JP2004249772A - On-vehicular communication connection apparatus and on-vehicular communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicular communication connection apparatus and an on-vehicular communication system enhancing reliability against operation stopping at unexpected disconnection of power source. <P>SOLUTION: The on-vehicular communication connection apparatus is provided with a first diode D1 connected between an electricity receiving part 26 connected to a battery and a regulator 24 and feeding power from the electricity receiving part 26 to the regulator 24; a second diode D2 connected between the electricity receiving part 26 and a preliminary power source 22 such as an accumulator and feeding the power from the electricity receiving part 26 to the preliminary power source 22; and a third diode D3 connected between the preliminary power source 22 and the regulator 24 and feeding the power from the preliminary power source 22 to the regulator 24. A gate way is operated by the power fed from the regulator 24. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-vehicle communication connection device for connecting a plurality of communication networks in a vehicle and an in-vehicle communication system.
[0002]
[Prior art]
In a vehicle such as an automobile, for example, an OPEN-LAN (Local Area Network) to which devices brought in by a user are connected and an OEM-LAN to which devices related to running control of the vehicle are connected, for example, a gateway or the like. (See, for example, Patent Document 1).
[0003]
FIG. 4 shows a configuration example of a vehicle-mounted communication system. The gateway 2 is connected to the OEM-LAN and the OPEN-LAN, and controls data transfer between the OEM-LAN and the OPEN-LAN. In the example of FIG. 4, a navigation system 32 and an emergency notification device 34 are connected to the OEM-LAN, and an external communication device 36 is connected to the OPEN-LAN.
[0004]
For example, when a notification signal is output from the emergency notification device 34 to the gateway 2 due to the occurrence of an accident or the like, the gateway 2 transfers the notification signal to the external communication device 36. The external communication device 36 transmits the received notification signal to a predetermined service server or the like via a communication line such as the Internet.
[0005]
The gateway 2 is connected to a battery 30 in the vehicle via a power supply line L, and operates by receiving power supply from the battery 30. FIG. 5 shows an example of the arrangement and connection of the battery 30 and the gateway 2. In the example of FIG. 5, the battery 30 is disposed on the front left side of the vehicle, the gateway 2 is disposed on the center left side of the vehicle, and the power supply line L is wired on the left side of the vehicle.
[0006]
[Patent Document 1]
JP 2002-152244 A
[Problems to be solved by the invention]
When an accident or the like occurs, there is a possibility that the connection connector between the battery 30 or the gateway 2 and the power supply line L is disconnected due to an impact, or the power supply line L is disconnected due to a collision on the left side, for example. When the connection between the battery 30 and the gateway 2 is disconnected, the power supply is stopped, and the gateway 2 is also stopped.
[0008]
When the gateway 2 stops, data cannot be transferred between the OEM-LAN and the OPEN-LAN, and the notification signal output from the emergency notification device 34 cannot be sent to the external communication device 36. Even when the emergency notification device 34 and the external communication device 36 are operating, when the gateway 2 is stopped, a notification signal cannot be transmitted from the external communication device 36, and services such as support for accidents are provided. There is a problem that can not be received.
[0009]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an in-vehicle communication connection device that delays operation stoppage when power is unexpectedly turned off and improves reliability.
[0010]
Another object of the present invention is to provide a vehicle-mounted communication system in which the possibility of operation stop is reduced and reliability is improved.
[0011]
[Means for Solving the Problems]
An in-vehicle communication connection device according to a first aspect of the present invention has a power receiving unit to which power is supplied, and includes a standby power supply in the in-vehicle communication connection device that connects a plurality of communication networks in a vehicle, and supplies power to the power reception unit. Is configured to receive power supply from the standby power supply when the power supply stops.
[0012]
According to a second aspect of the invention, in the vehicle-mounted communication connection device according to the first aspect, the backup power supply is a storage battery.
[0013]
The in-vehicle communication connection device according to a third invention is the vehicle-mounted communication connection device according to the second invention, wherein the regulator is connected to the power reception unit and the storage battery, and is connected between the power reception unit and the regulator to transmit power from the power reception unit to the regulator. A first backflow prevention element, a second backflow prevention element connected between the power receiving unit and the storage battery for transmitting power from the power reception unit to the storage battery, and a second backflow prevention element connected between the storage battery and the regulator; And a third backflow preventing element for transmitting power to the regulator, and configured to operate with the power supplied from the regulator.
[0014]
An in-vehicle communication system according to a fourth invention is an in-vehicle communication system in which a plurality of communication networks in a vehicle are connected by an in-vehicle communication connection device supplied with power from the in-vehicle storage battery. Are connected by a power supply line.
[0015]
According to the first aspect, when the standby power supply is provided and the power receiving unit is supplied with power, the vehicle-mounted communication connection device is operated using the power supplied to the power receiving unit, and the power supply to the power receiving unit is stopped. In this case, the in-vehicle communication connection device is operated using the power supplied from the standby power supply. Even when the power supply to the power receiving unit is stopped, the operation of the in-vehicle communication connection device can be maintained for a predetermined time using the backup power supply.
[0016]
In the second invention, normally, power is supplied from the vehicle-mounted storage battery to the vehicle-mounted communication connection device, so that the storage battery is fully charged. When the power supply from the vehicle-mounted storage battery to the vehicle-mounted communication connection device is stopped, the storage battery starts discharging from a fully charged state, so that the performance of the storage battery can be fully utilized.
[0017]
In the third invention, when power is supplied to the power receiving unit, the power received from the power receiving unit to the regulator is supplied by the first backflow prevention element, the in-vehicle communication connection device operates, and The power received from the power receiving unit to the storage battery is supplied by the prevention element, and the storage battery is charged. When the power supply to the power receiving unit is stopped, the power supply from the power receiving unit to the regulator by the first backflow prevention element is stopped. However, the power is supplied from the storage battery to the regulator by the third backflow prevention element, and the vehicle is mounted on the vehicle. The communication connection device continues to operate. Since the connection switching between the regulator and the power receiving unit or the storage battery is not performed by a mechanical switch or the like, the reliability of the connection switching is high.
[0018]
In the fourth invention, the on-vehicle communication connection device and the on-vehicle storage battery are connected by a plurality of power supply lines. Preferably, the plurality of power supply lines are wired at positions separated from each other. For example, when the battery is disposed in front of the vehicle and the in-vehicle communication connection device is disposed in the center of the vehicle, it is preferable to respectively wire a plurality of power supply lines so as to pass through the left side and the right side of the vehicle. . As long as any one of the plurality of power supply lines maintains the connection between the vehicle-mounted communication connection device and the vehicle-mounted storage battery, the vehicle-mounted communication connection device is supplied with power and operates.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments.
(First Embodiment)
FIG. 1 shows a configuration example of an in-vehicle communication system including a gateway (in-vehicle communication connection device) 10 according to the present invention. In this description, the gateway 10 connects the OEM-LAN and the OPEN-LAN. OEM-LAN restricts the devices that can be connected to the vehicle manufacturer, and connection and disconnection of devices other than the vehicle manufacturer are prohibited. The OPEN-LAN allows a user of a vehicle to freely connect and disconnect equipment. In this description, the navigation system 32 and the emergency notification device 34 are connected to the OEM-LAN, and the external communication device 36 is connected to the OPEN-LAN. The gateway 10 performs a data transfer process between the OEM-LAN and the OPEN-LAN. The data transfer processing includes rejecting data transfer in addition to transferring data.
[0020]
Each of the devices 32, 34, 36 and the gateway 10 include a communication unit compliant with, for example, IEEE (Institute of Electrical and Electronic Engineers) 1394, and are connected in a daisy chain. In IEEE 1394, it is possible to transmit an IP (Internet Protocol) packet based on IP over IEEE 1394 defined in RFC (Request For Comments) 2734. The external communication device 36 is capable of performing wireless communication conforming to Dedicated Short Range Communication (DSRC), Bluetooth, IEEE 802.11b, or the like, and is connectable to a communication network outside the vehicle such as the Internet.
[0021]
Each device and the gateway 10 connected to the OEM-LAN and the OPEN-LAN can transmit one or both of an IEEE 1394 packet (hereinafter, 1394 packet) and an IP over IEEE 1394 packet (hereinafter, IP-1394 packet). is there. For example, by the data transfer process of the gateway 10, the IP-1394 packet (IP packet) output from the emergency notification device 34 is transferred to the external communication device 36 and transmitted from the external communication device 36 to a predetermined service server on the Internet. It is possible to do.
[0022]
The gateway 10 is connected to the first communication unit 16 and the second communication unit 18 to which the OEM-LAN and the OPEN-LAN are connected, respectively, and is connected to the first communication unit 16 and the second communication unit 18. A data transfer unit 14 for performing a data transfer process between LANs, a control unit 12 connected to the first communication unit 16, the second communication unit 18, and the data transfer unit 14 for controlling the units 14, 16, 18; A power supply unit 20 connected to the first communication unit 16, the second communication unit 18, the data transfer unit 14, and the control unit 12 (shown by a two-dot chain line in FIG. 1) and supplying power to each of the units 12, 14, 16, 18 Prepare.
[0023]
FIG. 2 shows a configuration example of the power supply unit 20. The power supply unit 20 is connected to a battery (vehicle storage battery) 30 via a power supply line L. The power supply unit 20 includes a power receiving unit 26 to which the power supply line L is connected, a standby power supply 22 such as a storage battery, and the like. , 16 and 18 are provided. The power receiving unit 26 is connected to the regulator 24 via a first diode (backflow prevention element) D1 and to the standby power supply 22 via a second diode D2.
[0024]
The first diode D1 sends power from the power receiving unit 26 to the regulator 24, and the power supplied from the battery 30 is supplied to each unit 12, 14, 16, 18 of the gateway 10 via the regulator 24. The second diode D2 sends power from the power receiving unit 26 to the standby power supply 22, and the power supplied from the battery 30 is charged to the standby power 22.
[0025]
Further, the standby power supply 22 is connected to the regulator 24 via the third diode D3. The third diode D3 can transmit power from the standby power supply 22 to the regulator 24, and supply the power output from the standby power supply 22 to each unit 12, 14, 16, 18 of the gateway 10 via the regulator 24. . However, when the voltage supplied from the battery 30 is V [V], the voltage supplied to the regulator 24 is V '≒ V [V], the output voltage of the standby power supply 22 is V' ≒ V [V], Normally, power is not supplied from the standby power supply 22 to the regulator 24 via the third diode D3.
[0026]
As the standby power supply 22, any chargeable and dischargeable storage battery can be used, and for example, a lead storage battery or a lithium ion battery can be used. Further, it is also possible to use an electric double layer capacitor or the like as the standby power supply 22. The backup power supply 22 preferably has an overcharge prevention function.
[0027]
Next, the operation of the power supply unit 20 of the gateway 10 when the power supply line L is disconnected due to a vehicle collision or the like will be described.
When the power supply line L is disconnected, the voltage supplied from the battery 30 decreases from V [V] to 0 [V] (ground level), and the voltage supplied to the regulator 24 via the first diode D1. Also decrease. However, the output voltage of the standby power supply 22 is V ′ [V], power is supplied from the third diode D3 to the regulator 24, and the voltage supplied to the regulator 24 is maintained at V ′ [V].
[0028]
Even if power is no longer supplied from the battery 30, power is supplied from the standby power supply 22 to the regulator 24, and the units 12, 14, 16, and 18 of the gateway 10 operate normally. For example, even if the power supply line L is disconnected, the notification signal output from the emergency notification device 34 can be transferred to the external communication device 36.
[0029]
(Second embodiment)
FIG. 3 shows a connection example of a gateway and a battery in the in-vehicle communication system according to the present invention. In FIG. 3, the battery 30 is disposed on the left front side of the vehicle, and the gateway 2 is disposed on the left side of the center of the vehicle. The battery 30 and the gateway 2 are connected by a power supply line L1 wired on the left side of the vehicle and a power supply line L2 wired on the right side of the vehicle.
[0030]
Even if a collision occurs on the left side of the vehicle and the power supply line L1 is cut off, power supply from the battery 30 to the gateway 2 is maintained by the right side power supply line L2.
[0031]
Of course, it is also possible to combine the first embodiment and the second embodiment described above. For example, the gateway 10 described in the first embodiment (FIG. 1) can be used in the in-vehicle communication system described in the second embodiment (FIG. 3).
[0032]
【The invention's effect】
According to the first, second or third aspect of the present invention, by providing a backup power supply such as a storage battery, the vehicle-mounted communication connection device can be operated by the backup power supply for a predetermined time even when power supply from the battery is stopped. Becomes possible. It is possible to delay the stoppage of operation at the time of unexpected power-off, and to improve reliability.
[0033]
According to the fourth invention, by connecting the vehicle-mounted communication connection device and the vehicle-mounted storage battery with the plurality of power supply lines, as long as any of the plurality of power supply lines maintains the connection between the vehicle-mounted communication connection device and the vehicle-mounted storage battery, Then, the vehicle-mounted communication connection device operates. It is possible to reduce the possibility that power supply to the in-vehicle communication connection device is stopped and to improve reliability.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of an in-vehicle communication system including a gateway (an in-vehicle communication connection device) according to the present invention.
FIG. 2 is a block diagram illustrating a configuration example of a power supply unit.
FIG. 3 is a diagram illustrating a connection example of a gateway and a battery.
FIG. 4 is a block diagram illustrating a configuration example of a conventional in-vehicle communication system.
FIG. 5 is a block diagram showing an example of a conventional arrangement and connection of a battery and a gateway.
[Explanation of symbols]
2 Conventional gateway 10 Gateway (in-vehicle communication connection device)
Reference Signs List 20 power supply unit 22 standby power supply 24 regulator 30 battery (vehicle storage battery)
D1 1st diode (1st backflow prevention element)
D2 2nd diode (2nd backflow prevention element)
D3 Third diode (third backflow prevention element)
L, L1, L2 power supply line

Claims (4)

An in-vehicle communication connection device having a power receiving unit to which power is supplied and connecting a plurality of communication networks in the vehicle,
An in-vehicle communication connection device, comprising: a standby power supply, configured to receive power supply from the standby power supply when power supply to the power receiving unit is stopped. The in-vehicle communication connection device according to claim 1, wherein the standby power supply is a storage battery. A regulator connected to the power receiving unit and the storage battery;
A first backflow prevention element that is connected between the power receiving unit and the regulator and sends power from the power receiving unit to the regulator;
A second backflow prevention element that is connected between the power receiving unit and the storage battery and sends power from the power receiving unit to the storage battery;
A third anti-reflux element connected between the storage battery and the regulator and configured to transmit power from the storage battery to the regulator, and configured to operate with the power supplied from the regulator. Item 4. An in-vehicle communication connection device according to item 2. In an in-vehicle communication system in which a plurality of communication networks in a vehicle are connected by an in-vehicle communication connection device supplied with power from an in-vehicle storage battery,
The on-vehicle communication system, wherein the on-vehicle communication connection device and the on-vehicle storage battery are connected by a plurality of power supply lines.

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