JP6653589B2 - Axle detection system - Google Patents

Description

  The present invention relates to an axle detection system, for example, an axle detection system that detects a wheel on a track using a transmission coil and a reception coil.

  As a device for detecting the passage or position of a train in a railway, a track circuit method for determining whether a track circuit is in a closed state or an axle counter method for detecting the presence or absence of wheels using a transmission coil and a reception coil is used. Are known.

  The axle counter system technology is a technology for detecting an axle (wheel) using an electromagnetic shielding effect using an axle sensor (transmitting coil and receiving coil), and various technologies have been proposed (for example, Patent Document 1). reference).

  With reference to FIGS. 1 and 2, a general axle counter type technique will be described. FIG. 1 is a conceptual diagram of an axle detection system 110 using two detectors 111 and 112. The two detectors 111 and 112 are arranged close to each other along the track 199. FIG. 2 is a block diagram showing a configuration of one detector 111. The other detector 112 has the same configuration.

  In each of the detectors 111 and 112, transmission coils 121 and 151 and reception coils 122 and 152 are arranged with a track 199 interposed therebetween. For example, sine wave signals having predetermined first and second frequencies f1 and f2 in the audio band flow through the transmission coils 121 and 151 outside the orbit. The receiving coils 122 and 152 inside the orbit receive signals from the transmitting coils 121 and 151. FIG. 3 is a diagram showing the relationship between the position of the wheel 190 and the signal amplitude (voltage) of the receiving coil 122. FIG. 3A shows the positional relationship between the wheel 190 and the receiving coil 122, and FIG. 3B shows the relationship with the signal amplitude at that time.

  First, an operation example of one set of the detector 111 (the transmission coil 121 and the reception coil 122) will be described. When there is no wheel 190 (axle 195), a signal of a predetermined amplitude flows between the transmission coil 121, the rail 199, and the reception coil 122 by electromagnetic induction. When the wheel 190 (axle 195) passes between the coils, the line of magnetic force is affected by the passage, and the magnitude (voltage) of the received signal changes. This change is received by the receiving circuit 132 and amplified, and the wheel detector 133 determines whether or not the wheel 190 (axle 195) is present.

  Next, the moving direction determination using the two sets of detectors 111 and 112 will be described. Since the two sets of detectors 111 and 112 having independent circuit configurations are set apart by about several tens of cm, the direction can be determined. Generally, transmission signals of different first and second frequencies f1 and f2 are used to avoid mutual interference.

  On the other hand, in order to check the soundness of the detector 111 (the other detector 112 is also the same), the soundness checking unit 134 monitors the amplitude of the received signal, and if the amplitude is within a certain range, the transmitting circuit 131 and the transmitting cable 123 are checked. It is determined that the operations of the transmission coil 121, the reception coil 122, the reception cable 124, and the reception circuit 132 are normal.

JP 2007-263938 A

  Incidentally, when the wheel 190 passes through the positions of the detectors 111 and 112, the amplitude changes as shown in FIG. Then, for example, at positions A and B separated by a predetermined distance, the amplitude becomes very small. When the wheels 190 stop at these positions A and B, there is a problem that even if there is no failure or the like, a failure is determined under conditions for checking soundness.

  The present invention has been made in view of such circumstances, and has as its object to provide a technique for solving the above-described problems.

The present invention has a first detector having a first transmitting coil and a first receiving coil for outputting a signal of a first frequency, and a second transmitting coil and a second receiving coil for outputting a signal of a second frequency. An axle detection system in which a second detector and a second detector are arranged at a predetermined distance from each other in a traveling direction of a rail, wherein the first detector acquires a signal of the first frequency from a signal received by the first receiving coil. A first first frequency signal soundness checking unit for checking soundness, and a first second frequency signal for obtaining a signal of the second frequency from a signal received by the first receiving coil and checking soundness. A second sound detector for obtaining a signal of the first frequency from a signal received by the second receiving coil and checking the soundness of the second frequency signal. Checking unit and whether the signal is received by the second receiving coil And a second second frequency signal integrity Shosa unit for Shosa signals acquired soundness of the second frequency.
In addition, the first detector includes a first frequency signal integrity checker, a first second frequency signal integrity checker, and a second first frequency signal integrity checker. A first judging unit for judging soundness based on a check result, wherein the second detector includes the first second frequency signal soundness checking unit and the second first frequency signal soundness checking unit And a second determination unit that determines soundness based on each check result of the second second frequency signal soundness check unit.
In addition, the first first frequency signal integrity checker, the first second frequency signal integrity checker, the second first frequency signal integrity checker, and the second second frequency signal A failure determination table describing the relationship between the inspection of the soundness checking unit and the failure location, the failure judgment table, the first first frequency signal soundness checking unit, and the first second frequency signal soundness checking Unit, the second first frequency signal soundness checking unit, and a check result of the second second frequency signal soundness checking unit, and a transmission system or a reception system of the first detector, or A failure point identification unit that determines whether a failure has occurred in either the transmission system or the reception system of the second detector may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the accuracy of the soundness check of the wheel detector using a transmission coil and a reception coil can be implement | achieved.

FIG. 1 is a conceptual diagram of an axle detection system using two detectors according to the background art. It is a block diagram showing the composition of a detector concerning background art. It is the figure which showed the relationship between the position of a wheel and the signal amplitude of a receiving coil concerning background art. It is a key map of an axle detection system concerning this embodiment. FIG. 4 is a diagram illustrating a relationship between a position of a wheel and a signal amplitude of a receiving coil according to the embodiment. It is a functional block diagram of an axle detection system concerning this embodiment. FIG. 4 is a diagram illustrating a failure determination logic table according to the embodiment.

  Next, embodiments for implementing the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

  FIG. 4 is an image diagram of a train direction discriminating rail installation by axle detection of the axle detection system 10. The axle detection system 10 includes two sets of detectors (the first detector 11 and the second detector 12) arranged at a predetermined distance in the longitudinal direction of the track 99 (rail), and a monitoring unit 85. The distance between the first detector 11 and the second detector 12 is, for example, about several tens of cm. The detection results of the first detector 11 and the second detector 12 are notified to the monitoring unit 85. The monitoring unit 85 manages train operation and the like based on the detection result. The basic operation principle of the first detector 11 and the second detector 12 is the same as the operation principle shown in FIG.

  The first detector 11 includes the first transmission coil 21 outside the track 99, the first reception coil 22 inside the track 99, and the track 99 therebetween. Similarly, the second detector 12 includes the second transmission coil 51 outside the track 99 and the second reception coil 52 inside the track 99 so as to sandwich the track 99.

  A sine wave signal having the first frequency f1 flows through the first transmission coil 21. A sine wave signal having a second frequency f2 different from the first frequency f1 flows through the second transmission coil 51. The first frequency f1 and the second frequency f2 are set to frequencies that can be appropriately separated by band-pass filters (BPFs 34, 35, 64, and 65 (see FIG. 6)) described later.

  The first receiving coil 22 receives a signal from the first transmitting coil 21. The second receiving coil 52 receives a signal from the second transmitting coil 51.

  FIG. 5 is a diagram showing the relationship between the position of the axle 95 (wheels 90) and the amplitude of each signal. Generally, the first receiving coil 22 receives not only the signal (first frequency f1) from the first transmitting coil 21 but also the signal (second frequency f2) from the second transmitting coil 51. Similarly, the second reception coil 52 receives not only the signal (second frequency f2) from the second transmission coil 51 but also the signal (first frequency f1) from the first transmission coil 21.

  When the wheel 90 stops at the point where the reception amplitude of the first detector 11 becomes 0, here, it is assumed that the wheel 90 stops at the point A or the point B in the drawing. At this time, the signal (second frequency f2) of the second detector 12 can be received by the first receiving coil 22 of the first detector 11.

  Further, the position where the amplitude becomes 0 differs depending on the positional relationship between the first transmitting coil 21 and the first receiving coil 22 and the positional relationship between the second transmitting coil 51 and the second receiving coil 52. Therefore, even when the wheel 90 stops at the points A and B in the figure, the signal (the second frequency f2) of the second detector 12 detected by the first receiving coil 22 has a constant amplitude. If it is checked that the amplitude is equal to or more than a certain value, the soundness of the first receiving coil 22, the receiving cable 24 and the first receiving circuit 32 of the first detector 11 is determined by the magnitude of the signal of the second frequency f2. Can be detected.

  Furthermore, the signal (first frequency f1) transmitted by the first detector 11 at the position of the wheel 90 can be received by the second receiving coil 52 of the second detector 12. By monitoring this signal in the same manner as described above, the soundness of the first transmission coil 21, the transmission cable 23, and the first transmission circuit 31 of the first detector 11 can be confirmed.

  The signal (second frequency f2) of the second detector 12 detected by the first detector 11 also has a wheel position at which the amplitude becomes 0 with the movement of the wheel 90. However, at this time, since the original signal (the first frequency f1) can be received, that is, the amplitude is not 0, the soundness is checked using the signal (the first frequency f1).

  As for the second detector 12, the same soundness can be confirmed by monitoring the signal (first frequency f1) from the first detector 11 together. That is, by monitoring the signals of the first detector 11 and the second detector 12 with each other, the soundness can be confirmed regardless of the position of the wheel 90.

  FIG. 6 is a functional block diagram of the axle detection system of the axle detection system 10, and shows a specific configuration concept incorporating the above-described functions.

  The axle detection system 10 includes the first detector 11, the second detector 12, and the monitoring unit 85 as described above.

  The first detector 11 includes a first transmission circuit 31 and a first transmission coil 21 for transmitting a signal of the first frequency f1. The first transmission coil 21 and the first transmission circuit 31 are connected by a transmission cable 23.

  The first receiving coil 22 and the first receiving circuit 32 are provided to receive the signal of the first frequency f1. As described above, the first receiving coil 22 and the first receiving circuit 32 also receive the signal of the second frequency f2 output from the adjacent second detector 12. The first receiving coil 22 and the first receiving circuit 32 are connected by the receiving cable 24.

  The signal received by the first receiving circuit 32 is sent to the first wheel detection unit 33, the first f1 soundness checking unit 41, and the first f2 soundness checking unit 42. The first wheel detection unit 33 determines whether the wheel 90 is present.

  The first f1 soundness checking unit 41 acquires a signal of the first frequency f1 via the BPF 34 provided at the preceding stage, and checks soundness based on the signal. The result of the check, that is, whether or not the reception level of the signal of the first frequency f1 is normal is output to the first logic unit 49.

  The first f2 soundness checking unit 42 acquires a signal of the second frequency f2 via the BPF 35 provided at the preceding stage, and checks soundness based on the signal. The result of the check, that is, whether or not the reception level of the signal of the second frequency f2 is normal is output to the first logic unit 49 and is also output to the second logic unit 79 of the second detector 12 described later. You.

  The first logic unit 49 receives the check result of the first f1 soundness check unit 41, the check result of the first f2 soundness check unit 42, and the second logical unit 79 (the second f1 soundness check unit 71) of the second detector 12. The soundness of the first detector 11 is determined based on the output check result. The determination result is notified to the monitoring unit 85. Here, the check result is “1” for normal and “0” for abnormal.

  The first logic unit 49 includes an OR gate 43, an INV gate 44, and two AND gates 45 and 46.

The result of the check from the first f1 soundness check unit 41 is output to the OR gate 43, the logic is inverted via the INV gate 44, and output to the AND gate 46 on the downstream side.
Is output to

  The check result from the first f2 soundness check unit 42 and the check result from the second f1 soundness check unit 71 of the second detector 12 are taken into the AND gate 45 on the upstream side. The logical result of the upstream AND gate 45 is output to the downstream AND gate 46. That is, only when both check results are normal, that is, “1”, “1” indicating normal is output to the AND gate 46, and “0” is output for the other.

  The downstream AND gate 46 sends the signal to the OR gate 43 only when both the output of the upstream AND gate 45 and the output of the first f1 soundness checking unit 41 (logical inversion by the INV gate 44) are “1”. "1" is output.

  If the output from the first f1 soundness checking unit 41 or the output from the downstream AND gate 46 is “1”, the OR gate 43 sends “1” to the monitoring unit 85, that is, the first detector. 11 is normal.

  The second detector 12 includes a second transmitting coil 51 and a second transmitting circuit 61 for transmitting a signal of the second frequency f2. The second transmission coil 51 and the second transmission circuit 61 are connected by a transmission cable 53.

  A second receiving coil 52 and a second receiving circuit 62 are provided for receiving a signal of the second frequency f2. As described above, the second receiving coil 52 and the second receiving circuit 62 also receive the signal of the first frequency f1 output from the adjacent first detector 11. The second receiving coil 52 and the second receiving circuit 62 are connected by a receiving cable 54.

  The signal received by the second receiving circuit 62 is sent to the second wheel detection unit 63, the second f1 soundness checking unit 71, and the second f2 soundness checking unit 72. The second wheel detector 63 determines whether the wheel 90 is present.

  The second f1 soundness checking unit 71 acquires a signal of the first frequency f1 via the BPF 64 provided at the preceding stage, and checks soundness based on the signal. The result of the check, that is, whether or not the reception level of the signal of the first frequency f1 is normal is output to the second logic unit 79, and the first logic unit 49 of the first detector 11 (AND on the upstream side) Output to the gate 45).

  The second f2 soundness checking unit 72 acquires a signal of the second frequency f2 via the BPF 65 provided at the preceding stage, and checks soundness based on the signal. The result of the check, that is, whether or not the reception level of the signal of the second frequency f2 is normal is output to the second logic unit 79.

  The second logic unit 79 receives the check result of the second f1 soundness check unit 71, the check result of the second f2 soundness check unit 72, and the first logic unit 49 of the first detector 11 (the first f2 soundness check unit 42). The soundness of the second detector 12 is determined based on the output check result. The determination result is notified to the monitoring unit 85.

  The second logic unit 79 includes an OR gate 73, an INV gate 74, and two AND gates 75 and 76.

  The result of the check from the second f2 soundness check unit 72 is output to the OR gate 73, the logic is inverted via the INV gate 74, and the result is output to the AND gate 76 on the downstream side.

  The check result from the second f1 soundness check unit 71 and the check result from the first f2 soundness check unit 42 of the first detector 11 are taken into the AND gate 75 on the upstream side. The logical result of the upstream AND gate 75 is output to the downstream AND gate 76. That is, only when both check results are normal, that is, "1", "1" indicating normal is output to the AND gate 76, and "0" is output for the other.

  The downstream AND gate 76 is sent to the OR gate 73 only when both the output of the upstream AND gate 75 and the output of the second f2 soundness checking unit 72 (logical inversion by the INV gate 74) are “1”. "1" is output, otherwise "0" is output.

  The OR gate 73 sends “1” to the monitoring unit 85 if either the output from the second f2 soundness checking unit 72 or the output from the downstream AND gate 76 is “1”, that is, the second detector. 12 is normal.

  As described above, according to the present embodiment, soundness can be confirmed regardless of the position of the wheel 90 by monitoring signals of two sets of detectors (the first detector 11 and the second detector 12).

  By the way, in the configuration of FIG. 6, it is determined whether the first detector 11 has failed or the second detector 12 has failed, and outputs the result. However, the signals of the first detector 11 and the second detector 12 are monitored by the first detector 11 and the second detector 12 with each other, and as described with reference to FIG. 5, it is determined that the failure has occurred. In this case, it is possible to determine whether the failure is in the transmission system or the reception system.

  FIG. 7 is a diagram showing a failure determination logic table (failure determination table), and shows logic for determining whether a failure has occurred in the transmission system or the reception system. When making a determination using this failure determination logic table, the determination is made by looking at the outputs of the first f1 soundness checking unit 41, the first f2 soundness checking unit 42, the second f1 soundness checking unit 71, and the second f2 soundness checking unit 72. I do. Therefore, in that case, the first logic unit 49 and the second logic unit 79 become unnecessary, and instead, for example, the monitoring unit 85 executes the failure location specifying function after holding the failure determination logic table. In other words, the monitoring unit 85 compares the outputs of the first f1 soundness checking unit 41, the first f2 soundness checking unit 42, the second f1 soundness checking unit 71, and the second f2 soundness checking unit 72 with the failure determination logic table. Then, the presence or absence of a failure is determined.

  Here, the first detector transmission system refers to the first transmission coil 21, the first transmission circuit 31, and the transmission cable 23 connecting them. The first detector receiving system refers to the first receiving coil 22, the first receiving circuit 32, and the receiving cable 24 connecting them. The second detector transmission system refers to the second transmission coil 51, the second transmission circuit 61, and the transmission cable 53 connecting them. The second detector receiving system refers to the second receiving coil 52, the second receiving circuit 62, and the receiving cable 54 connecting them.

  In the failure determination logic table, specific failure locations in the lower row are indicated by “X” corresponding to the two items indicated by “Y” in the lower reception level column in the upper row. For example, the f1 reception level of the first detector 11 decreases (logic “0” in the first f1 soundness checking unit 41) and the f1 reception level of the second detector 12 decreases (logic “0” in the second f1 soundness checking unit 71). In the case of ()), it is determined that the first detector transmission system has failed. Also, the f2 reception level of the first detector 11 decreases (logic "0" in the first f2 soundness checking unit 42) and the f2 reception level of the second detector 12 decreases (logic "0" in the second f2 soundness checking unit 72). In the case of ()), it is determined that the transmission system of the second detector 12 is out of order.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of the components, and that such modifications are also within the scope of the present invention.

Reference Signs List 10 axle detection system 11 first detector 12 second detector 21 first transmission coil 22 first reception coil 23 transmission cable 24 reception cable 31 first transmission circuit 32 first reception circuit 33 first wheel detector 34, 35 BPF
41 1f1 soundness checking unit 42 1f2 soundness checking unit 43 OR gate 44 INV gates 45 and 46 AND gate 49 First logic unit (first judgment unit)
51 second transmission coil 52 second reception coil 53 transmission cable 54 reception cable 61 second transmission circuit 62 second reception circuit 63 second wheel detector 64, 65 BPF
71 2f1 soundness checking unit 72 2f2 soundness checking unit 73 OR gate 74 INV gates 75 and 76 AND gate 79 second logic unit (second judgment unit)
85 monitoring unit 90 wheels 95 axle 99 orbit

Claims (3)

A first detector having a first transmitting coil and a first receiving coil for outputting a signal of a first frequency, and a second detector having a second transmitting coil and a second receiving coil for outputting a signal of a second frequency And an axle detection system arranged with a predetermined distance in the traveling direction of the rail,
The first detector includes:
A first first frequency signal soundness checking unit that obtains the signal of the first frequency from the signal received by the first receiving coil and checks the soundness;
A first second frequency signal soundness checking unit that obtains a signal of the second frequency from a signal received by the first receiving coil and checks soundness;
Has,
The second detector,
A second first frequency signal soundness checking unit that obtains the signal of the first frequency from the signal received by the second receiving coil and checks the soundness;
A second second frequency signal soundness checking unit that obtains the signal of the second frequency from the signal received by the second receiving coil and checks the soundness;
An axle detection system comprising: The first detector includes a check result of each of the first first frequency signal soundness checking unit, the first second frequency signal soundness checking unit, and the second first frequency signal soundness checking unit. A first determination unit that determines soundness based on the
The second detector includes a check result of each of the first second frequency signal soundness checking unit, the second first frequency signal soundness checking unit, and the second second frequency signal soundness checking unit. The axle detection system according to claim 1, further comprising a second determination unit that determines soundness based on the axle. The first first frequency signal integrity checker, the first second frequency signal integrity checker, the second first frequency signal integrity checker, and the second second frequency signal integrity checker A failure determination table describing the relationship between the review by the review unit and the failure location;
The failure determination table, the first first frequency signal integrity checker, the first second frequency signal integrity checker, the second first frequency signal integrity checker, and the second With reference to the inspection result of the second frequency signal soundness inspection unit, it is determined whether a failure has occurred in the transmission system or the reception system of the first detector or the transmission system or the reception system of the second detector. The axle detection system according to claim 1, further comprising: a failure point identification unit that determines whether the axle is defective.

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