VEHICLE-MOUNTED COMMUNICATION SYSTEM

摘要

Transmission timing is so adjusted that messages belonging to the same group are defined as the closest possible transmission timing and messages belonging to different groups are defined as the most distant possible transmission timing. A communication network in which a plurality of terminals are connected to a shared bus is a vehicle-mounted communication system which connects a plurality of ECUs through 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 first group and a plurality of groups of a second group to an Nth group according to the type of message information. Each of the ECUs is provided with a transmission timing computing section for computing the transmission timing for each message group to be transmitted. The transmission timing computing section adjusts so as to bring the transmission timing of messages belonging to the first group transmitted from its own ECU closer to the transmission timing of messages belonging to the first group received from another electronic control unit.