JP7045791B2 - Wheel diameter identification device - Google Patents

Description

The present invention relates to a technique for specifying a wheel diameter of a train.

Patent Document 1 describes a mechanism for specifying a train wheel diameter (wheel diameter) by detecting an electromagnetic coupling between an on-vehicle antenna connected to an on-vehicle device and a ground element. Specifically, the on-board device detects the electromagnetic coupling between each of the two ground elements located at known distances along the rail and the on-board antenna, allowing the train to detect those two ground elements. It is determined that the vehicle has traveled the distance between them. The train is equipped with a speed generator that outputs a predetermined number of pulse signals to the on-board device for each rotation of the wheel. The on-board device counts the number of pulse signals output by the speed generator while the train travels between the two ground elements. The on-board device divides the number of pulse signals counted while the train travels between two ground elements by the number of pulse signals output from the speed generator for each wheel revolution, and the train Calculate the number of wheel rotations while traveling between two ground elements. The on-board device calculates the wheel diameter by dividing the distance between the two ground elements by the calculated wheel rotation speed and pi.

Japanese Unexamined Patent Publication No. 2013-104679

In the mechanism described in Patent Document 1, the on-board device determines that the train has reached a predetermined position by detecting the electromagnetic coupling between the on-board antenna and the ground element. The electromagnetic coupling between the on-board antenna and the ground element occurs at any position within the response range having a certain length in the direction of travel of the train. Therefore, the distance between the mileage from the detection of the first ground element to the detection of the second ground element by the on-board device and the distance between the two ground elements is the same as the length of the response range at the maximum. There will be some deviation. Due to this deviation, the wheel diameter may not be specified with high accuracy depending on the mechanism described in Patent Document 1.

Further, the mechanism described in Patent Document 1 uses a ground element. Installation and maintenance of ground elements is generally expensive.

Further, in the mechanism described in Patent Document 1, the on-board device cannot calculate the wheel diameter unless it passes through two ground elements. As mentioned above, it is not practical to install a large number of ground elements at short intervals because the installation and maintenance of ground elements is generally expensive. That is, the distance between adjacent ground elements is a long distance to some extent. Therefore, in the case of the mechanism described in Patent Document 1, the wheel diameter cannot be calculated unless the train travels in a predetermined section over a long distance, and the wheel diameter cannot be calculated at an arbitrary timing and at an arbitrary place.

In addition, the longer the mileage of a train, the higher the probability that wheels will slip or slip during running. When the wheel slips, the number of revolutions of the wheel during that period becomes higher than the number of revolutions according to the actual mileage. Further, when the wheel slides, the number of rotations of the wheel during that period becomes less than the number of rotations according to the actual mileage. Therefore, when the wheel slips or slides, an error occurs in the calculated wheel diameter. In the mechanism described in Patent Document 1, as described above, the train needs to travel a predetermined section over a long distance in order to calculate the wheel diameter, which is caused by the wheel slipping or sliding from the calculated wheel diameter. The error cannot be removed.

In view of the above circumstances, it is an object of the present invention to provide a means for specifying the wheel diameter of a train with high accuracy.

In order to solve the above-mentioned problems, the present invention transmits electromagnetic waves to the treads of the wheels of the train mounted on the train, and measures the speed from the transition amount of the received electromagnetic waves to the frequency of the transmitted electromagnetic waves. A wheel diameter specifying device that specifies the wheel diameter of the wheel by using the traveling speed of the train measured by the Doppler type speedometer and the rotation speed of the wheel measured by the tachometer mounted on the train. It is provided as a first aspect.

According to the wheel diameter specifying device of the first aspect, the wheel diameter is specified based on the moving speed of the tread surface of the wheel, and the wheel diameter is determined with higher accuracy than the configuration in which the wheel diameter is specified by the detection of the ground element. Be identified.

In the wheel diameter specifying device of the first aspect described above, the mileage of the train is specified by adding up the values obtained by multiplying each of the traveling speeds of the train measured by the speedometer at predetermined time intervals by the predetermined time. However, a configuration in which the wheel diameter is specified using the mileage may be adopted as the second aspect.

According to the wheel diameter specifying device of the second aspect, the mileage is specified with high accuracy as compared with the case where the mileage of the train is specified based on the detection of the two ground elements.

In the wheel diameter specifying device of the first or second aspect described above, the third configuration is that the wheel diameter is specified by using the rotation speed measured by the tachometer while the train travels a predetermined distance. It may be adopted as an aspect of.

According to the wheel diameter specifying device of the third aspect, the wheel diameter is specified every time the train travels a predetermined distance.

In the wheel diameter specifying device of the third aspect, the wheel diameter is repeatedly specified every time the train travels the predetermined distance, and the specified wheel diameter is statistically processed to specify the true wheel diameter of the wheel. May be adopted as the third aspect.

According to the wheel diameter specifying device of the fourth aspect, the error included in the plurality of wheel diameters specified for each running of a predetermined distance of the train is reduced.

In the wheel diameter specifying device of the first or second aspect described above, the fifth configuration is that the wheel diameter is specified using the traveling speed measured by the speedometer while the wheel rotates a predetermined number of times. It may be adopted as an aspect of.

According to the wheel diameter specifying device of the fifth aspect, the wheel diameter is specified every time the wheel rotates a predetermined number of times.

In the wheel diameter specifying device of the fifth aspect described above, the wheel diameter is repeatedly specified every time the wheel rotates a predetermined number of times, and the specified wheel diameter is statistically processed to specify the true wheel diameter of the wheel. May be adopted as the sixth aspect.

According to the wheel diameter specifying device of the sixth aspect, the error included in the plurality of wheel diameters specified each time the wheel rotates a predetermined number of times is reduced.

The figure which shows the structure of the train which concerns on one Embodiment. The block diagram which shows the hardware composition of the wheel diameter specifying apparatus which concerns on one Embodiment. The block diagram which shows the functional structure of the information processing apparatus which concerns on one Embodiment. A flow chart of a wheel diameter specifying process according to an embodiment. A flow chart of a wheel diameter specifying process according to a modification.

An embodiment of the present invention will be described. FIG. 1 is a diagram showing a hardware configuration of a train 5 traveling on a track 6 and a wheel diameter specifying device 1 arranged on the train 5. The wheel diameter specifying device 1 is a device for specifying the wheel diameter (wheel diameter) of the wheel 51 of the train 5. The train 5 includes a plurality of wheels, but in the following description, the operation and the like will be described by taking as an example the case where the wheel diameter specifying device 1 specifies the wheel diameter of the wheel 51 shown on the right side of FIG.

The wheel diameter specifying device 1 includes an information processing device 11, a speedometer 12, and a speed generator 13. The wheel diameter specifying device 1 is an information processing device 11 based on the traveling speed of the train 5 measured by the speed meter 12 and the number of pulse signals output from the speed generator 13 each time the wheel 51 rotates by a predetermined angle. The wheel diameter of the wheel 51 is specified by using the rotation speed of the specified wheel 51.

The speedometer 12 is a Doppler type speedometer that transmits electromagnetic waves to the road surface. Specifically, the speedometer 12 is a millimeter wave speedometer, which transmits a millimeter wave (an example of an electromagnetic wave) to an orbit 6 (an example of a road surface) and receives a millimeter wave reflected by the orbit 6. The frequency of the received millimeter wave is accompanied by a frequency transition due to the Doppler effect with respect to the frequency of the transmitted millimeter wave, and from the amount of transition from the frequency of the transmitted millimeter wave to the frequency of the received millimeter wave (Doppler frequency). The traveling speed of the train 5 is required. The speedometer 12 measures the traveling speed every time the predetermined time T elapses, and outputs speed data indicating the measured traveling speed to the information processing apparatus 11. The predetermined time T is, for example, about 10 milliseconds, but an appropriate predetermined time T is set according to the accuracy required for specifying the wheel diameter of the wheel 51. In the present embodiment, the timing at which the speedometer 12 measures the traveling speed and outputs the speed data and the timing at which the speed generator 13 outputs the pulse signal are not synchronized.

The speed generator 13 outputs a pulse signal of a predetermined number P while the wheel 51 makes one rotation. Specifically, the speed generator 13 is wound around a spur gear having a number of teeth P coaxially with the axle 52, a magnetic pole provided at a position facing the spur gear in a direction perpendicular to the axle 52, and a magnetic pole. Equipped with a broken coil. When the spur gear rotates together with the wheel 51, the magnetic poles alternately face the tooth tips and the tooth bottoms of the spur gear, so that the magnetic flux generated in the magnetic poles changes. The speed generator 13 outputs a pulse signal indicating a change in voltage generated in the coil in response to a change in magnetic flux to the information processing apparatus 11. As a result, the speed generator 13 outputs a pulse signal P times while the wheel 51 makes one rotation. The information processing apparatus 11 counts the number of pulse signals output from the speed generator 13, and divides the count value of the pulse signals by P to calculate the number of rotations of the wheels 51. As described above, in the present embodiment, a tachometer for measuring the rotation speed of the wheel 51 is realized by the cooperation between the speed generator 13 and the information processing device 11.

FIG. 2 is a block diagram showing a hardware configuration of the information processing apparatus 11. The information processing device 11 includes a calculation unit 111, a storage unit 112, an input / output IF (Interface) unit 113, and a UI (User Interface) unit 114. The storage unit 112 includes a storage device such as a hard disk drive, and stores programs and data. The arithmetic unit 111 includes a processor and a memory used as a work area in data processing, and executes various data processing according to a program stored in the storage unit 112.

A speedometer 12 and a speed generator 13 are connected to the input / output IF unit 113. The calculation unit 111 receives the pulse signal output from the speed generator 13 via the input / output IF unit 113, and counts the number of the received pulse signals. Further, the calculation unit 111 receives the speed data output from the speedometer 12 via the input / output IF unit 113 and uses it for calculating the mileage of the train 5.

The UI unit 114 includes, for example, a touch display in which a touch panel is laminated on the display surface of the display, displays various information on the display, and accepts operations by the user by the touch panel. The UI unit 114 may be configured as a device separated from the main body of the information processing device 11, and the UI unit 114 may be connected to the input / output IF unit 113.

FIG. 3 is a diagram showing a functional configuration of the information processing apparatus 11. In the present embodiment, the functional configuration shown in FIG. 3 is realized by the arithmetic unit 111 executing data processing according to the program stored in the storage unit 112.

The information processing apparatus 11 calculates the mileage of the train 5 using the speed data acquisition unit 101 that acquires the speed data output from the speedometer 12 and the traveling speed indicated by the speed data acquired by the speed data acquisition unit 101. The mileage integrating unit 102 is provided. Specifically, the speed data acquisition unit 101 acquires speed data every time the predetermined time T elapses. The mileage integration unit 102 calculates the mileage of the train 5 in the latest past predetermined time T by multiplying the running speed indicated by the speed data by the predetermined time T. The mileage integrating unit 102 integrates the mileage of the train 5 for each period of the predetermined time T calculated after the start of a series of processes for specifying the wheel diameter (hereinafter referred to as "wheel diameter specifying process"). The mileage of the train 5 from the start of the wheel diameter specifying process to the present is calculated.

Further, the information processing apparatus 11 includes a pulse signal acquisition unit 103 that acquires a pulse signal output from the speed generator 13 and a pulse signal counting unit 104 that counts the number of pulse signals acquired by the pulse signal acquisition unit 103. Be prepared. Specifically, the pulse signal acquisition unit 103 acquires a pulse signal each time the wheel 51 rotates by a predetermined angle (2π / P). The pulse signal counting unit 104 counts the number of pulse signals acquired by the pulse signal acquisition unit 103 after the start of the wheel diameter specifying process.

Further, the information processing apparatus 11 calculates the wheel diameter of the wheel 51 based on the mileage of the train 5 calculated by the mileage integrating unit 102 and the counted value of the pulse signal counted by the pulse signal counting unit 104. It includes a calculation unit 105 and a wheel diameter data output unit 106 that outputs wheel diameter data indicating the wheel diameter calculated by the wheel diameter calculation unit 105 to an external device.

In the present embodiment, the wheel diameter calculating unit 105 uses the mileage integrating unit 102 for a period from the start of the wheel diameter specifying process to the time when the counted value of the pulse signal counted by the pulse signal counting unit 104 reaches a predetermined value. The calculated integrated value of the mileage of the train 5 is divided by the number of rotations of the wheels 51 and the circumference ratio to calculate the wheel diameter of the wheels 51.

The output destination of the wheel diameter data of the wheel diameter data output unit 106 is, for example, a control device for controlling the running of the train 5. The control device may, for example, control a brake or the like in order to accurately stop the train 5 at a predetermined position in the station. At that time, the control device needs to accurately grasp the mileage of the train 5 from the reference position in the station. In such a case, the control device determines the mileage of the train 5 from the reference position based on the wheel diameter indicated by the wheel diameter data output from the information processing device 11 and the pulse signal output from the speed generator 13. Calculate and use. The output destination of the wheel diameter data is not limited to the control device that controls the running of the train 5. For example, when the on-board device includes a communication unit that performs data communication with the host system, the wheel diameter data output from the information processing device 11 may be transmitted to the host system via the on-board device.

Subsequently, a specific example of the wheel diameter specifying process executed by the wheel diameter specifying device 1 will be described. FIG. 4 is a flow chart of the wheel diameter specifying process. The wheel diameter specifying device 1 starts the wheel diameter specifying process according to an instruction given by the user via the UI unit 114, for example. It is desirable that the wheel diameter specifying process be executed in a situation where the wheels are unlikely to slip or slide. The situation in which the wheels are less likely to slip or slide is, for example, a situation in which the vehicle is traveling at a substantially constant speed in a section where the gradient of the track 6 is negligibly small. The flow of the wheel diameter specifying process shown in FIG. 4 will be described below.

With the start of the wheel diameter specifying process, the pulse signal counting unit 104 sets 0 to the pulse signal count value C (step A01).

The pulse signal counting unit 104 monitors the acquisition of the pulse signal from the speed generator 13 by the pulse signal acquisition unit 103 (step A02). When the pulse signal acquisition unit 103 acquires the pulse signal (step A02: YES), the pulse signal counting unit 104 adds 1 to the count value C of the pulse signal (step A03). When the count value C is updated by the process of step A03, the wheel diameter calculation unit 105 determines whether or not the updated count value C has reached a predetermined value (P × N) (step A04). The predetermined value (P × N) is the number of pulse signals output by the speed generator 13 while the wheel 51 rotates N times. Therefore, the determination in step A04 means the determination as to whether or not the wheel 51 has rotated N.

In step A04, when the count value C of the pulse signal has not reached a predetermined value (P × N) (step A04: NO), the information processing apparatus 11 repeats the processes after step A02. On the other hand, when the count value C of the pulse signal reaches a predetermined value (P × N) (step A04: YES), the wheel diameter calculation unit 105 calculates the wheel diameter (step C01).

In order to calculate the wheel diameter executed by the wheel diameter calculation unit 105 in step C01, the mileage of the train 5 while the wheel 51 rotates N is required. Therefore, the information processing apparatus 11 performs the processes of steps B01 to B05 described below in parallel with the processes of steps A01 to A04.

First, with the start of the wheel diameter specifying process, the mileage integrating unit 102 sets 0 to the integrated value L of the mileage (step B01).

The mileage integration unit 102 monitors the acquisition of speed data from the speedometer 12 by the speed data acquisition unit 101 (step B02). When the speed data acquisition unit 101 acquires the speed data (step B02: YES), the mileage integration unit 102 multiplies the traveling speed indicated by the acquired speed data by the predetermined time T, and the period of the most recent past predetermined time T. The mileage of the train 5 in the above is calculated (step B03). Subsequently, the mileage integrating unit 10 adds the mileage calculated in step B03 to the integrated value L of the mileage (step B04).

The integrated value L of the mileage calculated by the mileage integrating unit 102 is expressed by the following equation 1.
L = V1 × T + V2 × T + ・ ・ ・ + VM × T ・ ・ ・ Equation 1
(However, V1, V2, ..., VM are the traveling speeds indicated by each of the speed data)

Subsequently, the mileage integrating unit 102 determines whether or not the count value C at that time has reached a predetermined value (P × N) (step B05).

In step B05, when the count value C of the pulse signal has not reached a predetermined value (P × N) (step B05: NO), the information processing apparatus 11 repeats the processes after step B02. On the other hand, when the count value C of the pulse signal reaches a predetermined value (P × N) (step B05: YES), the wheel diameter calculation unit 105 calculates the wheel diameter (step C01).

In step C01, the wheel diameter calculation unit 105 calculates the wheel diameter D of the wheel 51 according to the following equation 2.
D = (L / N) / π ・ ・ ・ Equation 2

Subsequently, the wheel diameter data output unit 106 outputs wheel diameter data indicating the wheel diameter D calculated by the wheel diameter calculation unit 105 (step C02). As described above, the output destination of the wheel diameter data is, for example, a control device that controls the running of the train 5. However, the output destination of the wheel diameter data is not limited to this. Further, the output destination of the wheel diameter data is not limited to the external device, and may be output and stored in the storage unit 112 included in the information processing device 11, or may be output to the UI unit 114 included in the information processing device 11. It may be used to display the wheel diameter to the user.

The wheel diameter specifying device 1 according to the present embodiment specifies the mileage of the train 5 from the running speed of the train 5 measured by the speedometer 12 mounted on the train 5. More specifically, the wheel diameter specifying device 1 adds up the values obtained by multiplying each of the running speeds of the train measured at predetermined time intervals by a Doppler type speedometer that transmits electromagnetic waves to the road surface by the predetermined time. To identify the mileage of the train. Therefore, the mileage of the train 5 specified by the wheel diameter specifying device 1 is not accompanied by an error depending on the length of the response range as in the case of specifying the mileage of the train by using the detection of the ground element. As a result, the wheel diameter specified by the wheel diameter specifying device 1 is more accurate than the wheel diameter specified by using the detection of the ground element.

Further, the wheel diameter specifying device 1 according to the present embodiment specifies the wheel diameter by using the traveling speed measured by the speedometer 12 while the wheel 51 rotates a predetermined number of times. Therefore, according to the wheel diameter specifying device 1, it is possible to specify the wheel diameter in a shorter mileage as compared with the configuration in which the wheel diameter is specified by using the detection of the ground element. The shorter the mileage, the lower the probability that the wheel will slip or slide while traveling. Therefore, according to the wheel diameter specifying device 1, the wheel diameter is specified by using the detection of the ground element. The wheel diameter with less error due to slipping or sliding is specified.

Further, the wheel diameter specifying device 1 according to the present embodiment is arranged on the train 5, and it is not necessary to use outdoor equipment. Therefore, the cost required to install and maintain the equipment is generally lower than when the outdoor equipment is used, such as when the wheel diameter is specified by using the detection of the ground element.

[Modification example]
The embodiments described above may be variously modified within the scope of the technical idea of the present invention. An example of these variations is shown below. In addition, these modified examples may be combined appropriately.

(1) In the above-described embodiment, the wheel diameter specifying device 1 specifies the wheel diameter using the traveling speed measured by the speedometer 12 while the wheel 51 rotates a predetermined number of times. Instead of this, a configuration may be adopted in which the wheel diameter specifying device 1 specifies the wheel diameter using the rotation speed measured by the tachometer while the train 5 travels a predetermined distance. Specifically, it is as follows.

FIG. 5 is a flow chart of the wheel diameter specifying process in this modification. In FIG. 5, the steps common to the steps shown in FIG. 4 are designated by the same reference numerals as those used in FIG.

In the above-described embodiment, in step A04 following step A03, the pulse signal counting unit 104 determines whether or not the counting value C of the pulse signal has reached a predetermined value (P × N). Instead of this, in the present modification, in step D01 following step A03, the pulse signal counting unit 104 determines whether or not the integrated value L of the mileage has reached the predetermined value E.

Further, in the above-described embodiment, in step B05 following step B04, the mileage integrating unit 102 determines whether or not the count value C of the pulse signal has reached a predetermined value (P × N). Instead of this, in the present modification, in step D02 following step B04, the mileage integrating unit 102 determines whether or not the integrated value L of the mileage has reached the predetermined value E.

Further, in the above-described embodiment, in step C01, the wheel diameter calculation unit 105 calculates the wheel diameter D according to the above-mentioned equation 2. Instead of this, in this modification, the wheel diameter calculation unit 105 calculates the wheel diameter D according to the following equation 3.
D = (E / (C / P)) / π ・ ・ ・ Equation 3

(2) The timing at which the wheel diameter specifying device 1 performs the wheel diameter specifying process may be any timing. However, if the traveling speed of the train 5 is slow, the Doppler frequency becomes small, so that the accuracy of the traveling speed measured by the speedometer 12 may decrease. Therefore, for example, the wheel diameter specifying device 1 may execute the wheel diameter specifying process with the traveling speed measured by the speedometer 12 exceeding a predetermined threshold value as a trigger.

Further, in general, when the train accelerates, the wheels tend to slip, and when the train decelerates, the wheels tend to slip. Therefore, for example, the wheel diameter specifying device 1 may execute the wheel diameter specifying process by triggering that the time-dependent change (or the time-dependent change rate) of the traveling speed measured by the speedometer 12 falls below a predetermined threshold value. ..

(3) A configuration may be adopted in which the wheel diameter specifying device 1 repeatedly specifies the wheel diameter, statistically processes the specified plurality of wheel diameters, and specifies the true wheel diameter of the wheel 51. For example, the information processing apparatus 11 repeatedly executes the wheel diameter specifying process according to the flow chart of FIG. 4 (or FIG. 5), and stores the wheel diameter data indicating the specified wheel diameter. The information processing apparatus 11 may perform the wheel diameter specifying process a plurality of times at any interval. For example, the information processing apparatus 11 may continuously execute the wheel diameter specifying process a plurality of times, or may repeatedly execute the wheel diameter specifying process every time a predetermined time elapses. The information processing device 11 includes a statistical processing unit that performs predetermined statistical processing using the wheel diameters indicated by a plurality of stored wheel diameter data. The statistical processing performed by the statistical processing unit may be any statistical processing that eliminates or reduces the error included in the calculated wheel diameter. Examples of such statistical processing include exclusion of outliers, calculation of mean, calculation of median, calculation of mode, and the like. According to this modification, a wheel diameter having a smaller error is specified as compared with a configuration in which statistical processing is not performed.

(4) In the above-described embodiment, the wheel diameter specifying device 1 includes a Doppler type speedometer 12 that transmits electromagnetic waves to the road surface. Instead of this, a configuration may be adopted in which the wheel diameter specifying device 1 includes a Doppler type speedometer 12 that transmits an electromagnetic wave to the tread surface of the wheel. Specifically, in this modification, the speedometer 12 transmits an electromagnetic wave to the tread of the wheel 51 and receives the electromagnetic wave reflected by the tread of the wheel 51. The speedometer 12 specifies the traveling speed of the train 5 from the Doppler frequency of the transmitted and received electromagnetic waves. According to this modification, the wheel diameter is specified based on the traveling speed of the train specified by the moving speed of the tread of the wheel. Therefore, the influence of wheel idling or gliding on the specified wheel diameter is reduced as compared to the case where the ground speed of the train is used as the traveling speed.

(5) In the above-described embodiment, the speedometer 12 included in the wheel diameter specifying device 1 is a millimeter-wave speedometer. The type of the speedometer 12 included in the wheel diameter specifying device 1 is not limited to this. For example, the speedometer 12 may be a laser surface speedometer. The laser surface velocityometer irradiates, for example, two laser beams (an example of an electromagnetic wave) so that their tips intersect on the surface of an object. The sensor receives scattered light modulated by the interference fringes of the two laser beams and outputs a signal indicating the frequency transitioned by the Doppler effect. The laser surface speedometer calculates the moving speed of the surface of the object using the transition frequency and the interval of the interference fringes.

Further, the wheel diameter specifying device 1 may include a speedometer 12 of a method other than the Doppler method. For example, the wheel diameter specifying device 1 may include a speedometer 12 such as a Pitot tube and a quantum compass. Further, the wheel diameter specifying device 1 may include a speedometer 12 that measures the traveling distance of the train based on the moving distance of the feature points in the image obtained by photographing the road surface or the tread surface of the wheel 51 at regular time intervals.

(6) In the above-described embodiment, an example is shown in which the function of the tachometer is realized by the cooperation between the information processing device 11 and the speed generator 13, but even if the function of the tachometer is realized by another configuration. good. For example, the wheel diameter specifying device 1 may include a tachometer that measures the rotation speed using a rotary encoder, and the rotation speed of the wheel 51 measured by the tachometer may be used to specify the wheel diameter.

(7) In the above-described embodiment, synchronization is not established between the timing of measuring the traveling speed of the train 5 by the speedometer 12 and the timing of the output of the pulse signal by the speed generator 13. Instead of this, the timing of measuring the traveling speed of the train 5 by the speedometer 12 and the timing of the output of the pulse signal by the speed generator 13 may be synchronized. For example, each time the information processing apparatus 11 receives a pulse signal (P × N) times corresponding to the N rotation of the wheel 51 from the speed generator 13, the speedometer 12 is instructed to measure the traveling speed, and the instruction is given. Speed data indicating the traveling speed measured accordingly is received from the speedometer 12. Each time the information processing apparatus 11 receives speed data from the speedometer 12, the traveling speed indicated by the speed data is multiplied by the time required to receive the pulse signal (P × N) times, and the wheel 51 is N. The mileage of the train 5 during the rotation is calculated. In this case, it is assumed that the change in the traveling speed of the train during N rotations of the wheels is negligibly small. The information processing device 11 calculates the wheel diameter by dividing the calculated mileage by the rotation speed N of the wheel 51 and the pi.

(8) The radius of the wheel is 1/2 of the diameter of the wheel, and specifying the diameter of the wheel is technically synonymous with specifying the radius of the wheel. Therefore, in the present application, in specifying the wheel diameter, the radius of the wheel may be specified instead of the diameter of the wheel.

(9) In the above-described embodiment, the functional configuration of the information processing apparatus 11 shown in FIG. 3 is realized by the arithmetic unit 111 executing data processing according to the program stored in the storage unit 112. Instead of this, the information processing device 11 may be configured as a dedicated device that realizes the functional configuration shown in FIG. 3 by hardware.

1 ... Wheel diameter specifying device, 11 ... Information processing device, 101 ... Speed data acquisition unit, 102 ... Mileage integration unit, 103 ... Pulse signal acquisition unit, 104 ... Pulse signal counting unit, 105 ... Wheel diameter calculation unit, 106 ... Wheel diameter data output unit, 111 ... calculation unit, 112 ... storage unit, 113 ... input / output IF unit, 114 ... UI unit, 12 ... speed meter, 13 ... speed generator, 5 ... train, 51 ... wheel, 52 ... axle

Claims (6)

The running of the train, which is mounted on the train and transmits electromagnetic waves to the treads of the wheels of the train, and measures the speed from the transition amount of the received electromagnetic waves to the frequency of the transmitted electromagnetic waves by a Doppler type tachometer. A wheel diameter specifying device that specifies the wheel diameter of the wheel by using the speed and the rotation speed of the wheel measured by a tachometer mounted on the train. The mileage of the train is specified by adding the values obtained by multiplying each of the running speeds of the train measured by the speedometer by the predetermined time, and the wheel diameter is specified using the mileage. The wheel diameter specifying device according to claim 1. The wheel diameter specifying device according to claim 1 or 2, wherein the wheel diameter is specified by using the rotation speed measured by the tachometer while the train travels a predetermined distance. The wheel diameter specifying device according to claim 3, wherein the wheel diameter is repeatedly specified every time the train travels the predetermined distance, and the specified wheel diameter is statistically processed to specify the true wheel diameter of the wheel. The wheel diameter specifying device according to claim 1 or 2, wherein the wheel diameter is specified by using a traveling speed measured by the speedometer while the wheel rotates a predetermined number of times. The wheel diameter specifying device according to claim 5, wherein the wheel diameter is repeatedly specified every time the wheel rotates a predetermined number of times, and the specified wheel diameter is statistically processed to specify the true wheel diameter of the wheel.

Images