JP2018188045A - Ground child - Google Patents

Abstract

The present invention provides a new technology for a variable frequency or resonance type ground element capable of increasing the amount of information that can be transmitted.
A ground element 1 includes a first resonance circuit 11 that resonates at a first resonance frequency with respect to a transmission signal from a vehicle upper element, and a first resonance circuit 11 that resonates at a second resonance frequency with respect to the transmission signal. 2 resonance circuits 13. And the 1st inductor L1 which comprises the 1st resonance circuit 11, and the 2nd inductor L2 which comprises the 2nd resonance circuit 13 are arrange | positioned partially overlapping by the predetermined overlap width.
[Selection] Figure 1

Description

  The present invention relates to a variable speed or resonance type ground element.

  2. Description of the Related Art Conventionally, a technique is known in which a variable speed ground unit is installed on the ground side, and the ground unit is detected on the upper side of the vehicle to perform train stop control, speed control, and the like (see, for example, Patent Document 1). The vehicle upper side receives the information from the ground side by utilizing the fact that the vehicle upper element electromagnetically couples with the ground element when the vehicle upper element approaches the ground element, and as a result, the resonance frequency of the vehicle upper element changes.

JP 2013-21745 A

  However, in the prior art, the information that can be transmitted from the ground side to the vehicle upper side by electromagnetic coupling between the vehicle upper element and the ground element is one type of information that indicates the resonance frequency. In addition, the types of resonance frequencies that can be selected are limited. Therefore, the information that can be transmitted (that is, the amount of information) is limited to the total number of types of resonance frequencies that can be selected.

  Therefore, there is a method for increasing the amount of information that can be transmitted by arranging a plurality of variable speed ground elements in the train traveling direction to form a group of ground elements, but there are some problems. For example, in order to reliably detect the resonance frequency on the upper side of the vehicle, it is necessary to increase the installation interval between the ground elements constituting a set of ground element groups by a certain distance or more. If it does so, since a train (upper side of a vehicle) will not be able to obtain one piece of information unless it detects all of a set of ground child groups, it must travel a certain distance. Since the time required to travel a certain distance is determined by the relationship with the traveling speed, there is a possibility that the traveling control may be delayed depending on the traveling speed. If the train stops in a state where only some of the ground elements constituting a set of ground elements are detected, the train (upper side of the vehicle) cannot obtain information.

  Note that a resonance type is known as an application method of the variable frequency type. The frequency dividing method is a method for changing the oscillation frequency, whereas the resonance method is a method for increasing the amplitude of the resonance frequency among a plurality of frequencies transmitted to the ground unit (for example, a spread spectrum method or , A system called a new variable frequency system, a synthetic wave system described later, and the like). In the broad sense, it is considered that the resonance type can be included in the variable frequency formula, but the variable frequency formula may be interpreted as a narrow sense, and is described as another term in this specification for the sake of safety.

  In view of the above problems, the present invention has been devised for the purpose of realizing a new technology of a variable frequency or resonance type ground element that can increase the amount of information that can be transmitted.

The first invention for solving the above-described problems is
A variable frequency or resonance type ground element,
A first resonance circuit that resonates at a first resonance frequency with respect to a transmission signal from a vehicle top;
A second resonant circuit that resonates at a second resonant frequency with respect to the transmission signal;
A ground element in which a first inductor constituting the first resonance circuit and a second inductor constituting the second resonance circuit are partially overlapped with a predetermined overlap width. is there.

  According to the first invention, a first resonance circuit that resonates at a first resonance frequency and a second resonance circuit that resonates at a second resonance frequency with respect to a transmission signal from the vehicle upper part are provided. A ground child can be realized. And the said ground element is arrange | positioned so that the 1st inductor and 2nd inductor which comprise each resonance circuit may overlap with the predetermined overlap width in the direction which cross | intersects with respect to a train traveling direction. . According to this, the ground element of the present invention resonates at two kinds of resonance frequencies, the first resonance frequency and the second resonance frequency, with respect to the transmission signal from the vehicle upper element. Therefore, information on the combination of the first resonance frequency and the second resonance frequency can be transmitted from the ground side to the vehicle upper side. Therefore, the amount of information that can be transmitted can be increased by the combination of the first resonance frequency and the second resonance frequency, and the information indicated by the combination can be transmitted to the vehicle upper side.

In addition, the second invention,
The predetermined overlap width is a width at which an electromagnetic coupling state between the first inductor and the second inductor at the time of resonance with respect to the transmission signal becomes a predetermined reduced state.
This is the ground element of the first invention.

  According to the second invention, the inductors are overlapped with each other so that the electromagnetic coupling state between the first inductor and the second inductor at the time of resonance with respect to the transmission signal from the vehicle upper arm becomes a predetermined reduced state. Can be arranged.

Furthermore, the third invention
The first inductor and the second inductor are configured by pattern mounting on a substrate,
It is the ground element of 2nd invention which incorporated the said board | substrate.

  According to the third invention, the first inductor and the second inductor can be configured by pattern mounting on the substrate. According to this, it is possible to improve the accuracy of the overlapping width of each inductor and to suppress the manufacturing variation of the ground element related to the overlapping width. Therefore, in combination with the second invention, it is possible to manufacture a ground element that exhibits the effect of the first invention while suppressing manufacturing variations.

As invention which suppresses manufacturing variation, for example, as 4th invention,
The width to be the predetermined reduction state is within an error range of 5 mm or less with respect to a predetermined design width in which the electromagnetic coupling state is a zero equivalent state.
The ground element of 2nd or 3rd invention can be comprised.

In addition, the fifth invention,
The first resonance circuit and the second resonance circuit are configured such that the resonance frequency can be changed by changing a capacitor without changing the first inductor and the second inductor.
This is the ground element of any one of the second to fourth inventions.

  According to the fifth aspect, the first resonance frequency and / or the second resonance frequency is changed by changing the corresponding capacitor with respect to the first inductor and the second inductor stacked with a predetermined overlap width. can do.

In addition, the sixth invention,
The transmission signal is a synthesized signal of a predetermined frequency band including a plurality of frequency components,
The first resonance circuit and the second resonance circuit are configured to be changeable to a resonance frequency that can resonate within the frequency band by changing a capacitor.
It is the ground element of 5th invention.

  According to the sixth aspect, by changing the capacitor, the resonance frequency of each resonance circuit can be changed within the frequency band of the composite signal output as the transmission signal from the vehicle upper element.

In addition, the seventh invention,
The first inductor and the second inductor are arranged so as to be partially overlapped with the predetermined overlap width in a direction intersecting the train traveling direction,
This is the ground element of any one of the first to sixth inventions.

  According to the seventh aspect, there is a high possibility that information on the combination of the first resonance frequency and the second resonance frequency can be transmitted from the ground side to the vehicle upper side at a time. Therefore, the information indicated by the combination of the first resonance frequency and the second resonance frequency can be reliably transmitted to the vehicle upper side at a time.

The schematic diagram which shows the outline of the track | orbit which installed the structure of the ground child and the said ground child. The figure explaining arrangement | positioning of a 1st inductor and a 2nd inductor. The figure which shows the resonant frequency characteristic of a ground element. The figure explaining arrangement | positioning of the inductor in a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments described below, and modes to which the present invention can be applied are not limited to the following embodiments. In the description of the drawings, the same parts are denoted by the same reference numerals.

  FIG. 1 is a schematic diagram showing an outline of the configuration of the ground unit 1 and the trajectory in which the ground unit 1 is installed in the present embodiment. As shown in FIG. 1, the ground piece 1 is installed inside the rails 3, 3 at the upper part of the sleepers 5 that support the pair of rails 3, 3, between the sleepers 5, and the like. The ground element 1 is installed between the rails 3 and 3 so that the arrangement direction of the first inductor L1 and the second inductor L2 intersects the train traveling direction (direction along the rails 3 and 3).

  The ground element 1 is a variable speed or resonance type ground element, and a first resonance circuit 11 that resonates at a first resonance frequency f1 with respect to a transmission signal from an upper element of a train passing above, And a second resonance circuit 13 that resonates at a second resonance frequency f2. In addition, the ground unit 1 has a circuit composed of passive elements, does not require a power source, does not include a so-called electronic circuit such as an arithmetic circuit or a relay, and does not require a cable connection with other devices. It is a device that can be installed only with a single device.

  The first resonance circuit 11 has a first inductor L1 and a capacitor C1, and the second resonance circuit 13 has a second inductor L2 and a capacitor C2. The ground element 1 is configured such that the first inductor L1 of the first resonance circuit 11 and the second inductor L2 of the second resonance circuit 13 are partially overlapped.

  FIG. 2 is a diagram for explaining the arrangement of the first inductor L1 and the second inductor L2 in the ground element 1 of the present embodiment, and is an overhead view of the ground element 1. FIG. As shown in FIG. 2, each of the first inductor L1 and the second inductor L2 is mounted by printing a spiral coil pattern on the substrate 15, and each inner region has a predetermined overlapping width in a top view. They are arranged so as to overlap by the amount of W1. The number of turns of the coil pattern can be set as appropriate, and can be increased by forming a through hole in the inner layer direction of the substrate 15. The overlapping width W1 is a width at which the electromagnetic coupling state between the first inductor L1 and the second inductor L2 at the time of resonance with respect to the transmission signal from the vehicle upper is a predetermined reduced state. The reduced state refers to a state where the electromagnetic coupling state between the first inductor L1 and the second inductor L2 at the time of the resonance is sufficiently small to be negligible.

  Here, the degree of electromagnetic coupling between the first inductor L1 and the second inductor L2 during the resonance increases or decreases depending on the overlap width W1. For example, when attention is paid to the magnetic flux generated in the first inductor L1 at the time of the resonance, the direction of the magnetic flux generated in the first inductor L1 through the second inductor L2 is the first of the inner regions of the second inductor L2. The portion 131 (the portion surrounded by the alternate long and short dash line) 131 that overlaps the inductor L1 and the portion that does not overlap the first inductor L1 (the portion enclosed by the alternate long and two short dashes line) 133 are reversed. This is because the magnetic flux cancels each other and the sum thereof changes. The same can be said for the direction of the magnetic flux generated in the second inductor L2 through the first inductor L1 during the resonance. Accordingly, the overlap width W1 is set so that the total magnetic flux of the portions 131 and 133 becomes 0 (or equivalent to 0 (zero)), in other words, the portions 131 and 133 have the same magnetic flux. If set, the electromagnetic coupling between the first inductor L1 and the second inductor L2 at the time of the resonance can be set to a substantially zero state (zero equivalent state).

  Therefore, an electromagnetic field analysis is performed in advance, and an overlap width that makes the electromagnetic coupling state equivalent to zero is defined as a design width. A reduced state of the electromagnetic coupling state is realized by manufacturing the first inductor L1 and the second inductor L2 so as to overlap each other with an overlap width W1 within an error range of 5 mm or less with respect to the design width. To do. According to this, it is possible to suppress a situation in which the inductors L1 and L2 are electromagnetically coupled during resonance with respect to a transmission signal from the vehicle upper arm and affect the resonance frequency characteristics (see FIG. 3) of the resonance circuits 11 and 13. Therefore, it is possible to accurately transmit information on the combination of the resonance frequencies f1 and f2 to the ground side.

  Further, the inductor is manufactured not by a conventional method of manually winding an electric wire but by pattern mounting such as a copper foil on the substrate 15. Therefore, the manufacturing variation of the ground element 1 with respect to the overlapping width W1 can be suppressed to an error range of 5 mm or less with respect to the design width, and a high-quality ground element that reliably resonates at two specific resonance frequencies f1 and f2. Mass production can be realized easily and practically.

  Capacitors C1 and C2 have necessary capacitance values corresponding to corresponding resonance frequencies f1 and f2. For example, two capacitors corresponding to different resonance frequencies are selected from a plurality of types (for example, nine types) of capacitor elements having different resonance frequencies, and are connected to the inductors L1 and L2 by being mounted on the ground element 1. Can be used. Alternatively, a configuration may be adopted in which a plurality of types of capacitor elements are mounted on the ground element 1 and selectively connected to the inductors L1 and L2 via a switch for selecting or combining the capacitor elements.

According to this, by changing the capacitors C1 and C2 without changing the inductors L1 and L2, the ground element 1 that resonates at two desired resonance frequencies f1 and f2 can be easily configured. Since the substrate 15 on which the inductors L1 and L2 are mounted can be used in common, it is advantageous in terms of cost for manufacturing the substrate 15. Therefore, the ground unit 1 can transmit information indicated by a combination of different resonance frequencies f1 and f2 to the vehicle upper side. The total number of combinations is, M kinds types of resonance frequencies, if the number of resonant circuits is N, the street _M C _N. For example, when the number of resonance circuits is two (N = 2) and nine types of capacitor elements are prepared (M = 9), 36 kinds of information can be transmitted.

  The ground element 1 configured as described above has the rail 3 in such a direction that the arrangement direction of the inductors L1 and L2 arranged with a predetermined overlap width W1 intersects the train traveling direction (direction along the rails 3 and 3). , 3 is installed. Therefore, when the vehicle upper element passes above the ground element, the ground element resonates simultaneously with two types of resonance frequencies, the first resonance frequency f1 and the second resonance frequency f2, with respect to the transmission signal from the vehicle element. To do.

FIG. 3 shows an outline of the resonance frequency characteristics of the ground element 1 and transmission signals transmitted by the vehicle upper element in order to detect the resonance frequencies f1 and f2. As shown in FIG. 3, the vehicle upper core outputs a combined signal of a predetermined frequency band F _{L to} F _H including a plurality of frequency components as a transmission signal. The frequency bands F _{L to} F _H are appropriately set within a range of 50 kHz to 300 kHz. Therefore, on the vehicle upper side, two types of resonance frequencies f1 and f2 having a large amplitude are obtained from the resonance frequency characteristics of the ground element 1 by analyzing the frequency signal generated in the vehicle element when the ground element 1 resonates with respect to the transmission signal. It can be detected almost simultaneously.

  As described above, according to the present embodiment, the first resonance circuit 11 that resonates at the first resonance frequency f1 and the first resonance circuit that resonates at the second resonance frequency f2 with respect to the transmission signal from the vehicle upper element. The ground element 1 including the two resonance circuits 13 can be realized. Then, the first inductor L1 and the second inductor L2 can be partially overlapped with a predetermined overlap width W1 in a direction intersecting the train traveling direction. According to this, since the information of the combination of the first resonance frequency f1 and the second resonance frequency f2 can be transmitted from the ground side to the vehicle upper side at a time, it is possible to increase the amount of information that can be transmitted by the combination. Thus, the information indicated by the combination can be reliably transmitted to the vehicle upper side at a time.

In the above-described embodiment, the ground element 1 including the two resonance circuits 11 and 13 has been described. However, the ground element can also be configured by including three resonance circuits. FIG. 4 is a bird's-eye view showing the arrangement of the three inductors L11, L12, and L13 in the ground element having three resonance circuits. Each of the inductors L11, L12, and L13 is configured by a spiral coil pattern as in FIG. 2, but in FIG. 4, it is simply expressed by a rectangular thick solid line. Similarly to the inductors L1 and L2 of the above-described embodiment, the inductors L11 and L12 are partially overlapped in the direction intersecting the train traveling direction, and the inductor L13 is train-driven with respect to the inductors L11 and 12. Arranged so as to partially overlap in the direction. In the ground element of FIG. 4, for example, the inductor L <b> 11 is arranged so that the inner region indicated by hatching in FIG. 4 partially overlaps the other two inductors L <b> 12 and L <b> 13. Also in the case of this modification, a design width is defined in advance so that the electromagnetic coupling states between the inductors L11, L12, and L13 at the time of resonance with respect to the transmission signal from the vehicle upper arm are all equivalent to zero. In other words, the inductors L11, L12, and L13 may be stacked and manufactured with overlapping widths W11 and W13 within an error range of 5 mm or less. Of course, the inductors L11, L12, and L13 are manufactured by pattern mounting of a copper foil or the like on the substrate as in FIG. In this case, for example, if there are nine types of resonance frequencies (M = 9) and three different resonance frequencies are combined without allowing overlap, the total number is ₉ C _three ways (84 ways). 84 types of information can be transmitted.

  In the above-described embodiment, the first inductor L1 and the second inductor L2 are partially overlapped with a predetermined overlap width W1 in a direction intersecting the train traveling direction. The arrangement direction of the first inductor L1 and the second inductor L2 is not particularly limited. For example, it may be arranged partially overlapping with a predetermined overlapping width along the train traveling direction.

  DESCRIPTION OF SYMBOLS 1 Ground element, 11 1st resonance circuit, L1 1st inductor, C1 capacitor | condenser, 13 2nd resonance circuit, L2 2nd inductor, C2 capacitor | condenser, 15 board | substrate, f1 1st resonance frequency, f2 2nd Resonance frequency, W1, W11, W13 Overlap width, 3 rails, 5 sleepers

Claims (7)

A variable frequency or resonance type ground element,
A first resonance circuit that resonates at a first resonance frequency with respect to a transmission signal from a vehicle top;
A second resonant circuit that resonates at a second resonant frequency with respect to the transmission signal;
A ground element in which a first inductor constituting the first resonance circuit and a second inductor constituting the second resonance circuit are partially overlapped with a predetermined overlap width. The predetermined overlap width is a width at which an electromagnetic coupling state between the first inductor and the second inductor at the time of resonance with respect to the transmission signal becomes a predetermined reduced state.
The ground unit according to claim 1. The first inductor and the second inductor are configured by pattern mounting on a substrate,
The ground unit according to claim 2, wherein the substrate is incorporated. The width that becomes the predetermined reduced state is within an error range of 5 mm or less with respect to a predetermined design width that makes the electromagnetic coupling state equivalent to zero.
The ground unit according to claim 2 or 3. The first resonance circuit and the second resonance circuit are configured such that the resonance frequency can be changed by changing a capacitor without changing the first inductor and the second inductor.
The ground unit according to any one of claims 2 to 4. The transmission signal is a synthesized signal of a predetermined frequency band including a plurality of frequency components,
The first resonance circuit and the second resonance circuit are configured to be changeable to a resonance frequency that can resonate within the frequency band by changing a capacitor.
The ground unit according to claim 5. The first inductor and the second inductor are arranged so as to be partially overlapped with the predetermined overlap width in a direction intersecting the train traveling direction,
The ground unit according to any one of claims 1 to 6.

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