there is a train; and (b5) the level detected by the level determination circuit is equal to or greater than a predetermined level, and the message decryption circuit When the identification data of the circuit is extracted, it is determined that the insulator of the track circuit is normal, the level detected by the level determination circuit is equal to or higher than a predetermined level, and the message decryption circuit detects the identification data of another track circuit. Or when the data extracted by the message decryption circuit is abnormal, it is determined that the insulator of the track circuit is abnormal, the level detected by the level determination circuit is less than a predetermined value, and the message When the decoding circuit does not extract the identification data, it has an insulation determination circuit that determines that the insulator of the track circuit is normal .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a schematic configuration diagram of a train detection device according to an embodiment, as a train detection device for a track circuit BT sandwiched between a track circuit AT located on the left side and a track circuit CT located on the right side. It is shown. The track circuit AT and the track circuit CT are provided with the same train detection device, but are omitted here. Therefore, the following description will focus on the track circuit BT.
[0009]
The track circuit BT is formed by dividing the rail r on which the train travels by an insulator ( short line intersecting the rail r in FIG. 1A). Further, the left side of the track circuit BT is connected to the track circuit AT via the impedance bond T1 as a train power source, and the right side thereof is connected to the track circuit CT via the impedance bond T2 as a train power source.
[0010]
In FIG. 1A, reference numeral 1 denotes a track circuit transmitter / receiver composed of a transmitter 1a and a receiver 1b, in which the rail breakdown detection function according to the present invention is incorporated in the receiver 1b.
[0011]
The transmitter 1a MSK-modulates a carrier wave having a predetermined frequency with the track circuit information (Sb) represented by a digital value including a predetermined identification number for specifying the track circuit BT, and thereby a digital signal , that is, identification data (DSb). The identification data (DSb) can be transmitted via the secondary winding t of the impedance bond T2.
[0012]
Note that in the transmitter for the track circuit AT (not shown), the track circuit information for specifying the track circuit AT is MSK-modulated with the track signal having the same frequency as described above to generate predetermined identification data (DSa). In the transmitter for the track circuit CT (not shown), the carrier wave having the same frequency as described above is MSK-modulated with track circuit information for specifying the circuit CT, and a predetermined frequency is transmitted. A digital signal (DSc) is generated and transmitted to the track circuit CT.
[0013]
Receiver unit 1b, as shown in FIG. 1 (b), Band pass filter (BPF) 10, a demodulation circuit 11, message decryption circuit 12, a reception determination circuit 13, the level judging circuit 14 and the insulating determination circuit 15 has, after the filtering with the signal received through the secondary winding t a (DSb) Band-pass filter (BPF) 10 of the impedance bond T1, the track circuit BT and demodulation processing by the demodulation circuit 11 identify The identification data to be extracted can be extracted.
[0014]
Electrostatic statement decode circuit 12 is extracted by decrypting the data inputted from the demodulation circuit 11, also receiving the determination circuit 13, the track circuit BT from the determined levels by the level determining circuit 14 to be described later and its extracted data It is comprised so that it can be judged whether a train is present or not.
[0015]
Level decision circuit 14, so that the output level of the band-pass filter 10 be configured so as to determine whether or not a predetermined or higher, and inputs the determination output to the reception judgment circuit 13 and the insulating determining circuit 15 described above It is configured. The insulation judgment circuit 15 is configured to determine the insulation state of the insulator by using the data input from the level determining circuit 14 level above message decryption circuit 12 obtained from.
[0016]
Hereinafter, the control operation of train position detection and insulation detection will be described using the determination table of FIG.
[0017]
Now, when the train is not present in the track circuit BT, the signal transmitted from the transmitter 1a should be received by the receiver 1b. Therefore, information (DSb) (the own track ID in FIG. 1C) for identifying the track circuit BT is extracted from the received signal by the message decryption circuit 12, and the level of the signal received by the level determination circuit 14 is extracted. Is equal to or greater than the predetermined value, the reception determination circuit 13 detects that there is no train on the track circuit BT. At this time, the insulation determination circuit 15 determines that the performance of the insulator necessary for forming the track circuit BT is normal (see (a) in FIG. 1C).
[0018]
However, when the level determination circuit 14 detects a level equal to or higher than a predetermined level and the information specifying the track circuit extracted by the message decryption circuit 12 is, for example, information (DSa) of the adjacent track circuit AT. Means that the insulator is destroyed and the signal of the track circuit AT leaks to the track circuit BT. In this case, the insulation determination circuit 15 indicates that the insulation breakdown has occurred. The data is output to a maintenance management device such as a management center (not shown) (see (b) in FIG. 1). Further, in this case, the reception determination circuit 13 outputs the presence of a train to a predetermined signal security device such as an automatic train control device or an interlock device that is not shown for fail-safe purposes.
[0019]
Also, in the case of a broken electronic message (information) in which the level determination circuit 14 detects a level higher than a predetermined level and the information specifying the track circuit extracted by the message decoding circuit 12 cannot specify which track circuit Means that the level of the adjacent signal leaking is small because the insulator is broken. In this case, the insulation determination circuit 15 indicates that the dielectric breakdown has occurred. (Refer to C in FIG. 1C). In this case, the reception determination circuit 13 outputs the presence of a train to the signal security device in order to achieve failsafe.
[0020]
When a train is present on the track circuit BT, the rail r is short-circuited on the train axle, so that the receiver 1b is in a no-signal state. That is, the level detected by the level determination circuit 14 is “0”, and therefore the information (DSb) cannot be extracted in the message decryption circuit 12. The reception determination circuit 13 detects the presence of a train on the track circuit BT when there is no information (DSb). At this time, the insulation determination circuit 15 determines that the insulator is normal (see d in FIG. 1C).
[0021]
【The invention's effect】
By the present invention Repa, (a) the transmitter sends a digital signal including identification data for identifying the track circuit generated by MSK modulation of a carrier wave of common frequency to all transmitter as train detection signal (B) a receiver is (b1) a bandpass filter that filters a signal received from the track circuit via the impedance bond; and (b2) a level that detects an output level of the bandpass filter. A determination circuit; (b3) a message decryption circuit that extracts identification data from the output of the bandpass filter; and (b4) a level detected by the level determination circuit is greater than or equal to a predetermined level, and the message decryption circuit identifies the track circuit. When data is extracted, it is determined that there is no train, the level detected by the level determination circuit is equal to or higher than a predetermined level, and the message decryption circuit recognizes other track circuits. When another data is extracted or when the data extracted by the message decryption circuit is abnormal, it is determined that there is a train, the level detected by the level detection circuit is less than a predetermined value, and the message decryption circuit extracts the identification data. If not, a reception determination circuit that determines that there is a train; and (b5) if the level detected by the level determination circuit is equal to or higher than a predetermined level, and the message decryption circuit extracts the identification data of the track circuit, the track circuit It is determined that the insulator is normal, the level detected by the level determination circuit is equal to or higher than a predetermined value, and the message decoding circuit extracts identification data of another track circuit, or the message decoding circuit extracts When the data is abnormal, it is determined that the insulator of the track circuit is abnormal, the level detected by the level determination circuit is less than a predetermined level, and the message decoding circuit detects the identification data. When not extracted, because it has a said determining insulation judgment insulator is normal circuit of the track circuit, by using the train detection signal used in track circuits, even the destruction of the insulator than the train detection Can be detected.
[Brief description of the drawings]
1A is a schematic configuration diagram of a detection device according to an embodiment of the present invention, FIG. 1B is a detailed diagram of a receiver, and FIG. 1C is a determination table.
[Explanation of symbols]
r rail AT, BT, CT track circuits T1, T2 impedance bond 1 orbital circuit transceiver 1a transmitter 1b receiver 10 band-pass filter (BPF)
DESCRIPTION OF SYMBOLS 11 Demodulation circuit 12 Message decoding circuit 13 Reception determination circuit 14 Level determination circuit 15 Insulation determination circuit

Claims (1)

Is divided into a predetermined interval length of rail by an insulator, and connected on both sides to the impedance bond of each insulator, constitutes a track circuit corresponding to each section, a transmitter at one end of each track circuit, other A receiver is connected to each end, a train detection signal is sent from the transmitter, and whether or not a train exists in the section is detected by whether or not the receiver receives the train detection signal. In the train detector ,
The transmitter transmits a digital signal including identification data for identifying the track circuit generated by MSK modulation of a carrier wave having a frequency common to all transmitters as a train detection signal.
The receiver discriminates from a bandpass filter that filters a signal received from the track circuit through the impedance bond, a level determination circuit that detects an output level of the bandpass filter, and an output of the bandpass filter When the level detected by the message decryption circuit for extracting data and the level detection circuit is not less than a predetermined level, and the message decryption circuit extracts the identification data of the track circuit, it is determined that there is no train, and the level determination circuit When the detected level is not less than a predetermined value and the message decryption circuit extracts identification data of another track circuit, or when the data extracted by the message decryption circuit is abnormal, it is determined that there is a train, and the level determination circuit If the detected level is less than the predetermined level and the message decryption circuit does not extract the identification data, the reception judgment is made to determine that there is a train. When the level detected by the circuit and the level determination circuit is equal to or greater than a predetermined level and the message decryption circuit extracts the identification data of the track circuit, it is determined that the insulator of the track circuit is normal, and the level When the level detected by the determination circuit is equal to or higher than the predetermined value and the message decryption circuit extracts identification data of another track circuit, or when the data extracted by the message decryption circuit is abnormal, the insulator of the track circuit If the level detected by the level determination circuit is less than a predetermined level and the message decryption circuit does not extract identification data, the insulation determination determines that the insulator of the track circuit is normal. Having a circuit,
A train detection device characterized by that.

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