JP2009095092A - Power system for rolling stock car - Google Patents

Power system for rolling stock car Download PDF

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JP2009095092A
JP2009095092A JP2007261265A JP2007261265A JP2009095092A JP 2009095092 A JP2009095092 A JP 2009095092A JP 2007261265 A JP2007261265 A JP 2007261265A JP 2007261265 A JP2007261265 A JP 2007261265A JP 2009095092 A JP2009095092 A JP 2009095092A
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power supply
information
vehicle
power
supply system
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JP5072521B2 (en
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Tomoaki Ishikawa
倫章 石川
Hiroaki Otani
浩昭 尾谷
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Toshiba Corp
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Toshiba Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power system for an electric rolling stock car, in which information exchange environment such as internet, etc. is arranged within the rolling stock car, without performing a large addition to the present facility within the rolling stock car. <P>SOLUTION: This power system for rolling stock car, has a car power unit 2 for supplying a car with auxiliary power, a power socket 8 which is connected to a load circuit, and a car information controller 6, and is so constituted as to transmit information, using a signal transmission line 7 between the vehicle information controller and the car power unit, and a power output line 10 which supplies the load circuit with power, and to perform information transmission service for passengers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、鉄道車両用電源装置にインターネット情報を伝送する機能を備えさせた鉄道車両用電源システムに関する。   The present invention relates to a railway vehicle power supply system in which a railway vehicle power supply apparatus has a function of transmitting Internet information.

電気車両には、車両内の空調、照明などに電源を供給するために、架線からパンタグラフを経緯して電力を取り入れ、電源をつくるための電源装置が搭載されている。近年では乗客へのサービス向上の一環として、乗車中にパソコンが使用できるようにパソコン用の電源コンセントを設ける車両も製作されるようになってきた。将来的には、鉄道車両内でのインターネット環境の整備など、一般家庭内、地上の公共の場と同様に環境を整えていくものと考えられる。ところが、現在までのところ、鉄道車両用電源装置にインターネット情報を伝送する機能を備えさせた鉄道車両用電源システムは見られていない。   In order to supply power to the air conditioner, lighting, etc. in the vehicle, an electric vehicle is equipped with a power supply device for taking in power from an overhead line through a pantograph and creating a power source. In recent years, as part of improving service to passengers, vehicles that have a power outlet for a personal computer so that the personal computer can be used while riding have been manufactured. In the future, it is thought that the environment will be prepared in the same way as in public homes on the ground, such as the maintenance of the Internet environment in railway vehicles. However, to date, no railway vehicle power supply system has been found in which a railway vehicle power supply device is provided with a function of transmitting Internet information.

本発明は、上述した従来の技術的課題に鑑みてなされたもので、鉄道車両内の現在の設備に大幅な追加を行うことなく、車内でのインターネットなどの情報環境を整えることができる鉄道車両用電源システムを提供することを目的とする。   The present invention has been made in view of the above-described conventional technical problems, and a railway vehicle capable of preparing an information environment such as the Internet in the vehicle without significantly adding to the current facilities in the railway vehicle. The purpose is to provide a power supply system.

本発明は、車両の各種機器に電源を供給するための車両用電源装置と、車両の補助電源を供給するための車両用電源装置と、前記車両用電源装置の電源出力線に接続された電源コンセントと、車両情報制御装置と、前記車両情報制御装置と車両用電源装置との間の信号伝送線と、前記信号伝送線と電源出力線を使用して前記車両情報制御装置と前記電源コンセントに接続された情報機器との間で情報伝送を行う情報付加回路とを備えた鉄道車両用電源システムを特徴とする。   The present invention relates to a vehicle power supply device for supplying power to various devices of the vehicle, a vehicle power supply device for supplying auxiliary power to the vehicle, and a power supply connected to a power output line of the vehicle power supply device. An outlet, a vehicle information control device, a signal transmission line between the vehicle information control device and the vehicle power supply device, and the vehicle information control device and the power outlet using the signal transmission line and the power output line. A railway vehicle power supply system including an information addition circuit for transmitting information to and from a connected information device is characterized.

本発明の鉄道車両用電源システムによれば、車両内の電源コンセントに接続された通信端末と車両情報制御装置との間で伝送線及び電源出力線を通じて情報交換ができ、乗客に対して高速通信ができるインターネット接続の便宜を提供できる。   According to the railway vehicle power supply system of the present invention, information can be exchanged between the communication terminal connected to the power outlet in the vehicle and the vehicle information control device through the transmission line and the power output line, and high-speed communication to the passengers. Internet connection can be provided.

以下、本発明の実施の形態を図に基づいて詳説する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（第１の実施の形態）図１を用いて本発明の第１の実施の形態の鉄道車両用電源システムについて説明する。本実施の形態の鉄道車両用電源システムは、架線から電力を取得するためのパンタグラフ１、車両用電源装置（ＳＩＶ）２、車両情報制御装置６、電源コンセント８で構成されている。車両情報制御装置６は、地上局９と接続される。   (First Embodiment) A railway vehicle power supply system according to a first embodiment of the present invention will be described with reference to FIG. The power supply system for a railway vehicle according to the present embodiment includes a pantograph 1 for acquiring power from an overhead line, a vehicle power supply device (SIV) 2, a vehicle information control device 6, and a power outlet 8. The vehicle information control device 6 is connected to the ground station 9.

車両用電源装置２の内部には、パンタグラフ１で取得した架線電力を補助電源電力（ＳＩＶ）に変換するＳＩＶ変換回路３、このＳＩＶ変換回路３のオン／オフ、スイッチング制御を行うＳＩＶ制御回路４を備えている。   Inside the vehicle power supply device 2, there are an SIV conversion circuit 3 that converts the overhead line power acquired by the pantograph 1 into auxiliary power supply power (SIV), an SIV control circuit 4 that performs on / off and switching control of the SIV conversion circuit 3. It has.

本実施の形態の鉄道車両用電源システムでは、従来から設置されている車両情報制御装置６と車両用電源装置２内のＳＩＶ制御回路４との間の伝送線７を利用し、この伝送線７にインターネット情報を重畳させ、車両用電源装置２の中で電源出力線１０に対して情報付加回路５によって信号を重畳させるようにしている。これにより、車内の電流検出コンセント８に接続した電力線通信によりパソコンに情報を伝える。この回路により、従来から備えられている伝送線７と電源出力線１０を活用してインターネットなどの情報信号を伝送する。   In the railway vehicle power supply system according to the present embodiment, a transmission line 7 between the vehicle information control device 6 and the SIV control circuit 4 in the vehicle power supply device 2 that have been installed conventionally is used. The Internet information is superimposed on the power output device 10 so that the signal is superimposed on the power output line 10 in the vehicle power supply device 2. Thereby, information is transmitted to the personal computer by power line communication connected to the current detection outlet 8 in the vehicle. By this circuit, an information signal such as the Internet is transmitted by utilizing the transmission line 7 and the power output line 10 which are conventionally provided.

上記実施の形態の鉄道車両用電源システムでは、伝送線７は車両用電源装置２の状態信号や故障時の記録信号、保守のための情報などを通信している。近年の車両には、このような情報伝送は通常の機能として準備されている。この伝送線７に、車両情報制御装置６により地上局９から得られた情報を重畳させ、車両用電源装置２に送信する。車両用電源装置２の電源出力線１０はすべての車両に配線されている。各車両には、パソコン用の電源コンセント８が準備されている。車両用電源装置２の中で、情報付加回路５により電源出力線１０に信号を重畳させることにより、既設の電源コンセント８にパソコンを接続することでインターネットなどの情報交換が可能になる。   In the railway vehicle power supply system of the above-described embodiment, the transmission line 7 communicates a status signal of the vehicle power supply device 2, a recording signal at the time of failure, information for maintenance, and the like. In recent vehicles, such information transmission is prepared as a normal function. The information obtained from the ground station 9 by the vehicle information control device 6 is superimposed on the transmission line 7 and transmitted to the vehicle power supply device 2. The power output line 10 of the vehicle power supply device 2 is wired to all vehicles. Each vehicle is provided with a power outlet 8 for a personal computer. By superimposing a signal on the power supply output line 10 by the information adding circuit 5 in the vehicle power supply device 2, it is possible to exchange information such as the Internet by connecting a personal computer to the existing power outlet 8.

これにより、本実施の形態の鉄道車両用電源システムでは、新たに配線などを追加せずに鉄道車両の各車両内にインターネット接続環境を整えることができる。   Thereby, in the railway vehicle power supply system of the present embodiment, it is possible to prepare an Internet connection environment in each vehicle of the railway vehicle without newly adding wiring or the like.

（第２の実施の形態）図２を用いて、本発明の第２の実施の形態の鉄道車両用電源システムについて説明する。本実施の形態の鉄道車両用電源システムは、もともとは車両情報制御装置を持たない車両に対してインターネットなどの情報交換環境を整えることを特徴とし、車両用電源装置（ＳＩＶ）２、地上局９、電源コンセント８で構成される。   (Second Embodiment) A railway vehicle power supply system according to a second embodiment of the present invention will be described with reference to FIG. The railway vehicle power supply system according to the present embodiment is characterized in that an information exchange environment such as the Internet is prepared for a vehicle that does not have a vehicle information control device originally, and includes a vehicle power supply device (SIV) 2 and a ground station 9. The power outlet 8 is configured.

車両用電源装置２の中に、地上局９との間で通信できる情報伝送端末６Ａを追設している。車両用電源装置２の中に追設された情報伝送端末６Ａからの信号は、情報付加回路５によって車両用電源装置２の電源出力線１０に重畳される。これにより、車内の電源コンセント９に接続したパソコンに情報を伝えることができる。   An information transmission terminal 6 </ b> A that can communicate with the ground station 9 is additionally provided in the vehicle power supply device 2. A signal from the information transmission terminal 6 </ b> A additionally installed in the vehicle power supply device 2 is superimposed on the power output line 10 of the vehicle power supply device 2 by the information addition circuit 5. Thereby, information can be transmitted to the personal computer connected to the power outlet 9 in the vehicle.

本実施の形態によれば、もともとは車両情報制御装置が設置されていない車両にあっても新たに配線を追加することなく、電源出力線１０を活用してインターネットなどの情報信号を伝送するインターネット接続環境を提供することができる。   According to the present embodiment, the Internet that transmits information signals such as the Internet using the power output line 10 without newly adding wiring even in a vehicle that is not originally installed with a vehicle information control device. A connection environment can be provided.

（第３の実施の形態）本発明の第３の実施の形態の鉄道車両用電源システムについて、図３を用いて説明する。本実施の形態の鉄道車両用電源システムは、図１に示した第１の実施の形態の鉄道車両用電源システムに対して、車両用電源装置２の電源出力線１０に、情報伝送の搬送周波数の信号がＳＩＶ変換回路３で発生するスイッチングノイズの影響を受けないように情報伝送の搬送周波数成分を低減させるためのノイズフィルタ１１を電源出力線の情報付加装置５の前段に挿入したことを特徴とする。挿入するノイズフィルタ１１は、インターネットなどの高速デジタル伝送の搬送周波数成分のみをカットする目的で小形のものが使用できる。尚、図３において、図１と共通する構成要素については共通の符号を付して示してある。   (Third Embodiment) A railway vehicle power supply system according to a third embodiment of the present invention will be described with reference to FIG. The railway vehicle power supply system of the present embodiment is different from the railway vehicle power supply system of the first embodiment shown in FIG. The noise filter 11 for reducing the carrier frequency component of the information transmission is inserted before the information adding device 5 of the power supply output line so that the above signal is not affected by the switching noise generated in the SIV conversion circuit 3. And The noise filter 11 to be inserted can be a small one for the purpose of cutting only the carrier frequency component of high-speed digital transmission such as the Internet. In FIG. 3, components common to those in FIG. 1 are denoted by common reference numerals.

本実施の形態によれば、ノイズ低減用のノイズフィルタ１１を挿入したことにより、車両用電源装置２の電源出力線１０に重畳させる情報信号の通信品質が向上する。   According to the present embodiment, by inserting the noise filter 11 for noise reduction, the communication quality of the information signal to be superimposed on the power output line 10 of the vehicle power supply device 2 is improved.

（第４の実施の形態）本発明の第４の実施の形態の鉄道車両用電源システムについて、図４を用いて説明する。本実施の形態の鉄道車両用電源システムは、インターネットなどの回線情報を車内で利用する乗客へアナウンスするために、図１に示した第１の実施の形態の鉄道車両用電源システムに対して、車内に設置されている車内表示装置１２を設置し、この車内表示装置１２を用いて車両情報制御装置６からインターネットの回線利用情報、通信情報を表示し、車内で利用しようとしている乗客に対する情報提供を行うようにしたことを特徴とする。尚、図４において、図１と共通する構成要素については共通の符号を付して示してある。   (Fourth Embodiment) A railway vehicle power supply system according to a fourth embodiment of the present invention will be described with reference to FIG. The railway vehicle power supply system according to the present embodiment is used for the railway vehicle power supply system of the first embodiment shown in FIG. The in-vehicle display device 12 installed in the vehicle is installed, and the Internet information and communication information is displayed from the vehicle information control device 6 by using the in-vehicle display device 12 to provide information to passengers who are going to use the vehicle. It is characterized by having performed. In FIG. 4, components common to those in FIG. 1 are denoted by common reference numerals.

鉄道車両などの移動体の中でのインターネットなどの情報交換の通信環境では、回線数の制限やトンネルの影響など、通信状態の変化が発生することが予想される。そこで、本実施の形態のように、これらの通信状態の変化を利用客に対して適時情報提供していくことで、乗客に対して利用しやすい状態を作ることができる。また、車両内で専用にＴＶ情報や映画を送信することも考えられるが、これらのチャンネル情報を車内表示装置１２を使用して提供することができる。   In a communication environment for exchanging information such as the Internet in a moving body such as a railway vehicle, it is expected that a change in the communication state will occur, such as a limitation on the number of lines and the influence of a tunnel. Therefore, as in the present embodiment, it is possible to create a state that can be easily used by passengers by providing information on changes in the communication state to the users in a timely manner. Although it is conceivable to transmit TV information and movies exclusively in the vehicle, these channel information can be provided using the in-vehicle display device 12.

（第５の実施の形態）本発明の第５の実施の形態の鉄道車両用電源システムについて、図５を用いて説明する。本実施の形態の鉄道車両用電源システムは、車両用電源装置２の内部で故障が発生した時に故障の範囲を判定して、情報通信系統に故障が発生していない時にはインターネットなどの情報交換環境は稼働を続けるようにしたことを特徴とする。すなわち、図５に示すように、本実施の形態の鉄道車両用電源システムでは、車両用電源装置２の内部に故障が発生した場合には、ＳＩＶ制御回路４の中の故障検出判別回路４Ａが故障を検出し、故障時のシーケンス制御を行う。また、故障検出判別回路４Ａで車両用電源装置２の内部の故障箇所を判別する。また、故障発生時には、ＳＩＶ変換回路３と電源出力線１０との間の接続を切断するための接触器１３が電源出力線１０上に設置されている。この接触器１３はＳＩＶ制御回路４からの信号で接続／開放状態が制御される。尚、図５において、図１と共通するその他の構成要素については共通の符号を付して示してある。   (Fifth Embodiment) A railway vehicle power supply system according to a fifth embodiment of the present invention will be described with reference to FIG. The railway vehicle power supply system according to the present embodiment determines a failure range when a failure occurs in the vehicle power supply device 2 and when the failure occurs in the information communication system, an information exchange environment such as the Internet. Is characterized by continued operation. That is, as shown in FIG. 5, in the railway vehicle power supply system of the present embodiment, when a failure occurs in the vehicle power supply device 2, the failure detection determination circuit 4A in the SIV control circuit 4 Detects a failure and performs sequence control at the time of failure. Further, the failure detection discrimination circuit 4A discriminates a fault location inside the vehicle power supply device 2. In addition, when a failure occurs, a contactor 13 for disconnecting the connection between the SIV conversion circuit 3 and the power output line 10 is installed on the power output line 10. The contactor 13 is controlled to be connected / released by a signal from the SIV control circuit 4. In FIG. 5, the other components common to FIG. 1 are denoted by the same reference numerals.

車両用電源装置２の内部に故障が発生する場合がある。特に電力変換部であるＳＩＶ変換回路３は比較的故障率が高い。このような故障が発生した場合、車両用電源装置２は停止させ、電源出力線１０に対して他の電源装置から電源誘導を行い、車両としての電源の機能を損なわないようにしているのが一般である。しかしながら、そのままであるとインターネットなどの情報交換機能も同様に稼働を停止させてしまうことになる。そこで、本実施の形態の鉄道車両用電源システムでは、故障の検出をＳＩＶ制御回路４の中の故障検出判別回路４Ａで行う。故障検出判別回路４Ａでは、故障が発生した時にその故障の種類により車両用電源装置２の中の大きな構成ブロックの中でどの部分が故障しているかを判別することが可能である。そして、故障検出判別回路４Ａは、故障発生時にその故障部分がインターネットなどの情報交換機能部以外と判断した場合には、車両用電源装置２の中のＳＩＶ変換回路３の部分は稼働を停止させるが、インターネットなどの情報交換機能の部分はそのまま稼働を続けるようにする。また、故障しているＳＩＶ変換回路３と信号重畳部が干渉することを防ぐために、ＳＩＶ制御回路４からの信号で接触器１３を開放する。   A failure may occur inside the vehicle power supply device 2. In particular, the SIV conversion circuit 3 that is a power conversion unit has a relatively high failure rate. When such a failure occurs, the power supply device 2 for the vehicle is stopped, and power supply guidance is performed from another power supply device to the power output line 10 so as not to impair the function of the power supply as the vehicle. It is common. However, if it is left as it is, the information exchange function such as the Internet will stop operating as well. Therefore, in the railway vehicle power supply system of the present embodiment, failure detection is performed by the failure detection determination circuit 4A in the SIV control circuit 4. In the failure detection determination circuit 4A, when a failure occurs, it is possible to determine which portion of the large structural block in the vehicle power supply device 2 is broken depending on the type of the failure. When the failure detection determination circuit 4A determines that the failure portion is other than an information exchange function unit such as the Internet when a failure occurs, the portion of the SIV conversion circuit 3 in the vehicle power supply device 2 stops operating. However, the information exchange function part such as the Internet will continue to operate as it is. In addition, the contactor 13 is opened by a signal from the SIV control circuit 4 in order to prevent interference between the failed SIV conversion circuit 3 and the signal superimposing unit.

本実施の形態の鉄道車両用電源システムによれば、このような構成とすることにより、車両用電源装置２の内部に故障が発生した場合でも、インターネットなどの情報交換環境を損なうことなく稼働でき、車内の情報交換環境の信頼性が向上する。   According to the railway vehicle power supply system of the present embodiment, such a configuration enables operation without impairing the information exchange environment such as the Internet even when a failure occurs in the vehicle power supply device 2. , The reliability of the information exchange environment in the car is improved.

本発明の第１の実施の形態の鉄道車両用電源システムのブロック図。1 is a block diagram of a railway vehicle power supply system according to a first embodiment of the present invention. 本発明の第２の実施の形態の鉄道車両用電源システムのブロック図。The block diagram of the power supply system for rail vehicles of the 2nd Embodiment of this invention. 本発明の第３の実施の形態の鉄道車両用電源システムのブロック図。The block diagram of the power supply system for rail vehicles of the 3rd Embodiment of this invention. 本発明の第４の実施の形態の鉄道車両用電源システムのブロック図。The block diagram of the power supply system for rail vehicles of the 4th Embodiment of this invention. 本発明の第５の実施の形態の鉄道車両用電源システムのブロック図。The block diagram of the power supply system for rail vehicles of the 5th Embodiment of this invention.

符号の説明Explanation of symbols

１：パンタグラフ
２：車両用電源装置（ＳＩＶ）
３：ＳＩＶ変換回路
４：ＳＩＶ制御回路
４Ａ：故障検出判別回路
５：情報付加回路
６：車両情報制御装置
６Ａ：情報伝送端末
７：伝送回路
８：電源コンセント
９：地上局
１０：電源出力線
１１：ノイズフィルタ
１２：車内表示装置
１３：接触器 1: Pantograph 2: Vehicle power supply (SIV)
3: SIV conversion circuit 4: SIV control circuit 4A: Fault detection determination circuit 5: Information addition circuit 6: Vehicle information control device 6A: Information transmission terminal 7: Transmission circuit 8: Power outlet 9: Ground station 10: Power output line 11 : Noise filter 12: In-car display device 13: Contactor

Claims (5)

車両の各種機器に電源を供給するための車両用電源装置と、
前記車両用電源装置の電源出力線に接続された電源コンセントと、
車両情報制御装置と、
前記車両情報制御装置と車両用電源装置との間の信号伝送線と、
前記信号伝送線と電源出力線を使用して前記車両情報制御装置と前記電源コンセントに接続された情報機器との間で情報伝送を行う情報付加回路とを備えたことを特徴とする鉄道車両用電源システム。 A vehicle power supply device for supplying power to various devices of the vehicle;
A power outlet connected to a power output line of the vehicle power supply device;
A vehicle information control device;
A signal transmission line between the vehicle information control device and the vehicle power supply device;
An information addition circuit for transmitting information between the vehicle information control device and an information device connected to the power outlet using the signal transmission line and a power output line. Power system. 前記車両情報制御装置に代えて情報伝送端末を設置し、前記情報付加回路と接続したことを特徴とする請求項１に記載の鉄道車両用電源システム。   2. The railway vehicle power supply system according to claim 1, wherein an information transmission terminal is installed in place of the vehicle information control device and is connected to the information addition circuit. 前記車両用電源装置から発生するノイズを低減するために、前記電源出力線における前記電源コンセントよりも前段に、ノイズフィルタを備えたことを特徴とする請求項1に記載の鉄道車両用電源システム。   2. The railway vehicle power supply system according to claim 1, wherein a noise filter is provided in front of the power outlet in the power output line in order to reduce noise generated from the vehicle power supply device. 前記電源コンセントを用いた電力線情報通信の通信状態を、乗客に対して情報提供するための情報提供装置を備えたことを特徴とする請求項1に記載の鉄道車両用電源システム。   2. The railway vehicle power supply system according to claim 1, further comprising an information providing device for providing information about a communication state of power line information communication using the power outlet to a passenger. 前記車両用電源装置内の電力変換回路の故障時に、当該電力変換回路を切り離して前記情報付加回路を活かしておくために、前記電力変換回路の出力側に、前記電力変換回路と電源出力線との間を接続し又は開放するための接触器を設置したことを特徴とする請求項1に記載の鉄道車両用電源システム。   When the power conversion circuit in the vehicle power supply device fails, the power conversion circuit and the power output line are connected to the output side of the power conversion circuit in order to separate the power conversion circuit and make use of the information addition circuit. 2. The railway vehicle power supply system according to claim 1, wherein a contactor is provided for connecting or releasing the two.
JP2007261265A 2007-10-04 2007-10-04 Railway vehicle power supply system Active JP5072521B2 (en)

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JP2004282837A (en) * 2003-03-13 2004-10-07 Toyota Motor Corp Power supply unit for vehicle
JP2004336483A (en) * 2003-05-08 2004-11-25 Nippon Soken Inc External equipment, connecting method therefor, and in-vehicle communication system
JP2005176131A (en) * 2003-12-12 2005-06-30 Sumitomo Electric Ind Ltd Communication system in mobile
JP2006197164A (en) * 2005-01-13 2006-07-27 Matsushita Electric Ind Co Ltd Data transmission system
JP2006295479A (en) * 2005-04-08 2006-10-26 Matsushita Electric Ind Co Ltd Power line communications apparatus and power line communication method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004235752A (en) * 2003-01-28 2004-08-19 Hitachi Ltd Inter-train communication equipment, inter-train communication method and fitting method of inter-train communication equipment
JP2004282837A (en) * 2003-03-13 2004-10-07 Toyota Motor Corp Power supply unit for vehicle
JP2004336483A (en) * 2003-05-08 2004-11-25 Nippon Soken Inc External equipment, connecting method therefor, and in-vehicle communication system
JP2005176131A (en) * 2003-12-12 2005-06-30 Sumitomo Electric Ind Ltd Communication system in mobile
JP2006197164A (en) * 2005-01-13 2006-07-27 Matsushita Electric Ind Co Ltd Data transmission system
JP2006295479A (en) * 2005-04-08 2006-10-26 Matsushita Electric Ind Co Ltd Power line communications apparatus and power line communication method

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