JP6941475B2 - Ground child - Google Patents

Description

The present invention relates to a variable frequency type or a resonant type ground element.

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

Japanese Unexamined Patent Publication No. 2013-21745

However, in the conventional technique, the information that can be transmitted from the ground side to the upper side of the vehicle by the electromagnetic coupling between the on-board element and the ground element is one kind of information on what the resonance frequency is. 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, a method of increasing the amount of information that can be transmitted by arranging a plurality of variable frequency ground elements in the train traveling direction to form a set of ground elements is conceivable, 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 separate the installation intervals between the ground elements constituting one set of ground element groups by a certain distance or more. Then, since the train (upper side of the vehicle) cannot obtain one piece of information unless it detects all the set of ground subgroups, it is essential to travel a certain distance. Since the time required for traveling a certain distance is determined in relation to the traveling speed, there is a possibility that the traveling control may be delayed depending on the traveling speed. If the train stops while only some of the ground elements that make up a set of ground elements are detected, the train (upper side of the vehicle) will not be able to obtain information.

The resonance type is known as an application method of the variable frequency type. While the variable frequency type is a method of changing the oscillation frequency, the resonance type is a method of increasing the amplitude of the resonance frequency among a plurality of frequencies transmitted to the ground element side (for example, a spread spectrum method or a method). , A method also called a new frequency change method, a synthetic wave method described later, etc.). In a broad sense, it is considered that the resonance type can be included in the variable frequency type, but the variable frequency type may be interpreted in a narrow sense, and is described as a different term in this specification just in case.

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

The first invention for solving the above problems is
A variable or resonant ground element,
A first resonant circuit that resonates at the first resonant frequency with respect to the transmitted signal from the on-board element,
A second resonant circuit that resonates with the transmitted signal at a second resonant frequency,
The first inductor that constitutes the first resonant circuit and the second inductor that constitutes the second resonant circuit are ground elements that are partially overlapped with each other with a predetermined overlapping width. be.

According to the first invention, the first resonance circuit that resonates at the first resonance frequency and the second resonance circuit that resonates at the second resonance frequency are provided with respect to the transmission signal from the vehicle head element. A ground child can be realized. Then, the ground element is arranged so that the first inductor and the second inductor constituting each resonance circuit are partially overlapped with a predetermined overlapping width in a direction intersecting the train traveling direction. .. According to this, the ground element of the present invention resonates with the transmitted signal from the on-board element at two types of resonance frequencies, a first resonance frequency and a second resonance frequency. 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 upper side of the vehicle.

Moreover, the second invention is
The predetermined overlap width is a width at which the 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.
It is a ground element of the first invention.

According to the second invention, the inductors are stacked 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 on-vehicle element becomes a predetermined reduced state. Can be placed.

Furthermore, the third invention
The first inductor and the second inductor are configured by pattern mounting on a substrate.
It is a ground element of the second invention in which the substrate is built.

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

As an invention for suppressing manufacturing variation, for example, as a fourth invention,
The width of the predetermined reduction state is within an error range of 5 mm or less with respect to the predetermined design width in which the electromagnetic coupling state is equivalent to zero.
The ground element of the second or third invention can be constructed.

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

According to the fifth invention, 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 overlapping width. can do.

Moreover, the sixth invention is
The transmission signal is a composite 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 be resonated within the frequency band by changing the capacitor.
It is a ground element of the fifth invention.

According to the sixth invention, the resonance frequency of each resonance circuit can be changed within the frequency band of the combined signal output as the transmission signal from the on-board element by changing the capacitor.

Moreover, the seventh invention is
The first inductor and the second inductor are partially overlapped with each other in the direction intersecting the train traveling direction with the predetermined overlapping width.
It is a ground element of any one of the first to sixth inventions.

According to the seventh invention, 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 upper side of the vehicle at once. Therefore, the information indicated by the combination of the first resonance frequency and the second resonance frequency can be reliably transmitted to the upper side of the vehicle at one time.

The schematic diagram which shows the structure of the ground element and the outline of the orbit in which the ground element is installed. The figure explaining the arrangement of the 1st inductor and the 2nd inductor. The figure which shows the resonance frequency characteristic of a ground element. The figure explaining the arrangement of the inductor in the modification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the present invention, and the embodiments to which the present invention can be applied are not limited to the following embodiments. Further, in the description of the drawings, the same parts are designated by the same reference numerals.

FIG. 1 is a schematic view showing the configuration of the ground element 1 in the present embodiment and the outline of the track on which the ground element 1 is installed. As shown in FIG. 1, the ground element 1 is installed inside the rails 3 and 3 in the upper part of the sleepers 5 supporting the pair of rails 3 and 3 and between the sleepers 5. Further, 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 frequency type or resonance type ground element, and has a first resonance circuit 11 that resonates at a first resonance frequency f1 with respect to a transmission signal from an on-board element of a train passing above. A second resonance circuit 13 that resonates at the second resonance frequency f2 is provided. Further, the ground element 1 is composed of a passive element, does not require a power supply, does not have a so-called electronic circuit such as an arithmetic circuit, a relay, or the like, and does not require a cable connection with another device. It is a device that can be installed with only a single device.

The first resonant circuit 11 has a first inductor L1 and a capacitor C1, and the second resonant circuit 13 has a second inductor L2 and a capacitor C2. The ground element 1 is configured by partially overlapping the first inductor L1 of the first resonant circuit 11 and the second inductor L2 of the second resonant circuit 13.

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 a bird's-eye view of the ground element 1. As shown in FIG. 2, the first inductor L1 and the second inductor L2 are mounted by printing a spiral coil pattern on the substrate 15, respectively, and their inner regions have a predetermined overlapping width in a top view. It is arranged so as to overlap by the amount of W1. The number of turns of the coil pattern can be appropriately set, and through holes can be formed in the inner layer direction of the substrate 15 to increase the number of turns. The overlap width W1 is defined as a width in 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 top element becomes a predetermined reduced state. The reduced state means a state in which the electromagnetic coupling state between the first inductor L1 and the second inductor L2 at the time of resonance is sufficiently small to be negligible.

Here, the degree of electromagnetic coupling between the first inductor L1 and the second inductor L2 at the time of resonance increases or decreases depending on the overlap width W1. For example, focusing on the magnetic flux generated in the first inductor L1 at the time of resonance, the direction in which the magnetic flux generated in the first inductor L1 penetrates the second inductor L2 is the first of the inner regions of the second inductor L2. The part that overlaps with the inductor L1 (the part surrounded by the one-point chain wire) 131 and the part that does not overlap with the first inductor L1 (the part surrounded by the two-point chain line) 133 are reversed, and the respective parts 131 and 133 This is because the magnetic fluxes cancel each other out and the total sum fluctuates. The same can be said for the direction in which the magnetic flux generated in the second inductor L2 at the time of resonance penetrates the first inductor L1. Therefore, the overlapping width W1 is set so that the sum of the magnetic fluxes of the respective portions 131 and 133 becomes 0 (zero) (or corresponds to 0 (zero)), in other words, the magnetic fluxes of the portion 131 and the portion 133 become equal. If it is 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, electromagnetic field analysis is performed in advance, and the overlap width that makes the electromagnetic coupling state equivalent to zero is defined as the design width. Then, the electromagnetic coupling state is reduced by manufacturing the first inductor L1 and the second inductor L2 so as to overlap each other with an overlapping width W1 that falls within an error range of 5 mm or less with respect to the design width. do. According to this, it is possible to suppress a situation in which the inductors L1 and L2 are electromagnetically coupled at the time of resonance with respect to the transmission signal from the vehicle head element and affect the resonance frequency characteristics (see FIG. 3) of the resonance circuits 11 and 13. Therefore, the information of the combination of the resonance frequencies f1 and f2 can be accurately transmitted to the upper side of the vehicle.

Further, the inductor is manufactured by mounting a pattern such as a copper foil on the substrate 15 instead of the conventional method of manually winding an electric wire. Therefore, the manufacturing variation of the ground element 1 with respect to the overlap width W1 can be suppressed to an error range of 5 mm or less with respect to the design width, and the high-quality ground element that reliably resonates at two specific resonance frequencies f1 and f2. Mass production can be easily and realistically realized.

Capacitors C1 and C2 have required capacitance values corresponding to the corresponding resonance frequencies f1 and f2. For example, two inductors corresponding to different resonance frequencies are selected from a plurality of types (for example, nine types) of capacitor elements having different resonance frequencies prepared in advance and mounted on the ground element 1 and connected to the inductors L1 and L2. Can be used. Alternatively, a plurality of types of capacitor elements may be mounted on the ground element 1 and selectively connected to the inductors L1 and L2 via a switch that selects or combines the capacitor elements.

According to this, by changing the capacitors C1 and C2 without changing the inductors L1 and L2, it is possible to easily configure the ground element 1 that resonates at two desired resonance frequencies f1 and f2. Since the substrate 15 on which the inductors L1 and L2 are mounted can be commonly used, it is also advantageous in terms of cost for manufacturing the substrate 15. Therefore, the ground element 1 can transmit the information indicated by the combination of different resonance frequencies f1 and f2 to the upper side of the vehicle. 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 resonant circuits is two (N = 2) and the number of prepared capacitor elements is nine (M = 9), 36 types of information can be transmitted.

The ground element 1 configured as described above has the rail 3 in a direction in which the arrangement directions of the inductors L1 and L2 arranged so as to be overlapped with a predetermined overlapping width W1 intersect with the train traveling direction (direction along the rails 3 and 3). , Installed between 3 spaces. Therefore, when the on-board element passes above the ground element, the ground element simultaneously resonates with the transmitted signal from the on-board element at two types of resonance frequencies, the first resonance frequency f1 and the second resonance frequency f2. do.

FIG. 3 outlines the resonance frequency characteristics of the ground element 1 and the transmission signal transmitted by the on-board element to detect the resonance frequencies f1 and f2. As shown in FIG. 3, on-board coil outputs a synthesized signal in a predetermined frequency band including a plurality of frequency components F _L to F _H as a transmission signal. Frequency band _F L to F _H is appropriately set within a range of 50KHz～300kHz. Therefore, on the upper side of the vehicle, by analyzing the frequency signal generated in the on-board element when the ground element 1 resonates with respect to the transmitted signal, two types of resonance frequencies f1 and f2 having a large amplitude can be obtained from the resonance frequency characteristic of the ground element 1. It can be detected almost at the same time.

As described above, according to the present embodiment, the first resonance circuit 11 that resonates at the first resonance frequency f1 and the second resonance circuit that resonates at the second resonance frequency f2 with respect to the transmission signal from the on-board element. It is possible to realize the ground element 1 provided with the resonance circuit 13 of 2. Then, the first inductor L1 and the second inductor L2 can be partially overlapped with each other in a direction intersecting the train traveling direction with a predetermined overlapping width W1. According to this, 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 upper side of the vehicle at once, so that the amount of information that can be transmitted can be increased by the combination. Therefore, the information indicated by the combination can be reliably transmitted to the upper side of the vehicle at one time.

In the above-described embodiment, the ground element 1 including the two resonance circuits 11 and 13 has been described, but the ground element may also be provided with the 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 provided with the three resonance circuits. Each of the inductors L11, L12, and L13 is composed of a spiral coil pattern as in FIG. 2, but in FIG. 4, it is abbreviated by a rectangular thick solid line. Similar 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 arranged so as to travel by train with respect to the inductors L11 and L12. They are arranged so as to partially overlap in the direction. In the ground element of FIG. 4, for example, the inductor L11 is arranged so that the inner region indicated by hatching in FIG. 4 partially overlaps the other two inductors L12 and L13. Also in the case of this modification, the design width in which all the electromagnetic coupling states between the inductors L11, L12, and L13 at the time of resonance with respect to the transmission signal from the on-vehicle element are equivalent to zero is defined in advance, and the design width is set with respect to the design width. 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, as in FIG. 2, the inductors L11, L12, and L13 are manufactured by mounting a pattern such as a copper foil on the substrate. In this case, for example, if there are 9 types of resonance frequencies (M = 9) and three different resonance frequencies are combined without allowing duplication, the total number is ₉ C ₃ types (84 types). , 84 kinds of information can be transmitted.

Further, in the above-described embodiment, the first inductor L1 and the second inductor L2 are arranged so as to partially overlap each other with a predetermined overlapping 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 so as to be partially overlapped with a predetermined overlapping width along the train traveling direction.

1 Ground element, 11 1st resonant circuit, L1 1st inductor, C1 capacitor, 13 2nd resonant circuit, L2 2nd inductor, C2 capacitor, 15 substrate, f1 1st resonant frequency, f2 2nd Resonance frequency, W1, W11, W13 Overlapping width, 3 rails, 5 blinds

Claims (6)

A variable frequency or resonant ground element whose resonance frequency is detected by the on-board element by resonating with a transmission signal transmitted by the on-board element of the train.
A first resonant circuit that resonates with the transmitted signal at a first resonant frequency,
A second resonant circuit that resonates with the transmitted signal at a second resonant frequency different from the first resonant frequency.
Equipped with a,
The first inductor that constitutes the first resonant circuit and the second inductor that constitutes the second resonant circuit are the first inductor and the second inductor that resonate with the transmitted signal. The electromagnetic coupling state between the two is partially overlapped with a predetermined overlap width so as to be a predetermined reduction state.
A ground element capable of simultaneously detecting the first resonance frequency and the second resonance frequency when the on-vehicle element transmits one transmission signal. The first inductor and the second inductor are configured by pattern mounting on a substrate.
The ground element according to claim 1 , wherein the substrate is built-in. The width of the predetermined reduction state is within an error range of 5 mm or less with respect to the predetermined design width that makes the electromagnetic coupling state equivalent to zero.
The ground element according to claim 1 or 2. The first resonance circuit and the second resonance circuit are made of passive elements configured so that the resonance frequency can be changed by changing the capacitor without changing the first inductor and the second inductor. It is a circuit that does not require a power supply depending on the circuit configuration.
The ground element according to any one of claims 1 to 3. The transmission signal is a composite 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 be resonated within the frequency band by changing the capacitor.
The ground element according to claim 4. The first inductor and the second inductor are partially overlapped with each other in the direction intersecting the train traveling direction with the predetermined overlapping width.
The ground element according to any one of claims 1 to 5.

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