JP7388938B2 - Railway vehicle speed measurement system, railway vehicle speed measurement device, and railway vehicle speed measurement method - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a technique for measuring the speed of a railway vehicle.

Patent Document 1 discloses that a first reader/writer and a second reader/writer that detect information on an RFID tag installed in a vehicle are installed at an arbitrary distance apart, and the first reader/writer and the second reader/writer are arranged at an arbitrary distance. A technique is disclosed that calculates the average speed of a vehicle from the time difference between detecting vehicle identification information and the distance between a first reader/writer and a second reader/writer.

Japanese Patent Application Publication No. 2008-102916

However, according to the technique disclosed in Patent Document 1, it is necessary to install two reader/writers at a distance from each other on the ground side. This increases the cost of ground-side equipment for speed detection.

Therefore, an object of the present disclosure is to make it possible to measure the speed of a railway vehicle while keeping track-side equipment costs low by using a plurality of RFID tags provided on the railway vehicle.

A speed measurement system for a railway vehicle includes a plurality of RFID tags provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle, and a plurality of RFID tags provided on the track side on which the railway vehicle runs. , an RFID reader that reads tag information from the plurality of RFID tags, a difference in time at which the RFID reader reads the tag information of each of the plurality of RFID tags, and a difference between the plurality of RFID tags in the railway vehicle. and a speed calculation unit that calculates the speed of the railway vehicle based on the distance.

Further, the speed measuring device for a railway vehicle is provided on a track side on which the railway vehicle runs, and includes a plurality of RFIDs provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle. Based on an RFID reader that reads tag information from a tag, a time difference in which the RFID reader reads the tag information of each of the plurality of RFID tags, and a distance between the plurality of RFID tags in the railway vehicle. , a speed calculation unit that calculates the speed of the railway vehicle.

Further, a method for measuring the speed of a railway vehicle includes (a) a step of reading tag information from a plurality of RFID tags provided on a railway vehicle, and (b) a time at which the tag information of each of the plurality of RFID tags is read. and a step of calculating the speed of the railway vehicle based on the difference between the RFID tags and the distance between the plurality of RFID tags in the railway vehicle.

The speed of the railway vehicle is calculated based on the difference in time between reading the tag information of each of the plurality of RFID tags provided on the railway vehicle and the distance between the plurality of RFID tags on the railway vehicle. Therefore, the device for reading the RFID tag on the orbit side is simplified. As a result, the speed of the railway vehicle can be measured while keeping track-side equipment costs low by using a plurality of RFID tags provided on the railway vehicle.

FIG. 1 is an explanatory diagram showing the overall configuration of a speed measurement system according to an embodiment. It is an explanatory view showing the whole composition of the speed measurement system same as the above. FIG. 1 is a block diagram showing a speed measurement system. It is a flowchart which shows the example of a process in a speed calculation device. FIG. 3 is an explanatory diagram conceptually showing a process of calculating speed from a reading list and a tag position table. 12 is a flowchart illustrating a processing example according to a modification. FIG. 2 is an explanatory diagram showing an example of processing for calculating the speed and average speed of a railway vehicle. FIG. 3 is a diagram showing how the speed changes based on a plurality of measured speeds. FIG. 3 is a diagram showing a relationship between a plurality of measured speeds and an approximate expression. FIG. 3 is a block diagram showing an RFID tag according to a modified example. It is a figure showing an example of the installation position of the RFID reader with respect to a track.

Hereinafter, a railway vehicle speed measuring system, a railway vehicle speed measuring device, and a railway vehicle speed measuring method according to embodiments will be described. 1 and 2 are explanatory diagrams showing the overall configuration of a speed measurement system 30 for a railway vehicle. FIG. 1 shows a side view of the railway vehicle 20, and FIG. 2 shows a front view of the railway vehicle 20.

An example of a railway vehicle in which this system is installed will be explained. The railway vehicle 20 runs on the track 18. The track 18 is a path that guides the railway vehicle 20 along a route. Here, the track 18 includes two rails 18a, 18a. The two rails 18a, 18a may be laid in parallel on the ground G via sleepers 19 or the like. The track may be one in which a single rail guides a railway vehicle, such as a monorail. The track may be provided above the ground by a viaduct or the like. The track may be provided in a tunnel dug underground.

The railway vehicle 20 includes a car body 22 and a bogie 24. The truck 24 includes a truck frame 25 and a plurality of wheels 28. The bogie frame 25 includes, for example, a cross beam 25a and a pair of side beams 25b. A pair of side beams 25b are connected in parallel to both ends of the cross beam 25a. A truck frame 25 is provided at the bottom of the vehicle body 22. The plurality of wheels 28 are rotatably supported by the left and right side beams 25b of the bogie frame 25 via axle portions. The part that supports the axle is sometimes called the axle box. In addition, in this embodiment, the advancing direction of the railway vehicle 20 may be referred to as the front side, and the backward direction may be referred to as the rear side. Furthermore, the terms may be referred to as left and right based on the direction of travel seen from the railway vehicle 20. In the direction of gravity, the side on which gravity is applied is sometimes called the lower side, and the opposite side is sometimes called the upper side. The left and right wheels 28 travel on the track 18 while being guided by the two rails 18a, 18a of the track 18. The truck 24 supports the vehicle body 22 from below. As the bogie 24 runs on the track 18, the railway vehicle 20 including the car body 22 runs along the track 18. The railway vehicle 20 may be any vehicle that runs on the track 18, and may be an electric train, a freight train locomotive, a freight car, a passenger train locomotive, or a passenger car. The freight car or the passenger car may be an accompanying car pulled by a locomotive, or may be a motor vehicle that has its own power. The locomotive may be an electric locomotive or an internal combustion engine vehicle such as a diesel locomotive.

The overall configuration of the speed measurement system 30 for the railway vehicle 20 will be described based on the railway vehicle 20 described above. The speed measurement system 30 includes a plurality of RFID (Radio Frequency Identification) tags 34, an RFID reader 40, and a speed calculation device 50 as a speed calculation section.

The plurality of RFID tags 34 are provided in the railway vehicle 20 so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle 20. In other words, the plurality of RFID tags 34 include at least two RFID tags 34 provided at different positions along the longitudinal direction of the railway vehicle 20.

In the example shown in FIG. 1, an RFID tag 34 is provided on each of the front and rear bogies 24 of the railway vehicle 20. Furthermore, in each truck 24, an RFID tag 34 is provided at the front, rear, and longitudinally intermediate portions of the side beams 25b. Therefore, the RFID tags 34 are dispersed at six different positions in the longitudinal direction of the railway vehicle 20. The number of positions where the RFID tags 34 are dispersed in the longitudinal direction of the railway vehicle 20 is arbitrary, and may be 2 or more. The RFID tags 34 may be distributed at three or more positions in the longitudinal direction of the railway vehicle 20.

The plurality of RFID tags 34 may include tags provided at different positions in the width direction of the railway vehicle 20. In the example shown in FIG. 2, an RFID tag 34 is provided on each of the pair of side beams 25b. Further, an RFID tag 34 is also provided at the middle portion in the width direction of the cross beam 25a. For this reason, the RFID tag 34 is provided at each of the left portion, right portion, and middle portion in the width direction of the railway vehicle 20.

Note that the above description is not intended to exclude that some of the plurality of RFID tags 34 are provided at the same position in the longitudinal direction of the railway vehicle 20, and that they are provided at the same position in the left-right direction.

The RFID reader 40 is provided on the track 18 side on which the railway vehicle 20 runs, and is configured to read tag information from the plurality of RFID tags 34. Here, the RFID reader 40 being provided on the track 18 side means that it is provided on the track 18 side in relation to the track 18 and the railway vehicle 20 running on the track 18. For this reason, the RFID reader 40 is installed in a part that does not move together with the railway vehicle 20, for example, on the ground where the rails 18a or sleepers 19 are installed, or on ground facilities (stations for getting on and off people or loading and unloading goods, etc.). It's okay to be hit.

Here, the RFID reader 40 includes an RFID reader main body 42 and an antenna 41. Antenna 41 is provided at any position along orbit 18. The antenna 41 may be provided at a position where the tag information of the RFID tag 34 attached to the railway vehicle 20 running on the track 18 can be read by wireless communication. When the railway vehicle 20 passes near the antenna 41 along the track 18, the RFID reader main body 42 reads tag information from the RFID tag 34 attached to the railway vehicle 20 through the antenna 41. For example, the antenna 41 may be provided between the pair of rails 18a and on both outer sides of the pair of rails 18a. This makes it easy to read the tag information of the RFID tags 34 provided on the left and right portions and the middle portion in the width direction of the railway vehicle 20. When a plurality of antennas 41 are provided, the plurality of antennas 41 may be provided at the same position in the longitudinal direction of the track 18. Thereby, the plurality of antennas 41 can read the tag information of the RFID tag 34 at the same position in the longitudinal direction of the track 18. The tag information read by the RFID reader 40 is given to the speed calculation device 50.

The RFID reader 40 and the RFID tag 34 may communicate using, for example, radio waves in the UHF (Ultra High Frequency) band. In this case, the RFID tag 34 can be read by the RFID reader 40 installed at a relatively long distance (for example, 2 m) from the passage of the railway vehicle 20.

The speed calculation device 50 is configured to calculate the speed of the railway vehicle 20 based on the tag information of the plurality of RFID tags 34 read by the RFID reader 40. More specifically, the speed calculation device 50 calculates the speed based on the difference in time when the RFID reader 40 reads the tag information of each of the plurality of RFID tags 34 and the distance between the plurality of RFID tags 34 in the railway vehicle 20. , calculates the speed of the railway vehicle 20. In other words, the time when the RFID reader 40 reads the tag information of the tag 34 can be specified by a time measurement unit (RTC (real time clock)) included in any one of the RFID tag 34, the RFID reader 40, and the speed calculation device 50. Further, the distance between the plurality of RFID tags 34 can be a known value if the positions of the RFID tags 34 attached to the railway vehicle 20 are managed. If the reading time difference of the RFID tags 34 attached to different positions in the longitudinal direction of the railway vehicle 20 and the distance between the RFID tags 34 are specified, the speed of the railway vehicle 20 is determined by dividing the distance by the time difference. is required.

The speed calculation device 50 determines whether or not to issue a warning based on the calculated speed of the railway vehicle 20, etc., and when it is determined that a warning should be issued, issues a warning through the warning section 60. Good too. The alarm unit 60 may be provided at a position that is visible from the railway vehicle 20. For example, the alarm unit 60 may be provided at a position along the track 18 and downstream from the RFID reader 40 in the traveling direction of the railway vehicle 20. The alarm section 60 may be provided at a position where the alarm can be issued to the driver of the railway vehicle 20, such as around the driver's cab. The alarm unit 60 may be provided at a location where it can issue an alarm to the manager, such as a management base of the railway system.

The speed measurement device 32 of the railway vehicle 20 may be understood as a device including the RFID reader 40 and the speed calculation device 50 as a speed calculation section.

An example of each part of the speed measurement system 30 will be described in more detail. FIG. 3 is a block diagram illustrating a speed measurement system 30. As shown in FIG.

An ID is assigned to the RFID tag 34. The RFID tag 34 is configured to be able to transmit tag information including its own ID via radio waves. The RFID tag 34 may include a tag control section 35, an antenna 38, and a storage section 37. The tag control unit 35 is composed of a processor such as a CPU (Central Processing Unit). The storage unit 37 is constituted by a nonvolatile memory such as EEPROM (electrically erasable and programmable read only memory). The storage unit 37 stores tag control programs, IDs, and the like. The tag control unit 35 executes the processing described in the tag control program stored in the storage unit 37. Thereby, the RFID tag 34 executes a process of transmitting tag information including its own ID. The RFID tag 34 may be a passive tag that operates by being powered by electromagnetic waves from the RFID reader 40 or the like, or an active tag that operates using a built-in battery as a power source.

The RFID tag 34 may be a tag with a state detection function that detects states such as deformation, displacement, and temperature of a target part in the railway vehicle 20. In this case, it is preferable that the RFID tag detects the state of the railway vehicle 20 based on the output from the sensor that detects the state, and transmits the state information included in the tag information. The sensor may be provided on the RFID tag 34 or may be a sensor provided on the railway vehicle 20 and connected to the RFID tag 34. If the RFID tag 34 has a state detection function, the speed of the railway vehicle 20 can be measured at low cost by using the RFID tag 34 with the state detection function.

Note that the railway vehicle 20 may be a single vehicle or may be a plurality of connected vehicles. That is, the plurality of RFID tags 34 used for speed measurement only need to be attached to one or more vehicles running on the track 18 as one unit.

The RFID reader 40 includes the RFID reader main body 42 and the antenna 41, as described above. The RFID reader main body 42 is configured by a computer including a processor such as a CPU, a storage section, and the like. The storage unit stores a reading control program and the like. A processor executes a process written in a reading control program stored in a storage unit, and executes a process of reading tag information. For example, the RFID reader 40 intermittently wirelessly transmits a response command through the antenna 41. The time between response commands transmitted intermittently may be constant. If one or more RFID tags 34 are present at a position where they can wirelessly receive the response command from the antenna 41, the one or more RFID tags 34 wirelessly return tag information. This allows the RFID reader 40 to wirelessly receive tag information of one or more RFID tags 34. Assuming that a plurality of RFID tags 34 reply simultaneously, the communication function between the RFID reader 40 and the RFID tag 34 may have an anti-collision function. Anti-collision can be achieved, for example, by the RFID reader 40 issuing a response command to a plurality of RFID tags 34 by specifying slots in which it can reply, and further issuing a response command excluding the IDs of the RFID tags 34 that have already responded. , is a process of shifting the timing of replies from multiple RFID tags 34. Other processes may be employed as anti-collision. In any case, if the RFID tag 34 is located in a position where it can receive the wireless signal transmitted from the antenna 41, each time a response command is wirelessly transmitted from the RFID reader 40 through the antenna 41, the RFID reader 40 41, tag information from one or more RFID tags 34 is read at once.

The RFID reader main body 42 has a clock section 42a that ticks the time (for example, an RTC that ticks the current time), and the tag information received by the RFID reader 40 is checked by the reception time (reading time) measured by the clock section 42a. It may also be provided to the speed calculation device 50 in association with the following. Thereby, the tag information read from the RFID tag 34 can be processed in association with the reading time. The tag information transmitted from the RFID tag 34 may include a time based on a timer built into the RFID tag 34, and the reading time of the tag information may be specified based on the time. Further, the tag information reading time may be specified based on the time measured by a timer built into the speed calculation device 50.

The speed calculation device 50 is constituted by a computer including a calculation processing device 52, a storage section 53, a RAM (Random Access Memory), and the like. Here, the speed calculation device 50 is installed on the ground and is communicably connected to the RFID reader 40 in a wired manner. The arithmetic processing unit 52 is composed of a processor such as a CPU (Central Processing Unit). The storage unit 53 is constituted by a nonvolatile storage device such as an HDD (hard disk drive) or an SSD (solid-state drive). The storage unit 53 stores a speed calculation program 53a, a tag position table 53b, a reading list 53c, a speed history 53d, a reference speed 53e, and the like. The arithmetic processing unit 52 executes the processing described in the speed calculation program 53a stored in the storage unit 53. Thereby, the speed calculation device 50 determines whether the railway vehicle 20 Speed can be calculated. An example of the processing of the speed calculation device 50 will be described in more detail later.

The tag position table 53b is information that associates IDs with position information of the RFID tags 34. The mounting position of the RFID tag 34 is grasped as a known value from information grasped and managed as, for example, the designed mounting position of the RFID tag 34 in the railway vehicle 20 or the mounting position during work. The mounting position of the RFID tag 34 may be expressed, for example, as a coordinate based on the railway vehicle 20, particularly as a position on a coordinate axis along at least the longitudinal direction of the railway vehicle 20. The reading list 53c is information that associates IDs with reading times of the RFID tags 34. The reading list 53c is generated based on the ID included in the tag information read by the RFID reader 40 and the reading time. The speed history 53d is history information of the calculated speed of the railway vehicle 20. The speed history 53d may be information in which the calculated speed is associated with at least one of time (reading time) and ID. If there is a separate table or the like that associates IDs with railroad vehicles 20, the speed history 53d may be information in which specific information of the railroad vehicle 20 is associated with the calculated speed. The reference speed 53e is a value set in advance as the upper limit speed of the railway vehicle 20 on the track 18. The storage unit 53 may also store an ID list 53f that associates IDs with status information and the like.

The speed calculation device 50 may be realized by a single computer, or may be configured by a plurality of computers working together. In these cases, the installation position of the computer is not particularly limited. One or more computers may be mounted on the railway vehicle 20, may be installed near equipment where the RFID reader 40 is installed, or may be installed in another base system. A plurality of computers may be distributed and installed at each of these locations. When this system is realized by a plurality of computers, each process described below may be executed by any of the computers.

In this embodiment, the speed measurement system 30 includes the alarm unit 60 as described above. The alarm section 60 issues a warning when the speed of the railway vehicle 20 calculated by the speed calculation device 50 matches a warning condition. The notification may be made visually. An example of the alarm unit 60 is a revolving light 60a. Another example of the alarm unit 60 is a liquid crystal display device. The alarm unit 60 may be a display device 60b installed at a fixed location, or may be a portable display device 60c (for example, a smartphone, a tablet terminal device). The alarm may be made aurally by a sounding body such as a speaker or a buzzer.

FIG. 4 is a flowchart showing an example of processing in the speed calculation device 50. FIG. 5 is an explanatory diagram conceptually showing the process of calculating speed from the reading list 53c and the tag position table 53b.

In step S1, the speed calculation device 50 determines whether tag information has been read based on the output from the RFID reader 40. When the railway vehicle 20 passes near the installation location of the RFID reader 40 on the track 18, the tag information of the RFID tag 34 attached to the railway vehicle 20 is read by the RFID reader 40. The process of step S1 is repeated until it is determined that reading has occurred, and when it is determined that reading has occurred, the process advances to the next step S2.

In step S2, the ID included in the read tag information is registered in the reading list 53c along with the reading time.

In the next step S3, it is determined whether the railway vehicle 20 has passed near the RFID reader 40 or not. For example, it is determined whether or not the time during which the reading of tag information by the RFID reader 40 is interrupted is at least a preset predetermined time or exceeds a predetermined time, and when the time during which reading is interrupted is at least a predetermined time or exceeds a predetermined time. It may be determined that the railway vehicle 20 has already passed. The determination as to whether the railway vehicle 20 has passed may be made based on the output of a vehicle detection sensor, such as an optical sensor, separately provided near the track 18. If it is determined that the vehicle has not passed, the process returns to step S1, and if it is determined that the vehicle has passed, the process proceeds to step S4.

In step S4, a combination for speed calculation is determined from among the plurality of IDs registered in the reading list 53c. Here, one combination is made up of two IDs. In this embodiment, a case will be described in which one combination for speed calculation is determined, and in a later modification, an example in which a plurality of combinations are determined will be described. The combination for speed calculation is not particularly limited. For example, the combination for speed calculation may be two IDs set in advance, two IDs randomly extracted from a plurality of IDs, or an ID with the fastest reading time. and the slowest ID.

In the next step S5, for the two IDs constituting the combination for speed calculation, the tag reading time is read from the reading list 53c, and the coordinates are read from the tag position table 53b. For example, in the example shown in FIG. 5, in the reading list 53c, each ID is associated with a reading time, and in the tag position table 53b, each ID is associated with coordinates (coordinates in the longitudinal direction of the railway vehicle 20). ing. Therefore, the reading time and coordinates are specified for each ID based on the reading list 53c and the tag position table 53b.

In the next step S6, speed calculation is performed. In this speed calculation, the speed of the railway vehicle 20 is calculated based on the difference in time between reading the tag information of the two IDs for speed calculation and the distance between the two RFID tags 34. The difference in the time taken to read the tag information of the two IDs for speed calculation can be found by subtracting the reading time of the two IDs read from the reading list 53c from one of the reading times of the other. The distance between the two RFID tags 34 is calculated based on the position information of the RFID tags 34. Here, the distance between the two RFID tags 34 can be determined by subtracting one of the coordinates of the two IDs from the other based on the tag position table 53b. Then, the speed of the railway vehicle 20 is calculated by dividing the distance between the RFID tags 34 by the difference in reading time of the RFID tags 34.

For example, in FIG. 5, when calculating speed based on IDs 001 and 027 and the RFID tag 34, the distance can be calculated by subtracting the coordinates of one ID (027) from the other ID (001). can be found. Here, for example, the distance is determined to be 2470 (cm) from 2590 (cm) - 0120 (cm) = 2470 (cm). Further, by subtracting the reading time of the other ID (001) from the reading time of one ID (027), the reading time difference can be determined. Here, for example, the reading time difference is determined to be 78 (s) from 0083 (s) - 0005 (s) = 78 (s). Then, by dividing the distance by the time difference, it is possible to calculate 2470/78=31.666 (cm/s). The above calculation result indicates the speed at which the portion of the railway vehicle 20 to which the two IDs (001 and 027) are attached passes by the side of the RFID reader 40. The calculated speed is displayed on the display unit, stored as a speed history, and sent as a warning to the railway vehicle.

In the next step S7, the calculated speed is registered as the speed history 53d.

In the next step S8, it is determined whether the calculated speed matches a warning condition. The warning condition is, for example, that the speed is equal to or higher than a predetermined reference speed 53e, or that the speed exceeds the reference speed 53e. If it is determined that the speed does not meet the warning conditions, the process proceeds to step S10, and if it is determined that the speed does meet the warning conditions, the process proceeds to step S9.

In step S9, a warning process is performed through the warning unit 60. The warning process is performed by, for example, generating a display or sound to call attention through the alarm unit 60. After the processing, the process advances to step S10.

In step S10, it is determined whether there is an end command. If it is determined that there is a termination command, the process is terminated, and if it is determined that there is no termination command, the process returns to step S1 and the subsequent processes are repeated. By repeating the process from step S1 onward, the speed of the railway vehicle 20 equipped with the RFID tag 34 is measured each time the railway vehicle 20 passes near the RFID reader 40.

According to the present embodiment, the speed of the railway vehicle 20 is determined based on the difference in time when the RFID reader 40 reads the tag information of each of the plurality of RFID tags 34 and the distance between the plurality of RFID tags 34 in the railway vehicle 20. Calculate. Therefore, compared to the case where multiple RFID readers are installed on the ground side and the speed is determined based on the reading time of the RFID tag by each RFID reader and the distance between the RFID readers, the number of installed RFID readers 40 is reduced. can do. Thereby, the speed of the railway vehicle 20 can be measured using the plurality of RFID tags 34 provided on the railway vehicle 20 while keeping equipment costs on the track 18 side low. Note that a plurality of RFID readers may be provided for preliminary purposes or accuracy improvement purposes.

Further, the speed calculation device 50 calculates the distance between two RFID tags 34 based on the position information of the plurality of RFID tags 34 in the railway vehicle 20 (here, the coordinates in the longitudinal direction of the railway vehicle 20). Therefore, the distance between a plurality of RFID tags 34 can be easily determined without having to manage and understand the inter-tag distances for all combinations of RFID tags 34.

Further, a tag position table 53b is stored in the speed calculation device 50. The speed calculating device 50 calculates the distance between the plurality of RFID tags 34 based on this tag position table 53b. Therefore, even if position information is not registered in the RFID tags 34, the distance between the plurality of RFID tags 34 can be calculated using the tag position table 53b.

Further, when the speed calculated by the speed calculation device 50 matches the warning conditions, a warning is issued through the alarm unit 60, so the calculated speed information can be used for operation, operation management, etc. of the railway vehicle 20. . For example, if the speed is equal to or higher than a predetermined upper limit speed, a warning can be issued to the driver or the like.

FIG. 6 is a flowchart showing a processing example according to a modified example in the speed calculation device 50. In FIG. 6, on the premise that three or more RFID tags 34 are attached to the railway vehicle 20, the speed calculation device 50 calculates the speed of the railway vehicle 20 for multiple combinations of the three or more RFID tags. An example of calculating velocity is shown. An average speed may be calculated or a speed change may be calculated based on a plurality of speeds calculated for a plurality of combinations. FIG. 6 shows a case where the average speed is calculated. Note that the cases in which three or more RFID tags 34 are attached to the railway vehicle 20 include cases in which all three or more RFID tags 34 are attached at different positions in the longitudinal direction of the railway vehicle 20, and Three or more RFID tags 34 are distributed at two or more different positions along the longitudinal direction of the railway vehicle 20, and at least two RFID tags 34 are at the same position in the longitudinal direction of the railway vehicle 20 (for example, left and right positions) Including when it is attached to.

The process shown in FIG. 6 is different from the process shown in FIG. 4 because in FIG. 4, the speed related to one combination of RFID tags 34 is determined, whereas in FIG. This is the point to find the speed. The processing shown in FIG. 6 will be described with a focus on differences from the processing shown in FIG. 4. In the process shown in FIG. 6, the same processes as steps S1 to S3 shown in FIG. 4 are performed, and if it is determined that the process has passed in step S3, the process proceeds to step S21 instead of step S4 in FIG.

In step S21, a plurality of combinations for speed calculation are determined from among the plurality of IDs registered in the reading list 53c. One combination is made up of two IDs. In this modification, a plurality of combinations for speed calculation are determined. The plurality of combinations may be determined by any process. For example, the multiple combinations may be all combinations that can be generated using multiple IDs. The plurality of combinations may be a plurality of preset combinations. A plurality of combinations may be determined by repeatedly extracting two IDs at random from a plurality of IDs and excluding those that result in the same combination. Note that there may be a case where some of the plurality of IDs result in a reading error by the RFID reader 40. In such a case, the following process may be performed. For example, after determining a combination of two IDs, if one or both of the determined two IDs is determined to be a reading error, that combination is excluded and a combination of another two IDs is determined. You may. Alternatively, IDs for which reading errors have occurred may be excluded from the IDs to be extracted for determining combinations. When a plurality of combinations for speed calculation are determined, the process proceeds to the next step S5.

In steps S5 and S6, the speed of the railway vehicle 20 is calculated for one of the determined combinations of IDs for speed calculation in the same manner as described with reference to FIG. Once the speed calculation has been performed, the process proceeds to step S22 instead of step S7 shown in FIG.

In step S22, it is determined whether speed calculations have been completed for all of the plurality of combinations determined in step S21. If it is determined that the speed calculation has not been completed, the process returns to step S5, and the process of calculating the speed is repeated for the combinations for which the speed calculation has not been completed. If it is determined that the velocity calculation has been completed, the process advances to step S23.

In step S23, the average speed of the railway vehicle 20 is calculated based on the plurality of calculated speeds. That is, the sum of a plurality of speeds is calculated, and the sum is divided by the number of combinations. This determines the average speed. The process based on the plurality of calculated speeds may not be the process of calculating the average speed. For example, as shown later, the plurality of speeds may be processed as data indicating changes in speed of the railway vehicle 20.

After the processing in step S23, the processing shown in steps S7 to S10 shown in FIG. 4 is performed.

According to this modification, the speed of the railway vehicle 20 is calculated for multiple combinations of three or more RFID tags 34, so it is possible to improve the speed accuracy of the railway vehicle. Alternatively, it is possible to determine speed changes.

For example, it is possible to improve the speed accuracy of the railway vehicle 20 by determining multiple speeds of the railway vehicle 20 for multiple combinations of three or more RFID tags 34 and determining the average value of the multiple speeds. can. That is, when the RFID tag 34 enters the communicable area of the RFID reader 40, the RFID reader 40 can read the RFID tag 34. However, depending on the surrounding conditions (actual speed of the railway vehicle 20, acceleration/deceleration conditions, weather), the attachment state (posture, etc.) of the RFID tags 34 to the RFID reader 40, the number of RFID tags 34 that have entered the communicable area, etc. The relative position of the RFID tag 34 with respect to the RFID reader 40 when the RFID reader 40 reads the RFID tag 34 may vary. When multiple speeds of the railway vehicle 20 are determined for multiple combinations of three or more RFID tags 34 and an average value of the multiple speeds is determined, the relative positional deviation of the RFID tags 34 with respect to the RFID reader 40 is will cancel each other out. Therefore, the influence of relative positional fluctuations of the RFID tag 34 with respect to the RFID reader 40 is suppressed on the calculated average speed, and the speed accuracy of the railway vehicle 20 is improved.

Furthermore, if a plurality of RFID tags 34 are distributed at three or more different positions in the longitudinal direction of the railway vehicle 20, the RFID reader 40 will read each RFID tag 34 under the reading conditions (time, position, etc.). . Therefore, when calculating the average value of a plurality of speeds, relative positional deviations of the RFID tag 34 with respect to the RFID reader 40 are easily canceled out, and the speed accuracy of the railway vehicle 20 is improved.

Further, if three or more RFID tags 34 are provided at different positions in the width direction of the railway vehicle 20, the RFID reader 40 can be operated under different conditions in the width direction of the railway vehicle 20 (the RFID tags 34 for the RFID reader 40 The RFID tag 34 is read in the attached state (posture, etc.). Therefore, when calculating the average value of a plurality of speeds, relative positional deviations of the RFID tag 34 with respect to the RFID reader 40 are easily canceled out, and the speed accuracy of the railway vehicle 20 is improved.

An example of processing for calculating the speed and average speed of the railway vehicle 20 based on the reading times of the four RFID tags 34 provided on the railway vehicle 20 will be described with reference to FIG. 7 . Two bogies 24 are provided at the front and rear of the railway vehicle 20. It is assumed that RFID tags 34 are provided on the front and rear axle boxes of the front and rear carts 24, respectively. That is, four RFID tags 34 are provided in the railway vehicle 20. It is assumed that numbers 1, 2, 3, and 4 are assigned to the four RFID tags 34 from the front to the rear. Below, when distinguishing the RFID tags 34, they may be written as RFID tags 34(1), 34(2), 34(3), and 34(4). The coordinates of the RFID tags 34 (1), 34 (2), 34 (3), and 34 (4) (coordinates in the longitudinal direction of the railway vehicle 20) are X ₁ and X ₂ with the front end of the railway vehicle 20 as the starting point. , X ₃ , and X ₄ , and the reading times are t ₁ , t ₂ , t ₃ , and t ₄ . In the following description, the speed between the RFID tags 34(a) and RFID tags 34(a) will be expressed as v _ab .

In this case, the speed between the RFID tags 34(1) and 34(2) is v ₁₂ =(x ₂ −x ₁ )/(t ₂ −t ₁ ), and the speed between the RFID tags 34(1) and 34(3) is The speed between the RFID tags 34(1) and 34(4) is v ₁₃ =(x ₃ -x ₁ )/(t ₃ -t ₁ ), and the speed between the RFID tags 34(1) and 34(4) is v ₁₄ =(x ₄ -x ₁ )/(t ₄ - t ₁ ), and the speed between the RFID tags 34 (2) and 34 (3) is v ₂₃ = (x ₃ - x ₂ )/(t ₃ - t ₂ ), and the RFID tag 34 (2), The speed between the RFID tags 34(3) and 34(4) is v ₂₄ = (x ₄ - x ₂ )/(t ₄ - t ₂ ), and the speed between the RFID tags 34(3) and 34(4) is v ₃₄ = (x ₄ - x ₃ )/(t ₄ −t ₃ ).

Further, the average speed V _AVG is (v ₁₂ +v ₁₃ +v ₁₄ +v ₂₃ +v ₂₄ +v ₃₄ )/6.

When multiple speeds are calculated, as shown in FIG. A plurality of speeds may be generated as data indicating changes in the speed of the railway vehicle 20, assuming that the speed of the railway vehicle 20 is the speed of the railway vehicle 20 at the time (which may be an average value of the reading time). Thereby, the speed change of the railway vehicle 20 can be easily grasped. The acceleration of the railway vehicle 20 is determined from this speed change data.

In this case, the warning condition in step S8 shown in FIG. 6 may be defined as the acceleration being out of a certain range. For example, a warning may be issued when the acceleration exceeds a predetermined acceleration (or above a predetermined acceleration) or when the acceleration is less than a predetermined acceleration (or below a predetermined acceleration). Thereby, a warning can be issued when the railway vehicle is suddenly accelerated or decelerated.

Furthermore, when a plurality of velocities are calculated, as shown in FIG. 9, interpolation processing may be performed to obtain an approximate expression f(t) based on a plurality of discrete data indicating velocities relative to time. The interpolation process can be realized by various algorithms employing Lagrangian interpolation, spline interpolation, least squares approximation, and the like.

In the above embodiment, an example has been described in which the position of the RFID tag 34 is registered in the storage section 53 of the speed calculation device 50 as the tag position table 53b. However, like the RFID tag 134 shown in the modification shown in FIG. 10, the ID 137a and position information 137b may be registered in the storage unit 137 of the RFID tag 134. The position information 137b is information indicating the position where the RFID tag 134 is attached in the railway vehicle 20. When the RFID reader 40 reads the tag information of the RFID tag 134, by reading the ID and position information, similarly to the above embodiment, the distance between the plurality of RFID tags 134 is calculated, and the speed of the railway vehicle 20 is calculated. Can be calculated.

Irrespective of the description in the above embodiment, the installation position of the RFID reader 40 is not particularly limited as long as it is a position that is provided on the running railway vehicle 20 and can read the RFID tag 34. For example, the RFID reader 40 may be provided near a location where the railway vehicle 20 travels at low speed.

FIG. 11 shows an example in which the track 18 includes a branch track 110 and a terminal stop position 112. The branch trajectory 110 is a portion where the trajectory branches into a plurality of trajectories, and includes a portion called a point. The terminal stop position 112 is a position where the railway vehicle 20 stops before the terminal end 113 of the track 18. Also shown in FIG. 11 is a station 114 provided along the track 18. The station 114 is a facility for people to get on and off the railway vehicle 20 or for loading and unloading goods.

The RFID reader 140a is provided at a position to read the RFID tag 34 provided on the railway vehicle 20 passing through the branch track 110. Here, the RFID reader 140a is provided on the side of the track section that is the branch source on the premise that the railway vehicle 20 travels from the branch source track section to the branch destination track. Then, when the railroad vehicle 20 travels on the branch track 110, the railroad vehicle 20 passes by the RFID reader 140a, and the RFID reader 140a reads the RFID tag 34 provided on the railroad vehicle 20. In this case, the alarm section 160a is preferably provided on the downstream side in the traveling direction of the railway vehicle 20 than the RFID reader 140a. Thereby, when the railway vehicle 20 passes through the branch track 110, the speed is measured by the speed calculation device 50. Further, it is determined whether or not the measured speed matches a warning condition, and if the measured speed matches the warning condition, a warning is issued through the alarm unit 160a. The warning condition is appropriately set according to the radius of curvature of the branch trajectory 110, etc.

Further, the RFID reader 140b is provided at a position to read the RFID tag 34 provided on the railway vehicle 20 traveling toward the terminal stop position 112 of the track 18. Here, the RFID reader 140b is provided at a position on the side of the track 18 before the terminal stop position 112. Therefore, when the railway vehicle 20 travels toward the terminal stop position 112, the RFID reader 140b reads the RFID tag 34 provided on the railway vehicle 20. In this case, the alarm section 160b is preferably provided on the downstream side in the traveling direction of the railway vehicle 20 than the RFID reader 140b. Thereby, when the railway vehicle 20 travels toward the terminal stop position 112, the speed is measured by the speed calculation device 50. Further, it is determined whether or not the measured speed matches a warning condition, and if the measured speed matches the warning condition, a warning is issued through the alarm unit 160b. The warning condition is a slow speed at which the railway vehicle 20 can stop without exceeding the terminal end 113, and is set according to the weight of the railway vehicle 20, the number of connections, etc.

Further, the RFID reader 140c is provided at a position to read the RFID tag 34 provided on the railway vehicle 20 traveling toward the stop position at the station 114. Here, the RFID reader 140c is provided at a side position of the entrance portion of the portion of the track 18 corresponding to the station. Therefore, when the railway vehicle 20 travels toward the stop position of the station 114, the RFID reader 140c reads the RFID tag 34 provided on the railway vehicle 20. In this case, the alarm section 160c is preferably provided on the downstream side in the traveling direction of the railway vehicle 20 than the RFID reader 140c. Thereby, when the railway vehicle 20 travels toward the stop position at the station 114, the speed is measured by the speed calculation device 50. Further, it is determined whether or not the measured speed matches the warning condition, and if the measured speed matches the warning condition, a warning is issued through the alarm unit 160c. The warning condition is a slow speed at which the railway vehicle 20 can stop without exceeding the station 114, and is set according to the weight of the railway vehicle 20, the number of connections, etc.

Note that the configurations described in the above embodiment and each modification can be combined as appropriate as long as they do not contradict each other.

The above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations not illustrated can be envisaged without departing from the scope of the invention.

The present disclosure includes the following aspects.

A first aspect includes a plurality of RFID tags provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle, and a plurality of RFID tags provided on the track side on which the railway vehicle runs, an RFID reader that reads tag information from a plurality of RFID tags, a difference in time at which the RFID reader reads the tag information of each of the plurality of RFID tags, and a distance between the plurality of RFID tags in the railway vehicle. A speed measurement system for a railway vehicle, comprising: a speed calculation unit that calculates the speed of the railway vehicle based on the speed calculation unit. As a result, the speed of the railway vehicle is calculated based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags installed on the railway vehicle and the distance between the plurality of RFID tags on the railway vehicle. . Therefore, the number of RFID readers installed on the track side can be reduced. This makes it possible to measure the speed of a railway vehicle while keeping track-side equipment costs low by using a plurality of RFID tags installed on the railway vehicle.

A second aspect is the speed measurement system for a railway vehicle according to the first aspect, in which the speed calculation unit is configured to measure the speed of a railway vehicle based on position information of the plurality of RFID tags in the railway vehicle. This is a speed measurement system for railway vehicles that calculates the distance between RFID tags. Thereby, the distance between the plurality of RFID tags can be easily calculated based on the position information of the plurality of RFID tags in the railway vehicle.

A third aspect is the speed measurement system for a railway vehicle according to the second aspect, in which a tag position table associates IDs of the plurality of RFID tags with position information of the plurality of RFID tags in the railway vehicle. The railway vehicle speed measurement system further includes a storage unit storing the following information, and the speed calculation unit calculates a distance between the plurality of RFID tags in the railway vehicle based on the tag position table. Thereby, the distance between multiple RFID tags can be calculated using the tag position table without registering position information in the RFID tags.

A fourth aspect is the railway vehicle speed measurement system according to any one of the first to third aspects, wherein the plurality of RFID tags include three or more of the RFID tags, and the speed calculation unit is , a speed measurement system for a railway vehicle that calculates the speed of the railway vehicle for a plurality of combinations of the three or more RFID tags. Thereby, it becomes possible to obtain the speed change of the railway vehicle based on the plurality of calculated speeds. Alternatively, it is possible to obtain a highly accurate speed based on a plurality of calculated speeds.

A fifth aspect is the railway vehicle speed measurement system according to the fourth aspect, in which the speed calculation unit is configured to calculate the speed of the railway vehicle calculated for a plurality of combinations of the three or more RFID tags. This is a railway vehicle speed measurement system that calculates the average speed of a railway vehicle. The position at which the RFID reader detects the RFID tag may vary. By setting the average speed to the speed of the railway vehicle, variations in the detection position of the RFID tag with respect to the RFID reader are canceled out, and the speed of the railway vehicle can be measured with high accuracy.

A sixth aspect is the railway vehicle speed measurement system according to the fourth or fifth aspect, wherein the three or more RFID tags are distributed at three or more different positions along the longitudinal direction of the railway vehicle. This is a speed measuring system for a railway vehicle, which is installed in the railway vehicle to do so. Thereby, a plurality of speeds of the railway vehicle are determined based on the reading time of tag information from the RFID tags corresponding to three or more different positions in the longitudinal direction of the railway vehicle, the distance between the tags, and the like. In particular, when the average speed of the railway vehicle is calculated, variations in the detection position of the RFID tag relative to the RFID reader in the longitudinal direction of the railway vehicle are canceled out.

A seventh aspect is the railway vehicle speed measurement system according to any one of the fourth to sixth aspects, wherein the three or more RFID tags are provided at different positions in the width direction of the railway vehicle. including As a result, a plurality of speeds of the railway vehicle are determined at different positions in the width direction of the railway vehicle. In particular, when the average speed of the railway vehicle is calculated, variations in the detection position of the RFID tag with respect to the RFID reader in the width direction of the railway vehicle are canceled out.

An eighth aspect is the speed measurement system for a railway vehicle according to any one of the fourth to seventh aspects, wherein the speed calculation unit performs calculations on a plurality of combinations of the three or more RFID tags. The present invention is a railway vehicle speed measuring system that outputs speed change information of the railway vehicle based on the speed of the railway vehicle that has been determined. Thereby, changes in the speed of the railway vehicle can be measured.

A ninth aspect is the railway vehicle speed measurement system according to any one of the fourth to eighth aspects, in which when the speed of the railway vehicle calculated by the speed calculation section matches a warning condition. It further includes an alarm unit that issues a warning. Thereby, a warning can be issued when the speed of the railway vehicle matches the warning condition.

A tenth aspect is the speed measurement system for a railway vehicle according to any one of the first to ninth aspects, wherein the track includes a branch track, and the RFID reader is connected to the railway passing through the branch track. It is installed at a position to read RFID tags installed in vehicles. Thereby, the speed of the rail vehicle can be measured when the rail vehicle passes through the branch track.

An eleventh aspect is the railway vehicle speed measurement system according to any one of the first to ninth aspects, wherein the RFID reader is provided in a railway vehicle traveling toward a terminal stop position of the track. It is installed at a position to read RFID tags. Thereby, the speed of the railway vehicle can be measured when the railway vehicle travels toward the terminal stop position.

The speed measuring device for a railway vehicle according to a twelfth aspect is provided on a track side on which the railway vehicle runs, and is provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle. an RFID reader that reads tag information from a plurality of RFID tags, a difference in the time at which the RFID reader reads the tag information of each of the plurality of RFID tags, and a distance between the plurality of RFID tags in the railway vehicle. and a speed calculation unit that calculates the speed of the railway vehicle based on the above. In this case, the speed of the railway vehicle is calculated based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags installed on the railway vehicle and the distance between the plurality of RFID tags on the railway vehicle. . Therefore, the number of RFID readers installed on the track side can be reduced. This makes it possible to measure the speed of a railway vehicle while keeping track-side equipment costs low by using a plurality of RFID tags installed on the railway vehicle.

A thirteenth aspect is the railway vehicle speed measuring device according to the twelfth aspect, in which the speed calculation unit measures the speed of the plurality of RFID tags in the railway vehicle based on position information of the plurality of RFID tags in the railway vehicle. This is a speed measurement device for railway vehicles that calculates the distance between RFID tags. Thereby, the distance between the plurality of RFID tags can be easily calculated based on the position information of the plurality of RFID tags in the railway vehicle.

A fourteenth aspect is the speed measurement device for a railway vehicle according to the twelfth or thirteenth aspect, wherein the speed calculation unit is configured to measure the speed of a railway vehicle by measuring a plurality of combinations of three or more RFID tags provided on the railway vehicle. On the other hand, this is a speed measurement device for a railway vehicle that calculates the speed of the railway vehicle. Thereby, it becomes possible to obtain the speed change of the railway vehicle based on the plurality of calculated speeds. Alternatively, it is possible to obtain a highly accurate speed based on a plurality of calculated speeds.

A fifteenth aspect is the speed measurement device for a railway vehicle according to the fourteenth aspect, wherein the speed calculation section calculates the speed of the railway vehicle calculated for a plurality of combinations of the three or more RFID tags. This is a speed measuring device for railway vehicles that calculates the average speed of the train. As a result, the position at which the RFID reader detects the RFID tag may vary. By setting the average speed to the speed of the railway vehicle, variations in the detection position of the RFID tag with respect to the RFID reader are canceled out, and the speed of the railway vehicle can be determined with high accuracy.

A 16th aspect is the speed measuring device for a railway vehicle according to the 14th or 15th aspect, in which the RFID readers are arranged so as to be distributed at three or more different positions along the longitudinal direction of the railway vehicle. The present invention is a speed measuring device for a railway vehicle that reads the tag information of the three or more RFID tags provided on the railway vehicle. A plurality of speeds of the railway vehicle are determined at different positions in the longitudinal direction of the railway vehicle. In particular, when the average speed of the railway vehicle is calculated, variations in the detection position of the RFID tag relative to the RFID reader in the longitudinal direction of the railway vehicle are canceled out.

A seventeenth aspect is the speed measurement device for a railway vehicle according to any one of the fourteenth to sixteenth aspects, wherein the speed calculation unit performs calculations on a plurality of combinations of the three or more RFID tags. Based on the determined speed of the railway vehicle, speed change information of the railway vehicle is output. Thereby, changes in the speed of the railway vehicle can be measured.

A method for measuring the speed of a railway vehicle according to an eighteenth aspect includes (a) reading tag information from a plurality of RFID tags provided on a railway vehicle, and (b) the tag information of each of the plurality of RFID tags. and a step of calculating the speed of the railway vehicle based on the difference in time when the RFID tags are read and the distance between the plurality of RFID tags on the railway vehicle. In this case, the speed of the railway vehicle is calculated based on the difference in time between reading the tag information of each of the plurality of RFID tags provided on the railway vehicle and the distance between the plurality of RFID tags on the railway vehicle. Therefore, the device for reading RFID tags on the orbit side can be simplified. This makes it possible to measure the speed of a railway vehicle while keeping track-side equipment costs low by using a plurality of RFID tags installed on the railway vehicle.

A nineteenth aspect is the method for measuring the speed of a railway vehicle according to the eighteenth aspect, in which, in the step (b), for a plurality of combinations of three or more RFID tags provided on the railway vehicle. , calculate the speed of the railway vehicle. Thereby, it becomes possible to obtain the speed change of the railway vehicle based on the plurality of calculated speeds. Alternatively, it is possible to obtain a highly accurate speed based on a plurality of calculated speeds.

A 20th aspect is the method for measuring the speed of a railway vehicle according to the 19th aspect, wherein in the step (b), the speed of the railway vehicle determined for the plurality of combinations of the three or more RFID tags is Calculate the average speed. The position at which the RFID tag is detected may vary. By setting the average speed to the speed of the railway vehicle, variations in the detection positions of the RFID tags are canceled out, and the speed of the railway vehicle can be determined with high accuracy.

18 Track 20 Railway vehicle 30 Speed measurement system 32 Speed measurement device 34, 134 RFID tag 40, 140a, 140b, 140c RFID reader 50 Speed calculation device 52 Processing device 53 Storage section 53a Speed calculation program 53b Tag position table 53c Reading list 53d Speed history 53e Reference speed 60, 160a, 160b, 160c Alarm unit 110 Branch track 112 Terminal stop position

Claims (14)

A plurality of RFID tags provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle;
an RFID reader provided on a track side on which the railway vehicle runs and reads tag information from the plurality of RFID tags;
Speed calculation for calculating the speed of the railway vehicle based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags and the distance between the plurality of RFID tags on the railway vehicle. Department and
Equipped with
The plurality of RFID tags include three or more of the RFID tags,
The speed calculating unit calculates the speed of the railway vehicle for the plurality of combinations of the three or more RFID tags, and further calculates the speed of the railway vehicle for the plurality of combinations of the three or more RFID tags. A railway vehicle speed measurement system that calculates the average speed of a railway vehicle. The railway vehicle speed measurement system according to claim 1,
A speed measuring system for a railway vehicle, wherein the speed calculation unit calculates a distance between the plurality of RFID tags in the railway vehicle based on position information of the plurality of RFID tags in the railway vehicle. The railway vehicle speed measurement system according to claim 2,
further comprising a storage unit storing a tag position table that associates IDs of the plurality of RFID tags with positional information of the plurality of RFID tags in the railway vehicle,
A speed measurement system for a railway vehicle, wherein the speed calculation unit calculates a distance between the plurality of RFID tags in the railway vehicle based on the tag position table. A speed measurement system for a railway vehicle according to any one of claims 1 to 3 ,
A speed measuring system for a railway vehicle, wherein the three or more RFID tags are provided in the railway vehicle so as to be distributed at three or more different positions along the longitudinal direction of the railway vehicle. A speed measurement system for a railway vehicle according to any one of claims 1 to 4 ,
A speed measurement system for a railway vehicle, wherein the three or more RFID tags are provided at different positions in the width direction of the railway vehicle. A plurality of RFID tags provided on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle;
an RFID reader provided on a track side on which the railway vehicle runs and reads tag information from the plurality of RFID tags;
Speed calculation for calculating the speed of the railway vehicle based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags and the distance between the plurality of RFID tags on the railway vehicle. Department and
Equipped with
The plurality of RFID tags include three or more of the RFID tags,
The speed calculation unit calculates the speed of the railway vehicle for a plurality of combinations of the three or more RFID tags,
A speed measurement system for a railway vehicle, wherein the speed calculation unit outputs speed change information of the railway vehicle based on speeds of the railway vehicle calculated for a plurality of combinations of the three or more RFID tags. The railway vehicle speed measurement system according to any one of claims 4 to 6 ,
A speed measurement system for a railway vehicle, further comprising: a warning unit that issues a warning when the speed of the railway vehicle calculated by the speed calculation unit matches a warning condition. A speed measurement system for a railway vehicle according to any one of claims 1 to 7 ,
the trajectory includes a branch trajectory;
The RFID reader is a speed measuring system for a railway vehicle, wherein the RFID reader is provided at a position to read an RFID tag provided on the railway vehicle passing through the branch track. A speed measurement system for a railway vehicle according to any one of claims 1 to 8 ,
The RFID reader is a speed measuring system for a railway vehicle, which is provided at a position to read an RFID tag provided on a railway vehicle traveling toward a terminal stop position on the track. an RFID reader that is installed on a track side on which a railway vehicle runs and reads tag information from a plurality of RFID tags that are installed on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle; ,
Speed calculation for calculating the speed of the railway vehicle based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags and the distance between the plurality of RFID tags on the railway vehicle. Department and
Equipped with
The plurality of RFID tags include three or more of the RFID tags,
The speed calculation unit calculates the speed of the railway vehicle for a plurality of combinations of the three or more RFID tags provided on the railway vehicle, and further calculates the speed of the railway vehicle for a plurality of combinations of the three or more RFID tags provided on the railway vehicle. A speed measuring device for a railway vehicle that calculates an average speed of the speeds of the railway vehicle determined for the speed of the railway vehicle. The railway vehicle speed measuring device according to claim 10 ,
The speed calculation unit is a speed measurement device for a railway vehicle that calculates a distance between the plurality of RFID tags in the railway vehicle based on position information of the plurality of RFID tags in the railway vehicle. The railway vehicle speed measuring device according to claim 10 or 11 ,
The RFID reader reads the tag information of the three or more RFID tags provided on the railway vehicle so as to be distributed at three or more different positions along the longitudinal direction of the railway vehicle, and the RFID reader reads the tag information of the three or more RFID tags provided on the railway vehicle so as to be distributed at three or more different positions along the longitudinal direction of the railway vehicle. measuring device. an RFID reader that is installed on a track side on which a railway vehicle runs and reads tag information from a plurality of RFID tags that are installed on the railway vehicle so as to be distributed at two or more different positions along the longitudinal direction of the railway vehicle; ,
Speed calculation for calculating the speed of the railway vehicle based on the difference in time when the RFID reader reads the tag information of each of the plurality of RFID tags and the distance between the plurality of RFID tags on the railway vehicle. Department and
Equipped with
The speed calculation unit calculates the speed of the railway vehicle for a plurality of combinations of three or more RFID tags provided on the railway vehicle,
The speed calculation unit is a speed measurement device for a railway vehicle, wherein the speed calculation unit outputs speed change information of the railway vehicle based on speeds of the railway vehicle calculated for a plurality of combinations of the three or more RFID tags. (a) reading tag information from a plurality of RFID tags installed on a railway vehicle;
(b) calculating the speed of the railway vehicle based on the difference in time when the tag information of each of the plurality of RFID tags is read and the distance between the plurality of RFID tags in the railway vehicle;
Equipped with
The plurality of RFID tags include three or more of the RFID tags,
In the step (b), the speed of the railway vehicle is calculated for a plurality of combinations of the three or more RFID tags provided on the railway vehicle, and A method for measuring the speed of a railway vehicle, which calculates an average speed of the speeds of the railway vehicles determined for each combination .

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