JPH11115758A - Train position detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the train position in a plurality of track circuits by the use of a transmitter/receiver of simple circuit constitution by providing a means detecting the train position by lack of received signal corresponding to which transmitted signal within received signals generated in a time series corresponding to the time series of the transmitted signal. SOLUTION: When a train does not exist on any line of track circuits T1 -Tn , received signals detected by both demodulation parts 11a, 11b appear without being lacked in all the signals f1 '-fn '. When the train A enters the T1 , the rails of the track circuit T1 are short-circuited by the axle of the train A, the received signal f1 ' is not input, and the received signal f1 ' is not detected in the first demodulation part 11a. In this way, disappearing condition of the received signals from the respective track circuits T1 -Tn are changed accompanying advance of the train A, and detecting part 12 detects the position existing on line of the train by the disappearing condition. Hereby, the train can be detected by a simple circuit constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train position detecting device for detecting a train position using a track circuit.

[0002]

2. Description of the Related Art Conventionally, as one method of a train position detecting device using a track circuit, a predetermined one type of transmission signal is sequentially transmitted to a plurality of track circuits, and the plurality of track circuits are transmitted to the transmission signal. 2. Description of the Related Art A scanning method for sequentially receiving data in synchronization with each other is known.

The scanning type train position detecting device of this scanning type will be described more specifically. Now, five track circuits T1
~ T5. First, first, the track circuit T1
When a transmission signal having a predetermined frequency is applied from the transmitter to the start end of the rail (the center of the rail in the case of the center application type) via the switch, the end side of the rail (the center application type) In this case, the signal is received by the receiver from the both ends of the rail) via a switch that works in conjunction with the application of the transmission signal. At this time, if the rail is short-circuited by the axle of the train, no signal is input to the receiver, so it is determined that the train is on the track circuit T1.

After the transmission signal is applied to the track circuit T1 and the signal from the track circuit T1 is received for a predetermined time, the transmission signal is applied to the next track circuit T2, and the track signal from the track circuit T2 is applied. Signal reception is performed in the same manner, and such transmission / reception is repeated in the order of T3 → T4 → T5 → T1 → T2 → T3.

[0005] This scanning type train detection device has a feature that equipment cost can be reduced because a transceiver is not required for each track circuit.

[0006]

However, the above-mentioned conventional scanning type train position detecting apparatus has the advantage that it is not necessary to provide a transceiver for each track circuit, so that the cost can be reduced. However, scanning must be performed for each track circuit while interlocking a switch for applying a transmission signal to the track circuit and a switch for receiving a signal from the track circuit. There was a disadvantage that the configuration became complicated.

The above-described switch for applying a transmission signal and the switch for receiving a reception signal require a check circuit for constantly checking soundness, and further include a train detection signal and a check signal. It is necessary to perform the train detection based on the check of the above, so that not only the circuit configuration becomes complicated, but also the identification algorithm becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to detect the train positions of a plurality of track circuits using a transceiver having a simple circuit configuration. It is to provide a train position detecting device.

[0009]

In order to achieve the above object, a train position detecting apparatus according to the present invention transmits a plurality of transmission signals corresponding to a plurality of track circuits at predetermined regular intervals and periodically. Transmission signal generating means for generating in a time series, applying means for applying the plurality of generated transmission signals to each of the plurality of track circuits, and receiving means for receiving signals from the plurality of track circuits respectively. Receiving signal generating means for generating a received signal in a time series corresponding to the time series of the transmission signal, among the received signals generated in a time series,
Detecting means for detecting a train position based on which transmission signal is missing a reception signal. The transmission signal is applied substantially at the center of the rail forming the track circuit, and the reception signal is received from both sides of the rail.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a train position detecting device according to an embodiment, and FIG. 2 is an explanatory diagram showing a form of a signal in a part of FIG.

A plurality (here, n) of track circuits T1 to T
n is formed by dividing the rails r on which the train A travels into predetermined lengths, and the divided rails r are configured as a part of an electric circuit. In FIG. 1, the train A is shown to travel like track circuits T1, T2,.

The transmitter a is provided with a signal generator 1, an amplifier circuit 2, and a number of filters F1 to Fn corresponding to the plurality of track circuits T1 to Tn. The signal generating section 1 has a plurality of (here, n) transmission signals having predetermined different frequencies (f1 to fn) corresponding to the plurality of track circuits T1 to Tn and having predetermined predetermined intervals. (Hereinafter, the transmission signals will be described as "f1 to fn") in such a manner that the transmission signals can be generated and output in a periodic time series (see FIG. 2).

Each of the filters F1 to Fn is connected to a corresponding one of the transmission signals f1.
To fn, and outputs of the filters F1 to Fn are output from the respective track circuits T1.
It is configured so that the voltage can be applied to the central portion of the rail r of .about.Tn l via a connection transformer.

The receiver b includes a pair of first and second adding circuits 1
0a, 10b and a pair of first and second demodulators 11a, 11a.
b, a detecting unit 12, and a plurality of filters F1 to Fn provided corresponding to the two adding circuits 10a and 10b. A signal from one end of the rail r of each of the track circuits T1 to Tn is input to the first adder circuit 10a through filters F1 to Fn.
b, signals from the other ends of the rails r of the track circuits T1 to Tn are input via filters F1 to Fn. Note that the two addition circuits 10a, 10
The filters F1 to Fn provided corresponding to the filter b are configured to pass signals (f1 to fn) corresponding to the filters F1 to Fn provided in the transmitter a.

The adders 10a and 10b receive the outputs of the filters F1 to Fn and generate a time series corresponding to the time series of the signal from the signal generator 1 of the transmitter a (see FIG. 2). (See FIG. 2).
reference).

Each of the demodulation units 11a and 11b includes
0a and 10b are demodulated to receive signals f1 'to f1 corresponding to transmission signals f1 to fn.
It is configured so that n ′ can be extracted. The detection unit 12 is configured to input signals from the demodulation units 11a and 11b to detect at which position in the track circuits T1 to Tn the train is located.

In the train position detecting device having the above configuration, when no train is present in any of the track circuits T1 to Tn, the received signals detected by both demodulators 11a and 11b are all signals f1 'to f1'. fn 'appears without loss. Therefore, the detection unit 12 determines whether or not the track circuits T1 to Tn
In any of the sections, the fact that no train is present is output to a higher-level device for train control (not shown).

When the train A enters the track circuit T1, the rail r of the track circuit T1 is short-circuited at the axle of the train A. Therefore, the first addition circuit 10a supplies the first addition circuit 10a with the received signals f1 'to fn'. The reception signal f1 'is not input, and the first demodulation unit 11a receives the reception signal f1'.
'Is not detected.

The detection section 12 detects that the first demodulation section 11a has not received the reception signal f1 ', so that the train A detects the train position indicating that it is on the train entry side of the track circuit T1. And outputs it to the host device.

When the train a advances further, the received signal f1 'appears at the first demodulator 11a, and then the received signal f1' at the second demodulator 11b disappears. In this way,
Since the reception signal f1 'to fn' from each of the track circuits T1 to Tn changes in the disappearance state of the reception signal with the progress of the train A, the detection unit 12 detects the location of the train A based on the disappearance state. be able to.

In the above-described example, the transmission signal from the transmitter a is applied to the center of each of the track circuits T1 to Tn. However, the signal is applied to the starting end of each of the track circuits T1 to Tn, and is terminated. The received signal may be obtained from the side. In this case, it is not necessary to double the adder circuit and the demodulator of the receiver b.

[0022]

According to the present invention, there is provided a train position detecting device for generating a plurality of transmission signals corresponding to a plurality of track circuits at predetermined constant intervals and in a periodic time series; Applying means for applying the plurality of generated transmission signals to each of the plurality of track circuits; receiving means for receiving signals from each of the plurality of track circuits; and receiving the signals in a time series of the transmission signals. Since the reception signal generation means to generate in a corresponding time series, and the detection means to detect the train position by which reception signal corresponding to which transmission signal is missing among the reception signals generated in the time series, With a simple circuit configuration, it is possible to perform train detection equivalent to that of the conventional scanning system. Further, when the transmission signal is applied substantially at the center of the rail forming the track circuit and the reception signal is received from both sides of the rail, it is possible to perform fine train position detection.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a train position detecting device according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing signal forms of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 signal generating unit 2 amplifying circuit 10 a first adding circuit 10 b second adding circuit 11 a first demodulating unit 11 b second demodulating unit 12 detecting unit T1 to Tn track circuit r rail F1 to Fn filter b train

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsuichi Inose 1-13-8 Kamikizaki, Urawa-shi, Saitama Japan Signaling Co., Ltd.

Claims (2)

[Claims] A transmission signal generating unit configured to generate a plurality of transmission signals corresponding to a plurality of track circuits at predetermined constant intervals and in a periodic time series; Application means for applying a signal to each of the plurality of track circuits; receiving means for receiving a signal from each of the plurality of track circuits; and reception signal generation for generating the received signal in a time series corresponding to the time series of the transmission signal Means for detecting a train position based on which of the received signals generated in the time series is missing a received signal corresponding to the transmitted signal, the train position detecting device comprising: 2. The train position detecting device according to claim 1, wherein the transmission signal is applied substantially at the center of the rail forming the track circuit, and the reception signal is received from both sides of the rail.