JP3004012B1 - Train detection device - Google Patents

Abstract

A train detection device capable of reliably detecting a failure or malfunction of the device itself is provided. SOLUTION: A signal generating unit which generates a signal pattern which cannot be generated at the time of a failure of the device itself by arranging two types of frequencies by setting different output periods at random, and selecting one from the signal patterns. 9. an oscillation modulator 6, which forms a signal waveform according to the selected signal pattern;
The amplifying unit 7 amplifies the formed signal waveform and transmits it to the track circuit 1 as a train detection signal, the transmission signal verification unit 10 for comparing the transmitted train detection signal with the selected signal pattern, and the track circuit 1. There is provided a received signal test unit 11 for checking a signal received by the receiver unit 8 with the selected signal pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting a train detection signal to each closed section of a train travel path, detecting the presence of a train on the basis of a decrease in the reception level of the train detection signal, and in particular, detecting a failure of the device itself. The present invention relates to a train detection device that can be detected.

[0002]

2. Description of the Related Art In general, train on-rail detection is performed by dividing a train travel path into a plurality of closed sections and detecting in which closed section the train is currently located. For this purpose, a signal obtained by combining a modulated wave of one frequency with a carrier having a frequency different from that of an adjacent closed section is transmitted as a train detection signal to each closed section, and the train is detected according to the reception level of the modulated signal. The presence / absence of a line is determined. That is,
When a train enters one closed section, a short circuit occurs due to the train axle, and the reception level becomes equal to or lower than the detection level, so that the train location in the closed section can be detected. The reason why a carrier having a frequency different from that of the adjacent block section is used is to surely specify the block section in which the train presence is detected. Also in for example, JP 57-104461 and JP-combination for each block section of the track circuit, one of the frequency signal wave on a carrier (f ₁ ~f ₅₎ having different frequencies, respectively (F ₁₎ It is stated to send.

[0003]

In recent years, the above-mentioned train detection signal is generally generated by a microcomputer. However, when a failure or malfunction occurs in the microcomputer, the microcomputer is monotonous, that is, in the same period. Signal oscillation may continue. In the conventional train detection device as described above, since the modulated wave used as the train detection signal is originally output at the same cycle,
It was not possible to discriminate whether the output signal was generated correctly or was continuously oscillated due to a failure or malfunction of the device itself.

[0004] The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a train detection device capable of reliably detecting a failure or malfunction of the device.

[0005]

In the train detecting apparatus according to the present invention, a plurality of signal frequencies are sequentially arranged, and a frequency pattern in which the output periods of the signal frequencies are randomly set to different lengths is created. Means for generating a signal waveform in accordance with the created frequency pattern, means for outputting the generated signal waveform as a train detection signal to a transmitter connected to one end of each closed section of the train travel path, and the created frequency pattern Means for comparing the signal received by the receiver connected to the other end of the closed section with the signal received by the receiver.

Further, the apparatus is provided with means for comparing the created frequency pattern with a signal waveform output to the transmitter as a train detection signal.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram showing a train detection device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a track circuit in a closed section having a train running path, and matching transformers 2 and 2a which are transmitters at both ends thereof.
And matching transformers 3 and 3a as receivers. Further, the signal processing device is configured as a dual system of the active processing device 4 and the standby processing device 4a. 5 (5
a) is an arithmetic processing unit that generates a train detection signal and performs a test process of the signal, and 6 (6a) is an arithmetic processing unit 5 (5a).
The oscillation modulator 7 (7a) that forms a signal waveform based on the signal generated in step (1) is an amplifier that outputs the signal waveform in combination with the carrier to the track circuit 1. 8 (8a)
Is a receiver unit for receiving a signal from the matching transformer 3a. Further, the arithmetic processing unit 5 includes a signal generation unit 9 (9a),
It comprises a transmission signal verification section 10 (10a) and a reception signal verification section 11 (11a). A transmission switch 12 switches between a transmission signal from the active processing device 4 and a transmission signal from the standby processing device 4a.

[0008] The operation of the train detecting device thus configured will be described. First, modulated waves having two types of frequencies are sequentially arranged, and a frequency pattern (hereinafter, referred to as a signal pattern) in which output periods of respective signal frequencies are randomly set to different lengths is created. The output period having a different length randomly is not a monotonous repetition of the same period, and an object of the present invention is to create a signal pattern that cannot be generated when the device itself fails. For example monotonous repetition of the modulation wave 2 period of the modulation wave one period and the frequency f ₂ of the frequency _{f 1 (f 1 → f 2} → f 2 → f 1 → f 2 → f 2 →
If (f ₁ → f ₂ →) is set, similar oscillation may continue even when a failure occurs in the device itself, and in this case, it is impossible to distinguish between normal and abnormal. Therefore, as described above, signal patterns in which different output periods are set at random for the two types of modulated waves are created, and are input in advance from a console or the like.

First, as shown in FIG. 2, a basic pattern of a combination of two modulated waves is prepared. Here, the basic pattern 1 means a combination of one cycle of the first modulated wave and one cycle of the second modulated wave, and the basic pattern 3 means a combination of one cycle of the first modulated wave and two cycles of the second modulated wave. . next,
By arranging the basic patterns 1 to 4 in an arbitrary order, signal patterns a to f as shown in FIG. 3 are generated. That is, the signal pattern a is configured in the order of the basic pattern 1, the basic pattern 2, the basic pattern 3, and the basic pattern 4. According to the example of FIG. 2, one cycle of the first modulated wave, one cycle of the second modulated wave, The signal has a total of 12 periods of 2 periods of 1 modulation wave, 1 period of 2nd modulation wave, 1 period of 1st modulation wave, 2 periods of 2nd modulation wave, 2 periods of 1st modulation wave, and 2 periods of 2nd modulation wave. FIG. 4 shows the signal pattern generated in this manner. Specifically, the first modulated wave is 19 Hz and the second modulated wave is 23.7
Assuming 5 Hz, for example, for signal pattern a, 19 HZ → 2
3.75HZ → 19Hz → 19Hz → 23.75Hz → 19Hz → 23.75Hz → 23.75H
z → 19Hz → 19Hz → 23.75Hz → 23.75Hz

The signal generation unit 9 of the arithmetic processing unit 5 selects and stores one of the signal patterns prepared as described above, and sets the frequency to the oscillation modulation unit 6 by one cycle. Output instructions. The oscillation modulator 6 generates a signal waveform based on the designated frequency. The generated signal waveform is amplified to an appropriate level in the amplifier 7 and transmitted to the track circuit 1 via the matching transformers 2a and 2 as a train detection signal. At this time, the transmitted train detection signal is fed back to the arithmetic processing unit 5, and the transmission signal verification unit 10 checks the signal pattern selected by the signal generation unit 9 with the transmitted train detection signal. As a result, if the signal frequencies match, it can be determined that the device is operating properly. If the signal frequencies do not match, it can be determined that a failure or malfunction has occurred in the oscillation modulator 6 or the amplifier 7.

On the other hand, the transmitted train detection signal is input from the track circuit 1 to the receiver unit 8 of the processing device via the matching transformers 3 and 3a. The matching transformers 2, 2a,
Reference numerals 3 and 3a are for matching impedance between the processing device and the cable. The received signal testing unit 11 of the arithmetic processing unit 5 checks the received signal against the stored signal pattern. As a result, if the signal frequencies match, it can be determined that the device is operating properly. If the signal frequencies do not match, it can be determined that a failure or malfunction has occurred in the receiver unit 8. If the received signal is “absent” or below the detection level,
It indicates that the train is on the track circuit,
This is not a device failure.

While the above description has been made as to the operation in the active processing unit 4, the same operation is also performed in parallel in the standby processing unit 4a. The setting of the signal pattern in the arithmetic processing unit 5a is the same as the setting in the arithmetic processing unit 5, and the receiver unit 8a receives the signal from the track circuit 1 in parallel with the receiver unit 8 via the matching transformers 3 and 3a. ing. If the transmission signal is verified by the transmission signal verification unit 10,
Alternatively, in the test of the received signal by the received signal test unit 11, if it is determined that the device itself has failed or malfunctioned, the active processing device 4 shifts the entire device to a stop state, and at the same time, the transmission switch 12 Standby processing unit 4a
Is switched to transmit the signal pattern output from the as a train detection signal, and the standby processing device 4a is shifted to the active processing device 4. Thereby, sound operation can be continued as a train detection device.

As described above, by arranging two signal modulation waves at random with different output periods, a signal pattern which cannot be generated when the device itself fails is generated and transmitted as a train detection signal. Therefore, it is possible to reliably detect a state in which a simple repetitive pattern is continuously output due to a failure of the fixed state of the hardware of the apparatus or a malfunction of the software. Thereby, a highly reliable train detection device can be obtained. In the above description, two types of frequencies are used for the signal modulation wave. However, if three or more types of frequencies are combined, more signal patterns are generated and more reliable failure detection can be performed. In addition, the manner of frequency arrangement is not limited to the above example, and a more complicated signal pattern can be generated.

[0014]

Since the present invention is configured as described above, it has the following effects.

A plurality of signal frequencies are randomly set at different output periods, and a frequency pattern is sequentially arranged. A signal waveform generated according to the frequency pattern is connected to one end of a track circuit as a train detection signal. Since the signal output to the transmitter and received from the receiver connected to the other end of the track circuit is compared with the created frequency pattern, it is possible to reliably detect the abnormality of the device.

Further, since the signal waveform transmitted as the train detection signal is fed back and collated with the generated frequency pattern, a transmission abnormality of the device can be easily detected.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a basic pattern of a combination of two modulated waves.

FIG. 3 is a diagram showing an example of an array of basic patterns in FIG. 2;

FIG. 4 is a diagram showing a signal pattern generated by the arrangement of FIG. 3;

[Explanation of symbols]

1 track circuit, 4 operation system processing unit, 5 arithmetic processing unit,
6 Oscillation modulation section, 7 Amplification section, 8 Receiver section, 9 Signal generation section, 10 Transmission signal verification section, 11 Received signal verification section.

Continuation of front page (56) References JP-A-10-264819 (JP, A) JP-A-10-264818 (JP, A) JP-A-4-358960 (JP, A) JP-A-4-78658 (JP) , A) JP-A-60-15259 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61L 1/00-23/34

Claims (2)

(57) [Claims] 1. A train detection signal is sent to a ground facility that divides a track, which is a traveling route of a train, into a plurality of closed sections and connects a transmitter to one end of each closed section and a receiver to the other end. A train detection device that transmits from the transmitter side to the receiver side, measures the level of the train detection signal received by the receiver side, and detects the presence of a train on the basis of a decrease in the measured level. , A means for generating a frequency pattern in which the output periods of the respective signal frequencies are randomly set to different lengths, a means for generating a signal waveform in accordance with the generated frequency pattern, and the train detection for the generated signal waveform Means for outputting the signal as a signal to the transmitter, and means for comparing the created frequency pattern with the signal received at the receiver side. When the train detection device and detects an abnormality of the apparatus. 2. A means for comparing the generated frequency pattern with a signal waveform output to a transmitter as a train detection signal, and detecting an abnormality of the apparatus if the result of the comparison is inconsistent. The train detection device according to claim 1, wherein