JP4976619B2 - Ground receiving device for insulated track circuit and train control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground receiving device for an insulated track circuit and a train control device.
[0002]
[Prior art]
Analog signals have been used for a long time as train control signals (hereinafter referred to as ATC signals) and train detection signals in insulated track circuits. Recently, however, digital signals have been used mainly due to the demand for multi-information ATC signals. It is being
[0003]
In the insulated track circuit system, when insulation degradation or dielectric breakdown occurs between track circuits, signal leakage (adjacent leakage) occurs in the adjacent track circuit. In the analog signal transmission method, it is necessary to deal with such adjacent leakage by using signals of different frequencies in adjacent track circuits. However, when digital signal transmission method is used, track circuit identification information is included in the telegram. Therefore, signals having the same frequency can be used between adjacent track circuits.
[0004]
However, when a digital signal is used and an adjacent leakage occurs, the message is destroyed. For this reason, in a general usage mode in which a digital signal is used not only as an ATC signal but also as a train detection signal, the train detection relay falls in the ground receiver constituting the train detection system, and the train is connected to the track circuit. There will be some false detection.
[0005]
When such a false detection occurs, train operation is prohibited in the track circuit where there is a train, so that the operation efficiency and the operation rate of the train are lowered. In order to avoid such a problem, it is necessary to monitor the insulation state between adjacent track circuits and detect it before the insulation deterioration or breakdown leading to the message breakdown. There is no known detection means.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a ground receiving device that can detect an insulation state between adjacent insulated track circuits and contribute to an improvement in train operation efficiency and availability, and a train control device including the ground receiving device. It is to be.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the ground receiving apparatus according to the present invention is used by being connected to an insulated track circuit, and two frequency signals are supported by the two codes from the insulated track circuit. And a function of detecting leakage between adjacent insulated track circuits from the code modulation signal.
[0008]
The ground receiving apparatus according to the present invention receives a code-modulated signal in which two frequency signals are associated with two types of codes. A typical example of a code modulation signal in which two frequency signals correspond to two types of codes is an FSK (Frequency Shift Keying) modulation signal or an MSK (Minimum Shift Keying) modulation signal. By using this code modulation method, not only a kind of information but also multiple information can be transmitted simultaneously as a digital signal. For example, not only the vehicle detection signal but also an ATC signal can be transmitted.
[0009]
The ground receiving apparatus according to the present invention receives a code modulation signal in which two frequency signals correspond to two kinds of codes from the insulated track circuit, and an adjacent insulated track from the input code modulation signal. It has a function of detecting leakage between circuits. Therefore, an insulation state between adjacent insulated track circuits can be detected, which can contribute to improvement in train operation efficiency and availability. More specifically, the fluctuation rate of the voltage level of the code modulation signal is calculated, and leakage is detected from the fluctuation rate.
[0010]
The ground receiving apparatus according to the present invention is combined with a ground transmitting apparatus to constitute a train control apparatus. A typical application of this train control device is vehicle detection. In addition, it can also be used as ATC signal transmission means based on multi-information transmission.
[0011]
Other features of the present invention and the functions and effects thereof will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a configuration of a train control device according to the present invention. The figure shows an example of a train control device that can be applied to vehicle detection. In the drawing, a track 1 configured as a pair of two is sequentially partitioned into a plurality of insulated track circuits 1T, 2T, and 3T by insulators 31 and 32. The train 2 travels on the track 1 in the direction indicated by the arrow a, and passes through the track circuits 1T, 2T, and 3T in this order.
[0013]
Next, paying attention to the track circuit 2T, the ground transmitter 61 is connected to the track circuit 2T in the vicinity of the insulator 32 located at the boundary with the track circuit 3T, and the ground receiver 62 is connected to the track circuit 1T. In the vicinity of the insulator 31 located at the boundary, the track circuit 2T is connected.
[0014]
The ground transmitter 61 transmits the code modulation signal S11 via the track circuit 2T. The code modulation signal S11 transmitted from the terrestrial transmitter 61 is a signal in which the frequency signals f1 and f2 are associated with two types of codes, and a digital code modulation signal such as an FSK modulation signal or an MSK modulation signal is widely used. it can. In the embodiment, for ease of explanation, a case where an FSK modulation signal is used will be described as an example.
[0015]
FIG. 2 is a diagram illustrating an example of FSK modulation. First, the encoded data signal of the message shown in FIG. 2A is code-modulated to a code modulation signal S11 shown in FIG. The electronic message includes, for example, track circuit identification information and ATC information.
[0016]
The illustrated code modulation signal S11 is a signal in which the frequency signals f1 and f2 are associated with two types of codes. Specifically, the frequency signal f1 is made to correspond to the logical value “0”, and the frequency signal f2 is made to correspond to the logical value “1”. The code modulation signal S11 is a temporal arrangement of the frequency signals f1 and f2 corresponding to the encoded data signal “10010110”. In this case, the frequency signals f1 and f2 are given by the following equations.
[0017]
f1 = fc−Δf
f2 = fc + Δf
However, fc is a carrier frequency and Δf is a shift frequency. As an example, when the carrier frequency fc is 1500 Hz and the shift frequency Δf is 16 Hz, the frequency signal f1 is 1484 Hz and the frequency signal f2 is 1516 Hz.
[0018]
Code modulation is performed not only on the track circuit 2T but also on the track circuits 1T and 3T using the same frequency signals f1 and f2. In the case of digital signal transmission, ID information for identifying a track circuit can be included in a message. Therefore, even if such a transmission method is adopted or a leak occurs between adjacent track circuits, safety is ensured. No problem.
[0019]
The ground receiving device 62 is connected to the track circuit 2T, and the code modulation signal S11 transmitted from the ground transmitting device 61 is input via the track circuit 2T. The ground receiving device 62 includes a leak detection unit 65. In the embodiment of FIG. 1, the ground receiving device 62 includes a train detection unit 63 and a data decoding unit 64 together with a leak detection unit 65.
[0020]
The train detection unit 63 receives the code modulation signal S11, and when the train 2 does not exist in the track circuit 2T, the train detection relay 63 is lifted, and when the train 2 enters, the train detection relay is dropped. Detect trains. Since the code modulation signal S11 includes ID information for identifying its own track circuit 2T, the train detection unit 63 determines whether or not the message is for itself based on the ID information. The presence or absence of the train 2 in the track circuit 2T to which can belong can be determined.
[0021]
The data decoding unit 64 decodes the contents of the electronic message included in the code modulation signal S11. Specifically, the code modulation signal S11 is decoded and decoded. As described above, since the code modulation signal S11 includes ID information for identifying the own track circuit 2T, the data decoding unit 64 provides the track circuit 2T to which it belongs based on the ID information. The received data can be decrypted.
[0022]
The leak detector 65 detects a leak of the code modulation signal between adjacent track circuits 2T-3T (or 2T-1T). Therefore, the insulation state of the insulator 31 or 32 between the adjacent track circuits 2T-1T or 2T-3T can be detected, which can contribute to the improvement of the operation efficiency and the operation rate of the train 2.
[0023]
If there is no adjacent leakage, the leakage detection unit 65 includes only the code modulation signal S11 directed to its own track circuit 2T. If adjacent leakage occurs, for example, the track circuit 3T together with the code modulation signal S11. The code-modulated signal S12 flowing through the signal is also included. That is, the combined signal (S11 + S12) is supplied to the leak detection unit 65.
[0024]
FIG. 3 is a diagram showing a case where insulation deterioration or dielectric breakdown occurs in the insulator 32 between the track circuit 2T and the track circuit 3T, and adjacent leakage occurs between the track circuit 2T and the track circuit 3T. Adjacent leakage occurs in both the track circuit 2T and the track circuit 3T. For simplicity of explanation, the adjacent leak from the track circuit 3T to the track circuit 2T will be described.
[0025]
FIG. 4 is a diagram showing a specific processing block or circuit block of the leak detection unit 65. The leak detection unit 65 in the illustrated embodiment includes a sampling unit 651 and a fluctuation rate detection unit 652. These may indicate the circuit or may simply indicate steps. When the leak detection unit 65 is configured by using a part of a computer, it belongs to the latter.
[0026]
The sampling unit 651 samples the voltage level of the combined signal (S11 + S12) for N seconds, obtains the maximum value Smax and the minimum value Smin in N seconds, and obtains the maximum value Smax and the minimum value Smin obtained within the sampling time N (seconds). From
Fluctuation rate ζ = (Smax-Smin) / Smax
The fluctuation rate ζ is calculated according to the relational expression. Then, leakage is detected from the magnitude of the fluctuation rate ζ.
[0027]
Next, the variation rate detection operation will be described in more detail with reference to FIGS. First, the leakage detection unit 65 includes a combined signal (S11 + S12) including the code modulation signal S11 of FIG. 5A transmitted via the track circuit 2T and the code modulation signal S12 leaking from the track circuit 3T. Is entered.
[0028]
When the code modulation signal S11 is decoded, an encoded data signal shown in FIG. 5B is obtained. This encoded data signal matches the encoded data signal shown in FIG.
[0029]
FIG. 5C shows the code modulation signal S12 leaked from the track circuit 3T to the track circuit 2T, and FIG. 5D shows a leak encoded data signal obtained by decoding the code modulation signal S12.
[0030]
In the present invention, since not only the track circuit 2T but also the track circuits 1T and 3T perform code modulation using the same frequency signals f1 and f2, the code modulation signal S12 leaked from the track circuit 3T to the track circuit 2T is also obtained. The signal is code-modulated with the frequency signals f1 and f2.
[0031]
There is a time axis between the encoded data signal of the track circuit 2T (FIG. 5B) and the leaked encoded data signal (FIG. 5D) obtained by decoding the code modulation signal S12 leaked from the track circuit 3T. , There are combinations of H level and H level (HH), H level and L level (HL), and L level and L level (LL). Therefore, the variation rate detection operation will be described for each combination (HH), (LL), and (HL).
[0032]
First, in the case corresponding to the combination (HL), as described above, the H level corresponds to the frequency signal f2, and the L level corresponds to the frequency signal f1. Accordingly, in the case of detecting leakage by sampling the composite signal (S11 + S12), if the sampling timing corresponds to the combination (HL), the sampled signal includes two frequency signals f1 and f2. Therefore, the size of the reception level is doubled. Accordingly, the fluctuation rate detection unit 652 can detect a large fluctuation rate ζ, and thus can detect a leak.
[0033]
Next, when the temporal timing of sampling corresponds to the combination (HH) or (LL), the sampling value includes only a single wave of the frequency signal f1 or f2. For example, in the case of the combination (LL), the frequency signal f1 leaked from the track circuit 3T overlaps the frequency signal f1 of the track circuit 2T. In this case, the phase of the frequency signal f1 of the track circuit 2T and the frequency signal f1 leaked from the track circuit 3T are different. In the case of the combination (HH), the frequency signal f2 leaked from the track circuit 3T is superimposed on the frequency signal f2 of the track circuit 2T.
[0034]
When two waves have the same frequency f and a phase difference δ, a combined wave F obtained by superimposing these two waves is
F = sin (2πft) + sin (2πft + δ)
＝ 2sin (2πft + δ / 2) ・ cos (ー δ / 2)
= 2cos (δ / 2) ・ sin (2πft + δ / 2) (1)
It becomes. Also, the magnitude | F | is | 2 cos (δ / 2) | times as large as a single wave having the frequency f.
[0035]
FIG. 6 is a graph showing Equation (1). In FIG. 6, the horizontal axis indicates the phase difference δ (× π), and the vertical axis indicates the magnitude (absolute value) of the combined wave F with respect to the single wave f.
[0036]
As shown in FIG. 6, in the case of superposition of two waves, the magnitude of the combined wave F changes according to a sine wave corresponding to the change of the phase difference δ.
[0037]
Therefore, also in the case of the combination (LL) or (HH), leakage can be detected by detecting the fluctuation rate ζ of the synthesized wave F of the frequency signal f1 or f2.
[0038]
Actually, there is no adjacent leakage, adjacent leakage ranks 1, 2, 3,. . By ranking as described above, the degree of insulation deterioration can be determined, and the insulators 31 and 32 can be exchanged at a relatively light insulation deterioration stage before the message breakdown occurs.
[0039]
【Effect of the invention】
As described above, according to the present invention, an insulation state between adjacent insulated track circuits is detected, and a ground receiving device that can contribute to an improvement in operation efficiency and availability of a train, and the ground receiving device are included. A train control device can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a train control device according to the present invention.
FIG. 2 is a diagram illustrating an example of FSK modulation.
FIG. 3 is a diagram showing a case where adjacent leakage occurs between adjacent track circuits.
FIG. 4 is a diagram illustrating a specific processing block or circuit block of a leak detection unit.
FIG. 5 is a diagram for explaining an adjacent leakage detection operation in the ground receiving apparatus according to the present invention.
FIG. 6 is a graph showing the relationship between a composite wave obtained by superimposing two waves and a phase difference.
[Explanation of symbols]
61 Ground transmitter 62 Ground receiver S11, S12 Code modulation signal f1, f2 Frequency signal

Claims (2)

A terrestrial receiver used in connection with an insulated track circuit,
From the insulated track circuit, two different frequency signals are made to correspond to two kinds of codes, and a code modulation signal including a message composed of a combination of the two kinds of codes is inputted,
The message includes ID information for identifying the track circuit,
From the synthesized signal of the two different frequency signals constituting the code modulation signal and the two different frequency signals constituting the code modulation signal leaked from the adjacent insulated track circuit, between the adjacent insulated track circuits It has a function to detect leaks,
The voltage level of the synthesized signal is sampled for a predetermined time, and the fluctuation rate is calculated from the maximum value and the minimum value obtained within the sampling time according to the relational expression of fluctuation rate = (maximum value−minimum value) / maximum value The leakage between adjacent insulated track circuits is detected from the magnitude of the fluctuation rate.
Ground receiver. A train control device that includes a ground transmitter and a ground receiver, and is used by being connected to an insulated track circuit,
The ground receiving device is the one described in claim 1,
The terrestrial transmission device associates two different frequency signals with two types of codes, and supplies a code modulation signal including a telegram composed of a combination of the two types of codes to the insulated track circuit,
The message includes ID information for identifying the track circuit,
Train control device.

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