JPH04323918A - Train communication equipment - Google Patents

Abstract

PURPOSE:To attain a high density operation and to shorten the time interval between trains by providing a returning path for a signal current along rails, providing a transmitter-receiver between the rail and the return so as to use it for data transmission/reception with trains. CONSTITUTION:A transmitter 1 has a function of generating a serial data for train control and of modulating the data into an FSK signal and is provided between one rail r2 and one end of a return (a). Moreover, a receiver 2 has a function of democulating a signal sent from a train to ground and is provided between the rail r2 and the other end of the return (a). A signal sent from trains T1, T2 on the rails to the receiver 2 flows through the rail r2 and the return (a) and is inputted to the receiver 2. Since a train position data is sent to the rail r2 through a transmission/reception antenna 3 based on the signal of a tachometer generator G from a preceding train T1, the position data of the preceding train T1 is fetched directly by the succeeding train T2 and the operation of plural trains is attained between a couple of transmitters-receivers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train communication device, and more particularly to one that can contribute to shortening train operating time intervals.

0002

[Prior Art] Conventionally, as shown in FIG. 4, a train communication device usually divides a rail (track) r into a predetermined length to form a track circuit A, and the starting end side of the track circuit A is A transmitter 10 for transmitting a signal at a predetermined frequency is provided at the track circuit A, and a receiver 20 is provided at the terminal end of the track circuit A. Therefore, when there is no train on this track circuit A, a circulating signal current flows between the pair of rails r and r extending from the starting end side to the terminal end side, as shown in FIG. 4(a).

As shown in FIG. 4(b), when a train T1 enters the track circuit A from the terminal side, the axle of the train T1 short-circuits the pair of rails r and r, causing the train to The signal level of T1 and the terminal rail r decreases. Therefore, the receiver 20 detects the train T due to the decrease in signal level.
1 is located in track circuit A. Furthermore, in the case of a system in which the signal sent from the transmitter 10 includes data for controlling the train T1, the signal can be received by the train T1 and the received signal can be used for train control.

0004

[Problems to be Solved by the Invention] However, in the above conventional train communication device, when the signal sent from the terminal side of the track circuit is short-circuited at the axle of the train, there is no signal from the axle to the terminal side. As a result, it is impossible for subsequent trains to enter the track circuit where there is no signal, resulting in the inconvenience that high-density train operation is not possible. That is, as shown in FIG. 4(b), when train T1 is entering track circuit A, there is no signal between train T1 and the terminal, so the following train T2 is not allowed to enter track circuit A. I couldn't get it in. Therefore, conventional train spacing control is carried out on the principle that a track circuit is a block section and that only a single train is allowed to enter a block section.

[0005] In order to shorten the train interval using such a fixed block section system, it is necessary to shorten the length of the block section. However, if the block section is shortened, the number of track circuits will increase accordingly, and equipment such as transmitters and receivers will be required for each track circuit, resulting in an increase in equipment costs. For this reason,
Simply shortening the block section is not a good idea as a means of shortening the time interval.

[0006] Therefore, the present invention has been made to solve the above-mentioned drawbacks, and its purpose is to provide a train transmission system that can send signals to following trains and contribute to shortening time intervals. The goal is to provide equipment.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the system of the present invention provides a return line through which a signal current flows, which is laid along the length of the line, and a return line installed along the length of the line, and one of the rails forming the line. It is characterized by comprising a transmitter provided between one end side of the rail and one end side of the return line, and a receiver provided between the other end side of the rail and the other end side of the return line. Also,
The transmitter is installed between one end of all the rails of the track and one end of the return line, and the receiver is installed between the other end of all the rails of the track and the other end of the return line. It is a feature. Additionally, the transmitter sends a signal current to one rail of the line and sends the signal current to the other rail at 18
The train communication device according to claim 1, wherein the train communication device transmits the signal after rotating it by 0°.

[0008]

[Operation] In the above configuration, when a signal is sent from the transmitter/receiver from one end of one or both of the rails and the return line, the rail and the return line become a communication circuit, and trains on the track receive the signal. can be received. Further, when a signal is sent from the train to the ground side, the signal is inputted via the communication circuit to a receiver provided on one or both rails of the track and the other end of the return line. When the transfer flows through a 180° rotation with one of the rails, a signal current circulates between both rails.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 and 2 are schematic configuration diagrams of a train communication device according to an embodiment, and the same components as those in FIG. 4 described above are given the same reference numerals.

The return line a is composed of a signal cable arranged in the length direction of the line R at a predetermined distance from the rail R. The transmitter 1, like a well-known transmitter for train control, generates predetermined serial data for train control, and transmits the generated serial data to an FSK (frequequen) corresponding to the serial data using a carrier wave.
It has a function of modulating the signal (cy shift keying) and is provided at one end of the rail r2 of the line R and one end of the return line a. The receiver 2 has a function of demodulating signals transmitted from the train to the ground side, and is provided at one end of the rail r2 and the other end of the return track a. Therefore, the signal current from the transmitter 1 flows through the rail r2 and the return line a as a communication circuit, as shown by the arrow in FIG. Further, the signal current sent out from the trains T1 and T2 also flows through the rail r2 and the return line a as a communication circuit. Note that the interval provided between transmitter and receiver 1 and 2 is such that even if the signal level from transmitter 1 is attenuated, it can be received by receiver 2. Therefore, line R is divided into this range and unified. Two track circuits are formed, and transmitters and receivers 1 and 2 are installed for each track circuit.

[0011] Each train (two trains in the illustrated example) T1, T
2 is equipped with a signal processor 2. This signal processor 2 is connected to each train T1, T2 as shown in FIG.
a transmitting/receiving antenna 3 provided on the traveling direction side, an amplifying circuit 4a for amplifying the signal received by the transmitting/receiving antenna 3 from the rail r2, a demodulating circuit 4b for demodulating the amplified signal, and a demodulating circuit 4b for demodulating the demodulated data. , that is, a control circuit 5 which processes the serial data and pulse signals from the speed generator G provided on the axle W and outputs control signals such as brakes for each train T1 and T2; A signal generation circuit 6 that receives a pulse signal and inputs the train number data of its own train to generate and process the position data of its own train necessary for controlling the following train (T2 in the illustrated example), and the generated signal. a modulation circuit 7a that modulates the FSK signal into an FSK signal;
It is composed of an amplifier circuit 7b that amplifies the K signal.

Next, the communication control operation of the device of this embodiment will be explained. Assume now that there are two trains T1 and T2 on the track R as shown in FIG. 1, and a train control signal is being sent from the transmitter 1. Further, it is assumed that signals are sent from each train T1 and T2 toward the ground side receiver 2 side. These signals flow through rail r2 and return line a, and are transmitted to each train T1, T
2, and signals from each train T1 and T2 are input to the receiver 2. In addition, since the preceding train T1 transmits the preceding train position data based on the signal from the speed generator G to the rail r2 via the transmitting/receiving antenna 3, this preceding train's position data is transmitted to the succeeding train. Trains can directly take in the water and operate the train. Therefore, two or more trains can enter between the pair of transmitters and receivers 1 and 2, making it possible to shorten the time interval.

Furthermore, as shown by the dotted line in FIG. 1, when both rails r1 and r2 are electrically coupled, signals are received and received between the transmitting/receiving antenna 3 of each train T1 and T2 and the rail as follows. Since this is done via both rails r1 and r2, signals can be more accurately received and received.

FIG. 3 shows how the signal from the transmitter 1 is transmitted to each rail r.
1 and r2, so that a substantial circulating signal current flows between the rails r1 and r2. That is, the transmitter 1 converts the signal from the signal generator 1a into 2
One signal is input to the transmission section 1b that sends it to the rail r2 and the return line a, and the other signal is sent to the rail r1 and the return line a via the signal phase inversion section 1c.
b'. Therefore, between the rails r1 and r2, via a receiver (not shown),
The signal currents shown by arrows a and b flow and can be turned into signal currents that essentially circulate through the rails r1 and r2, thereby avoiding interference with the drive current of the train T and receiving the signals with less noise. becomes possible.

[0015]

[Effects of the Invention] The train communication device according to the present invention forms a communication circuit with the track and the return track, and communicates with the train via this communication circuit. Even if there are multiple trains in a train, it is possible to communicate with each train, thus contributing to shortening the time interval. Furthermore, when a signal is sent to a pair of rails with their phases reversed, a circulating signal current can be formed between the rails, and noise caused by the train driving current can be cut.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram of a signal processor.

FIG. 3 is a schematic configuration diagram of a train communication device according to another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional block section method.

[Explanation of symbols]

1 Transmitter 2 Receiver 3 Transmitting/receiving antenna r1 ~ r2　　　Rail T, T1 ~ T2 Train R track a Return line

Claims (3)

[Claims] 1. A return line through which a signal current flows, which is laid along the length of the line, and a transmitter provided between one end of one of the rails forming the line and one end of the return line. , a receiver provided between the other end side of the rail and the other end side of the return track. [Claim 2] The transmitter is installed between one end of all the rails of the track and one end of the return line, and the receiver is installed between the other end of all the rails of the track and the other end of the return line. The train communication device according to claim 1, characterized in that: 3. Claim 1, wherein the transmitter sends a signal current to one rail of the line, and sends the signal current to the other rail rotated by 180 degrees.
The train communication device described.