JP3290400B2 - Train position detection device - Google Patents

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 FIG. 3 is a schematic configuration diagram of a conventional train position detecting device using a track circuit, in which a rail r on which a train A travels is divided into predetermined lengths, (In this case, n rails) with the rails as part of the electric circuit
Are shown.

[0003] At the starting end of the rail r of each of the track circuits 1T to nT (on the side from which the train A advances from each of the track circuits 1T to nT), a device is provided in the equipment room R via connection transformers t, t. The transmission signals from the transmitters TX1 to TXn are respectively applied. Further, the end side of the rail r of each of the track circuits 1T to nT (each of the track circuits 1T to 1T).
Signals received from the trains n and nT, respectively, are received by the receivers RX1 to RXn provided in the equipment room R via the connection transformers t, t.

In the train position detecting device having the above structure, the operation of detecting the position of the train will be described by taking the track circuit 1T as an example. When the train A is not on the track circuit 1T, the rail r is short-circuited at the axle of the train A. The transmission signal from the transmitter TX1 is received by the receiver RX1. Therefore, it is possible to detect that there is no train on the track circuit 1T by the fact that the receiver RX1 receives the signal.

On the other hand, when the train A is on the track circuit 1T, the transmission signal from the transmitter TX1 is short-circuited by the axle of the train A, and the reception level of the receiver RX1 is reduced. Therefore, the presence of the train in the track circuit 1T can be detected when the receiver RX1 cannot receive the signal.

The above-described train detection operation is similarly performed in the other track circuits 2T to nT.

[0007]

However, the above-mentioned conventional train position detecting apparatus requires a cable for transmitting a transmission signal from the equipment room for each track circuit and a cable for receiving the reception signal. As the number of track circuits increases, the number of cable cores increases proportionately.

More specifically, referring to the example shown in FIG. 3, an n-core cable is required from the equipment room R to the starting end of each of the track circuits 1T to nT, and the equipment room is set from the terminal side of each of the track circuits 1T to nT. Up to R, an n-core cable is required, which has the drawbacks of complicating cable laying and increasing equipment costs.

The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to provide a train position detecting device capable of reducing the number of cores of a cable.

[0010]

In order to achieve the above object, a train position detecting apparatus according to the present invention comprises a plurality of transmission signals having different frequencies assigned to respective track circuits of a plurality of track circuits. Transmission signal generating means for generating a plurality of transmission signals to the plurality of track circuits via a single cable, and from the cable to the starting end of each track circuit of the plurality of track circuits. An applying means for sequentially applying a frequency assigned to each track circuit through a filter for passing the frequency, and a filter for passing the frequency assigned to each track circuit from the terminal side of each track circuit of the plurality of track circuits. search receiving means for receiving sequentially via the one cable signals were corresponding to the transmission signal applied to the starting end of each track circuit, a column wheel position to detect the presence or absence of the received signal Te A train position detection means for, is characterized in that it consists of.

[0011]

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 detection device according to one embodiment. The same components as those in the conventional example shown in FIG. 3 will be described using the same reference numerals.

A plurality (here, n) of track circuits 1T-n
T divides the rail r on which train A travels into a predetermined length,
Each of the divided rails r is formed as a part of an electric circuit.

On the starting end side of the rail r of each of the track circuits 1T to nT (on the side from which the train A advances from each of the track circuits 1T to nT), a transmission signal from a transmitter TX provided in the equipment room R is transmitted. It is configured to be applied via a two-core cable C1.

The transmitter TX generates a plurality of transmission signals f1 to fn having different frequencies f1 to fn corresponding to the respective track circuits 1T to nT (hereinafter, the transmission signals are referred to as f1 to fn). It comprises a plurality of signal generators a1 to an, an addition circuit 1 for adding a plurality of transmission signals f1 to fn, and an amplification circuit 2 for amplifying the added signal and supplying it to a cable C1.

Transmission signals f1 to fn from the cable C1
Are respectively connected to the respective track circuits 1T to 1T through the sorting circuits TX1 to TXn.
It is configured to be applied to the starting end of nT. That is, each of the discriminating circuits TX1 to TXn is a band pass filter F1, F2, which allows only the transmission signals for the track circuits 1T to nT to pass between the connecting transformers t, t (only the track circuit 1T is disclosed in FIG. 1). Is provided, and therefore, the transmission signal f assigned to each of the track circuits 1T to nT is provided at the starting end of each of the track circuits 1T to nT.
1 to fn can be applied respectively.

The transmission signals f1 to fn are applied to each of the track circuits 1T to nT.
n is circulated every predetermined time, that is, f1 → f
.., Fn, f1, f2, f3,... May be applied in time series.

Each signal from the terminal side of each of the track circuits 1T to nT is collected by a two-core cable C2 via a separation circuit RX1 to RXn configured in the same manner as the above separation circuits TX1 to TXn. , A receiver R provided in the equipment room R
It is configured to be input to X. Note that the classification circuits RX1 to RXn can be omitted when the noise state of the track circuits 1T to nT does not affect reception.

The receiver RX has a plurality of band-pass filters F1 to Fn for separating signals (f1 to fn) collected from the respective track circuits 1T to nT, and also has a plurality of band-pass filters F1 to Fn. Output of the orbit relay T
It is configured to be input to demodulation units b1 to bn having R1 to TRn, respectively.

The train position detecting operation of the train position detecting device having the above-described configuration will be described by taking the track circuit 1T as an example. When the train A is not on the track circuit 1T, the transmission signal f1 transmitted from the transmitter TX is transmitted. Is a classification circuit TX
1 is applied to the track circuit 1T. Then, the applied transmission signal f1 is received by the demodulation unit b1 via the classification circuit RX1 and the band-pass filter F1. Accordingly, the track relay TR1 is lifted by the demodulation unit b1 receiving the signal, and it is detected that there is no train on the track circuit 1T.

On the other hand, when the train A is on the track circuit 1T, the transmission signal f1 from the transmitter TX is short-circuited by the axle of the train A, and the reception level of the demodulation unit b1 is reduced. Accordingly, when the demodulation unit b1 cannot receive a signal, the track relay TR1 falls, and it is detected that the train is present in the track circuit 1T.

The above-described train detection operation is similarly performed in the other track circuits 2T to nT.

As described above, the transmission signals f1 to fn are separately applied to the respective track circuits 1T to nT, and the signals collected from the respective track circuits 1T to nT are separated to receive the respective track circuits 1T to nT. Since the signals f1 to fn are respectively extracted, the cable C1 for supplying each of the track circuits 1T to nT requires only two cores, and the cable C2 for the reception signal from each of the track circuits 1T to nT is also required. Two cores are enough. Therefore, the laying of the cables C1 and C2 is simplified, and the equipment cost can be reduced.

FIG. 2 shows a train position detecting apparatus according to another embodiment of the present invention. The difference from FIG. 1 is that a changeover switch S1 is provided instead of the adding circuit 1 of the transmitter TX. The demodulators b1 to bn of the receiver RX are formed as a single demodulator b, and the demodulator b is connected to the switch S
Through the switch S2 for synchronization 1 fill of the present invention
The output of each of the band-pass filters F1 to Fn corresponding to the filter is input.

As described above, when the transmission signals f1 to fn are sequentially applied by the scanning method and the reception signals can be sequentially received, the number of cores of the cables C1 and C2 is reduced as in the case of FIG. In addition, the configuration of the receiver RX can be simplified.

[0025]

According to the present invention, there is provided a train position detecting device for generating a plurality of transmission signals having different frequencies assigned to respective track circuits of a plurality of track circuits. A filter for transmitting a plurality of transmission signals to the plurality of track circuits through a single cable, and passing a frequency assigned to each track circuit from the cable to a start end of each track circuit of the plurality of track circuits. And a transmission signal applied to the starting end of each track circuit via a filter that passes a frequency assigned to each track circuit from the terminal side of each track circuit of the plurality of track circuits. since comprised of a receiving means for receiving sequentially via the signal one cable which is associated, a train position detection means for detection known columns vehicle position by detecting the presence or absence of the received signals, each Cable for supplying the road circuit sufficient in two-core, also suffice cables 2 cores for the received signal from each track circuit. Therefore, the installation of the cable is simplified, and the equipment cost can be reduced. In addition, since transmission / reception is performed via a filter that passes a frequency assigned to each track circuit, erroneous detection can be prevented. Further, the configuration of the receiver can be simplified. Furthermore, even if the transmission signal transmission and the reception signal reception are each one cable, the transmission signal transmission and the reception signal reception are sequentially performed for each track circuit, so that signal interference can be efficiently prevented. Can be.

[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.

FIG. 2 is a schematic configuration diagram of a train position detecting device according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional train position detecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Addition circuit 2 Amplification circuit r rail 1T-nT track circuit b Train a1-an signal generation circuit F1-Fn Bandpass filter RX1-RXn, TX1-TXn classification circuit b, b1-bn Demodulation part TR, TR1-TRn Track relay

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-20557 (JP, A) JP-A-53-11410 (JP, A) JP-A-11-115758 (JP, A) 143073 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61L 1/18

Claims (1)

(57) [Claims] 1. A transmission signal generating means for generating a plurality of transmission signals having different frequencies respectively assigned to the respective track circuits of the plurality of track circuits, and transmitting the plurality of generated transmission signals to one cable. Application means for transmitting to the plurality of track circuits through the filter, and sequentially applying the frequency assigned to each track circuit to the starting end of each track circuit of the plurality of track circuits from the cable, A signal corresponding to a transmission signal applied to the starting end of each track circuit from a terminal side of each track circuit of the plurality of track circuits through a filter that passes a frequency assigned to each track circuit, to one cable receiving means for receiving sequentially via the train position detection means for detection known columns vehicle position by detecting the presence or absence of the received signal, the train position detection apparatus characterized by comprising a.