JP4956056B2 - Information transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information transmission system that can increase the amount information transmission from the ground to a train. <P>SOLUTION: In the information transmission system, prescribed information is transmitted to the train from the ground via a wayside coil, when the wayside coil on the ground provided along the track on which the train is traveling and an on-car apparatus provided in the train are connected electromagnetically. Here a plurality of resonance circuits, having different resonance frequencies mutually and the on-car apparatus for processing a signal inputted via the on-car apparatus to receive the prescribed information transmitted from the ground in the casing of the wayside coil, are installed. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an information transmission system used for train control, and more particularly, to a system capable of transmitting a large amount of train control information from the ground to the vehicle.

  2. Description of the Related Art Conventionally, as an information transmission system for transmitting train control information from the ground to the vehicle (train), an ATS device that employs a frequency change method is known (see Non-Patent Document 1). As shown in FIG. 6, this variable speed ATS device includes an on-board device 30 mounted on a train T traveling on a rail (track) r, an oscillator (OSC) 31, a filter circuit (bandpass filter). ) 32, a level detector 33, a rectifier 34 and a CPU 35 are provided. Further, an upper part 36 composed of a loosely coupled transformer is provided at the lower part of the head of the train T, and this upper part 36 is connected between the input and output of the OSC 31 of the on-board device 30. Is provided. The OSC 31 has a role of an amplifier having a predetermined amplification factor μ, and the on-board element 36 has a role of an attenuator having a predetermined attenuation rate β, and oscillation of μ × β = 1. The condition is met and oscillated.

  In the variable speed ATS device having the above configuration, when the train T on which the on-board device 30 is mounted approaches the ground unit 37 and is in an electromagnetically coupled state, a part of the output of the OSC 31 passes through the on-board unit 36. At this time, the frequency on the vehicle (for example, 103 KHz) is changed to the frequency of the ground unit 37 (for example, 130 KHz) due to the frequency pull-in phenomenon because the Q of the ground unit 37 is sufficiently high. Therefore, the CPU 35 can detect that the train T has been positioned on the ground element 37 when the frequency has changed from the previous frequency (103 KHz) to the frequency of the ground element 37 (130 KHz). The predetermined train control can be performed based on the frequency (130 KHz).

  However, this variable frequency ATS device has a drawback that it is vulnerable to noise and interference waves theoretically, as can be seen from the mechanism for generating oscillation in an unstable state. In particular, the vehicle upper body 36 is composed of a transformer in which a coil is molded with a synthetic resin, and not only the coupling characteristics of the primary coil and the secondary coil of the vehicle upper body 36 are changed by the influence of surrounding metal, but also the coupling is performed by the vehicle. There is a problem that the degree changes. Furthermore, since the degree of coupling of the vehicle upper piece 36 changes depending on the use environment of the vehicle upper piece 36, there is a trouble that the degree of coupling of the vehicle upper piece 36 must be periodically adjusted.

Therefore, an ATS device including an oscillation circuit that does not use the above-described unstable feedback oscillation circuit of the variable frequency system has been proposed (see Patent Documents 1 and 2). The ATS devices according to these proposals are provided with a signal generation circuit that stably generates a plurality of frequencies corresponding to a ground element installed on the ground in the on-board device, and a plurality of signals generated from the signal generation circuit. The signal is configured to be supplied to the vehicle upper member via an adding circuit. Moreover, the signal obtained from this vehicle top is comprised so that it may be extracted through the several filter circuit which each passes each frequency. Then, when the train approaches the ground element transmitting a predetermined frequency and the vehicle upper element and the ground element are in an electromagnetically coupled state, the frequency of the vehicle upper element is tuned to the frequency of the ground element. It is configured. Thus, the on-board device can detect that the train is located at the position of the ground element and can perform predetermined train control based on the obtained frequency from the ground element.
April 15, 1997 (Japan) Japan Railway Electrical Engineering Association (Fourth Edition) Introduction to Electricity for Railway Engineers Signal Series 7 6-22 Japanese Patent Laid-Open No. 11-255124 JP 2005-229789 A

  The variable speed ATS device according to the above proposal has a signal generation circuit capable of generating a signal having a frequency corresponding to the ground element provided on the ground in the on-board device. Compared to the ATS system of the system, stable signals can be generated at all times, and it has excellent features such as being unaffected by changes in the surrounding environment. There is a desire to increase the amount of information up. In order to meet this demand, it may be possible to increase the number of ground units installed and combine the order of receiving the frequency-divided signals. However, in this case, the number of ground units will increase and equipment costs will increase. A new problem will occur.

  Therefore, the present invention has been made to solve the above-mentioned drawbacks and to meet the above-mentioned demands, and the purpose thereof is to increase the amount of information from the ground to the vehicle, in addition to the existing ground equipment. Is to provide an information transmission system that can be realized at low cost.

In order to achieve the above object, an information transmission system according to the present invention is characterized in that the invention according to claim 1 includes a plurality of ground elements provided along a track on which the train travels and at a predetermined interval from each other. And the vehicle upper element provided in the train are electromagnetically coupled to each other, the information transmission system for transmitting predetermined information from the ground to the vehicle via the ground element, the plurality of ground elements are: A ground element provided with a single resonance circuit having a predetermined resonance frequency in the casing and a ground element provided with a plurality of resonance circuits having different resonance frequencies in the casing; An on-board device for processing the input signal and receiving predetermined information transmitted from the ground, the on-board device is configured to periodically generate a spectrum signal including a plurality of signals, The signal generating means Supply means for supplying the generated signal to one coil constituting the vehicle upper element, input means for inputting a signal from the other coil constituting the vehicle upper element, and a signal input by the input means for a predetermined value Separation means for classifying by frequency, detection means for detecting a level change of the signal classified by the classification means, and extraction for extracting information transmitted from the ground toward the vehicle based on the detection of the detection means Means.
The information transmission system according to claim 2 of the present invention is characterized in that the classification means performs classification by FFT calculation processing.
The information transmission system according to claim 3 of the present invention is characterized in that the extraction means includes a function of monitoring the signal generation state of the signal generation means.

The information transmission system according to claim 1 of the present invention is a ground unit in which a plurality of ground elements are provided with a single resonance circuit having a predetermined resonance frequency in the casing, and a plurality of resonances having different resonance frequencies in the casing. The on-board device includes a signal generating means for periodically generating a spectrum signal including a plurality of signals, and the signal generated by the signal generating means constitutes the on-board element. Supply means for supplying to one coil, input means for inputting a signal from the other coil constituting the vehicle upper member, separation means for separating the signal input by the input means for each predetermined frequency, and the separation A detecting means for detecting a level change of the signal separated by the means, and an extracting means for extracting information transmitted from the ground toward the vehicle based on the detection of the detecting means. Installation Even without Yasa can increase the train control information from the ground onto the vehicle, it is possible to achieve a high degree of train control. Furthermore, the existing ground element can be used as it is. In addition, all the frequencies used on the ground side can be covered with a single signal generation circuit, and there is a feature that the power consumption is small, the heat generation amount is small, and the size can be reduced.
In the information transmission system according to the second aspect of the present invention, since the sorting means sorts by FFT calculation processing, it can easily and accurately detect that the train and the ground unit are electromagnetically coupled.
In the information transmission system according to claim 3 of the present invention , the extraction means is configured to include a function of monitoring the signal generation state of the signal generation means, so that the abnormal state of the signal generation means can be accurately detected. it can.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an ATS device according to the present invention, and an on-board device 1 of a train T traveling on a rail r corresponding to the track of the present invention has a resonance frequency used on the ground side, That is, a signal generation circuit 2 is provided for constantly generating a signal corresponding to the resonance frequency used in the ground elements a ₁ and a ₂ provided along the rail r and at a predetermined interval. .

  In FIG. 1, only two ground elements are provided in order to simplify the drawing. However, in actuality, three or more ground elements are provided at predetermined positions on the rail r with a predetermined distance, and the current signal is displayed. Information consisting of signals of a predetermined frequency corresponding to the indications and the like can be transmitted toward the vehicle (train T). Examples of the predetermined frequency are 123 KHz and 130 KHz.

Of the above-described ground elements a ₁ and a ₂ , the ground element a ₁ has a resonance circuit having a signal of a predetermined resonance frequency (hereinafter, this signal is referred to as “f ₁ ”) in a waterproof casing a ′. 10a and a resonance circuit 10b having a signal having a predetermined resonance frequency different from the frequency of the signal f ₁ (hereinafter, this signal is referred to as “f ₂ ”). Accordingly, signals f ₁ and f ₂ are transmitted from the ground unit a ₁ toward the vehicle. The ground unit a ₂ has a signal having a predetermined resonance frequency (hereinafter, this signal is referred to as “f ₃ ”) in the waterproof casing a ′, similarly to the conventional known ground unit. A resonance circuit 10c is provided. Therefore, the signal f ₃ is transmitted from the ground unit a ₂ toward the vehicle. In the example shown in the figure, the two signals f ₁ and f ₂ are transmitted from the ground element a _1. However, when three or more signals are transmitted, the casing a ′ has a resonance frequency. Three or more different resonant circuits are provided.

The signal generation circuit 2 is a signal generation circuit in which a plurality of oscillation circuits capable of generating signals f _{1 to} f ₃ having the types of frequencies used in the ground elements a ₁ and a ₂ are arranged in parallel. If the frequency used on the ground side (ground side) is three (f ₁ , f ₂ , f ₃ ), it can be configured by arranging three signal generation circuits in parallel, As a signal generating means, a spread spectrum signal generating circuit as shown in FIG. 2 is used. The signal generation circuit 2 will be described later.

In FIG. 1, reference numeral 3 denotes an amplifying circuit constituted by a well-known amplifying circuit, which is configured to amplify the signal output from the signal generating circuit 2. In FIG. 1, reference numeral 4 denotes a bandpass filter composed of a well-known bandpass filter that can pass only a signal in a predetermined band so that the signal output from the amplifier circuit 3 can be filtered. It is configured. The signal filtered by the bandpass filter 4 is connected to one coil (inside the casing b 'of the vehicle upper b provided at the lower end of the train T via the connection transformer 5a). is configured to be the primary coil) supplied to b ₁ (applied).

The other coil (secondary coil) b ₂ in the casing b ′ of the vehicle upper b is connected to an analog / digital circuit (A / D circuit) 6 provided in the vehicle upper device 1 via a connection transformer 5b. It is connected. The output signal of the A / D circuit 6 is configured to be input to a well-known FFT arithmetic processing circuit 7 that samples the input signal at regular intervals and performs frequency analysis processing.

The output signal of the FFT arithmetic processing circuit 7 is a pattern DET (detection circuit) that detects the output of the FFT arithmetic processing circuit 7 and detects the coupling state with the ground elements a ₁ and a ₂ using a predetermined threshold value. ) 8 is input. The output of the pattern DET8 is configured to be input to the CPU 9. The CPU 9 analyzes the input signal to analyze the output state of the signal generating circuit 2 and the information obtained from the ground side when the vehicle element b is coupled to the ground elements a ₁ and a _2. The control signal can be generated.

FIG. 2 is a detailed diagram of the signal generation circuit 2 provided in the on-board device 1, and this signal generation circuit 2 includes a plurality of frequencies including all frequencies used on the ground side (ground element side) by the spread spectrum method. These signals are continuously output. That is, the signal generating circuit 2, a shift register which band of the signal transmitted by the predetermined zoom divided clock signal f _c together with defined, the number of signals to be transmitted in the band by a predetermined number of bits N is determined 20, an exclusive OR circuit 21 for feedback, and an OR circuit 22 that defines the center frequency f ₀ of the transmission signal band, and generates an M-sequence code (Maximum Length Line Shift Register Sequence). Thus, the signal is continuously spread.

The signal generation circuit 2 will be described using specific numerical values. The ground-side ground elements a ₁ and a ₂ have four frequencies of 103 KHz, 108.5 KHz, 123 KHz, and 130 KHz, as in the case of a normal ground element. Is used. Therefore, in this signal generation circuit 2, it is necessary to periodically generate a signal including signals of at least these four types of frequencies. By the way, since the four types of frequency bands are 103 to 130 KHz, the carrier wave at the center frequency of the spectrum can be set to 115 KHz. And if a spreading | diffusion frequency is set to 25 KHz, the frequency (103-130 KHz) currently used on the ground side can be covered. Further, since the code length (2 ⁿ −1) (n is the number of stages of the shift register 20) is defined by the number of stages of the shift register 20, when the number of stages is 6, the spectrum interval is 25 KHz ÷ (2 ⁶ -1), and the interval is about 400 Hz. FIG. 3 shows a spectrum schematically representing this. That is, FIG. 3 shows the state of the frequency of the signal that the signal generation circuit 2 periodically outputs. In addition, each numerical value mentioned above is an example, and this invention is not limited by these numerical values.

Therefore, if the signal generation circuit 2 is normal, the FFT arithmetic processing circuit 7 can output the frequency component shown in FIG. Therefore, the CPU 9 can determine whether the signal generation circuit 2 is normal or abnormal by monitoring the output state of these frequency components. In FIG. 1, (a) schematically shows the spectrum shown in FIG. 3, and shows a state in which the vehicle upper element b is not coupled to any of the ground elements a ₁ and a _2. Yes.

FIG. 4 shows that the signal frequency of the spectrum X ₁ is f ₃ for convenience of explanation, and when the resonance frequency f ₃ of the ground element a ₂ is used, the vehicle element b and the ground element a ₂ are When electromagnetically coupled, the spectrum X ₁ has a higher voltage level of X ₁ , as shown in FIG. 4, and the level of the spectrum X ₁ becomes higher than the verification level for monitoring the signal generation circuit 2. spectrum X ₁ using the predetermined reception level in patterns DET8 is determined to have exceeded a predetermined value. Thus, CPU 9 is adapted to detect the on-board coil b is electromagnetically coupled to the ground element a _2, and thus for generating a predetermined train control signal based on the signal f ₃ obtained from the ground coil a ₂ . In FIG. 1, (B) schematically shows the spectrum shown in FIG. 4, and shows a state in which the vehicle upper element b is coupled to the ground element a ₂ .

FIG. 5 shows a case where the signal frequencies of the spectra X ₂ and X ₃ are f ₁ and f ₂ for convenience of explanation, and the ground element a ₁ has two resonance frequencies f ₁ and f _2. Yes. In this case, when the vehicle element b and the ground element a ₁ are electromagnetically coupled, the spectrums X ₂ and X ₃ have the voltage levels of X ₂ and X _{3 in} the signal generation circuit 2 as shown in FIG. Each value is higher than the check level for monitoring, and in the pattern DET8, it is determined that the spectra X ₂ and X ₃ exceed a predetermined value using a predetermined reception level. Thus, CPU 8 is, it is possible to detect the on-board coil b is electromagnetically coupled to the ground element a _1, the signal f ₁ obtained from the ground coil a _1, f _2, and these signals f _1, f ₂ A predetermined train control signal can be generated on the basis of the combination. In FIG. 1, (c) schematically shows the spectrum shown in FIG. 5, and shows a state in which the vehicle upper element b is coupled to the ground element a ₁ .

In the information transmission system configured as described above, when the train T travels in the direction of the arrow (in the example of FIG. 1, the direction of traveling from the right side to the left side), as shown in FIG. _When neither ₁ nor a ₂ is electromagnetically coupled, the signal generated from the signal generating circuit 2 side is directly received by the CPU 9 side. Therefore, if the signal generation circuit 2 is normal, the FFT arithmetic processing circuit 7 can output the frequency component shown in FIG. Therefore, the CPU 9 can determine whether the signal generation circuit 2 is normal or abnormal by monitoring the output state of the frequency component.

When the train T travels and the vehicle upper b is electromagnetically coupled to the ground a ₂ , the voltage level of the spectrum (refer to X _{1 in} FIG. 4) corresponding to the signal f ₃ is increased. thereby detecting a child b is electromagnetically coupled to the ground element a _2, and thus for generating a predetermined train control signal based on the signal f ₃ obtained from the ground coil a _2. When the train T further travels and the vehicle upper b is electromagnetically coupled to the ground child a ₁ , the voltage levels of the spectra (see X ₂ and X _{3 in} FIG. 5) corresponding to the signals f ₁ and f ₂ become high values. , thereby CPU9 is, it is possible to detect the on-board coil b is bonded ground coils a ₁ and the electromagnetic, the ground coil a ₁ signal f ₁ obtained from, f _2, and these signals f _1, f ₂ A predetermined train control signal can be generated on the basis of the combination.

  As described above, the signal generation circuit 2 used in the on-board device 1 can cover all the frequencies used on the ground side with a single signal generation circuit, so that it consumes less power and therefore generates less heat. Moreover, it has the feature that it can be miniaturized.

  Furthermore, the information transmission system according to the present invention can increase the information transmitted from the ground to the vehicle without increasing the number of ground units installed, and can realize advanced train control at low cost. . In addition, the information transmission system according to the present invention can be used together with the equipment of an existing variable speed ATS device, so that it has the feature that the amount of information can be increased by using conventional ground and on-board devices. Yes.

  In the above-described example, the frequency analysis method is used for the receiving side configuration of the on-board device 1 using the FFT arithmetic circuit 7, but this receiving side configuration may be an analog method using a plurality of bandpass filters. it can.

1 is a schematic configuration diagram of an information transmission system according to an embodiment of the present invention. It is a detailed diagram of a signal generation circuit. It is explanatory drawing of a spectrum. It is explanatory drawing of a spectrum. It is explanatory drawing of a spectrum. It is a schematic block diagram of the conventional variable speed ATS apparatus.

Explanation of symbols

r Track (rail)
T Train 1 On-board device 2 Signal generation circuit 3 Amplification circuit 4 Band pass filter 5a, 5b Connection transformer 6 A / D circuit 7 FFT arithmetic processing circuit 8 Pattern DET
9 CPU
20 shift register 21, 22 exclusive OR circuits a _1, a ₂ ground coil a'housing 10a, 10b, 10c resonant circuit b board coil b'housing b _1, b ₂ coils

Claims (3)

When a plurality of ground elements provided along a track on which a train travels and spaced from each other are electromagnetically coupled to a vehicle upper element provided in the train, the ground In an information transmission system that transmits predetermined information from the vehicle to the vehicle,
  The plurality of ground elements are composed of a ground element in which a single resonance circuit having a predetermined resonance frequency is provided in a casing and a ground element in which a plurality of resonance circuits having different resonance frequencies are provided in the casing,
  The train is provided with an on-board device that processes a signal input via the on-board element and receives predetermined information transmitted from the ground, and the on-board device receives a spectrum signal including a plurality of signals. Signal generating means for periodically generating, supply means for supplying the signal generated by the signal generating means to one coil constituting the vehicle upper element, and signals input from the other coil constituting the vehicle upper element Based on the detection of the detection means, the detection means for detecting the level change of the signal classified by the classification means, the classification means for classifying the signal input by the input means for each predetermined frequency An information transmission system comprising: extraction means for extracting information transmitted from the ground toward the vehicle. The information transmission system according to claim 1, wherein the classification unit performs classification by FFT operation processing. 3. The information transmission system according to claim 2, wherein the extraction unit includes a function of monitoring a signal generation state of the signal generation unit.

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