U.S. patent application number 17/298048 was filed with the patent office on 2022-04-28 for onboard control device, wayside coil, ground control device, wireless train control system, and train location correction method.
This patent application is currently assigned to Mitsubishi Electric Corporation. The applicant listed for this patent is Mitsubishi Electric Corporation. Invention is credited to Mototsugu KOZAKI, Atsushi TAKAMI.
Application Number | 20220126898 17/298048 |
Document ID | / |
Family ID | 1000006120927 |
Filed Date | 2022-04-28 |
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United States Patent
Application |
20220126898 |
Kind Code |
A1 |
KOZAKI; Mototsugu ; et
al. |
April 28, 2022 |
ONBOARD CONTROL DEVICE, WAYSIDE COIL, GROUND CONTROL DEVICE,
WIRELESS TRAIN CONTROL SYSTEM, AND TRAIN LOCATION CORRECTION
METHOD
Abstract
An onboard control device includes an obtaining unit to obtain
information from a wayside coil, for identifying a location of the
wayside coil, and a control unit to correct train location
information, or not, on a basis of correction permission
information, the permission information being associated with the
wayside coil and including information that indicates whether
correction to the train location information is permissible. When
the permission information indicates that the correction is
permissible, the control unit corrects the train location
information by using the wayside coil information at the time when
the onboard pickup coil has passed through the wayside coil, and
when the permission information indicates that the correction is
not permissible, the control unit does not correct the train
location information at the time when the onboard pickup coil has
passed through the wayside coil.
Inventors: |
KOZAKI; Mototsugu; (Tokyo,
JP) ; TAKAMI; Atsushi; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Mitsubishi Electric Corporation |
Chiyoda-ku, Tokyo |
|
JP |
|
|
Assignee: |
Mitsubishi Electric
Corporation
Chiyoda-ku, Tokyo
JP
|
Family ID: |
1000006120927 |
Appl. No.: |
17/298048 |
Filed: |
December 3, 2018 |
PCT Filed: |
December 3, 2018 |
PCT NO: |
PCT/JP2018/044389 |
371 Date: |
May 28, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B61L 25/025 20130101;
B61L 15/0072 20130101; B61L 3/121 20130101; B61L 15/0036
20130101 |
International
Class: |
B61L 25/02 20060101
B61L025/02; B61L 15/00 20060101 B61L015/00; B61L 3/12 20060101
B61L003/12 |
Claims
1. An onboard control device to be installed along with an onboard
pickup coil in a train, the onboard control device comprising:
obtaining circuitry to obtain wayside coil information from a
wayside coil through the onboard pickup coil, the wayside coil
information being capable of identifying a location of the wayside
coil; and control circuitry to correct train location information,
or not to correct the train location information on a basis of
correction permission information, the train location information
indicating a location of the train, the correction permission
information being associated with the wayside coil, the correction
permission information including information that indicates whether
correction to the train location information is permissible,
wherein when the information included in the correction permission
information indicates that the correction is permissible, the
control circuitry corrects the train location information by using
the wayside coil information at a time when the onboard pickup coil
has passed through the wayside coil, and when the information
included in the correction permission information indicates that
the correction is not permissible, the control circuitry does not
correct the train location information at a time when the onboard
pickup coil has passed through the wayside coil.
2. The onboard control device according to claim 1, wherein the
obtaining circuitry obtains wayside-coil location information and
the correction permission information from the wayside coil through
the onboard pickup coil, the wayside-coil location information
being the wayside coil information and indicating a location where
the wayside coil is installed, and the control circuitry corrects a
front-part location of the train by using the wayside-coil location
information when first information indicating whether correction to
a front-part location of the train is permissible indicates that
the correction is permissible, the first information being included
in the correction permission information, and the control circuitry
does not correct a front-part location of the train when the first
information indicates that the correction is not permissible.
3. The onboard control device according to claim 1, comprising
storage circuitry to store therein correspondence information in
which wayside-coil identification information is associated with
the correction permission information, the wayside-coil
identification information being capable of identifying the wayside
coil, wherein the obtaining circuitry obtains, from the wayside
coil through the onboard pickup coil, the wayside-coil
identification information that is the wayside coil information,
the control circuitry searches the correspondence information by
using the wayside-coil identification information obtained from the
wayside coil, and when first information indicating whether
correction to a front-part location of the train is permissible
indicates that the correction is permissible, the control circuitry
corrects a front-part location of the train on a basis of
wayside-coil location information, the first information being
included in the correction permission information, the wayside-coil
location information indicating a location where the wayside coil
is installed, and when the first information indicates that the
correction is not permissible, the control circuitry does not
correct a front-part location of the train, and the wayside-coil
location information is obtained along with the wayside-coil
identification information from the wayside coil, or is included in
the correspondence information.
4. The onboard control device according to claim 1, wherein the
obtaining circuitry obtains, from the wayside coil through the
onboard pickup coil, wayside-coil identification information that
is the wayside coil information, the wayside-coil identification
information being capable of identifying the wayside coil, the
control circuitry obtains, from a ground control device,
correspondence information in which the wayside-coil identification
information is associated with the correction permission
information, and searches the correspondence information by using
the wayside-coil identification information obtained from the
wayside coil, and when first information indicating whether
correction to a front-part location of the train is permissible
indicates that the correction is permissible, the control circuitry
corrects a front-part location of the train on a basis of
wayside-coil location information, the first information being
included in the correction permission information, the wayside-coil
location information indicating a location where the wayside coil
is installed, and when the first information indicates that the
correction is not permissible, the control circuitry does not
correct a front-part location of the train, and the wayside-coil
location information is obtained along with the wayside-coil
identification information from the wayside coil, or is included in
the correspondence information.
5. The onboard control device according to claim 2, wherein when
second information indicating whether correction to a rear-part
location of the train is permissible indicates that the correction
is permissible, the control circuitry corrects a rear-part location
of the train on a basis of the wayside-coil location information,
the second information being included in the correction permission
information, and when the second information indicates that the
correction is not permissible, the control circuitry does not
correct a rear-part location of the train.
6. A wayside coil to communicate with an onboard pickup coil at a
time when a train having the onboard pickup coil installed therein
passes through the wayside coil, the wayside coil comprising:
storage circuitry to store therein wayside-coil location
information and correction permission information, the wayside-coil
location information indicating a location where the wayside coil
is installed, the correction permission information including
information that indicates whether correction to train location
information is permissible for the train, the train location
information indicating a location of the train in the train; and
communication circuitry to transmit, to the train, the correction
permission information and the wayside-coil location information
that is wayside coil information.
7. The wayside coil according to claim 6, wherein the correction
permission information includes first information indicating
whether correction to a front-part location of the train is
permissible.
8. The wayside coil according to claim 6, wherein the correction
permission information includes first information indicating
whether correction to a front-part location of the train is
permissible, and second information indicating whether correction
to a rear-part location of the train is permissible.
9. A ground control device to control an operation of a train that
communicates with a wayside coil through an onboard pickup coil,
the ground control device comprising: storage circuitry to store
therein correspondence information in which wayside-coil
identification information is associated with correction permission
information, the wayside-coil identification information being
capable of identifying the wayside coil, the correction permission
information including information that indicates whether correction
to train location information is permissible for the train, the
train location information indicating a location of the train; and
control circuitry to execute control to transmit the correspondence
information to the train.
10. The ground control device according to claim 9, wherein the
correction permission information includes first information
indicating whether correction to a front-part location of the train
is permissible.
11. The ground control device according to claim 9, wherein the
correction permission information includes first information
indicating whether correction to a front-part location of the train
is permissible, and second information indicating whether
correction to a rear-part location of the train is permissible.
12. The ground control device according to claim 9, wherein when
the control circuitry obtains, from the train, train location
information indicating a location of the train, the control
circuitry executes control to determine a path and a stop-limit
position of the train on a basis of the train location information,
search for a wayside coil present on a path extending from a
rear-part location of the train to the stop-limit position, and
transmit, to the train, correspondence information associated with
a wayside coil detected as a consequence of search.
13. The ground control device according to claim 9, wherein when
the control circuitry obtains the wayside-coil identification
information from the train, the control circuitry executes control
to transmit correspondence information to the train, the
correspondence information including correction permission
information associated with the obtained wayside-coil
identification information.
14. A wireless train control system comprising: an onboard control
device to be installed along with an onboard pickup coil in a
train; and the wayside coil according to claim 6, wherein the
onboard control device comprises: obtaining circuitry to obtain
wayside coil information from the wayside coil through the onboard
pickup coil, the wayside coil information being capable of
identifying a location of the wayside coil; and control circuitry
to correct train location information, or not to correct the train
location information on a basis of correction permission
information, the train location information indicating a location
of the train, the correction permission information being
associated with the wayside coil, the correction permission
information including information that indicates whether correction
to the train location information is permissible, wherein when the
information included in the correction permission information
indicates that the correction is permissible, the control circuitry
corrects the train location information by using the wayside coil
information at a time when the onboard pickup coil has passed
through the wayside coil, and when the information included in the
correction permission information indicates that the correction is
not permissible, the control circuitry does not correct the train
location information at a time when the onboard pickup coil has
passed through the wayside coil.
15. A wireless train control system comprising: an onboard control
device to be installed along with an onboard pickup coil in a
train; and the ground control device according to claim 9, wherein
the onboard control device comprises: obtaining circuitry to obtain
wayside coil information from a wayside coil through the onboard
pickup coil, the wayside coil information being capable of
identifying a location of the wayside coil; and control circuitry
to correct train location information, or not to correct the train
location information on a basis of correction permission
information, the train location information indicating a location
of the train, the correction permission information being
associated with the wayside coil, the correction permission
information including information that indicates whether correction
to the train location information is permissible, wherein when the
information included in the correction permission information
indicates that the correction is permissible, the control circuitry
corrects the train location information by using the wayside coil
information at a time when the onboard pickup coil has passed
through the wayside coil, and when the information included in the
correction permission information indicates that the correction is
not permissible, the control circuitry does not correct the train
location information at a time when the onboard pickup coil has
passed through the wayside coil.
16.-20. (canceled)
21. The onboard control device according to claim 3, wherein when
second information indicating whether correction to a rear-part
location of the train is permissible indicates that the correction
is permissible, the control circuitry corrects a rear-part location
of the train on a basis of the wayside-coil location information,
the second information being included in the correction permission
information, and when the second information indicates that the
correction is not permissible, the control circuitry does not
correct a rear-part location of the train.
22. The onboard control device according to claim 4, wherein when
second information indicating whether correction to a rear-part
location of the train is permissible indicates that the correction
is permissible, the control circuitry corrects a rear-part location
of the train on a basis of the wayside-coil location information,
the second information being included in the correction permission
information, and when the second information indicates that the
correction is not permissible, the control circuitry does not
correct a rear-part location of the train.
Description
FIELD
[0001] The present invention relates to an onboard control device
including an onboard pickup coil, a wayside coil, a ground control
device, a wireless train control system, and a train location
correction method.
BACKGROUND
[0002] A known train traveling on a track detects its train
location and transmits information on the train location to a
wayside device. The wayside device controls the operation of the
train on the basis of the train location obtained from the train.
One of the detection methods, which a train carries out for
detecting its current train location, is to connect a rate
generator to an axle of the train, calculate a traveling distance
from a predetermined reference location on the basis of an output
pulse signal generated by rotation of the axle, and detect the
current train location by using the calculated traveling distance.
Unfortunately, the detection method as described above may include
an error between the actual traveling distance and the calculated
traveling distance due to wheel slipping or skidding during
travelling of the train.
[0003] According to technique disclosed in Patent Literature 1, an
additional length extending from a front part of the train in the
traveling direction and an additional length extending from a rear
part of the train in a direction opposite to the traveling
direction are provided on the basis of a measurement error. A
location of the train location is then detected regarding a
location of the train having these additional lengths as the train
location. The train described in Patent Literature 1 transmits, to
a wayside device, information on the location of the train with the
additional lengths provided on the basis of the measurement
error.
CITATION LIST
Patent Literature
[0004] Patent Literature 1: Japanese Patent Application Laid-open
No. 2007-331629
SUMMARY
Technical Problem
[0005] In general, when an onboard pickup coil installed in a train
receives wayside-coil location information transmitted from a
wayside coil installed on the wayside, the train corrects a train
location on the basis of the the wayside-coil location information.
When the train described in Patent Literature 1 receives location
information transmitted from the wayside coil, the train brings the
additional length provided on the basis of the measurement error to
0. That is, at the point in time when the train corrects its train
location, a phenomenon in which the location having been regarded
as a front-part location of the train is displaced rearward by the
added measurement error occurs. As a result of the correction to
the train location, a stop-limit position of the train shifts from
a position past a signal back to a position before the signal in
which case, the wayside device changes indication of the signal
from "go" to "stop". This is a problem because a sudden change in
the indication of the signal from "go" to "stop" causes the train
to be urgently stopped.
[0006] The present invention has been achieved to solve the above
problem, and an object of the present invention is to provide an
onboard control device capable of controlling correction to a train
location.
Solution to Problem
[0007] To solve the above problem and achieve the object, the
present invention provides an onboard control device to be
installed along with an onboard pickup coil in a train. The onboard
control device comprising: an obtaining unit to obtain wayside coil
information from a wayside coil through the onboard pickup coil,
the wayside coil information being capable of identifying a
location of the wayside coil; and a control unit to correct train
location information, or not to correct the train location
information on a basis of correction permission information, the
train location information indicating a location of the train, the
correction permission information being associated with the wayside
coil, the correction permission information including information
that indicates whether correction to the train location information
is permissible, wherein when the information included in the
correction permission information indicates that the correction is
permissible, the control unit corrects the train location
information by using the wayside coil information at a time when
the onboard pickup coil has passed through the wayside coil, and
when the information included in the correction permission
information indicates that the correction is not permissible, the
control unit does not correct the train location information at a
time when the onboard pickup coil has passed through the wayside
coil.
Advantageous Effects of Invention
[0008] The onboard control device according to the present
invention has an effect that it is possible to control the
correction to the train location.
BRIEF DESCRIPTION OF DRAWINGS
[0009] FIG. 1 is a diagram illustrating a configuration example of
a wireless train control system according to a first
embodiment.
[0010] FIG. 2 is a block diagram illustrating a configuration
example of a wayside coil according to the first embodiment.
[0011] FIG. 3 is a block diagram illustrating a configuration
example of a train according to the first embodiment.
[0012] FIG. 4 is a diagram illustrating an example of correction
permission information to be transmitted by a wayside coil 20a
according to the first embodiment.
[0013] FIG. 5 is a diagram illustrating an example of correction
permission information to be transmitted by a wayside coil 20b
according to the first embodiment.
[0014] FIG. 6 is a flowchart illustrating an operation of an
onboard control device according to the first embodiment.
[0015] FIG. 7 is a flowchart illustrating an operation of the
wayside coil according to the first embodiment.
[0016] FIG. 8 is a diagram illustrating an example of a case where
a processing circuitry included in the onboard control device
according to the first embodiment is configured by a processor and
a memory.
[0017] FIG. 9 is a diagram illustrating an example of a case where
the processing circuitry included in the onboard control device
according to the first embodiment is configured by dedicated
hardware.
[0018] FIG. 10 is a block diagram illustrating a configuration
example of a train according to a second embodiment.
[0019] FIG. 11 is a diagram illustrating an example of
correspondence information stored in a storage unit in an onboard
control device according to the second embodiment.
[0020] FIG. 12 is a flowchart illustrating an operation of the
onboard control device according to the second embodiment.
[0021] FIG. 13 is a flowchart illustrating an operation of a
wayside coil according to the second embodiment.
[0022] FIG. 14 is a block diagram illustrating a configuration
example of a ground control device according to a third
embodiment.
[0023] FIG. 15 is an explanatory diagram for describing operations
of a train and the ground control device according to the third
embodiment.
[0024] FIG. 16 is a flowchart illustrating an operation of an
onboard control device according to the third embodiment.
[0025] FIG. 17 is a flowchart illustrating an operation of the
ground control device according to the third embodiment.
[0026] FIG. 18 is a flowchart illustrating an operation by which a
control unit in the ground control device according to the third
embodiment searches for a wayside coil.
DESCRIPTION OF EMBODIMENTS
[0027] An onboard control device, a wayside coil, a ground control
device, a wireless train control system, and a train location
correction method according to embodiments of the present invention
will be described in detail below with reference to the
accompanying drawings. The present invention is not limited to the
embodiments.
First Embodiment
[0028] FIG. 1 is a diagram illustrating a configuration example of
a wireless train control system 100 according to a first embodiment
of the present invention. The wireless train control system 100
includes trains 10a and 10b, wayside coils 20a and 20b, and a
ground system 30. Where appropriate, the trains 10a and 10b are
hereinafter referred to as trains 10 without being distinguished
from each other. The train 10 may be made up of a plurality of
vehicles, or a single vehicle. Where appropriate, the wayside coils
20a and 20b are hereinafter referred to as "wayside coils 20"
without being distinguished from each other.
[0029] The train 10 has an onboard pickup coil installed therein as
described later. The train 10 is capable of correcting a calculated
location of the train 10, by using information intended for
location correction. The information intended for location
correction is obtained from the wayside coil 20 through the onboard
pickup coil. The train 10 transmits train location information to
the ground system 30. The train location information indicates the
location of the train 10. In the wireless train control system 100,
the ground system 30 obtains train location information from the
train 10, determines a path and a stop-limit position of the train
10 on the basis of the train location information on the train 10,
and controls the operation of the train 10. While in FIG. 1, the
number of trains 10 is two, this is merely an example. The ground
system 30 is capable of controlling the operation of one train 10
or more than two trains 10.
[0030] The configuration of the ground system 30 is described
below. The ground system 30 includes a wireless device 40, a ground
control device 50, and an electronic interlocking device 60.
[0031] The wireless device 40 wirelessly communicates with the
train 10. Specifically, the wireless device 40 receives train
location information from the train 10, and transmits, to the train
10, control information generated by the ground control device
50.
[0032] The ground control device 50 controls the operation of the
train 10 that communicates with the wayside coil 20 through an
onboard pickup coil. On the basis of train location information
obtained from the train 10, the ground control device 50 determines
a path and a stop-limit position of the train 10, and generates
control information for the train 10.
[0033] On the basis of train location information on the train 10
obtained from the ground control device 50, the electronic
interlocking device 60 determines on which of track circuits 81 to
85 the train 10 is present. The electronic interlocking device 60
then controls signals 71 and 72.
[0034] In the wireless train control system 100, at the time when
the train 10 having an onboard pickup coil installed therein passes
through the wayside coil 20, the wayside coil 20 communicates with
the onboard pickup coil. A configuration of the wayside coil 20 is
described below. FIG. 2 is a block diagram illustrating a
configuration example of the wayside coil 20 according to the first
embodiment. The wayside coil 20 includes a storage unit 21 and a
communication unit 22. The wayside coils 20a and 20b are identical
in configuration to each other, although the wayside coils 20a and
20b have different pieces of information stored in their storage
units 21.
[0035] The storage unit 21 stores therein wayside-coil location
information and correction permission information. The wayside-coil
location information indicates the location where the wayside coil
20 is installed. The correction permission information includes
information indicating whether it is permissible for the train 10
to correct train location information. The train location
information indicates the location of the train 10 in the train 10.
The wayside-coil location information is wayside coil information
capable of identifying the location where the wayside coil 20 is
installed. The correction permission information, which is
associated with the wayside coil 20, includes information that
indicates whether correction to train location information
indicating the location of the train 10 is permissible.
[0036] The communication unit 22 transmits, to the train 10, the
wayside-coil location information that is the wayside coil
information, and the correction permission information, both of
which are stored in the storage unit 21.
[0037] A configuration of the train 10 is described below. FIG. 3
is a block diagram illustrating a configuration example of the
train 10 according to the first embodiment. The train 10 includes
an onboard pickup coil 11, a tachometer generator 12, a
communication unit 13, and an onboard control device 14. The train
10 has these devices installed therein. The onboard control device
14 includes an obtaining unit 15 and a control unit 16. The trains
10a and 10b are identical in configuration to each other.
[0038] The onboard pickup coil 11 communicates with the wayside
coil 20. The onboard pickup coil 11 obtains, from the wayside coil
20, wayside coil information capable of identifying the location
where the wayside coil 20 is installed, and correction permission
information. In the first embodiment, the wayside coil information
is wayside-coil location information that indicates the location
where the wayside coil 20 is installed.
[0039] The tachometer generator 12 is connected to an axle of the
train 10, and outputs a pulse signal in response to rotation of the
axle.
[0040] The communication unit 13 wirelessly communicates with the
ground system 30. The communication unit 13 transmits, to the
ground system 30, train location information on the train 10
calculated by the onboard control device 14. The communication unit
13 receives, from the ground system 30, control information for the
train 10 to move or stop.
[0041] The onboard control device 14 controls the operation of the
train 10. The onboard control device 14 calculates the location of
the train 10, by using a signal output from the tachometer
generator 12. The onboard control device 14 can correct the
calculated location of the train 10, by using wayside coil
information obtained from the wayside coil 20 through the onboard
pickup coil 11.
[0042] The obtaining unit 15 obtains wayside coil information and
correction permission information from the wayside coil 20 through
the onboard pickup coil 11.
[0043] The control unit 16 calculates the location of the train 10,
by using a signal output from the tachometer generator 12. The
control unit 16 can correct the calculated location of the train 10
in accordance with the correction permission information, by using
the wayside coil information obtained from the wayside coil 20
through the obtaining unit 15 and the onboard pickup coil 11.
Specifically, when information included in the correction
permission information indicates that correction is permissible,
the control unit 16 corrects the train location information by
using the wayside coil information at the time when the onboard
pickup coil 11 has passed through the wayside coil 20. When
information included in the correction permission information
indicates that correction is not permissible, the control unit 16
does not correct the train location information at the time when
the onboard pickup coil 11 has passed through the wayside coil
20.
[0044] Operations of the trains 10a and 10b are described next.
[0045] In the train 10a, the control unit 16 in the onboard control
device 14 calculates a train location of the train 10a on the basis
of a signal output from the tachometer generator 12. Unfortunately,
there is a possibility that wheel slipping or skidding may cause an
error in the train location of the train 10a. To address this, the
control unit 16 in the train 10a provides allowances for the length
of the train 10a. That is, the control unit 16 regards a length of
the train 10a as being larger than the real length. Specifically,
the control unit 16 in the train 10a adds a front-part allowance
length 91a to the front part of the train 10a, and adds a rear-part
allowance length 92a to the rear part of the train 10a. As a
result, the train 10a travels, having the front part of the train
10a deemed to be located the front-part allowance length 91a ahead
of the real location of the front part of the train 10a. The train
10a travels, having the rear part of the train 10a deemed to be
located the rear-part allowance length 92a behind the real location
of the rear part of the train 10a. The train 10a transmits, to the
ground system 30, the location information on the train with the
front-part allowance length 91a and the rear-part allowance length
92a added. The ground control device 50 in the ground system 30
performs a process of determining, for example, a path and a
stop-limit position on the basis of the transmitted train location
information. The control unit 16 in the train 10a is capable of
changing the front-part allowance length 91a and the rear-part
allowance length 92a depending on the traveling distance since the
last correction to the train location. For example, the control
unit 16 in the train 10a increases the front-part allowance length
91a and the rear-part allowance length 92a in proportion to the
traveling distance since the last correction to the train
location.
[0046] In FIG. 1, the wayside coil 20a is more distant from the
next station than the wayside coil 20b is, and is not close to the
signals 71 and 72. It is thus believed that there are no problems
with the train 10a even when the location of the train 10a is
suddenly changed correcting the train location at the time when the
train 10a has passed through the wayside coil 20a. For this reason,
the wayside coil 20a transmits, to the train 10a, wayside-coil
location information indicating the location where the wayside coil
20a is installed, and correction permission information associated
with the wayside coil 20a, as well.
[0047] FIG. 4 is a diagram illustrating an example of the
correction permission information to be transmitted by the wayside
coil 20a according to the first embodiment. FIG. 4 illustrates a
target for correction to the train location of the train 10a.
Specifically, FIG. 4 shows that the train 10a having passed through
the wayside coil 20a corrects the front-part location of the train
10a, and corrects the rear-part location of the train 10a.
Information included in the correction permission information
illustrated in FIG. 4, that is, information that indicates whether
correction to the front-part location of the train 10a is
permissible is defined as first information, and information that
indicates whether correction to the rear-part location of the train
10a is permissible is defined as second information. Specifically,
in FIG. 4, the first information indicates that the correction
target is the front-part location and correction to the front-part
location is permissible, and the second information indicates that
the correction target is the rear-part location and correction to
the rear-part location is permissible. Whether correction to the
front-part location is permissible is determined on a case-by-case
basis. The correction is determined to be "not permissible", for
example, in a case where there is an installation such as a signal
near the train in the traveling direction of the train 10 and thus
a change in the location of the train 10 probably causes a change
in the state of the installation. Otherwise, the correction is
determined to be "permissible". Whether correction to the rear-part
location is permissible is determined on a case-by-case basis. The
correction is determined to be "not permissible", for example, in a
case where whether the train 10 has a length that allows the train
10 to fit within a facility such as when stopping at a station is
being checked. Otherwise, the correction is determined to be
"permissible".
[0048] The correction permission information to be transmitted from
the wayside coil 20 to the train 10 can be expressed in two bits of
information located at a certain position within a signal
transmitted from the wayside coil 20 to the train 10. For example,
when a first one of the two bits is 1, correction to the front-part
location is permissible. When the first bit is 0, correction to the
front-part location is not permissible. When a second one of the
two bits is 1, correction to the rear-part location is permissible.
When the second bit is 0, correction to the rear-part location is
not permissible.
[0049] At the time when the train 10a has passed through the
wayside coil 20a, the control unit 16 in the train 10a obtains
wayside-coil location information and correction permission
information transmitted from the wayside coil 20a through the
onboard pickup coil 11. The control unit 16 in the train 10a
corrects the front-part location and the rear-part location of the
train 10a on the basis of the obtained wayside-coil location
information and the obtained correction permission information.
Specifically, the control unit 16 in the train 10a resets, that is,
eliminates the front-part allowance length 91a added to the front
part of the train 10a, and also resets, that is, eliminates the
rear-part allowance length 92a added to the rear part of the train
10a. In the manner as described above, the control unit 16 in the
train 10a can accurately acquire the location of the train 10a by
correcting the location of the train 10a at the time when the train
10a has passed through the wayside coil 20a.
[0050] Next, the train 10b is described. The control unit 16 in the
train 10b adds a front-part allowance length 91b to the front part
of the train 10b, and adds a rear-part allowance length 92b to the
rear part of the train 10b. As a result, the train 10b travels,
having the front part of the train 10b deemed to be located the
front-part allowance length 91b ahead of the actual location of the
front part of the train 10b. The train 10b travels, having the rear
part of the train 10b deemed to be located the rear-part allowance
length 92b behind the actual location of the rear part of the train
10b. The train 10b transmits, to the ground system 30, the location
information on the train with the front-part allowance length 91b
and the rear-part allowance length 92b added. The ground control
device 50 in the ground system 30 performs a process of, for
example, determining a path and a stop-limit position on the basis
of the transmitted train location information. The control unit 16
in the train 10b is capable of changing the front-part allowance
length 91b and the rear-part allowance length 92b depending on the
traveling distance since the last correction to the train location.
For example, the control unit 16 in the train 10b increases the
front-part allowance length 91b and the rear-part allowance length
92b in proportion to the traveling distance since the last
correction to the train location.
[0051] In FIG. 1, the wayside coil 20b is less distant from the
next station than the wayside coil 20a is, and is close to the
signals 71 and 72. When the location of the train 10b is suddenly
changed correcting the train location at the time when the train
10b has passed through the wayside coil 20b, the train 10b may
encounter a problem due to such a sudden change. For example, when
the correction to the front-part location of the train 10b changes
the stop-limit position (not illustrated) of the train 10b from a
position between the station and the signals 71 and 72 to a
position before the signals 71 and 72, the electronic interlocking
device 60 suddenly switches indication of one of the signals 71 and
72, which corresponds to the path of the train 10b, from "go" to
"stop". As a consequence, the train 10b needs to suddenly stop due
to a sudden change in the signal indication. For this reason, the
wayside coil 20b transmits, to the train 10b, wayside-coil location
information indicating the location where the wayside coil 20b is
installed, and transmits correction permission information
associated with the wayside coil 20b, as well.
[0052] FIG. 5 is a diagram illustrating an example of the
correction permission information to be transmitted by the wayside
coil 20b according to the first embodiment. FIG. 5 illustrates a
target for correction to the train location of the train 10b.
Specifically, FIG. 5 shows that the train 10b having passed through
the wayside coil 20b does not correct the front-part location of
the train 10b, but corrects the rear-part location of the train
10b. In the correction permission information illustrated in FIG.
5, information that indicates whether correction to the front-part
location is permissible is defined as first information, and
information that indicates whether correction to the rear-part
location is permissible is defined as second information.
Specifically, in FIG. 5, the first information indicates that the
correction target is the front-part location and correction to the
front-part location is not permissible, and the second information
indicates that the correction target is the rear-part location and
correction to the rear-part location is permissible.
[0053] At the time when the train 10b has passed through the
wayside coil 20b, the control unit 16 in the train 10b obtains
wayside-coil location information and correction permission
information transmitted from the wayside coil 20b through the
onboard pickup coil 11. The control unit 16 in the train 10b
corrects the rear-part location of the train 10b, but does not
correct the front-part location of the train 10b on the basis of
the obtained wayside-coil location information and the obtained
correction permission information. Specifically, the control unit
16 in the train 10b does not reset the front-part allowance length
91b added to the front part of the train 10b, but resets, that is,
eliminates the rear-part allowance length 92b added to the rear
part of the train 10b. In this manner, the control unit 16 in the
train 10b can avoid an incident such as a sudden stop of the train
10b by partially correcting the location of the train 10b at the
time when the train 10b has passed through the wayside coil
20b.
[0054] An operation of the onboard control device 14 installed in
the train 10 is described below with reference to a flowchart. FIG.
6 is a flowchart illustrating the operation of the onboard control
device 14 according to the first embodiment. In the onboard control
device 14, the control unit 16 calculates a train location of the
train 10 on the basis of an output signal from the tachometer
generator 12 (Step S1). The control unit 16 determines whether the
obtaining unit 15 has obtained wayside coil information that is
wayside-coil location information indicating the location where the
wayside coil 20 is installed, and correction permission
information, from the wayside coil 20 through the onboard pickup
coil 11 (Step S2).
[0055] When the obtaining unit 15 has obtained the wayside-coil
location information and the correction permission information from
the wayside coil 20 through the onboard pickup coil 11 (YES at Step
S2), the control unit 16 checks whether the first information
included in the correction permission information indicates that
correction is permissible (Step S3). When the first information
indicates that correction is permissible (YES at Step S3), the
control unit 16 corrects the front-part location of the train 10 by
using the wayside-coil location information (Step S4). When the
first information indicates that correction is not permissible (NO
at Step S3), the control unit 16 does not correct the front-part
location of the train 10, that is, omits the process at Step
S4.
[0056] After Step S4 or when the determination at Step S3 is NO,
the control unit 16 checks whether the second information included
in the correction permission information indicates that correction
is permissible (Step S5). When the second information indicates
that correction is permissible (YES at Step S5), the control unit
16 corrects the rear-part location of the train 10 by using the
wayside-coil location information (Step S6). When the second
information indicates that correction is not permissible (NO at
Step S5), the control unit 16 does not correct the rear-part
location of the train 10, that is, omits the process at Step
S6.
[0057] When the determination at Step S2 is NO, or when the
determination at Step S5 is NO, or after Step S6, the control unit
16 transmits train location information on the train 10 including
the front-part location of the train 10 and the rear-part location
of the train 10 to the ground system 30 through the communication
unit 13 (Step S7). The control unit 16 returns to Step S1 to repeat
the operations described above.
[0058] An operation of the wayside coil 20 is described below with
reference to a flowchart. FIG. 7 is a flowchart illustrating the
operation of the wayside coil 20 according to the first embodiment.
The communication unit 22 checks whether the onboard pickup coil 11
in the train 10 has passed through the wayside coil 20, that is,
whether the wayside coil 20 has detected the onboard pickup coil 11
in the train 10 (Step S11). When the wayside coil 20 does not
detect the onboard pickup coil 11 (NO at Step S11), the
communication unit 22 is on standby until the wayside coil 20
detects the onboard pickup coil 11. When the wayside coil 20 has
detected the onboard pickup coil 11 (YES at Step S11), the
communication unit 22 reads wayside-coil location information and
correction permission information from the storage unit 21 and
transmits the read information to the onboard pickup coil 11 (Step
S12). The communication unit 22 returns to Step S11 to repeat the
operations described above.
[0059] The correction permission information stored in the storage
unit 21 in the wayside coil 20 is set in advance by personnel of a
railway operating company in charge, taking nearby installations
into account. Although the correction permission information to be
transmitted from the wayside coil 20 has been described with
reference to FIGS. 4 and 5 as an example, the correction permission
information is not limited thereto. The correction permission
information to be stored in the storage unit 21 in the wayside coil
20 may include, for example, the first information indicating that
correction to the front-part location is permissible, and the
second information indicating that correction to the rear-part
location is not permissible. Alternatively, the correction
permission information may include the first information indicating
that correction to the front-part location is not permissible, and
the second information indicating that correction to the rear-part
location is not permissible. Alternatively, correction permission
information to be stored in the storage unit 21 in the wayside coil
20 may include only the first information, targeting only the
front-part location for correction, or include only the second
information, targeting only the rear-part location for correction.
When the correction permission information includes only the first
information, the control unit 16 in the train 10 omits the
operations at Steps S5 and S6 in the flowchart in FIG. 6. When the
correction permission information includes only the second
information, the control unit 16 in the train 10 omits the
operations at Steps S3 and S4 in the flowchart in FIG. 6.
[0060] Next, a hardware configuration of the onboard control device
14 is described. In the onboard control device 14, the obtaining
unit 15 is an input interface to obtain information received by the
onboard pickup coil 11. The control unit 16 is implemented by a
processing circuitry. It is allowable that the processing circuitry
is either dedicated hardware, or a processor and a memory that
execute programs stored in the memory.
[0061] FIG. 8 is a diagram illustrating an example of a case where
the processing circuitry included in the onboard control device 14
according to the first embodiment is configured by a processor and
a memory. In a case where the processing circuitry is configured by
a processor 201 and a memory 202, the functions of the processing
circuitry of the onboard control device 14 are implemented in
software, firmware, or a combination of the software and the
firmware. The software or the firmware is described as a program
and stored in the memory 202. In the processing circuitry, the
processor 201 reads and executes the program stored in the memory
202 to thereby implement each of the functions. That is, the
processing circuitry includes the memory 202 that stores therein
programs that eventually execute the processing of the onboard
control device 14. These programs are also regarded as causing a
computer to execute the procedure and the method of the onboard
control device 14.
[0062] The processor 201 may be a device such as a CPU (Central
Processing Unit), a processing device, an arithmetic device, a
microprocessor, a microcomputer, or a DSP (Digital Signal
Processor). For example, a nonvolatile or volatile semiconductor
memory such as a RAM (Random Access Memory), a ROM (Read Only
Memory), a flash memory, an EPROM (Erasable Programmable ROM), and
an EEPROM.RTM. (Electrically EPROM), or a magnetic disk, a flexible
disk, an optical disk, a compact disk, a MiniDisk, or a DVD
(Digital Versatile Disc) corresponds to the memory 202.
[0063] FIG. 9 is a diagram illustrating an example of a case where
the processing circuitry included in the onboard control device 14
according to the first embodiment is configured by dedicated
hardware. When the processing circuitry is configured by dedicated
hardware, then for example, a single circuit, a combined circuit, a
programmed processor, a parallel-programmed processor, an ASIC
(Application Specific Integrated Circuit), an FPGA (Field
Programmable Gate Array), or a combination thereof corresponds to a
processing circuitry 203 illustrated in FIG. 9. The functions of
the onboard control device 14 may be respectively implemented by
each individual processing circuitry 203 or may be collectively
implemented by a single processing circuitry 203.
[0064] As for the respective functions of the onboard control
device 14, it is possible to configure that some parts of the
functions are implemented by dedicated hardware and other parts
thereof are implemented by software or firmware. In this manner,
the processing circuitry can implement each function described
above by dedicated hardware, software, firmware, or a combination
of these elements.
[0065] A hardware configuration of the wayside coil 20 is now
described. In the wayside coil 20, the communication unit 22 is a
transmission device to transmit information stored in the storage
unit 21 when the wayside coil 20 detects radio waves and the like
irradiated from the onboard pickup coil 11 in the train 10. The
storage unit 21 is implemented by a memory.
[0066] As described above, according to the present embodiment, in
the train 10, the control unit 16 in the onboard control device 14
obtains wayside-coil location information and correction permission
information from the wayside coil 20, and corrects or does not
correct train location information in accordance with the details
of the correction permission information. This enables the train 10
to control correction to the train location information in
accordance with whether there are facilities in the vicinity of the
wayside coil 20, that is, there is a signal in the above example,
such that it is possible to avoid an incident such as a sudden stop
as a result of a sudden change in the train location
information.
[0067] Although not illustrated in FIG. 1, it is also possible to
additionally install a wayside coil 20 inside a station, so that
the train 10 having passed through the signals 71 and 72 can
correct the train location information, specifically, correct the
front-part location of the train 10 by using the wayside coil 20
installed inside the station.
Second Embodiment
[0068] In the first embodiment, the train 10 obtains correction
permission information from the wayside coil 20. In this case, all
of the trains 10 passing through the wayside coil 20 obtain, from
the wayside coil 20, pieces of correction permission information
that contain the same details, and accordingly correct the train
locations in the same manner. In a second embodiment, a description
is made as to a case in which the train 10 holds correction
permission information therein.
[0069] In the second embodiment, the configuration of the wireless
train control system 100 is identical to that of the wireless train
control system 100 according to the first embodiment illustrated in
FIG. 1. The configuration of the wayside coil 20 is also identical
to that of the wayside coil 20 according to the first embodiment
illustrated in FIG. 2. However, in the second embodiment, the
storage unit 21 has wayside coil information that is wayside-coil
identification information stored therein. The wayside-coil
identification information is capable of identifying the wayside
coil 20. The wayside-coil identification information is, for
example, an ID (IDentification) that can uniquely represent each
wayside coil 20 in the wireless train control system 100. The
communication unit 22 transmits, to the train 10, wayside-coil
identification information stored in the storage unit 21. The
storage unit 21 may have wayside-coil location information stored
therein similarly to the first embodiment. In a case where the
storage unit 21 has wayside-coil location information stored
therein, the communication unit 22 transmits the wayside-coil
location information along with the wayside-coil identification
information.
[0070] FIG. 10 is a block diagram illustrating a configuration
example of the train 10 according to the second embodiment. The
train 10 includes the onboard pickup coil 11, the tachometer
generator 12, the communication unit 13, and the onboard control
device 14. The onboard control device 14 includes the obtaining
unit 15, the control unit 16, and a storage unit 17. The trains 10a
and 10b are identical in configuration. The storage unit 17 stores
therein correspondence information in which wayside-coil
identification information capable of identifying the wayside coil
20 is associated with correction permission information.
[0071] FIG. 11 is a diagram illustrating an example of the
correspondence information stored in the storage unit 17 in the
onboard control device 14 according to the second embodiment. In
the correspondence information illustrated in FIG. 11, the
wayside-coil identification information is an ID that can uniquely
represent each wayside coil 20 in the wireless train control system
100 as described above. In the correspondence information
illustrated in FIG. 11, correction permission information is set
for each wayside-coil identification information, and indicates
whether correction to the train location is permissible. In FIG.
11, information in the field "front-part location" in the
correction permission information corresponds to the first
information, and information in the field "rear-part location" in
the correction permission information corresponds to the second
information. In FIG. 11, the wayside-coil location information
indicates the location where the wayside coil 20 is installed, the
wayside coil 20 being indicated by the wayside-coil identification
information. In a case where the wayside-coil location information
is transmitted from the wayside coil 20, the wayside-coil location
information may be deleted from the correspondence information
illustrated in FIG. 11. The onboard control device 14 may obtain
the wayside-coil location information along with the wayside-coil
identification information from the wayside coil 20, or include the
wayside-coil location information in the correspondence information
stored in the storage unit 17.
[0072] In the second embodiment, when the onboard pickup coil 11 in
the train 10 has passed through the wayside coil 20, the wayside
coil 20 transmits, to the train 10, wayside coil information that
is wayside-coil identification information. The wayside coil 20 may
transmit the wayside-coil location information along with the
wayside-coil identification information similarly to the first
embodiment.
[0073] In the train 10, when the control unit 16 in the onboard
control device 14 obtains wayside-coil identification information
from the wayside coil 20 through the onboard pickup coil 11 and the
obtaining unit 15, the control unit 16 searches the correspondence
information stored in the storage unit 17 on the basis of the
wayside-coil identification information. For example, when the
wayside-coil identification information obtained from the wayside
coil 20 is "A1", the control unit 16 searches the correspondence
information with the wayside-coil identification information "A1",
and obtains correction permission information associated with the
wayside-coil identification information "A1". In the example in
FIG. 11, the control unit 16 obtains correction permission
information indicating that correction to the front-part location
is not permissible, and correction to the rear-part location is
permissible. When the control unit 16 does not obtain wayside-coil
identification information from the wayside coil 20 through the
onboard pickup coil 11 and the obtaining unit 15, the control unit
16 obtains wayside-coil location information "B1" associated with
the wayside-coil identification information "A1" in the example in
FIG. 11. The control unit 16 executes control to correct the
location of the train 10 on the basis of the correction permission
information obtained by searching the correspondence information
and associated with the wayside-coil identification information
"A1".
[0074] The operation of the onboard control device 14 installed in
the train 10 is described below with reference to a flowchart. FIG.
12 is a flowchart illustrating the operation of the onboard control
device 14 according to the second embodiment. In the onboard
control device 14, the control unit 16 calculates a train location
of the train 10 on the basis of an output signal from the
tachometer generator 12 (Step S1). The control unit 16 determines
whether the obtaining unit 15 has obtained wayside-coil
identification information from the wayside coil 20 through the
onboard pickup coil 11 (Step S21).
[0075] When the obtaining unit 15 has obtained wayside-coil
identification information from the wayside coil 20 through the
onboard pickup coil 11 (YES at Step S21), the control unit 16
searches correspondence information stored in the storage unit 17
by using the obtained wayside-coil identification information (Step
S22), and obtains correction permission information associated with
the obtained wayside-coil identification information (Step S23).
The operations at Steps S3 to S7 subsequent to Step S23 are the
same as the operations in the first embodiment illustrated in FIG.
6. However, when the determination at Step S21 is NO, or when the
determination at Step S3 is NO, or when the determination at Step
S5 is NO, or after Step S6, the control unit 16 transmits train
location information on the train 10 to the ground system 30
through the communication unit 13 (Step S7).
[0076] The operation of the wayside coil 20 is described below with
reference to a flowchart. FIG. 13 is a flowchart illustrating the
operation of the wayside coil 20 according to the second
embodiment. The communication unit 22 checks whether the onboard
pickup coil 11 in the train 10 has passed through the wayside coil
20, that is, whether the wayside coil 20 has detected the onboard
pickup coil 11 in the train 10 (Step S31). When the wayside coil 20
does not detect the onboard pickup coil 11 (NO at Step S31), the
communication unit 22 is on standby until the wayside coil 20
detects the onboard pickup coil 11. When the wayside coil 20 has
detected the onboard pickup coil 11 (YES at Step S31), the
communication unit 22 reads wayside-coil identification information
from the storage unit 21 and transmits the read wayside-coil
identification information to the onboard pickup coil 11 (Step
S32). The communication unit 22 returns to Step S31 to repeat the
operations described above.
[0077] The correspondence information stored in the storage unit 17
in the onboard control device 14 is set in advance by personnel of
a railway operating company in charge, taking account of the type
of the train 10, nearby installations, and other factors. In the
correspondence information illustrated in FIG. 11, wayside-coil
identification information and wayside-coil location information
are common to all the trains 10. However, different pieces of
correction permission information may be set for different types of
the train 10. For the wayside coil 20 installed before some station
(defined as "station A"), for example, details of correction
permission information set for a train 10 that is supposed to stop
at the station A are different from those for another train 10 that
is not supposed to stop at the station A. In this case, personnel
of a railway operating company in charge can set different pieces
of correction permission information for different types of the
train 10. Similarly to the correction permission information stored
in the storage unit 21 in the wayside coil 20 according to the
first embodiment, correction permission information stored in the
storage unit 17 in the onboard control device 14 may include only
the first information, targeting only the front-part location for
correction, or may include only the second information, targeting
only the rear-part location for correction.
[0078] In the hardware configuration of the onboard control device
14, the storage unit 17 is implemented by a memory. In the onboard
control device 14, the hardware configuration of the obtaining unit
15 and the control unit 16 is identical to that of the obtaining
unit 15 and the control unit 16 according to the first
embodiment.
[0079] As described above, according to the present embodiment, the
onboard control device 14 in the train 10 holds correction
permission information therein, obtains wayside-coil identification
information from the wayside coil 20, and corrects or does not
correct train location information in accordance with the details
of the correction permission information associated with the
wayside-coil identification information. With this configuration,
the wireless train control system 100 can provide a setting per
wayside coil 20 such that whether correction to the train location
information is permissible is determined in accordance with the
type of the train 10.
Third Embodiment
[0080] In the first embodiment, the train 10 obtains correction
permission information from the wayside coil 20. In the second
embodiment, the train 10 holds correction permission information
therein. In a third embodiment, a description is made as to a case
in which the train 10 obtains correction permission information
from the ground control device 50.
[0081] In the third embodiment, the configuration of the wireless
train control system 100 is identical to that of the wireless train
control system 100 according to the first embodiment illustrated in
FIG. 1. The configuration of the wayside coil 20 is also identical
to that of the wayside coil 20 according to the second embodiment.
The configuration of the train 10 is also identical to that of the
train 10 according to the first embodiment illustrated in FIG. 3.
However, in the third embodiment, the train 10 obtains, from the
ground control device 50, correction permission information in a
form of correspondence information in which the correction
permission information is associated with wayside-coil
identification information.
[0082] FIG. 14 is a block diagram illustrating a configuration
example of the ground control device 50 according to the third
embodiment. The ground control device 50 includes a storage unit 51
and a control unit 52. The storage unit 51 stores therein
correspondence information in which wayside-coil identification
information capable of identifying the wayside coil 20 is
associated with correction permission information. The
correspondence information has the same details as those of the
correspondence information stored in the storage unit 17 in the
onboard control device 14 according to the second embodiment.
Similarly to the second embodiment, in a case where the
wayside-coil location information is transmitted from the wayside
coil 20 to the train 10, the wayside-coil location information may
be deleted from the correspondence information illustrated in FIG.
11. The onboard control device 14 may obtain the wayside-coil
location information along with the wayside-coil identification
information from the wayside coil 20, or include the wayside-coil
location information in the correspondence information obtained
from the ground control device 50.
[0083] FIG. 15 is an explanatory diagram for describing the
operations of the train 10 and the ground control device 50
according to the third embodiment. In the third embodiment, the
control unit 16 in the onboard control device 14 transmits train
location information to the ground system 30 through the
communication unit 13.
[0084] When the control unit 52 in the ground control device 50
obtains train location information from the train 10 through the
wireless device 40, the control unit 52 determines paths 86 and 87
of the train 10 and determines a stop-limit position 88 of the
train 10 on the basis of the train location information obtained
from the train 10. The control unit 52 in the ground control device
50 searches for the wayside coils 20a and 20b present on the paths
86 and 87 extending from the rear-part location of the train 10 to
the stop-limit position 88. The control unit 52 in the ground
control device 50 searches correspondence information stored in the
storage unit 51 on the basis of wayside-coil identification
information on the wayside coils 20a and 20b. For example, when the
wayside-coil identification information on the wayside coil 20a is
"A4", the control unit 52 obtains correspondence information about
the wayside-coil identification information "A4". In the example in
FIG. 11, the control unit 52 obtains correspondence information
that the wayside-coil identification information is "A4",
correction to the front-part location is permissible, and
correction to the rear-part location is permissible. For another
example, when the wayside-coil identification information on the
wayside coil 20b is "A5", the control unit 52 obtains
correspondence information about the wayside-coil identification
information "A5". In the example in FIG. 11, the control unit 52
obtains correspondence information that the wayside-coil
identification information is "A5", correction to the front-part
location is not permissible, but correction to the rear-part
location is permissible. The control unit 52 in the ground control
device 50 executes control to transmit, to the train 10, control
information including the obtained correspondence information.
[0085] The control unit 16 in the train 10 executes control to
correct the location of the train 10 on the basis of the
correspondence information included in the control information
obtained from the ground control device 50. At the time when the
train 10 passes through the wayside coil 20a, the control unit 16
in the train 10 resets, that is, eliminates the front-part
allowance length 91, and resets, that is, eliminates the rear-part
allowance length 92 on the basis of the correspondence information
obtained from the ground control device 50.
[0086] The operation of the onboard control device 14 installed in
the train 10 is described below with reference to a flowchart. FIG.
16 is a flowchart illustrating the operation of the onboard control
device 14 according to the third embodiment. In the onboard control
device 14, the control unit 16 calculates a train location of the
train 10 on the basis of an output signal from the tachometer
generator 12 (Step S1). The control unit 16 determines whether the
obtaining unit 15 has obtained wayside-coil identification
information from the wayside coil 20 through the onboard pickup
coil 11 (Step S41). When the obtaining unit 15 has obtained
wayside-coil identification information from the wayside coil 20
through the onboard pickup coil 11 (YES at Step S41), the control
unit 16 determines whether the obtaining unit 15 has obtained, from
the ground control device 50, correspondence information in which
the wayside-coil identification information is associated with
correction permission information (Step S42). When the obtaining
unit 15 has obtained correspondence information from the ground
control device 50 (YES at Step S42), the control unit 16 searches
the correspondence information by using the wayside-coil
identification information obtained from the wayside coil 20, and
checks whether first information indicates that correction is
permissible, the first information being included in the correction
permission information associated with the wayside-coil
identification information obtained from the wayside coil 20 (Step
S3). The operations at Steps S3 to S7 are the same as the
operations in the first embodiment illustrated in FIG. 6. However,
when the determination at Step S41 is NO, or when the determination
at Step S42 is NO, or when the determination at Step S5 is NO, or
after Step S6, the control unit 16 transmits train location
information on the train 10 to the ground system 30 through the
communication unit 13 (Step S7).
[0087] FIG. 17 is a flowchart illustrating an operation of the
ground control device 50 according to the third embodiment. The
control unit 52 checks whether the ground control device 50 has
obtained train location information from the train 10 (Step S51).
When the ground control device 50 does not obtain train location
information from the train 10 (NO at Step S51), the control unit 52
is on standby until the ground control device 50 obtains train
location information. When the ground control device 50 has
obtained train location information from the train 10 (YES at Step
S51), the control unit 52 determines the paths 86 and 87 of the
train 10 (Step S52) and determines the stop-limit position 88 of
the train 10 (Step S53) on the basis of the train location
information. The control unit 52 searches for the wayside coil 20
present on the path extending from the rear-part location of the
train 10 to the stop-limit position 88 (Step S54). The control unit
52 generates control information including the result of the search
for the wayside coil 20, and transmits the control information to
the train 10 through the wireless device 40 (Step S55).
Specifically, the control unit 52 executes control to transmit, to
the train 10, correspondence information associated with the
wayside coil 20 detected as a consequence of the search. The
control unit 52 in the ground control device 50 repeats the
operations described above.
[0088] The operation of the control unit 52 to search for the
wayside coil 20 at Step S54 in the flowchart illustrated in FIG. 17
is described below in detail. FIG. 18 is a flowchart illustrating
the operation by which the control unit 52 in the ground control
device 50 according to the third embodiment searches for the
wayside coil 20. The control unit 52 in the ground control device
50 searches for the wayside coil 20 present on the paths 86 and 87
extending from the rear-part location of the train 10 to the
stop-limit position 88 (Step S61). When the control unit 52 has
detected the wayside coil 20 (YES at Step S62), the control unit 52
obtains, from the storage unit 51, correspondence information about
wayside-coil identification information on the detected wayside
coil 20, and sets the obtained correspondence information in
control information as a result of the retrieval (Step S63). When
the control unit 52 cannot detect the wayside coil 20 (NO at Step
S62), the control unit 52 sets "no correction permission
information" as a result of the retrieval in the control
information (Step S64).
[0089] The train 10 may detect the wayside coil 20, and transmits,
to the ground control device 50, wayside-coil identification
information obtained from the wayside coil 20. In this case, in the
ground control device 50, the control unit 52 obtains, from the
storage unit 51, correspondence information about the wayside-coil
identification information obtained from the train 10, generates
control information including the obtained correspondence
information, and transmits the generated control information to the
train 10 through the wireless device 40. That is, when the control
unit 52 obtains wayside-coil identification information from the
train 10, the control unit 52 executes control to transmit, to the
train 10, the correspondence information including correction
permission information associated with the obtained wayside-coil
identification information. In the ground control device 50, in a
case where the control unit 52 obtains a single piece of
wayside-coil identification information from the train 10, the
control unit 52 may obtain correction permission information about
the obtained wayside-coil identification information from
correspondence information stored in the storage unit 51, generate
control information including the obtained correction permission
information, and transmit the generated control information to the
train 10 through the wireless device 40.
[0090] The ground control device 50 may have correspondence
information stored in the storage unit 51 in accordance with the
type of the train 10. When the control unit 52 in the ground
control device 50 obtains train location information from the train
10, the control unit 52 also obtains train identification
information capable of identifying the type of the train 10. The
control unit 52 in the ground control device 50 can generate
control information having a setting per wayside coil 20 such that
whether correction to the train location information is permissible
is determined in accordance with the type of the train 10, and can
transmit the generated control information.
[0091] In the hardware configuration of the ground control device
50, the storage unit 51 is implemented by a memory. The control
unit 52 is implemented by a processing circuitry. The processing
circuitry included in the ground control device 50 is of an
identical configuration to the processing circuitry included in the
onboard control device 14 according to the first embodiment.
[0092] As described above, according to the present embodiment, in
the wireless train control system 100, the ground control device 50
holds correction permission information therein. The train 10 can
obtain, from the ground control device 50, correction permission
information associated with the wayside coil 20 present on the
path. In the wireless train control system 100, the ground control
device 50 is the only device that holds correspondence information
therein. In modifying the correction permission information for
each wayside coil 20, therefore, personnel of a railway operating
company in charge only need to modify the data stored in the
storage unit 51 in the ground control device 50. This can help the
personnel do work more efficiently.
[0093] The configurations described in the above embodiments are
only examples of the content of the present invention. The
configurations can be combined with other well-known techniques,
and part of each of the configurations can be omitted or modified
without departing from the scope of the present invention.
REFERENCE SIGNS LIST
[0094] 10, 10a, 10b train, 11 onboard pickup coil, 12 rate
generator, 13, 22 communication unit, 14 onboard control device, 15
obtaining unit, 16, 52 control unit, 17, 21, 51 storage unit, 20,
20a, 20b wayside coil, 30 ground system, 40 wireless device, 50
ground control device, 60 electronic interlocking device, 71, 72
signal, 81 to 85 track circuit, 86, 87 path, 88 stop-limit
position, 91, 91a, 91b front-part allowance length, 92, 92a, 92b
rear-part allowance length, 100 wireless train control system.
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