JP2023065774A - Measurement method of ground unit reaction distance and management method of reaction distance - Google Patents

Abstract

To provide a reaction distance measuring method to get a measured value of a ground unit reaction distance which can transmit an information signal for a detection of a home position without a payment of a lot of manpower and time.SOLUTION: An information signal about a reception of a vehicle speed information signal and a signal from a ground unit are acquired and stored for plural days by plural vehicles with prescribed time intervals, information signal about the actually 2 executed receptions among the stored information and vehicle speed information signals during receiving signals from the ground unit are extracted, reaction distance of the ground unit are calculate based on the extracted information, representative value for a specified term are determined based on the calculated reactance distance, determined representative values are stored or accumulated for 2 actual measurements, and when the 2 actual measured values coincide almost, an approximate equation of the representative value and actual value are determined based on the actual value and stored/accumulated value and the reaction distance is determined using the determined approximate equation.SELECTED DRAWING: Figure 7

Description

The present invention provides a measurement method and a reaction distance for measuring a reaction distance (a possible stopping range), which is an index related to the communication range of a beacon that is capable of transmitting an information signal for detecting a fixed position provided on a railway track. management method.

In recent years, the spread of platform doors on railway station platforms has been promoted. When platform doors are installed on a station platform, it is necessary to accurately stop the train while the platform doors are aligned with the doors on the train side. A ground coil capable of transmission is installed in orbit. On the other hand, on the railway car side, the onboard coil provided at the bottom of the car receives the fixed position signal from the ground coil, lights the fixed position stop lamp provided in the driver's seat, and the driver By operating the brake to stop the train while this lamp is lit, the train can be stopped with the platform door and the car side door aligned.

Signals from beacons capable of transmitting information signals for detecting a fixed position can be used to control the opening of platform doors by sending an open command from the vehicle side to the control device of the platform doors. It can also be used to control the opening of the side door or to automatically stop the vehicle. Patent document 1, for example, discloses an invention relating to a system for controlling the opening of platform doors based on a fixed position signal transmitted from a ground coil.
As described above, a beacon capable of transmitting information signals for detecting a fixed position plays an important role in stopping railway vehicles and controlling the opening of platform doors.

On the other hand, a beacon capable of transmitting information signals for detecting a fixed position may have a reduced communication range due to deterioration or failure of components. Therefore, as shown in FIG. 9, the range in which the on-board coil BC can receive the fixed position signal from the beacon GC is managed by a name called the reaction distance, and maintenance is performed to periodically measure the reaction distance. work is being carried out.
Note that the beacon GC capable of transmitting information signals for detecting a fixed position is arranged so that when the center position O1 of the onboard coil BC coincides with the center position O2 of the beacon GC, the center line of the door on the vehicle side and the platform It is installed in a position that matches the center line of the door. For example, if the platform door opening width is 2000 mm and the vehicle side door opening width is 1300 mm, the reaction distance is set to a range of 700 to 800 mm, which is close to the difference.

JP-A-11-348770 Japanese Patent No. 2904212

Conventionally, the measurement of the response distance of a beacon capable of transmitting an information signal for detecting a fixed position is carried out by using a receiver having the same function as a beacon that receives a fixed position signal from the beacon on the rail. A special measuring instrument equipped with a display that displays when it receives a fixed position signal, and is configured to be the same height as the onboard coil on the vehicle side when placed on the rail and movable along the rail. In use, a worker moves the measuring instrument manually, confirms the ON/OFF display, marks both ends of the communication range, and measures the marking distance with a ruler. Therefore, the conventional measurement of the response distance has the problem of requiring a lot of manpower and time.

As an invention relating to a method for measuring the mounting position of a beacon, there is an invention described in Patent Document 2, but the invention described in this prior document is for optically measuring the position of the beacon. Therefore, although the physical position can be accurately measured, there is a problem that the response distance corresponding to the communication range that varies depending on the ground coil cannot be directly measured.
The present invention has been made with a focus on the above problems, and its object is to provide a beacon capable of transmitting information signals for detecting a fixed position without requiring much manpower and time. It is an object of the present invention to provide a reaction distance measuring method and a reaction distance management method capable of obtaining a measured value of the reaction distance.

The invention according to the present application, in order to achieve the above object,
Based on the vehicle speed information signal obtained by the vehicle speed detection means mounted on the railway vehicle and the signal from the beacon obtained by the signal receiving means for receiving the signal from the beacon on the track, the beacon is detected. A method for measuring a reaction distance of a ground coil for measuring a reaction distance corresponding to a communication range,
a first step of acquiring and storing a vehicle speed information signal and an information signal related to reception of a signal from the ground coil by a plurality of vehicles at predetermined time intervals over a plurality of days by the vehicle speed detecting means and the signal receiving means;
An information signal relating to the reception of the beacon, which was actually measured twice, from among the information stored in the first step, and the vehicle speed while the signal receiving means is receiving the signal from the beacon. a second step of extracting an information signal;
a third step of calculating, based on the information extracted in the second step, the distance traveled by the vehicle while receiving the signal from the beacon as the reaction distance of the corresponding beacon;
a fourth step of determining a representative value in a predetermined period based on the reaction distance calculated in the third step;
A fifth step of accumulating or accumulating the representative values determined in the fourth step over the two actual measurement periods;
a sixth step of determining an approximation formula of the representative value and the measured value based on the measured value and the representative value accumulated or accumulated in the fifth step when the two measured values are substantially the same; ,
is included.

According to the method for measuring the reaction distance of the beacon as described above, the reaction distance of the beacon capable of transmitting the information signal for detecting the fixed position is calculated based on the data acquired by the on-board system installed in the vehicle. Therefore, the measured value of the reaction distance can be obtained without requiring many manpower and time. In addition, although there are variations in the reaction distance calculated based on the data obtained once, an approximation formula for calculating the measured value of the reaction distance is obtained by statistically processing the data obtained over multiple times from multiple vehicles. Since the determined approximation formula can be used to calculate the reaction distance, a highly accurate measurement value of the reaction distance can be obtained.

Here, desirably, in the fifth step, the beacon on the track in one direction of each route and the beacon on the track in the opposite direction are grouped, and the approximation formula is determined for each group. .
According to this method, there is a non-negligible difference in the reaction distance calculated based on the data acquired by the on-board system between the beacon on one side (up) and the beacon on the opposite side (down). Even in such a case, since the approximation formulas for the representative value and the actual measurement value are determined separately, it is possible to obtain a highly accurate response distance measurement value.

Further, the approximate expression is expressed by y=ax+b, where a and b are coefficients,
The range of variation of the representative value is set as the range of error by inserting it into the variable x of the approximation formula according to the standard deviation σ of the average value of the response distances for each month.
According to this method, a different correction formula can be set for each ground coil, thereby obtaining a highly accurate response distance measurement value.
Here, the coefficients a and b are preferably determined as different values for each beacon by statistically processing data acquired over a plurality of times from a plurality of vehicles for each beacon.

Furthermore, another invention of the present application determines a correction formula based on the approximation formula determined by the method for measuring the response distance of the beacon in the above-described procedure, and uses the correction formula to determine the response using the measured value corrected. A reactive distance management method for managing distance In a reactive distance management method for managing the reactive distance based on a measured value corrected using a correction formula determined by a ground coil reactive distance measurement method,
setting the range of variation of the representative value based on the representative value accumulated or accumulated in the fifth step, applying the approximate expression, and correcting the reaction distance calculated in the third step; a seventh step of determining a correction formula;
an eighth step of acquiring a vehicle speed information signal by vehicle speed detection means and signal reception means mounted on a railroad vehicle and an information signal relating to reception of a signal from a ground coil on a track;
a ninth step of calculating, based on the information acquired in the eighth step, the distance traveled by the vehicle while receiving the signal from the beacon as the reaction distance of each beacon;
a tenth step of correcting the response distance calculated in the ninth step with the corresponding correction formula to calculate a final measured value;
an eleventh step of determining whether or not the final measured value calculated in the tenth step is between a preset upper limit value and a lower limit value of the response distance;
is intended to include

According to the above method, the response distance is detected with high accuracy based on the data acquired by the on-board system installed in the vehicle, and the range of variation of the representative value is set to determine the correction formula, and this correction is performed. Since the final measured value is calculated after correction by the formula, even if there is variation in the average value of the response distance calculated based on the data acquired by the on-board system, the upper and lower limits of the control range are corrected appropriately. values, and the response distances of beacons installed in many stations are calculated based on the data acquired by the on-board system, and the response distances of the beacons installed in a number of stations can be determined by remote management devices. can be centrally managed.

According to the reaction distance measuring method of the present invention, it is possible to obtain the measurement value of the reaction distance of the beacon capable of transmitting the information signal for detecting the fixed position without requiring much manpower and time. Further, according to the method for managing beacons of the present invention, it is possible to centrally manage the response distances of beacons that are installed in many stations and are capable of transmitting information signals for detecting fixed positions. effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram showing an example of a system applying a method for measuring a reactive distance of a beacon capable of transmitting an information signal for detecting a fixed position according to the present invention; 1 is a block diagram showing a specific example of a system (on-board system) mounted on a vehicle running on a railroad track; FIG. (A) is a graph showing the reaction distance for one month calculated in multiple trains for one beacon, and (B) is a histogram showing the distribution of the reaction distance for the above one month. is. (A) is a graph showing the relationship between the average of the calculated values for 10 months and the measured values for the ground coil in one direction of 10 stations on a certain line, (B) is the ground coil in the opposite direction of the same 10 stations. It is a graph which shows the relationship between the average of the calculation value for 10 months, and an actual measurement value. A value corrected using a linear approximation formula that shows the relationship between the monthly average change in the calculated value before correction and the actual measurement value for a beacon capable of transmitting information signals for detecting a fixed position. is a graph showing changes in average calculated values for each month. For a beacon capable of transmitting an information signal for detecting a certain fixed position, the average value corrected using a linear approximation formula showing the relationship with the actual measurement value is corrected with an error added. It is a graph which shows a change. It is a flowchart which shows an example of the processing procedure of the reaction distance measurement method of a beacon and the management method which concern on this invention. (A) is the average value of the calculated monthly response distance of the beacon on the inbound track of multiple stations, the average value for 10 months, the maximum value, the minimum value, the difference between the maximum value and the minimum value, standard Chart showing the deviation, (B) is the average value of the monthly response distance calculation values of the beacon on the outbound track of multiple stations, the average value for 10 months, the maximum value, the minimum value, the maximum value and the minimum value It is a chart which shows the difference of a value, and a standard deviation. It is a figure explaining the concept of the reaction distance determined from the positional relationship with the communication range of a beacon which can transmit the information signal for detecting a fixed position, and a beacon.

Hereinafter, a method for measuring a response distance of a ground coil according to the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram showing an example of a system for applying a method for measuring the response distance of a beacon according to the present invention, and FIG. 2 is a block diagram showing an example configuration of an on-board system mounted on a railway vehicle (train). is. Note that the configuration of the system shown in FIGS. 1 and 2 is an example, and is not limited to this.

As shown in FIG. 1, the system for implementing the method for measuring the response distance of a beacon according to the present invention includes an on-board system 10 mounted on a vehicle T for collecting various data of the vehicle during running, and a plurality of vehicles. A data collection server 21 for receiving and summarizing data collected and stored by the on-board system 10, and acquiring data necessary for calculating the reaction distance from the data collected by the data collection server 21 via a communication network 22. A computing device (computer) 23 for managing the beacon 32 capable of calculating a reaction distance and transmitting an information signal for detecting a fixed position based on the calculated reaction distance.
In addition, in the database in the data collection server 21, the response distance of a beacon (hereinafter simply referred to as a beacon) capable of transmitting an information signal for detecting the fixed position of each station using a separate dedicated measuring instrument is stored. When measurements are made, the measured values (hereinafter referred to as actual measurements) are stored.

The on-board system 10 includes an on-board coil 11 as an antenna for receiving a signal from the ground coil 32, a speed detector 12 for detecting the vehicle speed, and a signal received from the ground coil 32 and from the speed detector 12. A storage device 13 that stores the vehicle speed based on the signal of , together with time data, a wireless communication device 14 that communicates with an external data collection server 21, and the like.
When the vehicle T enters the station and the on-board coil 11 enters within the communicable range (response distance) of the ground coil 32 provided at a predetermined position on the station platform 31, a signal from the ground coil 32 is received and the car receives the signal. The upper system 10 stores in the storage device 13 an information signal representing the presence or absence of the received signal. The data stored in the storage device 13 is transmitted to the data collection server 21 by the wireless communication device 14 every day, for example, and stored in a database. Although not particularly limited, the ground coil 32 operates with power supplied via a power cable.

In addition to the onboard system 11, the speed detector 12, the storage device 13, and the wireless communication device 14, the onboard system 10 includes, as shown in FIG. A receiver 15 that amplifies and waveform-shapes the received signal, a driving device (running motor) 16 that rotates and drives the wheels, a braking device 17 for braking the vehicle, and controls the driving device 16 and the braking device 17 A control device 18 and the like are provided. Among them, the speed detector 12 is composed of, for example, a speed generator, and the control device 18 calculates the vehicle speed by calculation based on the signal from the speed generator and stores it in the storage device 13 together with the time data.

Here, the vehicle speed based on the signal from the tachometer (12) can be detected using an existing general tachometer. Some existing commercial trains are equipped with a monitoring device that samples the state of on-vehicle equipment at predetermined time intervals set for each specification and stores the data together with the time data.
Therefore, the inventor of the present invention uses a monitoring device to sample whether or not a stop position signal is received by the on-board coil 11 and the vehicle speed, and stores them together with time data. I thought that it might be possible to calculate , and conducted a study.

As a result, the one-month response distance (4359 pieces of data) calculated for each beacon, as shown in FIG. Since the deviation from the measured value (dashed line) using a dedicated measuring device is large, it became clear that it cannot be used as it is for the response distance management of the beacon.
In addition, when examining the distribution of the response distance calculated based on the speed data for one month, as shown in the histogram in FIG. Although it is almost the same as the average value, it was found that the average value deviated from the actual measurement value. It should be noted that the large fluctuations in the calculated value of the response distance based on the sampling data on the vehicle side are due to variations in the characteristics of the on-board coils on the vehicle side, installation errors of the ground coils, vehicle speed detection accuracy, and wheel A variety of factors are conceivable, including rail wear, weather-dependent wheel slippage, and differences in driver skill.

As a result of data analysis, it was found that there is a positive correlation between the measured values of the response distances of multiple ground coils and the average of the calculated values based on the collected data, as shown in FIG. In addition, FIG. 4(A) shows the average of the calculated values of the reaction distance for 10 months and the measured value of the beacon on the track in one direction of the 10 stations where the actual measurement of the reaction distance was performed twice in the past on a certain route. FIG. 4B is a graph showing the relationship between the average of the calculated values for 10 months and the measured values for the ground coils on the track in the opposite direction at the same 10 stations as described above.

In FIGS. 4A and 4B, the upward solid line is a regression line obtained using the method of least squares, and is a straight line (linear approximation) represented by a linear function. Also, the coefficient of determination ^R2 in each graph is 0.7533 and 0.8592, respectively, and it can be seen that there is a strong correlation between the average of the calculated values and the measured values. Therefore, it is expected that the above linear approximation formula can be used to correct the calculated value to a value close to the measured value.
The slope of the straight line differs depending on the direction in which the train is heading (inner/outer or up/down on the loop line). changes, it is conceivable that the reaction distance calculated based on the data acquired by the on-board system 10 will differ. Therefore, depending on the route, the same approximation formula may be used regardless of the direction in which the train is heading.

FIG. 5 shows changes in average monthly calculated values of response distance before correction and monthly average changes in calculated values corrected using the above linear approximation formula for a beacon. show. From FIG. 5, as indicated by the dashed line A before the correction, the distance outside the management range of the reaction distance (the range between the upper limit Lmax and the lower limit Lmin of the management reaction distance) is shown by the solid line B after the correction. As shown, it was found that the response distance is within the control range and appropriate correction can be performed using the linear approximation formula.

However, even with the correction as described above, the graph in FIG. ) does not change, monthly variation is a calculation error, so when the response distance actually changes, it cannot be determined whether the change is due to variation or not. Therefore, it is necessary to make corrections in consideration of variations in the calculated average values.
Therefore, as shown in FIG. 6, the inventor of the present invention corrects the calculated average value by adding an error, so that the calculated value of the reaction distance including the error falls within the range between the upper limit value Lmax and the lower limit value Lmin of the management reaction distance. I decided to go in or not. A specific method of setting the error to be added to the calculated average value will be described later.

Next, the procedures of the reactive distance measuring method and the managing method according to the present invention will be described with reference to the flow chart of FIG.
In this embodiment, first, a plurality of vehicles (for example, commercial trains) having a function of acquiring and storing received signals from beacons capable of transmitting information signals for detecting traveling speed and fixed position. Acquisition of traveling speed by the upper system 10, acquisition of the presence or absence of a received signal (reception flag), and collection of measurement data by the data collection server 21 are carried out over a period of several days to several months (step S1).

Next, by referring to the database in the data collection server 21, it is determined whether or not there is a measured value of the response distance for the ground coil installed at each station. is extracted (step S2). The method of the present invention is for correcting the measured value based on the actual measured value. Therefore, the ground coil for which actual measurement has not been performed even once is not subjected to the processing after step S3 until the first actual measurement is completed, and the processing after step S3 is performed after at least one actual measurement is performed. to do
Normally, two measured values are almost the same, but if the second measured value differs from the first measured value, it is considered that there is an abnormality in the ground coil, so adjust, repair or replace it. Work will be carried out.

In step S3, the arithmetic unit 23 calculates the reaction distance of each beacon based on the vehicle speed information signal collected by the data collection server 21 and the reception flag of the beacon. Specifically, let Ts be the timing at which the reception flag is first raised, Te be the timing at which the reception flag falls, and t seconds be the data sampling interval. Multiply the average value of t by t to find the distance traveled by the vehicle in t seconds, then multiply the average of the speed 2t seconds after Ts and the speed 2t seconds after Ts by t to find the distance traveled for the next t seconds is obtained and added to the already obtained movement distance. By repeating this calculation until Te is reached, the response distance (measurement value) of the ground coil to be measured is obtained.

In the next step S4, the average value in a predetermined period (for example, one month) of the measured values calculated as described above is obtained and determined as the representative value. is stored or accumulated (step S5). Subsequently, based on the accumulated (accumulated) representative values, an approximate expression between the representative value (average of calculated values) x and the measured value y is determined using the method of least squares (step S6). For example, in the examples of FIGS. 4A and 4B, the approximate expressions are determined as y=0.6963x+0.2623 and y=0.4765x+0.3681, respectively. By using this approximation formula, the measured value of the reaction distance can be obtained.

Next, when managing the response distance of each speaker, based on the representative values accumulated (accumulated) in step S6, the range of variation of the representative values is determined, and the magnitude of the error to be added to the representative values is determined. , for example, the standard deviation σ of the average value of the response distances for each month is used to determine the correction formula to be used (step S7).
Specifically, the difference between the average value of the calculated values of the monthly response distance of the ground coil of each station, the average value for 10 months, the maximum value, the minimum value, and the maximum value and the minimum value is shown in FIG. As shown in (A) and (B), when the value shown in the rightmost column is obtained as the standard deviation σ, the largest value among stations A to J in (A) is 0.005 and ( The largest value of 0.010 among stations A to J in B) is adopted as the value of σ. Then, the magnitude of the error to be added to the representative value is set, for example, to ±4σ, and by inserting it into the above approximation formula, the correction formula for calculating the measured values X1 and X2 is the following formula X1 = 0.6963 (x ±4σ) + 0.2623 = 0.6963(x) + 0.2623 ± 0.0139
X2 = 0.4765 (x ± 4σ) + 0.3681 = 0.4765 (x) + 0.3681 ± 0.0191
Decide like Note that the magnitude of the error is not limited to ±4σ, and may be ±3σ or the like.

After that, the process shifts to the management processing of the response distance, and first collects data (train speed and presence or absence of reception of the stop position signal) for an arbitrary number of days (including one day) by the on-board system 10 of a plurality of trains (step S8), the arithmetic unit 23 calculates the response distance of each joist based on the collected data (step S9). Then, using the correction formula determined in step S7, the calculated value of the response distance is corrected to calculate the measured value (step S10). Then, it is determined whether or not the calculated measured value is within a predetermined control range of the reaction distance (for example, 700 to 800 mm) (step S11). Also, the determination result is displayed on the display unit of the arithmetic device 23 .

According to the above-described embodiment, by performing the series of processes described above, the measured value of the reaction distance can be obtained by calculation without actually measuring the reaction distance of the ground coil using a dedicated measuring instrument. , the manpower and time required for managing the reaction distance can be greatly reduced, and the reaction distance of the beacon, which is installed in many stations and can transmit information signals for detecting the fixed position, It can be centrally managed by a management device (arithmetic device 23) at a location.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and changes are possible. For example, in the above-described embodiment, the on-board system 10 installed on trains in service collects the data necessary for measuring the reaction distance of the ground coil. The data may be collected by running the measuring vehicle.
In the above embodiment, different approximation formulas are used for up/down (one side/reverse direction), but the same approximation formula may be used depending on the target route.

10 on-board system 11 on-board child 12 speed detector (speed generator)
13 storage device 14 wireless communication device 15 receiver 16 drive device 17 braking device 18 control device 21 data collection server 22 communication network 23 computing device 31 station platform 32 ground coil

Claims (5)

Based on the vehicle speed information signal obtained by the vehicle speed detection means mounted on the railway vehicle and the signal from the beacon obtained by the signal receiving means for receiving the signal from the beacon on the track, the beacon is detected. A method for measuring a reaction distance of a ground coil for measuring a reaction distance corresponding to a communication range,
a first step of acquiring and storing a vehicle speed information signal and an information signal related to reception of a signal from the ground coil by a plurality of vehicles at predetermined time intervals over a plurality of days by the vehicle speed detecting means and the signal receiving means;
An information signal relating to the reception of the beacon, which was actually measured twice, from among the information stored in the first step, and the vehicle speed while the signal receiving means is receiving the signal from the beacon. a second step of extracting an information signal;
a third step of calculating, based on the information extracted in the second step, the distance traveled by the vehicle while receiving the signal from the beacon as the reaction distance of the corresponding beacon;
a fourth step of determining a representative value in a predetermined period based on the reaction distance calculated in the third step;
A fifth step of accumulating or accumulating the representative values determined in the fourth step over the two actual measurement periods;
a sixth step of determining an approximation formula of the representative value and the measured value based on the measured value and the representative value accumulated or accumulated in the fifth step when the two measured values are substantially the same; ,
A response distance measurement method for a ground coil, comprising: 2. The method according to claim 1, wherein in the sixth step, the ground coils on the track in one direction of each route and the ground coils on the track in the opposite direction of each route are grouped, and the approximation formula is determined for each group. A method for measuring the response distance of the ground coil described. The approximate expression is represented by y = ax + b with a and b as coefficients,
2. The range of variation of the representative value is set as a range of error by incorporating it into the variable x of the approximate expression according to the standard deviation σ of the average value of the response distance for each month. 3. The method for measuring the response distance of the ground coil according to 2. 4. The ground coil according to claim 3, wherein the coefficients a and b are determined as different values for each ground coil by statistically processing data acquired a plurality of times from a plurality of vehicles for each ground coil. Child reaction distance measurement method. A correction formula is determined based on the approximation formula determined by the reaction distance measurement method for a beacon according to any one of claims 1 to 4, and the reaction distance is managed by the measured value corrected using this correction formula. A method for managing a reaction distance,
setting the range of variation of the representative value based on the representative value accumulated or accumulated in the fifth step, applying the approximate expression, and correcting the reaction distance calculated in the third step; a seventh step of determining a correction formula;
an eighth step of acquiring a vehicle speed information signal by vehicle speed detection means and signal reception means mounted on a railroad vehicle and an information signal relating to reception of a signal from a ground coil on a track;
a ninth step of calculating, based on the information acquired in the eighth step, the distance traveled by the vehicle while receiving the signal from the beacon as the reaction distance of each beacon;
a tenth step of correcting the response distance calculated in the ninth step with the corresponding correction formula to calculate a final measured value;
an eleventh step of determining whether or not the final measured value calculated in the tenth step is between a preset upper limit value and a lower limit value of the response distance;
A method of managing a reaction distance, comprising:

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