ON-VEHICLE COMMUNICATION SYSTEM

摘要

An on-vehicle communication system has a plurality of buses relay-connected through a relay connection unit, each of the buses having at least one ECU connected thereto. In the vehicle communication system, a basic routing table that specifies a relay point for transmitting from the relay connection unit to the ECU is stored in a ROM and a transmission list report message about message IDs is transmitted. The ECU receives the transmission list report message and sends back a transmission request message about a message ID, which is not included in the transmission list report message but should be received, to the relay connection unit. The transmission request message is received by a table creation unit in the relay connection unit. The table creation unit creates a new additional routing table indicating a correspondence relationship between an ID requested by the transmission request message and a transmission destination and being stored in a RAM.