WO2003028299A1

WO2003028299A1 - Information transmitter of rolling stock

Info

Publication number: WO2003028299A1
Application number: PCT/JP2002/009733
Authority: WO
Inventors: Masahiro Nagasu; Yutaka Sato; Mutsuhiro Terunuma; Hiroyuki Akiyama
Original assignee: Hitachi, Ltd.
Priority date: 2001-09-25
Filing date: 2002-09-20
Publication date: 2003-04-03
Also published as: KR100610641B1; KR20040032932A; CN1541468A; JPWO2003028299A1

Abstract

The data communication of vehicles such as a rolling stock wherein vehicles are separated and connected repeatedly and noise-generating apparatuses such as an inverter are mounted under the floor is carried out through a network. Vehicles communicate date with a modulation wave signal that is a carrier wave signal modulated by a data signal (baseband signal). Since the frequency of a modulation wave signal is set much higher than a noise frequency, the data transmission between vehicles is carried out without being influenced by a noise.

Description

Specification

Railway vehicle information transmission device

The present invention relates to a railway vehicle information transmission device capable of performing high-speed, large-capacity transmission with high accuracy without being affected by noise. Background art

For railway vehicles, the number of vehicles per train is adjusted according to the number of passengers in order to eliminate waste of operation. For this reason, vehicles are frequently separated and connected. Also, during periodic inspections of vehicles, separation and consolidation are carried out in order to maintain the vehicles separately. In order to cope with such an operation form, connecting devices (signal connecting devices) and pneumatic connecting devices for transmitting information between vehicles are installed in front of and behind the vehicles in addition to mechanical connecting devices. .

As the signal connection device, one that mainly connects with pins and connectors is used. However, after disconnection, the connection terminal surface is oxidized due to prolonged exposure to the outside air, and an oxide film is generated. Since the oxide film is an insulator, the electrical connection between the connection terminals is hindered when the vehicle is connected again. For this reason, poor connection has occurred, which is a major obstacle to railway operation.

In recent railway vehicles, drive units, power supply units, and air-conditioning equipment have been converted to inverters, generating noise from several Hz to several tens of MHz. Inverted noise source equipment is usually installed under the vehicle floor.

Railway vehicles use networks to communicate data such as control signals (including maintenance signals) and service signals (media signals). In a data communication device, communication errors are less likely to occur in a vehicle due to a shielding effect of a vehicle body made of metal. However, vehicles are connected by couplers and wiring. The shielding effect is reduced. As a result, noise is applied to the wiring connecting the communication devices in the vehicle, and communication errors occur.

Data communication of control signals (including maintenance signals) and service signals (media signals) on railway vehicles via networks is described in the magazine “Rail Vehicles and Technology”, NO. It is described on page 8.

It is known that in order to prevent connection failure of a connection device (signal connection device), a voltage exceeding 10 V is applied to electrically destroy an oxide film. Specifically, a high voltage exceeding 10 V is applied at the beginning of vehicle connection, and thereafter information is transmitted at a voltage of several volts, or information is constantly transmitted at a voltage exceeding 10 V. It is also widely practiced to prevent poor contact by plating the surface of the connection terminal with a soft conductive material such as gold which is not easily chemically changed.

Applying a high voltage exceeding 10 V only at the beginning of connection, and then communicating information at a low voltage of several volts, simply applying the high voltage in the initial stage does not sufficiently destroy the oxide film, causing contact failure again. There is a risk of doing. The device for generating a high voltage, the communication device of low voltage, and requires a device to switch between them, the configuration is complicated _(the other hand, a method of transmitting a high voltage exceeding always 1 0 V is active the output stage The power loss of the device increases, and the larger the amplitude of the voltage, the faster the output stage of the transistor is required. Transmission is difficult to achieve.

In order to prevent contact failure of the connecting device, it is conceivable to provide an antenna in the connecting device and perform wireless communication between vehicles. High-speed and large-capacity data communication of railway vehicles is being studied, and the use of a high-speed broadband network is being studied. The frequency of the data signal is about 100 to 100 MHz, and is affected by the noise of the noise generator that has been integrated.

An object of the present invention is to provide a railway vehicle information transmission device capable of performing high-speed, large-capacity transmission with high accuracy without being affected by noise in railway vehicles in which connection and disconnection between vehicles are performed. . Disclosure of the invention

A feature of the present invention is that data communication between vehicles is performed using a modulated wave signal obtained by modulating a carrier wave with a data signal (paceband signal).

Since the modulated wave signal can be set to an extremely high frequency with respect to the noise frequency, data transmission between vehicles can be performed without being affected by noise. If a high-frequency carrier is transmitted using a modulated wave signal modulated by a paceband signal, the frequency can be limited to a band required for data transmission by a bandpass filter, and communication can be performed even when the voltage amplitude is small. Therefore, high-speed, large-capacity transmission (broadband communication) can be performed accurately without being affected by noise. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a signal transmission device of the present invention, FIG. 3 is a cross-sectional view showing an example of a signal connection device, and FIG. FIG. 5 is a cross-sectional view showing another example of the signal connection device, FIG. 6 is a configuration diagram showing one example of the signal connection device, and FIG. 7 is another view of the signal connection device. FIG. 8 is a block diagram showing an essential part of another embodiment of the present invention, FIG. 9 is a specific block diagram of a railway vehicle employing the present invention, and FIG. FIG. 11 is another specific configuration diagram of a railway vehicle employing the present invention, FIG. 11 is another specific configuration diagram of a railway vehicle employing the present invention, FIG. FIG. 13 is a detailed configuration diagram of another example of the driving device, FIG. 14 is a configuration diagram of an example of the voltage detector built in the wireless device, and FIG. 15 is a detailed configuration diagram of another example of the driving device. BEST MODE FOR CARRYING OUT THE INVENTION

1 to 3 show one embodiment of the present invention. FIG. 1 is a block diagram of a network of the present invention, FIG. 2 is a detailed block diagram of an example of a wireless transmission device, and FIG. 3 is a diagram of an example of a signal connection device. In FIG. 1, reference numeral 1 denotes a network configuration in one train of a railway car, which includes a network control device 15 and two wireless transmission devices 14 (A, B). The network control device 15 controls data transmission of control signals (including maintenance signals) and service signals, and communicates with the wireless transmission device 14 through a network cable 18 (IEEE1394, Ethernet cable, etc.). Connected. The network connection with the connected adjacent vehicle is performed via a wireless transmission device 14, and a coaxial cable 17 having excellent high-frequency transmission characteristics is used as a connection cable.

An Ethernet cable or the like is used to connect the network control device 15 and the wireless transmission device 14, and a baseband signal is used for signal (data) transmission. A modulated wave signal obtained by modulating a carrier with a baseband signal is used for information transmission of the wireless transmission device 14 between the vehicles. A paceband signal is a signal that transmits information using 0 and 1, depending on the encoding method, and usually has a signal band component from DC to several hundred MHz. On the other hand, the modulated wave signal is a modulated wave signal obtained by modulating a carrier signal with a data signal, and can be converted to a desired frequency by selecting a frequency of the carrier signal.

In railway vehicles, many noise devices are used, such as a high-voltage inverter driving device that drives the vehicle and a power supply that supplies power inside the vehicle, so there is a large noise of several 10 MHz or less. . Therefore, baseband transmission is more susceptible to this noise.

Inside the vehicle, the body is made of metal, so it is less affected by comparative noise due to this shielding effect. However, there is no shielding effect between the bodies and the effect of noise increases. Therefore, a modulated wave signal with a higher frequency than the noise source is used for transmission between vehicles. Wiring in the vehicle uses baseband transmission, which can be prepared at relatively low cost.

Conventionally, transmission was performed with a voltage amplitude of around 10 V to prevent transmission errors between vehicles, but in this case, it is practically difficult to achieve high-speed transmission exceeding 10 Mbps. It is. On the other hand, by using modulated wave transmission for transmission between vehicles, a high-speed vehicle network exceeding 100 Mbps can be realized. FIG. 2 shows a detailed configuration of an example of the wireless transmission device 14, and the network control device 15 includes a router, a hub (HUB), a server, and the like. The data transmission device 19 2 of the wireless transmission device 14 is connected to the network control device 15 via the cable 18. The data signal from the data transmission device 1992 is modulated by the modulator 1993, converted to a desired frequency by the frequency conversion amplifier 1994, and amplified.

The modulated wave signal amplified by the frequency conversion amplifier 194 removes an unnecessary signal in a pass filter 195 and is sent to a circuit 196. Sirki Yure 1960 has directivity in signal transmission, transmits the modulated wave signal that has passed through the no-pass filter 1995 to the coaxial cable 17 and transmits the modulated wave signal received from the coaxial cable 17 to the bandpass filter 1. Transmit to bandpass filter 197 on the receiving side without transmitting to 95.

The modulated wave signal transmitted from the adjacent vehicle is sent to the bandpass filter 197 on the receiving side through the sensor 196, and the signal unnecessary for communication is removed. The modulated wave signal that has passed through 197 is converted into a frequency that can be easily demodulated by a frequency conversion amplifier 198 and amplified, and a data signal is extracted from the modulated wave signal by a demodulator 119.

The data transmission device 1992 performs a data bridging process between the modulator 1993 and the demodulator 1999 and the network control device 15. Specifically, when the data signal from the network control device 15 is a serial signal, data extraction and clock reproduction are performed and transmitted to the modulator 1993. Similarly, clock recovery and the like are performed on the overnight signal from the demodulator 1999, and the signal is transmitted after being made compatible with the communication method of the network processing device 15.

Note that the data transmission device 192 may have a memory and store and process the data. However, if the data is a vehicle control signal, it is desirable to reduce the delay time. Specifically, it is desirable to set it to 10〃s or less.

It is not absolutely necessary to use Sirky Yule 1960, and a mixer can be used. You. However, for railway vehicles, it is desirable from a practical point of view to provide Sirki Yure 1976 for the following reasons.

For railway vehicles, an electrical connection device is required at the connection of the transmission line to split and merge the vehicles. This is not a problem with a uniform transmission line such as a coaxial cable, but it is difficult to make an electrical connection device that requires splitting and merging uniformly, causing impedance mismatch and reflection at this point. The reflected signal returns to the transmitting side, causing a malfunction of the amplifier circuit in the transmitting section. In order to prevent this, Sirkyle 196 is used.

Although FIG. 2 shows a case where transmission and reception are performed by one coaxial cable 17, transmission and reception may be performed by another coaxial cable. In such a case, use an isolator for the transmitter to prevent the transmission signal from returning. Next, setting of a frequency used for transmission between vehicles will be described. As shown in FIG. 1, since the wireless transmission device A of one vehicle is connected to the wireless transmission device B of another adjacent vehicle, the output signal (modulated wave signal) of the wireless transmission device A is transmitted by the wireless transmission device. The output signal (modulated wave signal) of the wireless transmission device B received by B is received by the wireless transmission device A.

In transmission using carrier signals, the transmission and reception carrier frequencies of the wireless transmission device 14 are separated, and the signal transmitted by the bandpass filter 197 on the receiving side is removed, because it is necessary to prevent signal degradation. There is a need to.

In addition, when transmitting a control signal (control data) for controlling a vehicle, reliability is required. Therefore, it is common practice to use a double network for the network. In the case of a double system, it is necessary to use different frequencies for the first system and the second system in order to prevent signal interference at the signal connection device. Therefore, it is necessary to transmit at least four types of frequencies, and four types of wireless transmission devices 14 are required. The frequency of the carrier signal is set as follows in order to halve the types of the wireless transmission devices 14.

FIG. 4 is an example of the frequency allocation of the carrier signal for halving the types of the wireless transmission devices 14. In this case, the carrier frequency from wireless transmission equipment A to B is set to band 1 F1 for system 1 and fl 2 for system 2. In addition, the carrier frequency from B to A is selected from the band 2 of the radio transmission apparatus, and the system 1 is f 21 and the system 2 is 22. Further, the pass band of the bandpass filter 195 on the transmitting side in the wireless transmission device A is frequency band 1, the passband of the bandpass filter 197 on the receiving side is frequency band 2, and the wireless transmission device B The passband of the bandpass filter 195 on the transmission side in the frequency band 2 is that of the bandpass filter 195 on the transmission side, and the frequency band 1 is that of the bandpass filter 197 on the reception side.

In this way, a dual network can be configured with two different types of wireless transmission devices having different node paths.

FIG. 3 shows a detailed example configuration of the signal connection device 2 of the vehicle connection unit.

The wireless transmission device 14 and the drive device 16 are connected to the network control device 15 through a network cable 18. The driving device 16 is used to drive the entire device. The connection between the network control device 15 and the wireless transmission device 14 uses IEEE1394 or Ethernet, and the connection between the network control device 15 and the drive device 16 uses CAN (Control Area Network) or DeviceNet. A network suitable for real-time control is used.

A transmission line 17 (generally a coaxial cable) is connected to the wireless transmission device 14, and an antenna 11 is connected to the transmission line 17. Further, the antenna 11 is arranged so as to face another antenna 11 of another vehicle constituting the electric connection device 2. Another antenna 11 of another vehicle is connected to a radio transmission device 14 via a transmission line 17. The wireless transmission device 14 of another vehicle is also connected to the network control device 15 by the network cable 18.

The signal connection device 2 is formed in an electromagnetic shield structure, and the antenna 11 is electrically shielded by an electromagnetic shield material 12 made of a conductive material such as a metal. The antenna 11 is surrounded by shielded wood 12. An electromagnetic wave absorbing material 19 is provided between the electromagnetic shielding material 12 and the antenna 11, and the antenna 11 is an insulator 13 such as polyethylene air and the electromagnetic shielding material 12 and the electromagnetic wave absorbing material. 1 9 And insulated.

The wireless transmission device 14 modulates a high-frequency carrier wave (generally a sine wave) with a baseband signal (de-night signal) transmitted from the network control device 15 and converts the modulated signal to a transmission line. Send to 17 There are many modulation methods such as ASK (Amplitude Shift Keying) modulation, which changes the amplitude of the carrier depending on the magnitude of the code, and PSK (Phase Shift Keying), which changes the phase of the carrier.Either method can be used. .

The modulated wave signal transmitted from the wireless transmission device 14 is radiated by the antenna 11 and received by the other antenna 11. The modulated wave signal received by the other antenna 11 is demodulated by the wireless transmission device 14 of the other vehicle, a paceband signal is extracted, and is applied to the network control device 15.

The connection device 2 shown in FIG. 3 configures a signal connection between vehicles exposed to the outside air with an antenna 11, and communication is performed by transmitting a signal to the antenna 11 for modulation. Therefore, there is no need to electrically connect the networks between the vehicles, and the problem of poor contact can be avoided.

Important information (control signals) such as the drive unit 16 and brakes is transmitted to the network between the vehicles. For this reason, if communication is interrupted due to external disturbances, there will be a serious problem such as stopping the operation of vehicles. To prevent this, the antenna 11 is surrounded by an electromagnetic shielding material 12 such as a metal. In addition, even if the electromagnetic shielding members 12 of adjacent vehicles (front and rear vehicles) are in mechanical contact and are electrically connected, the influence of noise can be prevented.

The electromagnetic shielding material 12 prevents radio waves radiated from the antenna 11 from being radiated to the outside, but reflects the radio waves. The modulated wave radiated from one antenna 11 is directly received by the other antenna 11 and the direct wave directly directed to the other antenna 11 and the reflected wave reflected by the surface of the shield material 12 are received. The other antenna 11 receives the direct wave and the reflected wave, and radio wave interference occurs on the antenna surface, so that the receiving performance is significantly reduced. The electromagnetic wave absorber 19 prevents this, and is installed between the antenna 11 and the shield 12. Electromagnetic waves radiated from the antenna 11 in the direction of the shield material 12 are absorbed by the absorber 19 and are not reflected by the shield material 12. Therefore, the other antenna 11 receives only the direct wave, and there is no interference between the direct wave and the reflected wave, so that the deterioration of the receiving performance can be prevented.

Note that the electromagnetic wave absorber 19 is not always necessary, and the geometric structure of the antenna 11, the insulator 13 and the shielding material 12 is devised, and the waveguide between the two antennas 11 is devised. Even if such an electromagnetic wave transmission path is formed, interference between a direct wave and a reflected wave can be prevented.

Further, it is preferable that the antenna 11 used for the connection device 2 is small, and the antenna 11 can be reduced in size by processing the antenna 11 into a spiral shape. However, the size of the antenna 11 is limited to about 1/10 of the wavelength.

Further, it is desirable that the carrier wave is at least about 10 times the carrier wave (paceband signal). At present, the transfer rate of a practically used network is at least about 10 MHz, and it is preferable to use a carrier frequency of 100 MHz or more. Thereby, the size of the antenna 11 can be made at least about 30 cm.

When two-way communication is performed using a pair of antennas 11, two-way (octagonal and B-direction) communication is performed in a time-sharing manner. In the case of the A-direction communication, the wireless transmission device 14 on the left side in the figure is a transmitting device, and the wireless transmission device 14 on the right side in the figure is a receiving device. In the direction B, the left side is the receiving device and the right side is the transmitting device. Such a method of performing two-way communication by time division is called half-duplex communication.

It is also possible to always perform two-way communication with a pair of antennas. This is called full-duplex communication. In this case, two transmission frequencies f 1 and f 2 are multiplexed on one transmission line 17. For example, assign frequency 1 for A-direction transmission and frequency 2 for B-direction communication. The wireless transmission device 14 on the right side of the figure modulates the carrier f 1 and transmits it to the transmission line 17. At step 7, the signal f2 is extracted and demodulated. The wireless transmission device 14 on the right side in the figure modulates and transmits the carrier wave f2, and transmits and demodulates: f1 at the first pass filter 197.

FIG. 5 shows another example of the connection device 2.

The connection device 2 shown in FIG. 5 includes a plurality of antennas 11. Fig. 5 (a) has two pairs of antennas 11 and performs bidirectional communication at different frequencies fKf2. For example, communication is performed from left to right in the figure at frequency 1 and from right to left in the figure at frequency 2. Therefore, full-duplex communication is possible.

FIG. 5 (b) is an example in which the connection device 2 includes a large number of antennas 11. By communicating at different frequencies fl to fn, high-speed bidirectional communication can be achieved. Generally, the communication speed of the wireless communication device 14 is lower than that of wired communication. Therefore, wireless communication often degrades the performance of the entire network. If the communication speed of the wired communication using the network cable 18 is 100 Mbps in the half-duplex communication method and the communication speed per pair of wireless communication antennas is 10 Mbps in the half-duplex communication method, set the antenna 11 to 1 By providing 0 sets, performance degradation due to wireless communication can be prevented.

FIG. 6 is a configuration diagram showing an example of the connection device 2, in which FIG. 6 (a) is an external view and FIG. 6 (b) is a cross-sectional view of a connection portion.

One connecting device 2A is configured as follows. An electromagnetic shielding material 12 A made of metal or the like is disposed around the antenna 11 with an insulator 13 interposed therebetween to prevent electromagnetic waves from being radiated from the antenna 11 to the outside and the influence of the external electromagnetic waves. An electromagnetic wave absorbing material 19 shown in FIG. 3 can be provided on the inner surface of the electromagnetic shield material 12A, and can be often used.

To insert and electrically connect one connecting device 2A to the other connecting device 2B, the shield material 1 2B of the other connecting device 2B must be shielded from the one connecting device 2A. The diameter of the material is larger than 12 A. Further, the antennas 11 of the connection devices 2A and 2B are arranged so as to face each other. Antenna 1 1 Is connected to a transmission line 17. Note that the transmission line 17 is connected to the wireless transmission device 14.

By forming a plurality of antennas 11 on one connection device 2A, 2B as shown in FIG. 6, a plurality of connections can be made simultaneously.

FIG. 7 is a configuration diagram showing another example of the connection device 2. As shown in FIG. FIG. 7 (a) is an external view, and FIG. 7 (b) is a cross-sectional view of a connecting portion.

FIG. 7 shows a configuration in which electrical connections are made by pins instead of antennas. FIG. 7 shows the antenna 11 of FIG. 6 with pin-type connection terminals 22 and 23. The female connection terminals 22 are electrically connected to each other by being inserted into the female connection terminals 23. The connection terminals 22 and 23 are connected to the wireless transmission device 14 by the transmission line 17. In this case, a wired signal transmission device is used as the wireless transmission device 14.

The pin-type connection terminals 22 and 23 are provided for electrically connecting each other. When a railway vehicle is disconnected from the connection terminals 22 and 23 and exposed to the open air for a long time, the surfaces of the pins 22 and 23 are oxidized and a contact failure occurs. When a contact failure occurs, only the current flowing through the parasitic capacitance between the pins 22 and 23 is generated, and the amplitude value of the voltage drops from 110 to 1/1000.

In transmission using a baseband signal from the network control device 15, a code is restored by determining whether a received signal is higher or lower than a certain potential with reference to a certain potential. Therefore, it is impossible to determine the data even if the received signal is reduced by a factor of several. On the other hand, when communication is performed using a modulated wave signal modulated by the signal transmission device 14, communication can be normally performed even if the signal level is reduced to about 1/1000. Data communication between railway cars is performed in this way, and data communication between cars is performed using a modulated wave signal obtained by modulating a carrier wave at a data frequency (baseband signal). Since the modulated wave signal can have an extremely high frequency with respect to the noise frequency, data transmission between vehicles can be performed without being affected by noise. ₍ Also, if a high-frequency carrier wave is transmitted with a modulated wave signal modulated with a baseband signal, , The frequency can be limited by the bandpass filter to the band required for data transmission, and communication is possible even when the voltage amplitude is small. Therefore, high-speed and large-capacity transmission of information between railway cars can be accurately performed without being affected by noise.

Next, the driving device used for railway vehicles is driven with a voltage of several kV and a voltage of several hundred A or more, so that a large potential difference occurs between the vehicles. Therefore, when the connection device 2 electrically connected as shown in Fig. 7 is used, the current (DC) between the signal transmission devices (wired signal transmission devices 14 corresponding to the radio transmission devices 14) of each vehicle is increased. Current flows, and parts of the signal transmission device 14 are damaged.

FIG. 8 shows an embodiment for solving such a problem. FIG. 8 shows an example in which the connection device 2 uses an antenna.

As shown in FIG. 8, an insulating device 25 for separating between the signal transmission device 14 and the connection device 2 is provided to cut off the DC component.

FIGS. 8 (b) and 8 (c) show specific examples of the insulating device 25. FIG. A transformer or a capacitor is used as the insulating device 25. 27 is an amplifier.

In the case of the transformer in Fig. 8 (b), high-frequency signals are transmitted to each other by the transformer, but direct current is blocked by the transformer. Fig. 8 (c) In the case of a capacitor, adding a capacitor to both the signal and the ground allows only high frequencies to be transmitted to each other and blocks direct current.

For high-frequency transmission with a frequency exceeding GHz, the transformer capacitor is not a discrete component but a pattern capacitor formed on a substrate using a pattern wiring.

9 and 10 show a more specific configuration of a railway vehicle employing the present invention. FIG. 9 shows a case where the number of connecting devices 2 is one, and FIG. 10 shows a case where there are two sets. Note that the connection device 2 describes an example of a pair of antennas, but a connection device 2 in which a plurality of antennas are arranged as shown in FIG. 5 can also be used.

In FIG. 9, the antenna 51 is connected to the pre-wired radio transmission device 14 B, and the bridge-type radio transmission device 14 B is further connected to the network control device 15. Have been. The network control device 15 is connected to a local network (LAN) 58 including a wireless transmission device 30 and a reception device 31. LAN 58 is wirelessly networked. The LAN 58 is referred to as an information LAN because its main purpose is to transmit image information and text data.

In the network control device 15, a drive device 16 and an operation control device 32 are connected. In addition, the network control device 15 is connected to the repeater-type wireless transmission device 14R, and the electrical connection device 2 is connected to the repeater-type wireless transmission device 14R. Here, in the LAN in which the driving device 16 and the operation control device 32 are connected, the control data of the vehicle device is transmitted, so that the control device is referred to as a control LAN 59. The left side in FIG. 9 is the preceding vehicle, and the right side is the following vehicle. The network configuration of the following vehicle is the same as that of the preceding vehicle, and a description thereof will be omitted. Also, in an actual railway vehicle, multiple vehicles may be connected as needed, and may exceed 16 vehicles.

First, the bridge type wireless transmission device 14B and the repeater type wireless transmission device 14R will be described.

The bridge type wireless transmission device 14B has a function of analyzing received information and transmitting data only to ports that need to transmit. On the other hand, the repeater-type wireless transmission device 14R is a device for relaying the received data, and the data received from the input terminal is transmitted from the output terminal as it is just after the waveform shaping.

Therefore, the bridge-type wireless transmission device 14B requires an operation of recording data in a memory and analyzing the data, and it takes a long time before the input data is output. On the other hand, the repeater-type wireless transmission device 14 R shapes the input signal waveform and transmits it as it is, so the delay time between the input terminal and the output terminal is reduced.The information is analyzed to determine the presence or absence of data transmission. There is Lu Yu as a device to do it. The bridge-type wireless transmission device 14B knows the port to which each device is connected, and transmits data only to the port to which the device to which data is to be transmitted is connected. On the other hand, in the evening, we know the network and transmit data only to the network to which data should be transmitted. The antenna 51 is used for communication between the train and the outside. For example, by communicating with a communication device installed at the platform of a station, information on the ground can be transmitted to the vehicle and information in the vehicle can be transmitted to the ground. The information to be transmitted can be classified into information used in the information LAN 58 and information used in the control LAN 59. Information used by the information LAN 58 includes image information such as movies, news, and passenger information. The information used on the control LAN 59 includes equipment maintenance information such as control unit temperature and failure information.

By transmitting information with the ground using the antenna 51, it is possible to sequentially switch image information and news information within Ningyo as needed. On the ground side, on the other hand, by receiving the status of the vehicle in the event of a vehicle failure, the ground specialists will be able to accurately grasp the status and take prompt measures. Image information transmitted from the ground can also be recorded on a hard disk installed in the vehicle. As a result, even in an environment where communication between the vehicle and the ground is not always possible, image information services can be provided to passengers at all times.

Note that, even in the case of FIG. 9, the wireless transmission device 14 connected to the antenna 51 is not necessarily the ridge-type wireless transmission device 14B, and if the transmission delay is within the time required by the control LAN 59, the repeater A type wireless transmission device 14R can also be used. Alternatively, a bridge-type wireless transmission device 14B and a network control device 15 that are integrally configured may be used.

FIG. 10 shows the connection device 2 for transmitting information on the information LAN 58 and the control LAN 5.

9 is an example of a configuration in which a connection device 2 for transmitting 9 pieces of information is separated.

The antenna 51 is connected to the bridge type wireless transmission device 14B. The network controller 15 on the information LAN 58 side and the network controller 15 on the control LAN 59 side are independently connected to the bridge type radio transmission apparatus 14B. The information LAN 58 is connected to the information LAN 58 of the following train by the connecting device 2, and the control LAN 59 is connected to the control LAN 59 of the following train through the connecting device 2. Information on the preceding and succeeding trains A type-type wireless transmission device 14B is used, and a repeater-type wireless transmission device 14R is used as a wireless transmission device connecting the control LAN 59.

Information Information communicated by LAN59 does not matter even if a time delay occurs between vehicles. In addition, it is often not necessary to transmit all information to subsequent trains. For this reason, although the transmission delay increases, it is desirable to use a pre-wired radio transmission apparatus 14B having a function of determining whether or not there is overnight transmission.

The control LAN 59 needs to coordinate multiple devices. Specifically, a driving device 16 and a braking device (not shown) are connected. For example, when the vehicle is stopped, information is mutually transmitted between the driving device 16 and the braking device to drive the vehicle. Coordinated control such as the braking device supplementing the braking force that the device 16 lacks. Therefore, in the control LAN 59, it is necessary to minimize the data transmission delay. Specifically, it is desirable to keep the total train speed at 10 ms or less. Therefore, it is preferable to use a repeater-type wireless transmission apparatus 14 R having a short transmission delay for the control LAN 59. FIG. 11 shows an example in which open-type antennas 52 and 53 are used as connecting devices for information LAN 58.

As described above, in the information LAN 58, an overnight transmission delay may occur. In the case of an open antenna, communication failure may occur due to the influence of external radio waves. However, even in such a case, the lost data can be restored by resending the data.

Further, the antenna 51 for wirelessly transmitting with the ground-side device can be installed inside or outside the vehicle. Fig. 9 and Fig. 10 show an example of installation inside a vehicle, for example, above a windshield in the driver's seat. Glass allows electromagnetic waves to pass, so it does not interfere with terrestrial communications. When installed outside the vehicle as shown in Fig. 11, there is an effect that the communication distance can be lengthened because obstacles such as glass are eliminated.

FIG. 12 shows an example of the detailed configuration of the driving device 16.

In FIG. 12, the power converter 100 supplied with power from the overhead wire 104 is The output controlled by the variable voltage and the variable frequency is supplied to the induction motor 103. Although not shown here, the induction motor 103 is mechanically connected to the wheels of the vehicle (electric vehicle), and controls the vehicle according to the output of the power converter 100. The drive device 16 has a speed sensorless system that controls the induction motor 103 by estimating the rotation speed from the constant and the current value of the induction motor 103.

The control device 101 includes an operation pattern sent from the operation control device 32, each phase output current detected by the current detector (CT) 109, and a filter capacitor detected by the voltage detector (PT) 110. Voltage ECF is input. The control device 101 controls the electric vehicle by performing feedback control based on the information, converting the result into a gate signal, and outputting the gate signal to the power converter 100.

Here, the filter reactor (FL) 107, filter capacitor (FC) 108, power converter 100, and control device 101 are called underfloor equipment because they are installed below the vehicle body. I have. Since the control device 101 of the underfloor equipment needs to be connected to the operation control device 32 installed in the cab, it is necessary to wire the inside of a complicated vehicle over a long distance.

In addition, since the power converter 100 uses a high-speed switching element such as an IGBT (Insulated Gate Bippo 1ar Transistor), a large switching noise is generated. Noise, it is necessary to improve noise resistance.

The processing cycle of the control of the drive unit 16 requires a high speed of several hundred 2 s. Therefore, each phase output current detected by the current detector (CT) 109 and the voltage detector (PT) 110 It is necessary to detect the feed-back signal such as the filter capacitor voltage ECF detected in step 2 at high speed. On the other hand, the pattern information from the operation control device 32 may have a cycle of about 10 ms, and does not require a high-speed response.

Wireless transmission is generally slower than wired transmission, but does not require wiring. The wireless transceivers 105 and 106 are connected to the operation control device 32 and the control device 101, and the pattern information from the operation control device 32 is wirelessly communicated. JP02 / 09733

17 and wiring problems. Assuming that 16 pieces of 16-bit data (160 bits) are transmitted at a cycle of 1 ms, the communication rate is 160 kbps. It is desirable to use wireless communication equipment of at least 16 Okbps or more for communication of pattern information.

Relatively low-speed communication is sufficient, and by communicating wirelessly with the driver's cab remote from the underfloor equipment, wiring to the underfloor equipment is not required and line savings can be achieved. In addition, noise insulation can be improved by the wireless insulation function, and the degree of freedom in arranging equipment under the floor can be improved.

FIG. 13 shows another example of the driving device 16 in consideration of the reduction in the number of wires inside the underfloor equipment and the degree of freedom in the arrangement of electrical components. The same parts as those in FIG. 12 are denoted by the same reference numerals.

In FIG. 13, the voltage detector of the feedback capacitor (FC) 108, which is a feedback signal, is replaced with a wireless device built-in voltage detector 111 incorporating an A / D converter and a wireless device. The detected capacitor voltage is communicated to the controller 101.

FIG. 14 shows an example of the configuration of the wireless device built-in voltage detector 111.

The DC voltage obtained by dividing the voltage of the filter capacitor (FC) 108 by the voltage divider 151 is input to the power supply 152. The power supply 152 is a power supply (DC-DC converter) that outputs a constant output voltage even when the input voltage changes, and supplies power to the AZD converter 153 and the radio 154. Also, the output of the voltage divider 151 is converted to a digital signal by the A / D converter 153 and transmitted by the radio 154.

Since the A / D-converted filter capacitor voltage is wirelessly transmitted to the control device 101, not only is insulation between the filter capacitor 108 and the control device 101 unnecessary, but also the conventional This eliminates the need for analog wiring between the FC 108 and the controller 101. For this reason, the detection value of the FC voltage is less affected by noise, and higher control accuracy can be realized.

Filler capacitor voltage is 1 level for 2 levels and 3 levels for 1 —Even in the evening, there are two signals, the upper arm voltage and the lower arm voltage, and the amount of data is small. At present, the processing cycle of voltage control in practical use is about 200; s. To achieve the same response speed, even if a 12-bit A / D converter is used, 200 Communication is possible if the speed is about 0 kbps. However, there are some processes that need to read the voltage data faster, so it is desirable to set the communication speed to 1 Mbps.

Fig. 15 shows, in addition to the operation control device 32 and FC 108, the U, V, and W phase current detection values of the induction motor 103 detected by the wireless device's built-in current detector 112 wirelessly. This is to communicate with the control device 101.

By configuring the drive unit 16 as shown in Fig. 15, the wiring saving and noise resistance of the underfloor equipment are further improved. The configuration of the wireless device built-in current detector 112 may be basically the same as that of the wireless device built-in voltage detector 111, and includes a DC power supply, an A / D converter, and a wireless device. As long as the communication speed can achieve the same response speed as the current control, 1 Mbps, which is the same as the voltage detection, may be used. Industrial applicability

As described above, the railway vehicle information transmission device of the present invention can perform data transmission between vehicles without being affected by noise, and transmit a high-frequency carrier wave using a modulated wave signal modulated by a baseband signal. In addition, the frequency can be limited to the band required for data transmission by bandpass filtering, and communication is possible even when the voltage amplitude is small. Therefore, it is suitable for trains that require high-speed, high-capacity transmission with high accuracy without being affected by noise.

Claims

The scope of the claims

1. A vehicle in which data communication is performed by a network, network control means for controlling data communication in the network, and signal transmission means for generating a modulated wave signal obtained by modulating a carrier signal with the data signal. And a signal connection device provided outside the vehicle and transmitting the modulated wave signal to another connected vehicle.

2.A vehicle in which data communication is performed by a network and a noise generating device is installed under the floor, network control means for controlling data communication in the network, and a carrier signal modulated by the data signal. Signal generating means for generating a modulated wave signal having a frequency higher than the noise frequency generated by the noise generating device, and a signal connection provided outside the connecting portion of the vehicle for transmitting the modulated wave signal to another connected vehicle; An information transmission device for a railway vehicle, comprising:

3.A vehicle in which data communication is performed by a network and a noise generating device is installed under the floor, network control means for controlling data communication in the network, and a carrier signal modulated by a baseband signal of the data. A signal transmitting means for generating a modulated wave signal having a frequency higher than a noise frequency generated by the noise generating device; and a signal transmitting means provided outside a connecting portion of the vehicle for transmitting the modulated wave signal to another connected vehicle. An information transmission device for a railway vehicle, comprising: a signal connection device surrounded by a shield material.

4.A vehicle in which data communication is performed by a network, and a noise generating device is installed under the floor, network control means for controlling data communication in the network, and a carrier signal that is a baseband signal of the data. A signal transmission means for generating a modulated wave signal having a frequency higher than a noise frequency generated by the noise generating device; and a signal transmission means provided outside a connecting portion of the vehicle and connected to the other vehicle connected with the modulated wave signal. A signal connection device electrically connected to the signal connection device; an insulating device provided between the signal transmission means and the signal connection device for interrupting direct current An information transmission device for a railway vehicle, comprising: a step;

5. The network communicates overnight, and a vehicle having a noise generating device installed under the floor, network control means for controlling data communication in the network, and a carrier signal based on the data base. Signal transmission means having modulation means for generating a modulated wave signal modulated by a band signal, and demodulation means for transmitting data obtained by demodulating a modulated wave signal transmitted from another connected vehicle to the network; and And a signal connection device for transmitting the modulated wave signal to another vehicle to which the modulated wave signal is connected.

6.A network including vehicle control information and service information is transmitted overnight, and a vehicle in which noise generating equipment is installed under the floor, network control means for controlling data communication in the network, and carrier waves. A signal transmitting means for modulating a signal with the baseband signal of the night and generating a modulated wave signal having a frequency higher than a noise frequency generated by the noise generating device; and A signal connection device electrically connected by a plurality of connectors to a signal connection device of another vehicle to which the modulated wave signal is connected; and an insulation provided between the signal transmission means and the signal connection device for blocking direct current. And an information transmission device for a railway vehicle.

7. Network broadband communication including vehicle control information and service information is performed via the network, and a network control means for controlling data communication in the network with a vehicle in which noise generating equipment is installed under the floor. A signal transmitting means for modulating a carrier signal with the data signal to generate a modulated wave signal having a frequency higher than a noise frequency generated by the noise generating device; and A signal connection device for transmitting a wave signal to another connected vehicle.

8. Data communication is performed by a network, and a vehicle that has noise generating equipment installed under the floor is connected to a network that controls data communication in the network. Network control means, a radio transmission means for modulating a carrier wave signal with a baseband signal of the data, and generating a modulated wave signal having a frequency higher than a noise frequency generated by the noise generating device, and a radio transmission means provided outside a connecting portion of the vehicle. And a signal connection device for wirelessly transmitting the modulated wave signal to a signal connection device of another vehicle to which the modulated wave signal is connected by an antenna.

9. Broadband communication of data including vehicle control information and service information is performed by the network, and a vehicle in which a noise generating device is installed under the floor; network control means for controlling data communication in the network; Wireless transmission means for modulating a carrier signal with the data signal to generate a modulated signal having a frequency higher than a noise frequency generated by the noise generating device; and And a signal connection device in which the antenna is wirelessly transmitted by a plurality of antennas to a signal connection device of another vehicle connected with the signal connection device, wherein the signal connection device is surrounded by a shield material.