JP2001114105A - Automatic train control and on-ground train detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ATC/TD on-ground device which can lower a peak value of a superimposed wave consisting of an ATC signal wave and a TD signal wave, in which an amplifier, a coupler and the like used for processing the superimposed wave can have a small capacity, and which can reduce the installation cost. SOLUTION: An ATC/TD on-ground device 1 issues an ATC signal wave S1 and a TD signal wave S2. The ATC signal wave S1 is obtained by intermittently modulating a carrier wave S11. Similarly, the TD signal wave S2 is also obtained by intermittently modulating a carrier wave S21. The ATC signal wave S1 and the TD signal wave S2 are issued with such a timing that a period T1 during which the carrier wave S11 is held does not overlaps with a period T2 during which the carrier wave S12 is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an automatic train control signal wave (ATC signal wave) and a train detection signal wave (TD signal wave).
Train control / train detection ground equipment (ATC /
TD ground equipment).

[0002]

2. Description of the Related Art As is well known, an automatic train control ground device (ATC ground device) is an ATC signal indicating an allowable speed of a train in accordance with an interval between the train and a preceding train and a state of opening of a course. Output a wave. The ATC signal wave is provided as an amplitude modulated wave obtained by intermittently modulating a carrier with an ATC modulated wave. Therefore, the ATC signal wave is an intermittent wave that repeats a period in which a carrier is maintained and a period in which there is no carrier according to the frequency of the ATC modulated wave.

On the other hand, a train detection ground device (TD ground device)
Outputs a TD signal wave. The TD signal wave is provided as an amplitude modulated wave obtained by intermittently modulating a carrier with a predetermined TD modulated wave. Therefore, like the ATC signal wave, the TD signal wave also includes a period in which the carrier is maintained and a period in which the carrier is not present.
An intermittent wave that repeats according to the frequency of the TD modulation wave.

In a case where both the ATC signal wave and the TD signal wave are supplied to the track circuit, one method is to superimpose the ATC signal wave and the TD signal wave on each other to generate a superimposed wave, and amplify the superimposed wave by an amplifier. And supply it to the track circuit.

[0005] In another method, an ATC signal wave and a TD signal are used.
The signal wave is amplified separately. And the amplified ATC
The signal wave and the TD signal wave are superimposed on each other by a coupler to generate a superimposed wave, and the superimposed wave is supplied to the track circuit.

[0006] Conventional ATC ground equipment and TD
In the terrestrial device, the ATC modulated wave and the TD modulated wave are asynchronous with each other. Therefore, the ATC signal wave and the TD signal wave are output such that the duration of the carrier wave overlaps with each other in time. Therefore, when the ATC signal wave and the TD signal wave are superimposed, the peak value of the superimposed wave becomes the ATC signal wave or the TD signal wave.
It is larger than the individual peak value of the signal wave.

Further, since the peak value of the superimposed wave is large as described above, a large-capacity amplifier or coupler must be used for handling the superimposed wave. As a result, equipment costs increase.

[0008]

The object of the present invention is to provide an AT
It is an object of the present invention to provide an ATC / TD ground apparatus capable of lowering the peak value of a superimposed wave of a C signal wave and a TD signal wave.

Another object of the present invention is to provide an ATC / TD terrestrial apparatus that can use a small-capacity amplifier or coupler for handling a superimposed wave of an ATC signal wave and a TD signal wave.

[0010] Still another object of the present invention is to provide an ATC / TD ground apparatus capable of reducing equipment costs.

[0011]

In order to solve the above-mentioned problems, an ATC / TD ground apparatus according to the present invention outputs an ATC signal wave and a TD signal wave. The ATC signal wave and the TD signal wave are signal waves obtained by intermittently modulating a carrier, and are output at timings in which the durations of the carrier do not overlap with each other.

The above-described ATC / TD ground apparatus of the present invention outputs an ATC signal wave and a TD signal wave. The ATC signal wave and the TD signal wave are signal waves obtained by intermittently modulating a carrier wave.

As described above, in the conventional ATC terrestrial equipment and TD terrestrial equipment, the ATC signal wave and the TD signal wave are outputted such that the durations of the carrier waves overlap with each other in time. For this reason, when the ATC signal wave and the TD signal wave are superimposed, the peak value of the superimposed wave becomes
It becomes larger than the individual peak value of the D signal wave.

On the other hand, in the ATC / TD terrestrial equipment of the present invention, the ATC signal wave and the TD signal wave are output at timings in which the durations of the carrier waves do not overlap with each other. Therefore, when the output ATC signal wave and TD signal wave are superimposed, the peak value of the superimposed wave becomes equal to either the peak value of the ATC signal wave or the peak value of the TD signal wave, and the peak value of the superimposed wave decreases. Can be done.

Further, since the peak value of the superimposed wave decreases as described above, a small-capacity amplifier or coupler that handles the superimposed wave can be used. Therefore, equipment costs can be reduced.

The other features of the present invention and the operation and effect thereof will be described in more detail with reference to the accompanying drawings. The accompanying drawings show by way of example only.

[0017]

FIG. 1 shows an ATC / T according to the present invention.
FIG. 2 is a diagram schematically illustrating a configuration of a D ground device, and FIG. 2 is a diagram illustrating an operation of the ATC / TD ground device illustrated in FIG. 1. As shown in FIG. 1, the ATC / TD ground apparatus 1 of the illustrated embodiment outputs an ATC signal wave S1 and a TD signal wave S2. In the embodiment, the ATC / TD ground device 1
An ATC signal wave output unit 11 and a TD signal wave output unit 12 are included.

The ATC signal wave output section 11 generates and outputs an ATC signal wave S1. ATC signal wave S1 output
2 (c) is shown in FIG. As illustrated, the ATC signal wave S1 is a signal wave obtained by intermittently modulating the carrier wave S11. FIG. 2A shows a waveform diagram of the carrier wave S11. The illustrated carrier S11 has a constant frequency and a constant amplitude. The carrier S11 in the embodiment is a sine wave having a frequency of 4 kHz.

More specifically, the ATC signal wave S1 is the carrier wave S
11 is a signal wave intermittently modulated by the ATC modulation wave S12. FIG. 2B shows a waveform diagram of the ATC modulated wave S12. The ATC modulated wave S12 has a waveform suitable for intermittently modulating the carrier S11. The illustrated ATC modulated wave S12
Is a trapezoidal wave, but may be a rectangular wave.

As is well known, the ATC signal wave output unit 11 is supplied with signal indication information U1. The frequency of the ATC modulated wave S12 described above changes according to the allowable speed indicated by the signal indication information U1. For example, the allowable speed is 90 km / h
At this time, the frequency of the ATC modulated wave S12 is 10 Hz, and when the allowable speed is 45 km / h, the ATC modulated wave S1
The frequency of 2 is 16 Hz.

The TD signal wave output section 12 outputs the TD signal wave S2
Is generated and output. FIG. 2F shows a waveform diagram of the output TD signal wave S2. As shown, the TD signal wave S2
Is a signal wave obtained by intermittently modulating the carrier wave S21. FIG. 2D shows a waveform diagram of the carrier wave S21. Carrier S2 shown
No. 1 has a constant frequency and a constant amplitude. The frequency of the carrier S21 is different from the frequency of the carrier S11 described above. The carrier S21 of the embodiment has a frequency of 15 kHz.
Sine wave.

More specifically, the TD signal wave S2 is the carrier wave S2
1 is a signal wave intermittently modulated by the TD modulation wave S22. FIG. 2E shows a waveform diagram of the TD modulation wave S22. T
The D modulated wave S22 has a waveform suitable for intermittently modulating the carrier S12. The illustrated TD modulation wave S22 is a trapezoidal wave, but may be a rectangular wave.

As shown in FIGS. 2C and 2F,
The ATC signal wave S1 and the TD signal wave S2 correspond to the carrier wave S11.
T1 and the duration T of the carrier S21
2 are output at timings that do not temporally overlap each other. In the embodiment, the output control described above is performed by the ATC signal wave output unit 11 controlling the TD signal wave output unit 12.

Next, the ATC signal wave S1 and the TD signal wave S
2 will be described. In the track 3, a plurality of track circuits 0T to 3T are sequentially formed. Although these track circuits 0T to 3T are non-insulated in the embodiment,
It may be an insulated type. Adjacent track circuits 1T, 2T
A transmission point K1 is set at the boundary between them. Further, a power transmission / reception point K0 is set at a boundary between the adjacent track circuits 0T and 1T, and a power transmission / reception point K2 is set at a boundary between the adjacent track circuits 2T and 3T.

TD output from TD signal wave output unit 12
The signal wave S2 is supplied to the superimposition point 58. The ATC signal wave S1 output from the ATC signal wave output unit 11 is supplied to the switch 50. The switch 50 selects the power transmission point K1 or the power transmission / reception point K2. FIG. 1 shows that the switch 50 has a transmission point K
The case where 1 is selected is shown.

First, the case where the switch 50 selects the power transmission point K1 as shown in the figure will be described. When the power transmission point K1 is selected, the switch 50 outputs the signal A from the ATC signal wave output unit 11.
The TC signal wave S1 is supplied to the superimposition point 58. At the superimposition point 58, the ATC signal wave S1 is superimposed on the above-mentioned TD signal wave S2, and becomes a superimposed wave S3. FIG. 2G shows a waveform diagram of the superimposed wave S3.

Then, the superimposed wave S3 is supplied to the amplifier 51. The amplifier 51 amplifies the supplied superimposed wave S3. The amplified superimposed wave S3 is supplied to the power transmission point K1 between the track circuits 1T and 2T. The supplied superimposed wave S3 is
It flows on the track circuit 1T from the power transmission point K1 in the direction a, and simultaneously flows on the track circuit 2T in the direction b from the power transmission point K1.

When the superimposed wave S3 flowing on the track circuit 1T reaches the transmission / reception point K0, the superimposed wave S3
Supplied to When the superimposed wave S3 is supplied, the coupler 53 outputs the ATC signal waves S1 and TD included in the superimposed wave S3.
Of the signal wave S2, only the TD signal wave S2 is passed and T
It is supplied to the D signal wave receiver 55. TD signal wave receiver 55
Is based on the supplied TD signal wave S2,
The presence or absence of the above vehicle is detected, and a vehicle presence detection signal D1 is output.

When the superimposed wave S3 flowing on the track circuit 2T reaches the transmission / reception point K2, the superposed wave S3
Supplied to When the superimposed wave S3 is supplied, the coupler 54 outputs the ATC signal waves S1 and TD included in the superimposed wave S3.
Of the signal wave S2, only the TD signal wave S2 is passed and T
It is supplied to the D signal wave receiver 56. TD signal wave receiver 56
Is based on the supplied TD signal wave S2,
The presence / absence of the above vehicle is detected, and a vehicle presence / absence detection signal D2 is output.

Next, the case where the switch 50 selects the power transmission / reception point K2 will be described. When the power transmission / reception point K2 is selected, the switch 50 supplies the ATC signal wave S1 to the amplifier 52.
The amplifier 52 amplifies the supplied ATC signal wave S1. The amplified ATC signal wave S1 is supplied to the transmission / reception point K2 between the track circuits 2T and 3T through the coupler 54.

The output TD signal wave S2 is
Supplied to Unlike the case where the switch 50 supplies the ATC signal wave S1 to the superposition point 58, the case where the ATC signal wave S1 is supplied to the amplifier 52 is not supplied to the superposition point 58. The TD signal wave S2 supplied to the superposition point 58 is supplied to the amplifier 51. The amplifier 51 amplifies the supplied TD signal wave S2. The amplified TD signal wave S2 is supplied to the power transmission point K1 between the track circuits 1T and 2T. The supplied TD signal wave S2 flows on the track circuit 1T from the power transmission point K1 in the direction a, and at the same time, the track circuit 2T in the direction b from the power transmission point K1, similarly to the above-described superimposed wave S3.
Flowing over. The presence or absence of a vehicle is detected by the TD signal wave S2 in the same manner as in the above-described superimposed wave S3, and the following description is omitted.

The above-described vehicle presence / absence detection signals D1 and D2 are supplied to a switch 50. The switch 50 detects the power transmission point K1 or the power transmission / reception point K2 based on the vehicle presence detection signals D1 and D2.
Select More specifically, the vehicle presence detection signal D
When the content of No. 1 is "there is a vehicle on the track circuit 1T", the switch 50 selects the power transmission point K1, and when the content of the vehicle presence detection signal D2 is "there is a vehicle on the track circuit 2T", the switch 5
0 selects the power transmission / reception point K2.

Next, the vehicle 4 traveling on the track 3 will be described. The vehicle 4 has an on-board antenna 41 and an ATC on-board device 42 mounted thereon. In FIG. 1, the vehicle 4 is on the track circuit 1T.

The on-vehicle antenna 41 is provided at a position near the track 3 in the vehicle 4 and has a receiving characteristic corresponding to the ATC signal wave S1. As described above, the superimposed wave S3 flows on the track circuit 1T. The on-vehicle antenna 41 receives only the ATC signal wave S1 among the ATC signal wave S1 and the TD signal wave S2 included in the superimposed wave S3. The received ATC signal wave S1 is supplied to the ATC on-board device 42. The ATC on-board device 42 performs a brake control based on the supplied ATC signal wave S1.

Next, the operation and effect of the ATC / TD ground apparatus 1 of the present invention will be described.

The ATC / TD terrestrial device 1 of the present invention comprises an AT
The C signal wave S1 and the TD signal wave S2 are output. The ATC signal wave S1 is a signal wave obtained by intermittently modulating the carrier wave S11. Similarly, the TD signal wave S2 is a signal wave obtained by intermittently modulating the carrier wave S21.

As described above, in the conventional ATC terrestrial equipment and TD terrestrial equipment, the ATC signal wave and the TD signal wave are outputted such that the durations of the carrier waves overlap with each other in time. For this reason, when the ATC signal wave and the TD signal wave are superimposed, the peak value (amplitude) of the superimposed wave becomes larger than the individual peak values (amplitude) of the ATC signal wave and the TD signal wave.

On the other hand, in the ATC / TD terrestrial equipment of the present invention, the ATC signal wave S1 and the TD signal wave S2 are different from each other in time T1 in which the carrier S11 lasts and time T2 in which the carrier S21 lasts. Is output at a timing that does not overlap with. Therefore, when the output ATC signal wave S1 and TD signal wave S2 are superimposed, the peak value (amplitude) p3 of the superimposed wave S3 becomes the peak value (amplitude) of the ATC signal wave S1.
p1 or the peak value (amplitude) p2 of the TD signal wave S2, and the peak value (amplitude) p3 of the superimposed wave S3
Can be reduced.

In the embodiment, the peak value (amplitude) p1 of the ATC signal wave S1 and the peak value (amplitude) p of the TD signal wave S2 are set.
2 are equal to each other, and the peak value (amplitude) p3 of the superimposed wave S3
Are the peak value (amplitude) p1 of the ATC signal wave S1 and TD
It is equal to both the peak value (amplitude) p2 of the signal wave S2.

Further, since the peak value (amplitude) p3 of the superimposed wave S3 decreases as described above, a small-capacity amplifier or coupler that handles the superimposed wave S3 can be used. Therefore, equipment costs can be reduced.

In the embodiment, a superimposed wave S3 obtained by superimposing the ATC signal wave S1 and the TD signal wave S2 is amplified by the amplifier 51. As the amplifier 51 that handles the superimposed wave S3, an amplifier having a small capacity can be used.

Unlike the embodiment, when the ATC signal wave and the TD signal wave are superimposed by a coupler to generate a superimposed wave, a small-capacity coupler for handling the superimposed wave can be used.

FIG. 3 is a diagram showing the configuration of the ATC / TD ground apparatus shown in FIG. 1 in detail. As described above, the ATC / TD ground device 1 according to the embodiment includes the ATC signal wave output unit 1.
1 and a TD signal wave output unit 12.

The ATC signal wave output section 11 has an ATC modulated wave output section 113, a signal source 111, and a modulator 112, and is supplied with signal indication information U1. Signal present information U1
Is supplied to the ATC modulated wave output unit 113. The ATC modulated wave output unit 113 is provided with a plurality of frequencies corresponding to the signal indication. The ATC modulated wave output unit 113 selects a frequency corresponding to the signal indication from a plurality of prepared frequencies. Then, the ATC modulated wave output unit 113 generates a trapezoidal wave of the selected frequency, and converts the trapezoidal wave to the ATC modulated wave S.
Output as 12.

The signal source 111 generates a carrier wave S11. The modulator 112 includes the ATC modulated wave output unit 113 described above.
Supplies an ATC modulated wave S12, and a signal source 111 supplies a carrier wave S11. Then, the modulator 112
The carrier wave S11 is intermittently modulated by the ATC modulation wave S12 to output an ATC signal wave S1.

As described above, the ATC signal wave output unit 11
Controls the TD signal wave output unit 12. As a specific control, the ATC signal wave output unit 11 supplies the TD modulation wave S22 to the TD signal wave output unit 12 by the phase inversion circuit 13. More specifically, the AT of the ATC signal wave output unit 11
The C modulation wave S12 is supplied to the phase inversion circuit 13. The phase inversion circuit 13 inverts the phase of the supplied ATC modulation wave S12 and outputs the same as a TD modulation wave S22. Therefore, the phase of the TD modulation wave S22 is opposite to the phase of the ATC modulation wave S12. Such a TD modulated wave S22 is
It is supplied to the TD signal wave output unit 12.

The TD signal wave output section 12 has a signal source 121
And a modulator 122. The signal source 121 generates a carrier wave S21. The modulator 112 is supplied with the TD modulation wave S22 from the above-described phase inversion circuit 13, and outputs the signal
Supplies a carrier wave S21. Then, the modulator 112
Outputs the TD signal wave S2 by intermittently modulating the carrier wave S21 with the TD modulation wave S22.

FIG. 4 is a diagram showing the configuration of the TD signal wave receiver in detail. FIG. 4 shows the configuration of the TD signal wave receiver 56. Two TD signal wave receivers 55 and 56
Have substantially the same configuration, the configuration of the TD signal wave receiver 56 will be representatively described below.

As shown, the TD signal wave receiver 56 includes:
Carrier wave filter 61, detector 62, signal processing unit 63
And a relay 64, and the TD signal wave S2 is supplied from the coupler 54 described above. The TD signal wave S2 is supplied to the carrier wave filter 61. The carrier wave filter 61 has a frequency band corresponding to the TD signal wave S2,
And supplied to the detector 62. The detector 62 performs envelope detection on the supplied TD signal wave S2 and performs TD modulation wave S2.
22 is output. The TD modulated wave S22 is transmitted to the signal processing unit 6
3 is supplied.

The signal processing section 63 has a plurality of modulated wave filters 71 to 7n, a plurality of modulated wave receiving circuits 81 to 8n, and a logic circuit 9. The TD modulated wave S22 from the above-described detector 62 is supplied to each of the modulated wave filters 71 to 7n. Each of the plurality of modulated wave filters 71 to 7n is set to a frequency corresponding to the signal representation, and passes a trapezoidal wave having a frequency set for itself.

The plurality of modulated wave receiving circuits 81 to 8n are provided corresponding to the plurality of modulated wave filters 71 to 7n, respectively. Each of the plurality of modulated wave receiving circuits 81 to 8n outputs a received signal when receiving the TD modulated wave S22, and stops outputting the received signal when not receiving the TD modulated wave S22.

The logic circuit 9 includes a plurality of modulated wave receiving circuits 81
When at least one of the modulated wave receiving circuits outputs a received signal, the relay 64 is de-energized. The non-excitation of the relay 64 corresponds to the vehicle presence / absence detection signal D2 indicating that "the vehicle is on the track circuit 2T".

Further, the logic circuit 9 excites the relay 64 when none of the plurality of modulated wave receiving circuits 81 to 8n outputs a received signal. Relay 64
Excitation corresponds to the vehicle presence / absence detection signal D2 of "no vehicle on track circuit 2T".

The signal processing unit 63 described above preferably
It is composed of a digital filter. The digital filter can easily process trapezoidal waves having different frequencies as the TD modulated wave S22. Signal processing unit 6 by digital filter
In the case of the configuration 3, the configuration of the signal processing unit 63 can be simplified, and the equipment cost and the maintenance cost of the TD signal wave receiver 56 can be reduced.

[0055]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide an ATC / TD ground apparatus capable of reducing the peak value of the superimposed wave of the ATC signal wave and the TD signal wave. (B) AT that can use a small-capacity amplifier or coupler for handling a superimposed wave of the ATC signal wave and the TD signal wave
A C / TD ground device can be provided. (C) It is possible to provide an ATC / TD ground device capable of reducing equipment costs.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of an ATC / TD ground device according to the present invention.

FIG. 2 is a diagram illustrating an operation of the ATC / TD ground device shown in FIG.

FIG. 3 is a diagram showing the configuration of the ATC / TD ground device shown in FIG. 1 in detail.

FIG. 4 is a diagram showing the configuration of a TD signal wave receiver in detail.

[Explanation of symbols]

 1 ATC / TD ground equipment according to the present invention S1 ATC signal wave S2 TD signal wave

Claims (1)

[Claims] 1. An automatic train control / train detection ground device that outputs an automatic train control signal wave and a train detection signal wave, wherein the automatic train control signal wave and the train detection signal wave are signals obtained by intermittently modulating a carrier wave. An automatic train control / train detection ground device that outputs waves at timings in which the durations of the carrier waves do not overlap with each other.