JP2002274376A - Train detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain high detecting accuracy and increase the cost performance of a train detector in a rail circuit using an audible frequency band by a simple method without complicating a circuit configuration. SOLUTION: A rail circuit for max. 60 districts is collectively controlled by one CPU 11 and six AMPs 121 to 126. A series resistance is connected to the output stages of the AMPs 121 to 126. In the train detector 100 in the audible frequency rail circuit having the configuration as above, six train detection signals of different frequencies f1 to f6 are continuously transmitted from the AMP 121 to 126 parallel with each other and, based on the train detection signals, detection processing for a train can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train detection device in a track circuit using an audible frequency band.

[0002]

2. Description of the Related Art In recent years, as a track circuit of a railway, an audio track circuit using an audio frequency band has been widely used instead of a commercial frequency track circuit using a commercial frequency band for the following reasons. I have.

[0003] That is, the commercial frequency track circuit has a lower short-circuit sensitivity than the audio frequency track circuit, consumes more power, makes it difficult to achieve uninterrupted power, and is necessary for stable detection of trains. Note that skill is required to adjust the orbit voltage level and the phase difference between the local voltage and the orbit voltage,
Poor maintainability. Furthermore, in the commercial frequency track circuit, it is difficult to make the redundant system necessary for improving the reliability of the audio frequency track circuit into a dual system. As a result, the equipment occupation area becomes large and the commercial power supply Since the phases need to be matched on all lines, signals are supplied from signal high-voltage lines laid around the track circuits of all lines, so construction costs increase.

A conventional train detector (TD) in the above-mentioned audio track circuit is set so that the output impedance of the transmitter matches the load in order to efficiently supply power from the transmitter to the load. Have been.
For this reason, when the train short-circuits between the rails near the sending end of the track circuit, the transmission output decreases, so that a transceiver is provided for each track circuit.

Referring to FIGS. 4 and 5, a description will be given of a train detection device in the conventional audio track circuit. FIG. 4 is a diagram showing a central power transmission type (1 transmission 2 reception) audio track circuit in the conventional train detection device 300,
FIG. 5 is a block diagram showing a circuit configuration of the transceiver 310.

As shown in FIG. 4, in a conventional train detection apparatus 300 in an audio track circuit, one transceiver is provided for two track circuits. For example, track circuit 1
A transceiver 310 is provided for T, 2T, and a transceiver 320 is provided for the track circuits 3T, 4T.

FIG. 4 shows a diagram for simplifying the explanation.
Two transceivers 310, 3 for the track circuits 1T to 4T
Although only 20 are shown, for example, 30 transceivers are required for a 60 track circuit. The plurality of transceivers, including the transceivers 310 and 320, all have the same configuration.

[0008] As shown in FIG.
PU (Central Processing Unit) 311, BUS-I
F (BUS-InterFace) 312a, 312b, 312c,
MOD (MODulater) 313, AMP (AMPlifier) 31
4. A / D (Analog / Digital converter) 315, BP
F (Band Pass Filter) 316a, 316b, RYD
(RelaY Drive) 317 and the like.

The CPU 311 performs oscillation determination, reception determination, failure detection, and the like, and performs BUS-IF 312a, 312b,
12c performs data exchange between the CPU 311 and its peripheral circuits, and the MOD 313 performs oscillation and modulation. A
The MP 314 amplifies the created train detection signal to a predetermined level, the A / D 315 converts an analog signal to a digital signal, the BPFs 316a and 316b remove noise and select only signal waves, and the RYD 317 Relay 1
TR and 2TR are driven.

The AMP 314 is an MT (Maching Trans).
The BPF 316a is connected to the connection unit indicated by reference numeral A2 via MTs 12a and 12b, and the BPF 316a is connected to the connection unit indicated by reference numeral A1 via the MTs 11a and 11b.
b is connected to the connection part indicated by reference numeral A3 in the figure via the MTs 13a and 13b.

The train detection signal output from the AMP 314 is input to a connection portion indicated by reference numeral A2 in the figure, and then the train detection signal is branched at the connection portion A2 and propagates through the track circuits 1T and 2T. The signals are input to the BPFs 316a and 316b via the connection portions indicated by reference numerals A1 and A3, respectively.

[0012]

However, the conventional train detection device 300 in the audio track circuit has the following problems. As shown in FIG. 4, a transmitter / receiver (for example, the transmitter / receiver 310) capable of one transmission and two receptions is provided for every two track circuits. However, when the number of track circuits is large, the number of the transceivers is correspondingly large. In addition, an increase in the number of devices requires more space for installing the devices, and it has been difficult to avoid an increase in cost.

An object of the present invention is to maintain a high detection accuracy and to use a simple method without complicating the circuit configuration.
An object of the present invention is to improve the cost performance of a train detection device in a track circuit using an audible frequency band.

[0014]

The present invention has the following features in order to solve such a problem. In the following description of the means, a configuration corresponding to the embodiment is shown by parentheses as an example. Reference numerals and the like are reference numerals and the like in the drawings described later.

According to the first aspect of the present invention, there is provided an insulated starting circuit or a non-insulated track circuit (for example, a track circuit 1T shown in FIG. 2).
A train detection device (30T) outputs an audio signal for each track circuit to a track configured by linking a plurality of tracks, and receives the output signal for each track circuit to detect the presence or absence of a train ( For example, in the train detection device 100 shown in FIG. 1, a plurality of different frequency signals (for example, the signals f1 to f6 shown in FIG. 2) included in the audible frequency band are output to the plurality of track circuits at the same time. Control means for collectively receiving the output signals for each of the track circuits and detecting the presence or absence of a train for each of the track circuits based on the received signals (for example, the processing unit 110 shown in FIG. 12
0, and a receiving unit 130), and series resistors (for example, series resistors 1 to 5 shown in FIG. 2) respectively inserted on a cable connecting between the control means and the plurality of track circuits. The control means outputs a frequency signal different for each cable to the plurality of track circuits simultaneously via the series resistor.

According to the first aspect of the present invention, an audio signal is output for each track circuit to a track formed by connecting a plurality of insulated starting circuits or non-insulated track circuits, and the output signal is output. In each of the track circuits, in a train detection device that detects the presence or absence of a train, the control unit outputs a plurality of different frequency signals included in an audible frequency band to the plurality of track circuits collectively. The output signals are collectively received for each of the track circuits, and the presence or absence of a train is detected for each of the track circuits based on the received signal, and the series resistance is determined by the control unit and the plurality of track circuits. The control means is inserted on each of the cables connecting between them, and the control means simultaneously outputs a frequency signal different for each cable to the plurality of track circuits via the series resistor.

Therefore, a series resistor is inserted on each cable connecting the control means and the plurality of track circuits to reduce the influence of a load variation in each track circuit. Even if the signals are transmitted in parallel to the track circuits, the independence of the voltage in each of these track circuits can be ensured, and the control means can be shared by a plurality of track circuits. Suppression,
In addition, it is possible to reduce the installation space of the device.

According to a second aspect of the present invention, in the first aspect of the invention, a train on an insulated track (for example, an insulated starting circuit 240 shown in FIG. 3) to which a plurality of the insulated circuits are connected is detected. In the case, the connection cable between the control means and the insulated track is laid by unifying the connection cable from the control means to the vicinity of a predetermined number of insulated track circuits constituting the insulated track. Then, from the connection point to the predetermined number of insulated track circuits to be detected, a plurality of connection cables are laid in parallel, and the series resistors are respectively inserted on the connection cables laid in parallel. Features.

According to the second aspect of the present invention, when a train on the insulated track to which the plurality of insulated circuits are connected is detected, a connection cable between the control means and the insulated track is provided by From the control means to the vicinity of a predetermined number of insulated track circuits constituting the insulated track, the connection cable is unified and laid, and from the connection point to the predetermined number of insulated track circuits to be detected. A plurality of connection cables are laid in parallel, and the series resistors are respectively inserted on the connection cables laid in parallel.

Accordingly, a cable connecting the control means and a predetermined number of the insulated track circuits is branched near these insulated track circuits, and a connection cable between the control means and the predetermined number of the insulated track circuits is provided. Therefore, the train detection device with further improved cost performance can be realized.

The invention according to claim 3 is the invention according to claim 1 or 2
In the invention described, the control means collectively outputs the plurality of audio frequency signals to the plurality of track circuits, receives the output signals collectively for each track circuit, and receives the received signal. A processing function for detecting the presence or absence of a train for each of the track circuits based on

Therefore, according to the third aspect of the present invention, since the control means can detect the presence or absence of a train in a plurality of track circuits, the number of control means in the train detection device can be reduced, and the equipment installation area can be reduced. Along with downsizing, economic efficiency can be improved.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, when the track circuit is short-circuited by a train axle, the control means sets the output impedance to be smaller than the impedance in the track circuit. It is characterized by having been set.

Therefore, according to the present invention, the output impedance of the control means is set to be smaller than the impedance of the track circuit short-circuited by the axle of the train, so that the output signal from the control means has a constant voltage characteristic. , It is possible to further reduce the influence of the load fluctuation in each track circuit on the train detection, and improve the train detection accuracy of the train detection device.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a train detection device in an audio track circuit to which the present invention is applied will be described in detail with reference to FIGS.

[First Embodiment] In the first embodiment, a train detection device 100 in an audio track circuit to which the present invention is applied will be described. FIG. 1 is a block diagram illustrating a configuration of a train detection device 100 to which the present invention is applied, and FIG. 2 is a diagram illustrating a configuration of a transmission system in the train detection device 100.

[0027] As shown in FIG.
Is configured to include a processing unit 110, a transmission unit 120, a reception unit 130, and the like, and can control a track circuit of up to 60 sections. The train detection device 100 is a train detection device for the audio track circuits 1T to 60T, and the track circuits 1T to 60T may be any of an insulated track circuit and a non-insulated track circuit (see FIG. 2). ).

The processing unit 110 includes a CPU 111, a BUS-
IF 112a, 112b, 112c, MOD 113, A
/ D114, RYD115 and the like.

The CPU 111 is a 32-bit fail-safe RISC-CPU and has a ROM (Read Only Memory).
ry) and a RAM (Random Access Memory) (both not shown). The CPU 111 integrates signal generation, modulation, reception determination, failure detection functions, and the like, which were conventionally processed for each track circuit, into a single CPU, so that a single CPU can detect trains on multiple tracks. It becomes possible. In particular, C
The PU 111 includes the orbit circuits 1T to 10 sections shown in FIG.
Control for 60T is performed collectively.

BUS-IF 112a, 112b, 112
c performs data exchange between the CPU 111 and peripheral circuits. The MOD 113 oscillates and modulates, and outputs, to the transmitting unit 120, six patterns of train detection signals modulated at six different frequencies f1 to f6.

Here, the MOD 113 outputs a train detection signal based on the narrow band FSK wave reception test system, that is, the FSK system modulated at a low frequency (1.6 Hz). In the narrow band FSK wave reception test method, two carrier waves fH
(F0 + 20Hz), fL (f0-20Hz) is 31
The output is repeated every 2.5 ms. At the receiving side, each carrier frequency is selected in a narrow band, and a high noise performance is obtained by testing the modulation period and complementarity (signals are received alternately periodically). Is achieved.

The A / D 114 converts each of the 60 analog signals input from the receiver 130 into a digital signal, and the RYD 115 drives the track relays 1TR to 60TR.

The transmitting unit 120 includes six AMPs 121 to 1
26. These AMPs 121 to 126
Are double system amplifiers all having the same configuration. In addition,
In order to simplify the description, FIG.
Only the other AMPs 122 to 125 are omitted.

The six AMPs 121 to 126 have one
The train detection signal of the track circuit for a maximum of 10 sections can be amplified by the unit, and the train detection signals of six different frequencies f1 to f6 output from the MOD 113 are amplified to a predetermined level and transmitted to the track circuit side. Here, AMPs 121 to 12
Since the output impedance of No. 6 is set to a value smaller than the total number of loads of the shared track circuit at the time of short-circuit, the transmission output is made constant.

The receiving unit 130 includes 60 BPFs 101 to
160. These BPFs 101 to 16
0 indicates that A / D 114 is selected by removing noise and selecting only signal waves.
Output to For simplicity of description, FIG.
Only the PFs 101 and 102 and the BPFs 159 and 160 are shown, and other BPFs 103 to 158 are not shown. Each of these 60 BPFs 101 to 160 has two MPFs.
T (not shown) is connected to the track circuits 1T to 60T.

Next, a transmission system in the train detection device 100 will be described. As shown in FIG.
To AMP 126 are sequentially connected to the connection between the track circuits in the track circuits 1T to 60T via two MTs, respectively. For the sake of simplicity, FIG. 2 shows only a part of the track circuit and the connection relation related to the AMP 121, and omits the illustration of the other track circuits and the connection relation related to the AMPs 122 to 126.

The AMP 121 includes a series resistor 1 and an MT1.
a, 1b, is connected to the connection between the track circuits 1T and 2T, and is connected to the connection between the track circuits 13T and 14T via the series resistors 2 and MTs 2a, 2b, and connects the series resistors 3 and MT3a, 3b. Connected to the connection between the track circuits 25T and 26T via the series resistors 4 and the connection between the track circuits 37T and 38T via the MT4a and MT4b, and connected to the connection between the track circuits 37T and 38T via the series resistors 5 and MT5a and 5b. 49T and 5
It is connected to the connection with 0T.

Each of the AMPs 122 to 126 has the AM
Similarly to P121, they are sequentially connected to the connections between the track circuits in the track circuits 1T to 60T. For example,
The AMP 122 is connected to the connection between the track circuits 3T and 4T via one series resistor and two MTs (not shown) provided at the subsequent stage. Hereinafter, similarly, AMP12
2 is a connection part between 15T and 16T, a connection part between 27T and 28T, a connection part between 39T and 40T, and 51T and 52.
The connection to the T is connected via one series resistor and two MTs (not shown). For example,
The AMP 126 is connected to the 11T and 12T via one series resistor and two MTs (not shown) provided at the subsequent stage.
Is connected to the connection part. Hereinafter, similarly, the AMP 126
Is a connection between 23T and 24T, a connection between 35T and 36T, a connection between 47T and 48T, and a connection between 59T and 60T.
, One series resistor and two M
T (not shown).

Thus, the train detection signal of the frequency f1 output from the AMP 121 is input to the connection between the track circuits 1T and 2T, and the AMP1 is connected to the connection between 3T and 4T.
The train detection signal of frequency f2 output from 22 is input, and the train detection signal of frequency f3 output from AMP 123 is input to the connection between 5T and 6T. Further, the train detection signal of the frequency f4 output from the AMP 124 is input to the connection between the track circuits 7T and 8T,
A train detection signal of a frequency f5 output from the AMP 125 is input to a connection with the 0T, and a train detection signal of a frequency f6 output from the AMP 126 is input to a connection of the 11T and 12T.

Further, the order of input of the train detection signals from the connection between the track circuits 13T and 14T to the connection between 23T and 24T is determined in the order from the connection between the above-described track circuits 1T and 2T.
This is the same as the input order of the train detection signal up to the connection between 1T and 12T, and this input order is repeated thereafter.

As described above, the train detection device 100 in the audio track circuit to which the present invention is applied is composed of one CPU 111 and six AMPs 121 to 126.
The track circuits for up to 60 sections can be controlled collectively. Further, a series resistor is connected to each output stage of the AMPs 121 to 126, respectively. In the train detection device 100 in the audio track circuit having the above configuration, the train detection signals of six different frequencies f1 to f6 are respectively AMP.
Parallel transmission is continuously performed from 121 to 126, and a train detection process is performed.

Therefore, since the output impedance of the AMPs 121 to 126 is small, it is possible to make the output signal close to the constant voltage characteristic, and a series resistor (the series resistors 1 to 5 shown in FIG. Including)
Is inserted, the lower limit of the load impedance fluctuation can be maintained at a certain level or more, and each connection part (for example, the track circuit 1T
The influence of the load fluctuation at the connection between the first and second T) can be reduced. For this reason, even if the train detection signal of the frequency f1 output from the amplifier, for example, the AMP 121 is transmitted in parallel to the track circuit for 10 sections, the independence of the voltage at each connection portion of the track circuit is ensured, and the signal is transmitted for 10 sections. Amplifier (AMP121) can be shared for the orbital circuit of
The number of amplifiers can be reduced, the cost can be reduced, and the space for installing equipment can be reduced.

Further, a maximum of 60
Track circuits for sections can be managed, and one CPU 1
Since 11 AMP121s can be connected to the
The number of control devices including U and the like can be reduced, and cost performance can be improved.

Further, since the train detection signal is transmitted in parallel to a plurality of tracks, transmission loss to each track circuit increases. However, it is necessary to select a carrier frequency that avoids harmonics of a power supply frequency, and to perform a narrow band FSK wave reception test. By adopting the method, the noise immunity characteristics and the receiving sensitivity can be improved, and the transmission power can be ensured.

[Second Embodiment] Next, a train detection apparatus 200 according to a second embodiment will be described with reference to FIG. FIG. 3 shows a train detection device 20 to which the present invention is applied.
FIG. 2 is a diagram illustrating a configuration of a transmission system at 0.

In the first embodiment, the train detection processing is performed by six patterns of train detection signals modulated at different frequencies f1 to f6 in order to be effective not only in the insulated track circuit but also in the non-insulated track circuit. there were. In this case, the train detection signals of the frequencies f1 to f6 are AMP121 to 126.
From each of these AMPs (for example, AM
The output signal from P121) was branched into five in the equipment room and output to the track circuit side.

However, particularly when only the insulated track circuit is targeted, even if a signal leaks to an adjacent track circuit due to rail insulation breakdown or the like, train detection can be performed by preparing train detection signals of four different frequencies. . Therefore, as in the case of the train detection device 200 shown in FIG. Becomes possible.

The processing unit and the receiving unit on the transmitting / receiving side of the train detecting device 200 have the same configuration as the processing unit 110 and the receiving unit 130 of the train detecting device 100, and their illustration and description are omitted. I do. As shown in FIG. 3, the transmission unit 220 of the train detection device 200 includes AMPs 121 to 124 of the train detection device 100, and amplifies train detection signals of four frequencies f1 to f4, respectively, to amplify the train detection signals. Output to the side. In particular, the signal system is the same as that of the train detection device 100, and the low-frequency (1.6
Hz).

Further, for the sake of simplicity, FIG.
Although illustration of the connection cables related to 122 to 124 is omitted, the configuration of the cables related to AMPs 122 to 124 is A
These cables are connected to the track circuit so as to be cyclically repeated in the order of f1 to f4 for each track circuit, in addition to being the same as in the case of MP121.

[0050] As shown in FIG.
It is connected in series with MT 210b via 210a. MT
The output stage 210b has five series resistors 220a-22
0e are connected in parallel, and each series resistor 220a-220e
Are respectively ZB (impedance bond) 230a-
Each is connected to the insulated track circuit 240 via 230e. Here, the output impedance of the MT 210b at the site is set to be small, so that the output from the MT 210b can be made closer to the constant voltage characteristic.

In this case, the train detection signal of frequency f1 output from the AMP 121
b, and are output in parallel to the series resistors 220a to 220e, respectively, and output to the insulated track circuit 240 via the ZBs 230a to 230e, respectively.

As described above, in the train detection device 200 according to the second embodiment, the transmission cable from the AMPs 121 to 124 is connected to the MT in the site (for example, the MT 210).
b) Insulated track circuit 2 branched into five at the output stage of b)
40, and each branch path has a series resistance (for example, series resistances 220a to 220e) inserted in series. Further, the output impedance of the in-site MT is set to a small value.

Therefore, by branching the transmission cables from the AMPs 121 to 124 on site, the number of cables between the equipment room and the on-site equipment can be reduced, and the cost performance can be improved.

Further, the on-site MT output is made constant by the low output impedance of the on-site MT.
The load fluctuation can be reduced by inserting a series resistor in each branch path from the power supply. Thereby, at a given transmission point on the insulated track circuit 240, when there is a short circuit due to the train axle, the effect on the train detection performance in other track circuits is reduced.

Further, since the train detection signal is transmitted in parallel to a plurality of tracks, transmission loss to each track circuit increases. However, a carrier frequency that avoids harmonics of the power supply frequency is selected, and a narrow band FSK wave reception test is performed. By adopting the method, the noise immunity characteristics and the receiving sensitivity can be improved, and the transmission power can be ensured.

[0056]

According to the first aspect of the present invention, a series resistor is inserted on each cable connecting the control means and the plurality of track circuits, thereby reducing the influence of load fluctuation on each track circuit. Even if signals having the same frequency are transmitted in parallel to the plurality of track circuits, the independence of the voltage in each track circuit can be ensured, and the control means can be shared by the plurality of track circuits. Therefore, it is possible to reduce the number of devices, suppress costs, and reduce the space for installing devices.

According to the second aspect of the present invention, the cable connecting the control section and the predetermined number of insulated track circuits is branched near these insulated track circuits, and the control section and the predetermined number of insulated track circuits are branched. Since the number of connection cables to the track circuit is reduced, a train detection device with further improved cost performance can be realized.

According to the third aspect of the present invention, the control means can detect the presence or absence of a train in a plurality of track circuits.
The number of control means in the train detection device can be reduced, and the equipment installation area can be reduced and the economic efficiency can be improved.

According to the fourth aspect of the present invention, the output impedance of the control means is set smaller than the impedance of the track circuit short-circuited by the axle of the train, so that the output signal from the control means approaches the constant voltage characteristic. Thus, the effect of load fluctuations in each track circuit on train detection can be further reduced, and the train detection accuracy of the train detection device can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a train detection device 100 to which the present invention has been applied.

FIG. 2 is a diagram showing a configuration of a transmission system in the train detection device 100 to which the present invention is applied.

FIG. 3 is a diagram showing a configuration of a transmission system in a train detection device 200 to which the present invention is applied.

FIG. 4 is a diagram showing a central power transmission type (one transmission and two reception) audio track circuits in a conventional train detection device 300.

FIG. 5 is a block diagram showing a circuit configuration of the transceiver 310 shown in FIG.

[Explanation of symbols]

 Reference Signs List 100 train detection device 110 processing unit 111 CPU 112a, 112b, 112c BUS-IF 113 MOD 114 A / D 115 RYD 120 transmission unit 121-126 AMP 130 reception unit 101-160 BPF 1-5 series resistance 1a, 1b-5a, 5b MT 200 Train detection device 220 Transmitter 210a, 210b MT 220a to 220e Series resistance 230a to 230e ZB 240 Insulated track circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Yoshimura 2-29, Heian-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture 1 within Keizo Seisakusho Co., Ltd. (72) Minoru Sano 2 Heian-cho, Tsurumi-ku, Yokohama-shi, Kanagawa 1-29 chome F-term (reference) in Kyosan Seisakusho, Ltd. 5H161 AA01 BB03 CC13 DD02 DD04 DD25

Claims (4)

[Claims] An audio signal is output for each track circuit to a track formed by connecting a plurality of insulated starting circuits or non-insulated track circuits, and the output signal is received for each track circuit. In a train detection device that detects the presence or absence of a train, a plurality of different frequency signals included in the audible frequency band are output collectively to the plurality of track circuits, and the output signals are collectively output for each track circuit. Control means for detecting the presence or absence of a train for each track circuit based on the received signal, and a series resistor inserted on a cable connecting between the control means and the plurality of track circuits. And the control unit is configured to simultaneously output a frequency signal different for each cable to the plurality of track circuits via the series resistor. 2. When detecting a train on an insulated track to which a plurality of the insulated circuits are connected, a connection cable between the control means and the insulated track connects the insulated track from the control means. Until the vicinity of a predetermined number of insulated track circuits to be configured, the connection cables are unified and laid, and a plurality of connection cables are connected in parallel from the connection point to the predetermined number of insulated track circuits to be detected. The train detection device according to claim 1, wherein the series resistors are inserted on the connection cables laid in parallel. 3. The control means collectively outputs the plurality of audio frequency signals to the plurality of track circuits, receives the output signals collectively for each track circuit, and receives the received signal. 3. A processing function for detecting the presence or absence of a train for each track circuit based on
The train detection device as described. 4. The train detection system according to claim 1, wherein said control means sets an output impedance smaller than an impedance in said track circuit when said track circuit is short-circuited by a train axle. apparatus.