JP6947593B2 - Train control system - Google Patents

Description

The present invention relates to a train control system that controls a train by discriminating between the presence / absence of a train and the type of on-board device by a train detection signal.

In the new transportation system, since the train is driven by rubber tires, train detection by the axle short-circuit method such as the track circuit by rail cannot be performed. Therefore, in general, a train detection signal (hereinafter, abbreviated as TD signal) is transmitted from the on-board device to the loop coil on the ground via an antenna, and the presence or absence of this TD signal is detected by the ground device, and this is applicable. The presence / absence of a train on a loop coil (track) is detected (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-13043

By the way, when the ground equipment is updated to a new signal system, the equipment mounted on a large number of vehicles must be replaced, so that the old and new on-board equipment may coexist in the transitional period. Therefore, in Patent Document 1, the existing on-board device (old signal-compatible on-board device) and the new on-board device are used by changing the phase of the carrier wave of the TD signal transmitted from the on-board device depending on the type of the on-board device. (New signal compatible on-board device) is identified.

However, in the technique proposed in Patent Document 1, when information is received on the ground device side, a complicated circuit for detecting the phase of the carrier wave is required in addition to the circuit for receiving and demodulating the TD signal. .. In addition, since it is necessary to obtain a sufficient level ratio (S / N ratio) between the TD signal and the noise entering the same frequency band as the TD signal, the output of the TD signal transmitted from the on-board device must be increased. There is a problem that it must be done.

The present invention has been made in view of the above circumstances, and an object of the present invention is to be on a vehicle without providing a complicated circuit having a different demodulation method or increasing the output of a train detection signal. The purpose is to provide a train control system capable of discriminating the type of device.

The train control system according to one aspect of the present invention transmits a train detection signal modulated from the on-board device to a loop coil installed on the ground, and demotes the train detection signal received by the ground device via the loop coil. It is a system that detects the presence / absence of a train and controls the train. The mark space ratio of the train detection signal transmitted from the on-board device is changed according to the type of the on-board device and received by the ground device. It is characterized in that the type of on- board device is determined based on a component other than the primary component among the harmonic components of the train detection signal.

According to the present invention, since the type of the on-board device is determined based on the difference in the harmonic components of the train detection signal, a complicated circuit having a different demodulation method may be provided or the output of the train detection signal may be increased. The type of on-board device can be determined without any problem.

It is a functional block diagram which shows the schematic structure of the train control system which concerns on embodiment of this invention. It is a functional block diagram which shows the structural example of the TD signal receiving apparatus shown in FIG. It is a waveform diagram which shows the example of the MS ratio of the TD signal in the vehicle-mounted device corresponding to the old signal and the on-board device corresponding to the new signal. It is a figure which shows the spectrum of the TD signal in the vehicle-mounted device corresponding to the old signal. It is a figure which shows the spectrum of the TD signal in the on-board device corresponding to a new signal. It is a flowchart for demonstrating the detection operation of the presence / absence of a train in the train control system shown in FIG. 1 and FIG. 2 and the operation of discriminating the type of an on-board device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration example of a train control system according to an embodiment of the present invention. This system transmits a TD signal modulated from the on-board device 1 to a loop coil LC installed on the ground, demodulates the TD signal received by the ground device 2 via the loop coil LC, and is on / off the train. It detects the current line and controls the train, so-called ATC / TD (Automatic Train Control / Train Detection).

The on-board device 1 mounted on the train is provided with a TD signal transmitting device 3 and an ATC signal receiving device 4, and the ground device 2 is provided with a TD signal receiving device 5 and an ATC signal receiving device 6. .. The TD signal transmission device 3 generates a TD signal and transmits it to the loop coil LC on the ground via the antenna 17, and has a carrier wave generator 7, a modulation unit 8, an amplifier (AMP) 9, and a modulation wave setting unit 10. , And a TD signal filter 16 and the like. In this example, the modulated wave setting unit 10 includes a modulated wave having a mark space ratio (MS ratio) of "1: 1" for the new signal compatible on-board device (or new vehicle) and an old signal compatible on-board device (or new vehicle). A modulated wave with an MS ratio of "3: 1" is set for the existing vehicle). Then, the carrier wave generated by the carrier wave generation unit 7 is amplitude-modulated by the modulation unit 8 with the modulation wave set in the modulation wave setting unit 10, a TD signal is generated, amplified by the amplifier 9, and then a TD signal filter. (Band path filter) It is designed to output via 16.

The TD signal receiving device 5 identifies the TD signal from the modulated wave detection unit 11 that detects the modulated wave in order to demolish the TD signal received from the loop coil LC and the modulated wave detected by the modulated wave detection unit 11. Train detection output indicating the presence of the train, train non-detection output indicating the absence of the train, and whether the existing on-board device (old signal compatible on-board device) or new on-board device (new signal compatible on-board device) It includes a TD signal identification unit 12 that outputs the old and new signal switching output signals shown. The ATC signal transmitting device 6 transmits a train control signal (ATC signal) corresponding to the type of the on-board device 1 (whether it is a new signal-compatible on-board device or an old signal-compatible on-board device) received by the TD signal receiving device 5. , Is transmitted to the on-board device 1 via the loop coil LC. The ATC signal transmitter 6 is output from the new ATC signal transmitter 13 that outputs the ATC signal corresponding to the new signal, the old ATC signal transmitter 14 that outputs the ATC signal corresponding to the old signal, and these transmitters 13 and 14. The old and new ATC signal transmission switching unit 15 for switching the ATC signal based on the old and new signal switching output signal output from the TD signal identification unit 12 is included. Then, the ATC signal output from the new ATC signal transmitter 13 or the old ATC signal transmitter 14 selected by the old and new ATC signal transmission switching unit 15 is the ATC signal filter (bandpass filter) 18 of the on-board device 1. The train is controlled by being supplied to the ATC signal receiving device 4 via the above.

FIG. 2 is a functional block diagram showing a configuration example of the TD signal receiving device 5 in FIG. The modulated wave detection unit 11 extracts the modulated wave component from the amplitude modulated wave, and is the primary component of the detector 20 and the TD signal (in this example, the amplitude modulated wave, here referred to as the TD modulated wave). A train detection filter 25 that passes through the above and a type discrimination filter 26 that passes through the secondary component of the TD modulated wave are provided. Further, the TD signal identification unit 12 includes a modulated wave identification unit 22 and a TD signal detection unit 23, and the modulated wave identification unit 22 includes a train detection level detector 27 and a type discrimination level detector 28. I'm out. Then, the level of the primary component in the TD modulated wave that has passed through the train detection filter 25 is detected by the train detection level detector 27. Further, the level of the secondary component in the TD modulated wave that has passed through the type discrimination filter 26 is detected by the type discrimination level detector 28.

The TD signal detection unit 23 includes a train detection signal threshold value determination unit 29 and a type determination signal threshold value determination unit 30. When the train detection signal threshold determination unit 29 determines that the primary component of the TD modulated wave is equal to or higher than the train detection threshold, the train detection output is input to the ground device 2 to recognize the presence of the train and detect the train. If it is determined that the value is less than the threshold value, a train non-detection output indicating that the train is absent is supplied to the old / new ATC signal transmission switching unit 15. As the signal to be sent to the old and new ATC signal transmission switching unit 15, it is preferable to determine in advance what kind of signal will be sent when the train is absent, and to transmit the signal. Further, when the type discrimination signal threshold value discrimination unit 30 determines that the secondary component of the TD modulated wave is equal to or higher than the type discrimination threshold value, the new type determination output is sent to the old / new ATC signal transmission switching unit 15 as the old / new signal switching output signal. When it is supplied and it is determined that it is less than the type discrimination threshold value, the old model determination output is supplied to the old / new ATC signal transmission switching unit 15 as the old / new signal switching output signal.

FIG. 3 is a waveform diagram showing an example of the MS ratio of each TD signal in the existing on-board device (old signal-compatible on-board device) and the new on-board device (new signal-compatible on-board device). In this example, the MS ratio of the existing on-board device is set to "3: 1" as shown in (a), and the MS ratio of the newly installed on-board device is set to "1: 1" as shown in (b). It is set to "1".
In the existing on-board equipment, the TD signal is an amplitude-modulated wave with an MS ratio of "3: 1", because the ground equipment that detects the train uses a suppression method (M is large). Because it is more advantageous for the suppressive action). At present, it is a non-suppressive method, and it is not necessary to increase M. Therefore, the MS ratio is set to "1: 1" as the TD signal of the newly installed on-board device.
However, the MS ratios of "3: 1" and "1: 1" are examples in consideration of the current system, and the on-board device 1 is based on the difference in the harmonic components of the TD signal received by the ground device 2. It is not limited to these ratios as long as it is possible to determine the type of.

FIG. 4 shows the spectrum of the modulated wave having the MS ratio of “3: 1”, which corresponds to the spectrum of the TD signal in the old signal compatible on-board device. Further, FIG. 5 shows the spectrum of the modulated wave having the MS ratio of “1: 1”, which corresponds to the spectrum of the TD signal in the new signal compatible on-board device. In order to detect a train, the primary component of the modulated wave of the TD signal is detected. Therefore, even if the MS ratio changes, there is no difference in the train detection function.

On the other hand, when the MS ratio is "1: 1", only odd-numbered components of the modulated wave are generated such as 1st, 3rd, 5th, 7th, 9th, and so on, and the MS ratio is "1: 1". In the case of "3: 1", the 4th, 8th, 12th, ... Do not occur, such as 1st, 2nd, 3rd, 5th, 6th, 7th, 9th, and so on. That is, when the MS ratio is "1: 1", the number of divisions n of one cycle T of the TD modulated wave is 2 (n = 2), and a modulated wave of a multiple of 2 is not generated. On the other hand, when the MS ratio is "3: 1", the number of divisions n in one cycle T is 4 (n = 4), and a modulated wave of a multiple of 4 is not generated. Here, the large difference in spectrum when the MS ratio is "3: 1" and "1: 1" is whether or not the second-order, sixth-order, tenth-order, and so on components are generated. In the present invention, paying attention to this point, the old and new on-board devices are discriminated by the presence or absence of a secondary component of the TD signal. A secondary component having a large spectrum amplitude is preferable, but it can also be discriminated by the presence or absence of a sixth component, a tenth component, and so on.

Next, in the above configuration, the operation of discriminating between the presence / absence of the train and the type of the on-board device 1 will be described with reference to the flowchart of FIG. The TD signal transmission device 3 of the on-board device 1 outputs a TD signal as shown in FIG. 3 (a) or FIG. 3 (b) depending on whether it is an existing on-board device or a new on-board device. It is input to the TD signal receiving device 5 of the device 2 (step S1). This TD signal is input to the modulated wave detection unit 11, detected by the detector 20, and then filtered by the train detection filter 25 that passes through the primary component of the TD modulated wave (step S2). , The filter processing is executed by the type discrimination filter 26 that passes through the secondary component of the TD modulated wave (step S3).

Subsequently, the modulated wave identification unit 22 detects the level value after the filtering process. That is, the output of the train detection filter 25 is supplied to the train detection level detector 27, and the train detection level detection is performed (step S4). Further, the output of the type discrimination filter 26 is supplied to the type discrimination level detector 28 to perform the type discrimination level detection (step S5). The output signal of the train detection level detector 27 is supplied to the train detection signal threshold value determination unit 29 of the TD signal detection unit 23, and it is determined whether or not the primary component is equal to or higher than a predetermined threshold value (step S6). .. The output signal of the type discrimination level detector 28 is supplied to the type discrimination signal threshold value discrimination unit 30 of the TD signal detection unit 23, and it is determined whether or not the secondary component is equal to or higher than a predetermined threshold value (step S7). ..

Then, when the train detection signal threshold value determination unit 29 determines that the primary component is equal to or higher than a predetermined threshold value, it is determined that the train presence is detected and the train detection output is output (step S8). If it is determined that the value is less than the threshold value, the train is determined to be absent and a train non-detection output is output (step S9). Further, when the train detection signal threshold value determination unit 29 determines that the primary component is equal to or higher than a predetermined threshold value and the type determination signal threshold value determination unit 30 determines that the secondary component is equal to or higher than a predetermined threshold value (step S10). ), The new type determination output is supplied to the old and new ATC signal transmission switching unit 15 as the old and new signal switching output signal from the type discrimination signal threshold value determination unit 30 (step S12). Further, when the train detection signal threshold value determination unit 29 determines that the primary component is equal to or higher than a predetermined threshold value and the type determination signal threshold value determination unit 30 determines that the secondary component is less than a predetermined threshold value (step S11). ), The old type determination output is supplied to the old and new ATC signal transmission switching unit 15 as the old and new signal switching output signal from the type discrimination signal threshold value determination unit 30 (step S13).

In addition, in step S10 and step S11, in consideration of safety, the new model or the old model is determined and the signal is sent when the train is on the line, but the train presence condition is not taken into consideration. Since there is no problem in control, steps S10 and S11 may be omitted. In this case, when it is determined in step S7 that the secondary component is equal to or higher than a predetermined threshold value, the new determination output is supplied to the old / new ATC signal transmission switching unit 15 as the old / new signal switching output signal, and the secondary component is transferred. When it is determined that the threshold value is less than a predetermined threshold value, the old model determination output is supplied to the old / new ATC signal transmission switching unit 15 as the old / new signal switching output signal.
The output of the old ATC signal transmitter 14 is selected by the old type determination output supplied to the old and new ATC signal transmission switching unit 15, and the output of the new ATC signal transmitter 13 is selected by the new type determination output. Then, the output of the selected transmitter 13 or 14 is received by the ATC signal receiving device 4 via the ATC signal filter 18 of the on-board device 1, and the train is on / off and the type of the on-board device 1 is used. The train is controlled based on the determination result.

As described above, in the present invention, by using the same TD signal detection circuit as the conventional one and changing the detection logic, the new signal compatible on-board device (or new vehicle) or the old signal compatible on-board device (or existing) can be used. Vehicle). That is, the MS ratio of the TD signal transmitted from the on-board device 1 is changed according to whether it is a new vehicle or an existing vehicle, and the presence or absence of a secondary component of the harmonic of the signal received by the ground device 2 is detected to determine whether the vehicle is a new vehicle. Determine if it is an existing vehicle. In other words, the spectral components of the modulated wave output differ depending on whether the MS ratio of the TD signal is "1: 1" or "3: 1", so it is possible to distinguish using the difference in null points. can. Therefore, it is not necessary to change the frequency of the modulated wave, and the existing equipment can be utilized, so that it is not necessary to provide a complicated circuit having a different demodulation method.

It is necessary to add a circuit unit 100 surrounded by a broken line to the modulated wave detection unit 11 and the TD signal identification unit 12 in FIG. 2, and the circuit unit 100 is a filter, a level detector, an old / new determination unit, and the like. , The increase in circuit scale is relatively small. In addition, the presence / absence of a train is determined by the primary component of the harmonic components of the TD signal, and the old and new of the on-board device 1 is determined by the presence or absence of the secondary component, so that a high-level signal can be used. There is no need to increase the output of the TD signal.

<Modification example 1>
In the above-described embodiment, the presence / absence of the train is determined by the primary component of the harmonic components of the TD signal, and the type of the on-board device is determined by the presence or absence of the secondary component. Of these, the presence / absence of a train may be determined by the primary component, and the type of on-board device may be determined by the level ratio of the primary component and the secondary component. The detection accuracy can be improved by considering the relative ratio of the level of the secondary component to the level of the primary component.

<Modification 2>
Further, the train presence is determined to be the train presence when the primary component of the harmonic components of the TD signal is at a level equal to or higher than a predetermined threshold value. When determining the train type, noise resistance can be improved by including in the determination condition that the primary component is equal to or higher than a predetermined threshold value.

<Modification example 3>
The case where the MS ratio of "1: 1" is assigned to the new signal compatible on-board device and the MS ratio of "3: 1" is assigned to the old signal compatible on-board device has been described as an example. Needless to say, the ratio is not limited to this, and any MS ratio can be set as long as the type of on-board device can be determined based on the difference in harmonic components.

<Modification example 4>
Further, although an example in which the TD signal identification unit 12 is realized by hardware has been described, the same function can be realized by software such as a microcomputer.

The circuit configuration, operating procedure, and the like described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiments, and can be changed to various forms as long as it does not deviate from the scope of the technical idea shown in the claims.

1 ... on-board device, 2 ... ground device, 3 ... TD signal transmitter, 4 ... ATC signal receiver, 5 ... TD signal receiver, 6 ... ATC signal transmitter, 7 ... carrier generator, 8 ... modulator, 9 ... Amplifier, 10 ... Modulation wave setting unit, 11 ... Modulation wave detection unit, 12 ... TD signal identification unit, 13 ... New ATC signal transmitter, 14 ... Old ATC signal transmitter, 15 ... New and old ATC signal transmission switching unit, 20 ... Detector, 22 ... Modulated wave identification unit, 23 ... TD signal detection unit, 25 ... Train detection filter, 26 ... Type discrimination filter, 27 ... Train detection level detector, 28 ... Type discrimination level detector , 29 ... Signal threshold discrimination unit for train detection, 30 ... Signal threshold discrimination unit for type discrimination, LC ... Loop coil

Claims (6)

A train detection signal modulated from an on-board device is transmitted to a loop coil installed on the ground, and the train detection signal received by the ground device is demodulated via the loop coil to detect the presence / absence of a train and train. It is a system that controls
The mark space ratio of the train detection signal transmitted from the on-board device is changed according to the type of the on-board device, and the harmonic component of the train detection signal received by the ground device is based on a component other than the primary. A train control system that determines the type of equipment. The first aspect of claim 1, wherein the presence / absence of the train is determined by the primary component of the harmonic components of the train detection signal, and the type of the on-board device is determined by the presence or absence of the secondary component. Train control system. A claim characterized in that the presence / absence of a train is determined by the primary component of the harmonic components of the train detection signal, and the type of on-board device is determined by the level ratio of the primary component and the secondary component. Item 1. The train control system according to item 1. 2. The claim 2 is characterized by comprising a train detection filter that passes the primary component of the harmonic in the train detection signal and a type discrimination filter that passes the secondary component of the harmonic in the train detection signal. Or the train control system according to 3. A train detection level detector that detects the output level of the train detection filter, a train detection signal threshold determination unit that determines whether the output of the train detection level detector exceeds the train detection threshold, and a train detection signal threshold determination unit. A type discrimination level detector that detects the output level of the type discrimination filter and a type discrimination signal threshold value discriminator that determines whether or not the output of the type discrimination level detector exceeds the type discrimination threshold. The train control system according to claim 4, further comprising. The train control according to any one of claims 2 to 5, wherein when the primary component of the harmonic components of the train detection signal is at a level equal to or higher than a predetermined threshold value, it is determined that the train is on line. system.

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