JP2018179943A - Electromagnetic noise measurement system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a simple configuration to independently measure electromagnetic noise in each vehicle without being subject to a limitation of a measurement condition or a position in an electromagnetic noise measurement system intended for a railroad vehicle.SOLUTION: An electromagnetic noise measurement system is intended for a railroad vehicle measuring electromagnetic noise generated in the railroad vehicle, and has: an electromagnetic noise detection line that is also arranged in any of an electric wire bundle drawn-in fixed to at least one of an interior of a vehicle of a railroad vehicle formation or an exterior thereof; and an electromagnetic noise evaluation device that includes a voltage acquisition unit that acquires potential between two points. One end of the electromagnetic noise detection line is connected to a metal portion of a vehicle body via resistance, and the other end thereof is connected to the electromagnetic noise evaluation device. The voltage acquisition unit is configured to acquire potential between the other end of the noise detection line and the vehicle body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic noise measurement system, and in particular, when measuring electromagnetic noise for railway vehicles, the electromagnetic noise measurement suitable for independently measuring the generation situation of electromagnetic noise of each vehicle with a simple configuration About the system.

  The electronic devices mounted on the railway vehicle are electromagnetic noise from devices such as a drive inverter and motor mounted on the vehicle, and electromagnetic noise generated transiently by physical separation from overhead wires and rails, It is exposed to various electromagnetic noises, such as the electromagnetic noise generated by a specific operation from a close formation vehicle.

  Depending on the frequency and reception level of these electromagnetic noises, the above electronic devices may malfunction or fail. It is important to measure the electromagnetic noise by an appropriate method in order to take measures against the problems caused by the electromagnetic noise and to prevent this in advance.

  For example, Non-Patent Document 1 describes a method of dividing and measuring electromagnetic radiation generated from the entire railway system and from a single train / vehicle.

  Although not a method for measuring railway electromagnetic noise, as a related technique, for example, in the failure diagnosis method described in Patent Document 1, the printed coil 30 is formed as a one-turn coil to function as a magnetic field sensing unit A technique for diagnosing the presence or absence of a circuit board failure is disclosed by detecting the induced electromotive force induced in the printed coil 30 by the magnetic field in the vertical direction of the circuit board 10.

Japanese Patent Application Publication No. 2004-109037

Kawazaki, "Current Status and Trend of Railroad EMC International Standard", Report of Railway Research Institute, Research Institute of Railways, 2007, November, Volume 21, No. 11, p47-p50

  As described in the above Non-Patent Document 1, in order to realize railway EMC (Electromagnetic Compatibility: electromagnetic compatibility), the source and propagation path of electromagnetic noise from the railway vehicle itself and the surrounding environment are specified. There is a need to. However, due to the following reasons peculiar to railway vehicles, it is originally difficult to obtain electromagnetic noise data, and it takes a lot of time and money for measurement.

  For example, in the case of evaluating the electromagnetic noise in the railway vehicle with the terminal voltage in the device, a method of connecting a voltage probe to a test pin of the target device may be employed. The connection of the voltage probe to the device is generally limited so that it does not interfere with the failure of the device and, consequently, the business operation of the vehicle to be measured, and the characteristics such as the voltage and current of the signal to be measured are free. Could not choose to. In addition, in the case of evaluating the electromagnetic noise in the railway car by the common mode current on the wiring connected to the equipment, a method of adding a current probe to the target wiring is adopted, but As it is fixed and many areas are arranged in the concealed part covered with a cover etc., the wires and positions that can be measured are practically limited, and it is difficult to obtain the intended electromagnetic noise data. there were. Furthermore, since the ground potential is different for each vehicle and noise reduction is present, there has been a demand to independently grasp the generation situation of the electromagnetic noise of each vehicle.

  Based on the above background, when the technology described in Patent Document 1 is applied to a noise measurement device for a railway vehicle, a coil is disposed to surround the inner periphery of the vehicle body, and an induced electromotive force induced in the coil is It is possible to consider a configuration in which an induced electromotive force in a normal state measured in advance is relatively evaluated to detect an increase or decrease in electromagnetic noise. According to this configuration, it is possible to collectively acquire and evaluate the in-vehicle electromagnetic noise incident on the coil surface without being limited by the measurement conditions and the position. On the other hand, in such a configuration, since a large object such as a railway vehicle is not assumed, an excessive induced voltage is generated at the resonance frequency determined by the coil length. This induced voltage not only reduces the dynamic range of the voltage measurement unit in the failure diagnosis unit, but also can cause secondary damage due to re-radiation using the coil as a transmission antenna. Furthermore, since the electromagnetic noise source in the vehicle fluctuates from moment to moment depending on the operation situation such as power running or deceleration operation, there is a problem that it is difficult to define the above-mentioned normal state.

  Therefore, an object of the present invention is to provide an electromagnetic noise measurement system capable of measuring electromagnetic noise independently in each vehicle with a simple configuration and without limitation of measurement conditions or position.

  The configuration of the electromagnetic noise measurement system according to the present invention is preferably an electromagnetic noise measurement system for a railway vehicle that measures electromagnetic noise generated in a railway vehicle, and is drawn in at least one of the inside and outside of the railway vehicle. The electromagnetic noise detection apparatus includes an electromagnetic noise detection line disposed together with any one of the through-fixed wire bundle and a voltage acquisition unit that acquires a potential difference between two points, and one end of the electromagnetic noise detection line It connects with the metal part of the vehicle body via resistance, connects the other end to the electromagnetic noise evaluation device, and the voltage acquisition part acquires the potential difference between the other end of the noise detection line and the vehicle body.

  According to the present invention, it is possible to provide an electromagnetic noise measurement system capable of measuring electromagnetic noise independently in each vehicle with a simple configuration and without limitation of measurement conditions or position.

FIG. 1 is a diagram showing an entire configuration of a railway vehicle electromagnetic noise measurement system according to a first embodiment. It is the figure which showed simply the specification and structure in a vehicle when obtaining the measurement result of FIG. It is the graph which showed the measurement result by the electromagnetic noise evaluation apparatus 106 at the time of making resistance 108 different. FIG. 2 is a detailed block diagram of the electromagnetic noise evaluation device 106 according to the first embodiment. 5 is a flowchart showing the operation of the electromagnetic noise evaluation device 106 according to the first embodiment. It is the figure which showed simply the specification and structure in a vehicle when obtaining the measurement result of FIG. It is the graph which showed the measurement result by the electromagnetic noise evaluation apparatus 106 at the time of setting the magnetic field antenna 300 and making resistance 108 different. FIG. 8 is a diagram showing an entire configuration of a railway vehicle electromagnetic noise measurement system according to a third embodiment. It is a figure which shows the whole structure of the electromagnetic noise measurement system for rail vehicles which concerns on Embodiment 4 (the 1). It is a figure which shows the whole structure of the electromagnetic noise measurement system for rail vehicles which concerns on Embodiment 4 (the 2). FIG. 16 is a detailed block diagram of an electromagnetic noise evaluation device 106 according to a fifth embodiment. 15 is a flowchart showing the operation of the electromagnetic noise evaluation device 106 according to the fifth embodiment. FIG. 18 is a diagram showing an entire configuration of a railway vehicle electromagnetic noise measurement system according to a sixth embodiment. It is a graph which shows the change of the voltage in each vehicle. It is a figure explaining the principle which specifies the generating source of electromagnetic noise.

  Hereinafter, each embodiment according to the present invention will be described using FIG. 1 to FIG.

Embodiment 1
Hereinafter, Embodiment 1 according to the present invention will be described with reference to FIGS. 1 to 5.

First, the overall configuration of a railway vehicle electromagnetic noise measurement system according to the first embodiment will be described using FIG. 1.
In this embodiment, although the form which mounts an electromagnetic noise measurement system in the rail car of specific composition is explained, the mounting specifications of the electromagnetic noise measurement system of the present invention are not limited to this embodiment, but equipment arrangement and wiring It is applied according to the structure of the vehicle such as the position. In addition, the vehicle to be applied is applied regardless of the power system such as a vehicle or a mobile vehicle that travels by obtaining electric power from the outside such as overhead lines or third rails (power supply rails), a new transportation system, or a magnetic levitation railway. Good.

  FIG. 1 mainly shows one of the trains including the electromagnetic noise measurement system according to the present embodiment to which the electromagnetic noise measurement system is applied.

  The railway vehicle to which the electromagnetic noise measurement system of the present invention is applied is, as shown in FIG. 1, a vehicle body 100, an under floor device 101, an on-vehicle device space 102, a vehicle information management device 103, It comprises the pull-through wire bundle 105 and the electromagnetic noise evaluation device 106. The vehicle body 100 is a railway vehicle and has a metal structure. Here, the structure refers to a portion of the car body of a railway vehicle, which is constituted by an underframe, a frame, an outer plate, and the like, and bears the strength of the car body. The underfloor device 101 is a device disposed under the floor of the vehicle body 100. The on-vehicle equipment space 102 is a space for arranging on-vehicle equipment which is equipment disposed under the floor of the vehicle body 100. The vehicle information management device 103 is a device that manages vehicle operation control and on-vehicle equipment. The in-vehicle pull-in wire bundle 104 is a bundle of power supply lines and communication lines of in-vehicle devices which are mainly pulled through in the longitudinal direction of the vehicle body. Similarly, the outside wire pull-in wire bundle 105 is a bundle of power supply lines and communication lines of the device outside the vehicle. The electromagnetic noise evaluation device 106 is a device for measuring electromagnetic noise in a vehicle.

  Although the vehicle information management device 103 and the electromagnetic noise evaluation device 106 are arranged in the on-vehicle equipment space 102 in the vehicle body 100 in FIG. 1, the vehicle information management device 103 and the electromagnetic noise evaluation device 106 may be arranged in the space of the floor equipment 101. Further, although the drawing around the ceiling of the vehicle body 100 is shown in the drawing, the wire bundle 104 may be laid near the floor surface of the vehicle body 100.

  In the on-vehicle equipment space 102, an electromagnetic noise evaluation device 106 including a voltage acquisition unit for acquiring a potential difference between two points is disposed, and one electromagnetic noise detection line 107 disposed together with the in-vehicle drawn wire bundle 104. The potential difference between one end of the and the ground line 109 is acquired. The ground line 109 is connected to the vehicle body 100 near the electromagnetic noise evaluation device 106. The electromagnetic noise detection line 107 is bundled and laid by the binding section 110 at least at one place with the inside of the vehicle, and is branched near the vehicle end and connected to the metal portion of the vehicle body 100 via the resistor 108. . By connecting the electromagnetic noise detection line 107 to the conductive metal vehicle body 100, it is possible to configure a loop that detects electromagnetic noise with a minimum number of wires. Furthermore, using the unused wire included in the in-vehicle drawn through wire bundle 104 for the electromagnetic noise detection line 107 has an advantage that the number of installation steps is reduced and the maintenance is simplified. That is, unused wire is prepared for the wire bundle on the railway vehicle for the purpose of reducing maintenance cost, and such unused wire is used as the electromagnetic noise detection wire 107 of the electromagnetic noise measurement system of the present invention, The electromagnetic noise measurement system of the present invention can be easily deployed to existing vehicles.

  The resistance value of the resistor 108 can suppress resonance generated in a loop formed by the electromagnetic noise detection line 107 and the vehicle body 100, and it is desirable to select between 50 Ω and 10 kΩ not to be in an insulation state.

  The electromagnetic noise evaluation device 106 is connected to the vehicle information management device 103, acquires vehicle control information and the operating status of on-vehicle equipment, and uses the information to determine an abnormality of electromagnetic noise in the vehicle. Here, vehicle control information refers to commands related to driving such as power running and braking, and operation information of on-board devices is specific to each device including error notification information on on-board devices including service devices. Point to operational information. The reason that the electromagnetic noise evaluation device 106 refers to the vehicle control information and the operating condition of on-vehicle equipment is that the amount of electromagnetic noise and frequency generated by the inverter and motor, etc., which are the main electromagnetic noise sources of railway vehicles differ depending on the traveling condition. Therefore, it is extremely difficult to determine the abnormality of the in-vehicle electromagnetic noise without the vehicle control information or the operation information of the on-board equipment.

  Although the electromagnetic noise evaluation device 106 and the vehicle information management device 103 are disposed in the same on-vehicle device space 102 in this embodiment, the other may be in another space such as another vehicle or under the floor. . The electromagnetic noise evaluation device 106 directly acquires vehicle control information from the command line passed to the vehicle, and similarly acquires error report information included in the operating status of the on-board equipment from the error output line passed to the vehicle. Both information may be acquired from other devices such as a recorder.

Next, an example of the measurement result by the electromagnetic noise evaluation apparatus 106 will be described using FIGS. 2 and 3.
According to the configuration shown in FIG. 1, according to the configuration shown in FIG. 1, resistances 108 are installed to measure the voltage and power at Port 1 and Port 2.

  The graph of FIG. 3 shows the analysis result of the passage characteristic between the electromagnetic noise detection line 107 surrounded by the vehicle body 100 which is a metal structure and the in-vehicle drawn wire bundle 104. The horizontal axis represents frequency, and the vertical axis represents , Log ratio of power of signals passing through Port 1 and Port 2 is shown. In the short-circuit (SHORT) state (for example, the resistance 108 is 1 mΩ), a resonance appears in which the loop length of the loop configured as described above is approximately 1 wavelength, and in the open (OPEN) state (for example, the resistance 108 is 1 MΩ) A resonance having a noise detection line length of approximately one wavelength appears. A plurality of resonances and anti-resonances appear in the frequency band less than 10 MHz including surge-like electromagnetic noise and the frequency of the signal device in the electromagnetic noise detection line 107 installed approximately 20 m to 25 m in length of the railway vehicle, and the dynamic range Reaches approximately 60 dB to 80 dB. On the other hand, the dynamic range can be suppressed to a range of about 6 dB by connecting via the resistor 108 of an appropriate resistance value (300 Ω in this analysis example). The resistor 108 not only eliminates the need for a high-accuracy measuring instrument with a wide dynamic range, but also reduces the risk of damage to the electromagnetic noise evaluation apparatus 106 due to excessive input.

Next, the detailed configuration and operation of the electromagnetic noise evaluation device 106 will be described with reference to FIGS. 4 and 5.
In a rail car, a specific operation control may be performed at a specific point, and it is difficult to immediately identify the origin of the electromagnetic noise that causes the error only by the on-board equipment error occurrence state and the occurrence point information. In the electromagnetic noise measurement system of the present embodiment, it is possible to identify an on-vehicle equipment error that is generated as an electromagnetic noise source from an external device such as a trackside equipment or a trackside device.

  As shown in FIG. 4, the electromagnetic noise evaluation device 106 includes a voltage acquisition unit 106 a, an arithmetic unit 106 b, and a recording unit 106 c. The voltage acquisition unit 106 a is a part that acquires a potential difference between two points. The calculation unit 106 b is a unit that performs calculation processing such as generating voltage data with position information by associating vehicle position information received from an external device such as the vehicle information management device 103 with data acquired by the voltage acquisition unit 106 a. The recording unit 106 c is a portion for storing voltage data with position information.

  It is desirable that the voltage data acquired by the voltage acquiring unit 106a be reduced in data size according to the data transfer speed to the recording unit 106c, the recording capacity, and the like. The voltage data may be data which can discriminate the time variation of the voltage generated in the electromagnetic noise detection line 107 regardless of the data format. The recording unit 106c may convert the voltage data of the frequency axis in the calculation unit 106b as data for evaluating electromagnetic noise, for example, and continuously record the same, or the same or similar vehicle control or vehicle It may be converted to differential data with the average voltage data of an arbitrary period under the upper equipment operating condition.

Next, processing for determining that the on-vehicle equipment error that has occurred is caused due to noise from the external equipment in the electromagnetic noise evaluation device 106 will be described using FIG. 5.
The voltage acquisition unit 106a of the electromagnetic noise evaluation device 106 acquires voltage data generated in the electromagnetic noise detection line 107 (S600).

  Next, the occurrence of an error of the on-vehicle device is detected from an external device such as the vehicle information management device 103 (S601). When an error occurrence of on-board equipment is detected from the external equipment (S601: Y), vehicle position information input from the external equipment such as the vehicle information management apparatus 103 is added to the measured voltage data and stored in the recording unit 106c. (S602).

  Next, it is determined whether the created voltage data with position information is not associated with the device operation information (S603). The fact that the voltage data with position information is not associated with the device operation information is determined, for example, because it does not interlock with a specific operation on the device.

  Next, when the created voltage data with position information is not related to the device operation information (S603: Y), the voltage data is compared with voltage data due to electromagnetic noise caused by devices in the vehicle before and after on the time axis. Then, it is determined whether the variation is small (S604). Here, it is assumed that the voltage due to the electromagnetic noise caused by the device in the vehicle is much larger than the voltage due to the electromagnetic noise caused by the external factor.

  Next, when it is determined that the voltage of the voltage data is smaller than the voltage due to the electromagnetic noise caused by the device in the vehicle (S604: Y), it is compared with the accumulated data of the recording unit 106c, It is determined whether there is an error record in which the vehicle position and the vehicle position information are close (S605: Y).

  Then, the created voltage data with position information is not related to the device operation information (S603: Y), the voltage of the voltage data is smaller than the voltage due to the electromagnetic noise caused by the device in the vehicle (S604: Y) When there is no error record in which the vehicle position and the vehicle position information are close to each other (S605: Y), it is determined that the electromagnetic noise is an electromagnetic noise from the external environment of the vehicle, for example, an external device S606).

  The above-described determination steps are repeated until the operation ends, and the on-board equipment error that occurs during traveling is continuously recorded (S607).

  Although S602 is performed based on the error judgment of the device of S601, acquisition and recording of voltage data are always performed, and when an on-vehicle equipment error occurs, error occurrence information is also added to the measured voltage data and recorded. It may be In addition, the amount of fluctuation to determine whether the electromagnetic noise in S604 is caused in the vehicle or in the external environment may be determined by a threshold determined based on the amount of electromagnetic noise at the time of the on-board equipment error occurrence in the past. desirable. In addition, when the position information is derived from GPS (Global Positioning System), the distance determination of the vehicle position in S605 is within the error range, and to transmit / receive information to / from the on-vehicle child by the ground child (ATS system etc. When it originates in signal information, such as a device installed on the ground, it is desirable to calculate a traveling point from the speed and elapsed time from the position information acquisition time point, and to judge by an arbitrary margin. The processing relating to the external noise determination from S603 to S606 may be performed in parallel, for example, by generating another process or another thread in response to the apparatus error occurrence interrupt of S601. Furthermore, in the condition determination from S603 to S605, the determination order may be changed, or when the electromagnetic noise detection line 107 exists outside the vehicle, the presence or absence of variation in external noise may be added to the determination condition.

  According to the configuration of the electromagnetic noise evaluation device 106 described above, the on-vehicle equipment error that occurs is obtained by acquiring the electromagnetic noise data inside and outside the vehicle in a wide range and processing this together with the equipment operation information and the vehicle position information. It is possible to reliably determine that the noise is generated from the device.

  As described above, according to the electromagnetic noise measurement system of the present embodiment, the electromagnetic noise inside and outside the vehicle can be acquired in a wide range with a minimum configuration, and the electromagnetic noise occurrence situation when the on-vehicle equipment abnormality occurs is analyzed. Can. That is, it is possible to provide an electromagnetic noise measurement system suitable for the configuration of a railway vehicle that is not subject to measurement conditions or positional constraints. Moreover, the generation of electromagnetic noise in each vehicle can be grasped independently.

Second Embodiment
The second embodiment according to the present invention will be described below with reference to FIGS. 6 and 7.
In the first embodiment, according to the configuration shown in FIG. 1, according to the configuration shown in FIG. 2, the resistor 108 is installed in size as shown in FIG. 2 to measure voltage and power at Port1 and Port2.

  In the electromagnetic noise measurement system of the present embodiment, as shown in FIG. 6, the electromagnetic noise detection line 107 connected to Port 1 and the electromagnetic antenna connected to Port 2 are installed, and the measurement results of different resistances 108 are shown. explain. The magnetic field antenna 300 is disposed parallel to the loop plane formed by the electromagnetic noise detection line 107 and the vehicle body 100 and at a distance of 2 m.

  It is an analysis result of the passage characteristic between the electromagnetic noise detection line 107 enclosed by the vehicle body 100 which is a metal structure shown in FIG. 7 and the magnetic field antenna 300 which simulates in-vehicle magnetic field noise.

In the case where the electromagnetic noise detection line 107 is laid near the ceiling of the vehicle body 100 as shown in FIG. 1, it is desirable to connect it near the floor surface of the vehicle body 100. That is, the loop area constituted by the electromagnetic noise evaluation device 106 to the electromagnetic noise detection line 107 to the vehicle body 100 to the electromagnetic noise evaluation device 106 is maximized so that the electromagnetic noise reception amount is larger and the reception range is wider. By setting the connection point between the resistor 108 and the vehicle body 100 so as to maximize the loop area, it is possible to acquire a wide range of magnetic field noise in the vehicle. In addition, the resistor 108 indicates that the loop formed in the vehicle can suppress the resonance generated at the time of magnetic field reception. That is, according to the results in FIG. 7, it is shown that the pass characteristic between Port 1 and Port 2 falls within a relatively gentle fluctuation range in the region where the frequency is 1 MHz or more.

Third Embodiment
Hereinafter, Embodiment 3 according to the present invention will be described with reference to FIG.
In the present embodiment, the electromagnetic noise detection line 107 is disposed along with the wire bundle 105 outside the vehicle. The vehicle body 100 is a metal structure, and it is difficult to evaluate electromagnetic noise outside the vehicle in the vehicle. One end of a single electromagnetic noise detection line 107 arranged along the outside of the vehicle pull-through electric wire bundle 105 is connected to the metal portion of the vehicle body 100 by a resistor 108, and the potential difference between the other end of the electromagnetic noise detection line 107 and the vehicle body 100 If acquired, electromagnetic noise inside and outside the vehicle can be acquired respectively. The wiring standard of the electromagnetic noise detection line 107 and the selection standard of the resistor 108 are the same as those in the example of the vehicle according to the first embodiment. Although FIG. 8 shows an example in which the electromagnetic noise detection line 107 is provided inside and outside the vehicle, it may be configured only outside the vehicle. In addition, although the outside pulling-out wire bundle 105 is shown as being disposed under the floor of the vehicle body 100, the roof of the vehicle body 100 and the structure forming the vehicle body 100 have a double skin structure. In the case where the bundle is pulled through, the electromagnetic noise detection line 107 may be arranged along the wire bundle in the truss.

Embodiment 4
Hereinafter, Embodiment 4 according to the present invention will be described using FIGS. 9 and 10.
The electromagnetic noise measurement system according to the present embodiment is an example in which two electromagnetic noise detection lines are used to acquire the electromagnetic noise inside and outside the vehicle.

  In the electromagnetic noise measurement system according to the present embodiment, as shown in FIG. 9, two sets of electromagnetic noise detection lines 107 together with the same in-vehicle lead-through wire bundle 104 and out-of-vehicle lead-through wire bundle 105 are used as resistors 108. An example is shown in which each is connected and arranged. Parasitic capacitance with the vehicle body 100 or the like, electromagnetic noise that receives the wire itself as an antenna, and the like are superimposed on the in-vehicle drawn wire bundle 104 and the out-of-vehicle drawn wire bundle 105. Since the loop formed by the electromagnetic noise detection line 107 is mainly along the wire bundle, the voltage acquisition unit of the electromagnetic noise evaluation device 106 mainly induces the voltage induced by the electromagnetic noise superimposed on the drawn wire bundle. It can be acquired. It is effective in the case of evaluating the common mode current on a specific wire bundle or in the case of acquiring the electromagnetic noise data excluding the potential fluctuation of the vehicle body 100.

  Further, in the electromagnetic noise measurement system according to the present embodiment, as shown in FIG. 10, in two or more in-vehicle draw-in wire bundles 104 disposed at a distance, they are disposed on the left and right of the vehicle to maximize the loop area. The electromagnetic noise detection lines 107 are disposed one by one for each wire bundle so as to be connected to each other by the resistor 108. Although FIG. 10 shows an example in which the present invention is applied to the in-vehicle pull-through wire bundle 104, the present invention may be applied to the out-vehicle pull-through wire bundle 105.

  According to the above configuration, in addition to the effects of the first embodiment, since two electromagnetic noise detection lines are used, measurement of electromagnetic noise in more specific situations becomes possible, and electromagnetic noise inside and outside the vehicle can be made in a wider range. It becomes possible to acquire. Furthermore, since it is not necessary to connect the electromagnetic noise detection line 107 to the vehicle, there is an advantage that the installation work becomes easy.

Fifth Embodiment
The fifth embodiment according to the present invention will be described below using FIGS. 11 and 12.
In the first embodiment, the process has been described in which the electromagnetic noise evaluation device 106 determines whether the generated electromagnetic noise is caused by the device inside the vehicle or the external environment. In the present embodiment, an example of an electromagnetic noise measurement system capable of issuing a warning when there is a risk of occurrence of an on-board equipment error by analysis of accumulated voltage data will be described.

  As shown in FIG. 11, the electromagnetic noise evaluation device 106 of the present embodiment is configured of voltage acquisition units 106a and 106d. The voltage acquisition unit 106 a is a part that acquires a potential difference between two points. The abnormality detection unit 106 d is a portion that receives vehicle control information, operation information of on-vehicle devices, vehicle position information, and the like from an external device such as the vehicle information management device 103. Further, the abnormality detection unit 106 d includes a determination parameter 106 f and an abnormality detection calculation unit 106 e. The determination parameter 106 f is data used for the determination calculation of the on-vehicle equipment error occurrence. The abnormality detection calculation unit 106e is a calculation processing unit that determines, for example, an on-board equipment error occurrence warning notification based on the voltage data from the voltage acquisition unit 106a and various data from the external device.

  It is desirable that the voltage data acquired by the voltage acquiring unit 106 a be reduced in data size in accordance with the processing period until the abnormality determination. The data format is not limited, as long as it is a data format capable of determining the time variation of the voltage generated in the electromagnetic noise detection line 107. In addition, when real-time property is not required for the abnormality determination, a recording unit (not shown) may be provided, and may be stored in the storage unit to evaluate the saved time series voltage data later.

Next, a process of notifying that there is a danger of occurrence of a device error due to the magnetic noise will be described with reference to FIG.
In the abnormality detection unit 106 d of the electromagnetic noise evaluation device 106, the voltage acquisition unit 106 a acquires voltage data generated in the electromagnetic noise detection line 107. Further, the abnormality detection unit 106d acquires vehicle control information, operation information of on-vehicle devices, vehicle position information, and the like from an external device such as the vehicle information management device 103 (S700). Based on the data acquired in S700 and the past data, the abnormality detection calculation unit 106e determines whether or not it is within the risk range of occurrence of a predetermined device error by processing applied the determination parameter 106f which is set and held based on the data and past data S701).

  When it is determined that there is a risk of occurrence of a predetermined device error (S701: Y), the process goes to S703, and when it is determined that there is no risk of occurrence of a predetermined device error (S701: N), the process returns to S700. .

When S701 is Y, it is determined whether an error of on-board equipment has occurred (S703), and when it is determined that an error of on-board equipment has occurred (S703: Y), supervised learning or half The determination parameter 106f is updated based on the information acquired by the abnormality detection unit 106d as supervised learning (S704), and when it is determined that an error of on-board equipment has not occurred (S703: N), on-vehicle equipment error occurs Is issued as a warning to the vehicle administrator etc. that the possibility of the problem is increasing (S705).
The steps of updating the determination parameter and issuing the warning are repeatedly performed until the operation is completed (S706).

  Since the voltage value obtained by the voltage acquisition unit 106a fluctuates due to the arrangement posture of the electromagnetic noise detection line 107, the determination parameter 106f uses voltage data of a car equipped with the electromagnetic noise measurement system, and the determination criterion in S701 It is desirable to set in any range based on a learning curve obtained as a result of teacher learning or semi-teaching learning. In addition, although information acquired from an external device is defined as a variable for teacher learning or semi-teacher learning, the operation and non-operation of equipment such as an inverter with a large amount of radiation noise is intended to reduce the calculation amount of the abnormality detection calculation unit 106e. A learning operation may be applied to each of the cases in response.

  According to the above configuration, it is possible to issue a warning when there is a risk of an on-vehicle equipment error occurrence, by applying the determination parameter based on the past data to electromagnetic noise data inside and outside the vehicle. It becomes.

Sixth Embodiment
The sixth embodiment according to the present invention will be described below with reference to FIGS. 13 to 15.
In the present embodiment, an electromagnetic noise measurement system is applied to a plurality of vehicles in a railway train formation, and a system in which the respective systems operate in synchronization with common time data will be described to be able to specify a noise generation car.

  FIG. 13 shows an example in which the electromagnetic noise measurement system is applied to two consecutive vehicles in the vehicle formation. And the electromagnetic noise measurement system of this embodiment synchronizes the electromagnetic noise evaluation devices 106 of each car at a common time in the configuration shown in FIG. Although the example which applies an electromagnetic noise measurement system to two continuous vehicles was shown in FIG. 13, it is good also as applying to a non-continuous vehicle of the same formation, and it is good also as applying to all vehicles.

  In FIG. 14, when the electromagnetic noise measurement system is applied to cars a and b, which are vehicles of the same formation, and the devices on the car a generate surge noise, the electromagnetic noises of the electromagnetic noise measurement systems of both cars are generated. It is an example of time series voltage data which noise evaluation device 106 acquires. Since the electromagnetic noise detection line 107 of each electromagnetic noise measurement system constitutes a closed loop in each vehicle, independent electromagnetic noise data can be acquired in each car. The noise generated by the car a reaches the car b at a time interval Δt because it passes through a path that directly reaches through the space, a path that travels through a wire passed between vehicles, and the like. If the time axis, which is the horizontal axis in this figure, is synchronously corrected by common time data, it is possible to determine Δt, and it is possible to specify a car as an electromagnetic noise source. The data used for comparison is not limited to time-series voltage data, and may be in a format that can determine Δt. For example, Δt may be obtained by acquiring only a time when a predetermined voltage change amount is detected.

Here, as shown in FIG. 15, it is assumed that cars a through d are connected to the same train, and the generation of electromagnetic noise due to the electronic equipment of car b causes surge noise in each car , T _a , t _b , t _c , and t _{d are} assumed to be recorded.
At this time, the following (Expression 1) is established from the distance of propagation of voltage.

  As described above, since the lag occurs at the time when the surge noise occurs as the vehicle is further away, by measuring the time when the surge noise occurs, it is possible to find out the car that is the cause of the generation of the electromagnetic noise.

  According to the above configuration, it is possible to identify the propagation path of the electromagnetic noise and, in turn, the car serving as the electromagnetic noise generation source by acquiring the electromagnetic noise inside and outside each vehicle in a plurality of vehicles of the same formation.

100: Car body 101: Under floor equipment 102: Car equipment space 103: Vehicle information management device 104: In-car lead-in electric wire bundle 105: In-vehicle outer lead-out electric wire bundle 106: Electromagnetic noise evaluation device 106a: Voltage acquisition unit 106b: Arithmetic unit 106c ... Recording unit 106 d ... abnormality detection unit 106 e ... abnormality detection calculation unit 106 f ... determination parameter 107 ... electromagnetic noise detection line 108 ... resistance 109 ... ground line 110 ... binding section

Claims (9)

An electromagnetic noise measurement system for railway vehicles that measures electromagnetic noise generated on railway vehicles,
An electromagnetic noise detection line disposed together with any of a bundle of wires drawn and fixed in at least one of the inside and the outside of the train of the rail car formation;
And an electromagnetic noise evaluation device including a voltage acquisition unit for acquiring a potential difference between two points;
One end of the electromagnetic noise detection line is connected to the metal part of the vehicle body via a resistor, and the other end is connected to the electromagnetic noise evaluation device,
The electromagnetic noise measurement system that the voltage acquisition unit acquires a potential difference between the other end of the noise detection line and the vehicle body.   The electromagnetic noise measurement system according to claim 1, wherein the electromagnetic noise detection line uses an unused wire bundle. And a vehicle information management device for holding vehicle control information and operation information of on-vehicle devices,
The electromagnetic noise measurement system according to claim 1, wherein the electromagnetic noise evaluation device acquires at least one of vehicle control information and operation information of on-vehicle equipment from the vehicle information management device.   The electromagnetic noise evaluation apparatus has a recording unit for storing electromagnetic noise data and the like acquired by the voltage acquisition unit, acquires vehicle position information from the vehicle information management apparatus or other on-vehicle equipment, and acquires the voltage The electromagnetic noise measurement system according to claim 3, wherein the electromagnetic noise data acquired by the unit and the vehicle position information are associated with each other and recorded in the recording unit.   The electromagnetic noise evaluation apparatus includes an abnormality detection unit that relatively determines an abnormality of the electromagnetic noise data acquired by the voltage acquisition unit based on a determination parameter, the determination parameter is held by the abnormality detection unit, and the electromagnetic The electromagnetic noise measurement system for a railway vehicle according to claim 1, wherein the system is updated based on the operation status of the on-vehicle equipment acquired by the noise evaluation device.   The electromagnetic noise measurement system for railway vehicles is disposed on a plurality of two or more vehicles in a railway train formation, and the respective systems operate synchronously with common time data. Noise measurement system. An electromagnetic noise measurement system for railway vehicles that measures electromagnetic noise generated on railway vehicles,
A set of two electromagnetic noise detection lines respectively arranged together with any of the wire bundle drawn and fixed in at least one of the inside and the outside of the railcar formation.
And an electromagnetic noise evaluation device including a voltage acquisition unit for acquiring a potential difference between two points;
One ends of the two electromagnetic noise detection lines are connected to each other via a resistor,
The electromagnetic noise measurement system wherein the voltage acquisition unit acquires a potential difference between the other ends of the two electromagnetic noise detection lines.   The electromagnetic noise measurement system according to claim 7, wherein the electromagnetic noise detection line uses an unused wire bundle. And a vehicle information management device for holding vehicle control information and operation information of on-vehicle devices,
The electromagnetic noise measurement system according to claim 7, wherein the electromagnetic noise evaluation device acquires at least one of vehicle control information and operation information of on-vehicle equipment from the vehicle information management device.

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