Abstract: In a communication system, an in-vehicle relay device relays data between ECUs, which are each connected to a communication line in a vehicle, by communicating with each of the ECUs. Data received by a communication device from a server outside the vehicle is input to an out-of-vehicle relay device. Data to be transmitted by the communication device to the server is output to the communication device by the out-of-vehicle relay device. The out-of-vehicle relay device relays data between the server and the ECUs by passing data to and from the in-vehicle relay device. The out-of-vehicle relay device outputs, to the in-vehicle relay device, data input to the out-of-vehicle relay device, or associated data that is associated with data that was output. The in-vehicle relay device determines whether the relaying performed by the out-of-vehicle relay device is to be suspended, based on associated data output by the out-of-vehicle relay device.

Abstract: A communication network in which a plurality of terminals are connected to a common bus is a vehicle-mounted communication system which connects a plurality of ECUs though the bus, transmits messages at predetermined communication intervals between the ECUs, and receives the transmitted messages. The messages transmitted/received between the ECUs through a CAN communication line are divided into a plurality of groups such as a first group, a second group to an Nth group according to the type of message information. Each of the ECUs is provided with a transmission timing operation part for computing the transmission timing for each message group to be transmitted. The transmission timing operation part adjusts so as to bring the transmission timing of message belonging to the first group transmitted from its own ECU closer to the transmission timing of message belonging to the first group received from another electronic control unit.

Abstract: A communication network in which a plurality of terminals are connected to a common bus is a vehicle-mounted communication system which connects a plurality of ECUs though the bus, transmits messages at predetermined communication intervals between the ECUs, and receives the transmitted messages. The messages transmitted/received between the ECUs through a CAN communication line are divided into a plurality of groups such as a first group, a second group to an Nth group according to the type of message information. Each of the ECUs is provided with a transmission timing operation part for computing the transmission timing for each message group to be transmitted. The transmission timing operation part adjusts so as to bring the transmission timing of message belonging to the first group transmitted from its own ECU closer to the transmission timing of message belonging to the first group received from another electronic control unit.

Abstract: A vehicle-mounted video communication system is equipped with first to fourth image pickup devices, mounted on a vehicle, for transmitting video data obtained by picking up an image; first to fourth video processing devices for processing the video data; and a vehicle-mounted video relay device having connection sections connected to the first to fourth image pickup devices and the first to fourth video processing devices via communication cables and configured to transmit the video data transmitted from the first to fourth image pickup devices selectively or in a multiplexed state to the first to fourth video processing devices.

Abstract: A on-vehicle database system includes: a memory for recording an on-vehicle database connected to an on-vehicle LAN network and to an ECU for registering data inputted from respective ECU as attribute value data all at once; and data output means for registering data in the on-vehicle database when the data is inputted via I/O means and outputting the data to the ECU at the timing when the data is required by the ECU, by using the attribute value data in the on-vehicle database.

Abstract: A communication network in which a plurality of terminals are connected to a common bus is a vehicle-mounted communication system which connects a plurality of ECUs though the bus, transmits messages at predetermined communication intervals between the ECUs, and receives the transmitted messages. The messages transmitted/received between the ECUs through a CAN communication line are divided into a plurality of groups such as a first group, a second group to an Nth group according to the type of message information. Each of the ECUs is provided with a transmission timing operation part for computing the transmission timing for each message group to be transmitted. The transmission timing operation part adjusts so as to bring the transmission timing of message belonging to the first group transmitted from its own ECU closer to the transmission timing of message belonging to the first group received from another electronic control unit.

Abstract: The present invention provides a vehicle-mounted video communication system being characterized in that the wiring between a plurality of image pickup devices and a plurality of video processing devices can be simplified, the total length of cables can be reduced, and the respective devices can be reduced in size.

Abstract: A on-vehicle database system includes: a memory for recording an on-vehicle database connected to an on-vehicle LAN network and to an ECU for registering data inputted from respective ECU as attribute value data all at once; and data output means for registering data in the on-vehicle database when the data is inputted via I/O means and outputting the data to the ECU at the timing when the data is required by the ECU, by using the attribute value data in the on-vehicle database.

Abstract: This invention relates to a node device which, in the case of a plurality of different types of networks are connected to one another, is able to relay and transmit a packet from a conventional type (e.g., ethernet) LAN to a FDDI LAN. The node device has a MAC sublayer for supporting the conventional LAN and a FDDI MAC sublayer for supporting the FDDI LAN. The FDDI MAC sublayer has a queue provided by a FIFO memory, a transmitting/receiving unit for transmitting, receiving and erasing a packet and a comparator. When a packet issued from a node of the conventional LAN is transmitted to the FDDI LAN via the node device, the queue stores the source address of the packet by a FIFO method. When the transmitting/receiving unit receives a packet, it compares in the comparator the source address of the received packet with the source address read from the queue.