JP4073103B2 - Train position detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scanning train position detection device that detects train positions by sequentially transmitting train detection signals to a plurality of track circuits.
[0002]
[Prior art]
The present applicant previously described in Japanese Patent Application No. 9-281936 a switch for applying train detection signals to a plurality of track circuits and a switch for receiving signals received from the plurality of track circuits. We propose a scanning type train position detection device using separation by a filter that does not need to be used.
[0003]
As shown in FIG. 3 (1), the train position detection apparatus according to the above proposal has a plurality of track circuits (hereinafter, for the sake of simplicity, description will be made with six track circuits) T1 to T6 ( 6 train detection signals f1 to f6 corresponding to the track circuit in FIG. 1 described later) are generated, and the train detection signals f1 to f6 are generated in time series and applied to the track circuits T1 to T6. I am doing so.
[0004]
From each track circuit T1 to T6, an applied time-series train detection signal f1 to f6 as shown in FIG. 3 (2) is displayed with no train on each track circuit T1 to T6. Corresponding time-series received signals f1 'to f6' are received, respectively. Accordingly, if there is a missing received signal among these received signals f1 'to f6', for example, if the received signal f1 'is missing, it is on the track circuit T1 corresponding to the received signal f1'. A train can be detected.
[0005]
[Problems to be solved by the invention]
The train position detection device according to the above proposal has a feature that the circuit configuration is simple because it does not require a switch because it is separated by a filter when train position detection is performed by a scanning method. It has an excellent feature that does not require a check circuit and algorithm for checking the soundness of the image.
[0006]
By the way, in the train position detection device according to the above proposal, as the number of track circuits increases, the scanning cycle becomes longer and the train detection timing becomes the same as the train type train position detection device using the conventional switching device. It has the property of being delayed by minutes.
[0007]
Further explaining with reference to FIG. 3, one scanning period T2 is six times as long as one slot for each of the track circuits T1 to T6. Therefore, if the number of slots, that is, the number of track circuits is increased, the corresponding amount is increased. The scanning period T2 is long.
[0008]
Usually, in the train position detection of the scanning method, when the same reception state is obtained by a plurality of (for example, two) scannings, for example, in the two scannings, the received signal f1 'is lost twice. When there is a train, the presence of a train is detected in the track circuit T1 corresponding to the received signal f1 '. Therefore, if the scanning cycle is long, the train position detection timing is delayed by that amount.
[0009]
In addition, if the timing of the train position detection is delayed in this way, there is a new problem that transmission of a train control signal such as ATC (hereinafter described as “ATC signal”) to the detected train is delayed. Will occur.
[0010]
That is, in the case of a train control device in which an ATC signal is sent instead of the train position detection signal up to that time, the train enters the track circuit where the train is detected. It takes a predetermined time until the ATC signal is received from, and the predetermined time is a no-signal state in which the ATC signal cannot be received. Therefore, when the no-signal time exceeds the time for operating the train safety device, the safety device is activated, which may hinder the efficient operation of the train.
[0011]
Therefore, the present invention is an improvement of the train position detection apparatus according to the above proposal, and an object thereof is to provide a train position detection apparatus that can shorten the scanning time.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the train position detection device according to the present invention generates a plurality of transmission signals having a predetermined constant interval corresponding to a plurality of track circuits, and the generated plurality of the plurality of transmission signals. The transmission signal is divided into a plurality of signals, and the divided transmission signals are superimposed, and the superimposed signal generation means for generating the superimposed superimposed signal into a periodic time-series signal; Applying means for applying to each of the track circuits, receiving means for receiving signals from the plurality of track circuits, and received signal generating means for generating the received signals in a time series corresponding to the time series of the superimposed signals And detecting means for detecting a train position based on which transmission signal corresponding to which transmission signal is missing among the reception signals generated in time series.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a train position detection device according to an embodiment, and FIG. 2 is an explanatory diagram showing signal forms of portions (1) and (2) of FIG.
[0014]
A plurality (six in this case) of track circuits T1 to T6 are formed by dividing the rail r on which train A travels into predetermined lengths, and the divided rail r is configured as a part of the electric circuit. Yes. In FIG. 1, the train A is shown to travel like track circuits T1, T2,.
[0015]
The transmitter a is provided with a signal generator 1, an amplifier circuit 2, and a number of filters F1 to F6 corresponding to the plurality of track circuits T1 to T6. The signal generator 1 has a plurality of (here, six) having predetermined frequencies (f1 to f6) different from each other corresponding to the plurality of track circuits T1 to T6 and having a predetermined constant interval (slot). The transmission signal (hereinafter referred to as “f1 to f6”) is divided into two, and the transmission signal generated in a periodic time series in a superimposed state can be output (see FIG. (See 2 (1)). That is, the signal generator 1 is configured to superimpose the transmission signals f1, f2, f3, f4 and f5, f6 and to output the transmission signals f1, f2, f3, f4 and f5, f6 in this order. .
[0016]
Each of the filters F1 to F6 is configured in a band through which each of the transmission signals f1 to f6 passes, and the outputs of the filters F1 to F6 are connected to a central portion of the rail r of each track circuit T1 to T6. It is comprised so that it can apply via.
[0017]
The receiver b can be a pair of first and second adder circuits (or a pair of selection circuits, but will be described here as an adder circuit) 10a and 10b and a pair of first and second demodulator units 11a. 11b, a detection unit 12, and a plurality of filters F1 to F6 provided corresponding to both the addition circuits 10a and 10b. A signal from one end of the rail r of each track circuit T1 to T6 is input to the first adder circuit 10a via the filters F1 to F6, and each track circuit is input to the second adder circuit 10b. A signal from the other end side of the rail r of T1 to T6 is input through the filters F1 to F6. The filters F1 to F6 provided corresponding to both the adder circuits 10a and 10b are in a band that passes signals (f1 to f6) respectively corresponding to the filters F1 to F6 provided in the transmitter a. It is configured.
[0018]
Both adder circuits 10a and 10b receive the outputs of the filters F1 to F6, and in a time series corresponding to the time series of the signal from the signal generator 1 of the transmitter a (see (1) in FIG. 2), That is, the received signals f1 ', f2', f3 ', f4' and f5 ', f6' are superimposed and can be generated into a time-series signal (see (2) in FIG. 2). .
[0019]
Both demodulation sections 11a and 11b are configured to demodulate the signals input from the adder circuits 10a and 10b, respectively, and extract the received signals f1 'to f6' corresponding to the transmission signals f1 to f6. The detection unit 12 is configured to be able to detect the position where the train is located in the track circuits T1 to T6 by inputting signals from both the demodulation units 11a and 11b.
[0020]
In the train position detecting apparatus having the above configuration, when no train is present in any of the track circuits T1 to T6, the received signals detected by both the demodulating units 11a and 11b are all signals f1 'to f6'. Appear without missing. Therefore, the detection part 12 will output that the train is not in any section in track circuit T1-T6 to the high-order apparatus for train control which is not shown in figure.
[0021]
By the way, when the train A enters the track circuit T1, the rail r of the track circuit T1 is short-circuited by the axle of the train A, so that the first adder circuit 10a receives the received signal f1 among the received signals f1 'to f6'. 'Is not input, and the received signal f1' is not detected in the first demodulator 11a.
[0022]
The detection unit 12 detects the train position indicating that the first demodulation unit 11a has not received the reception signal f1 ', and that the train is on the train entry side of the track circuit T1, Is output to the host device.
[0023]
As the train A further progresses, the received signal f1 'appears in the first demodulator 11a, and then the received signal f1' from the second demodulator 11b is lost (disappears). In this way, since the reception signal f1 'to f6' from each track circuit T1 to T6 changes in the missing state of the received signal as the train A progresses, the detector 12 detects the train signal of The standing line position can be detected.
[0024]
In the above example, the transmission signal from the transmitter a is applied to the center of each of the track circuits T1 to T6, but is applied to the start side of each track circuit T1 to T6 and received from the end side. A signal may be obtained. In this case, the adder circuit and the demodulator of the receiver b do not need to be doubled.
[0025]
In the above example, the number of track circuits is six. However, the number of tracks may be less or more, and the number of overlapping stages is not two but three or more. You can also. As the number of stages increases, the scanning time is shortened.
[0026]
【The invention's effect】
The train position detection device according to the present invention divides a plurality of transmission signals generated into a plurality of transmission signal generation means for generating a plurality of transmission signals having a predetermined constant interval corresponding to a plurality of track circuits, The superimposed transmission signal is superimposed, and the superimposed signal generating means for generating the superimposed superimposed signal into a periodic time-series signal is applied to each of the plurality of track circuits. An application unit, a reception unit that receives signals from each of the plurality of track circuits, a reception signal generation unit that generates a received signal in a time series corresponding to the time series of the superimposed signal, and a time series generated Because it consists of detection means that detects the train position depending on which received signal corresponding to which transmission signal is missing among the received signals, train detection is performed by shortening the scanning time Door can be.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a train position detection apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing signal forms of portions (1) and (2) in FIG.
FIG. 3 is an explanatory diagram showing a signal format according to the previous proposal;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Signal generation part 2 Amplifying circuit 10a 1st addition circuit 10b 2nd addition circuit 11a 1st demodulation part 11b 2nd demodulation part 12 Detection part T1-T6 Track circuit r Rail F1-F6 Filtery Train

Claims (1)

Transmission signal generating means for generating a plurality of transmission signals having a predetermined constant interval corresponding to a plurality of track circuits;
A superimposed signal generating means for dividing the generated plurality of transmission signals into a plurality of signals, superimposing the divided transmission signals, and generating the superimposed superimposed signals into periodic time-series signals;
Applying means for applying the generated superimposed signal to each of the plurality of track circuits;
Receiving means for receiving signals from each of the plurality of track circuits;
A received signal generating means for generating a received signal in a time series corresponding to the time series of the superimposed signal;
Detection means for detecting the train position depending on which transmission signal corresponding to which transmission signal is missing among the reception signals generated in time series,
A train position detecting device comprising:

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