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|1. (WO2017057165) VEHICLE COMMUNICATION SYSTEM|
|Applicants:||AUTONETWORKS TECHNOLOGIES, LTD.
SUMITOMO WIRING SYSTEMS, LTD.
SUMITOMO ELECTRIC INDUSTRIES, LTD.
|Title:||VEHICLE COMMUNICATION SYSTEM|
Provided is a vehicle communication system which can prevent a communication line from being occupied by a repetitive unauthorized message transmission. This vehicle communication system, in which a plurality of ECUs are connected through a communication line, is provided with a monitoring device having: a determination processing unit which determines whether a message is authorized; a discard processing unit which discards an unauthorized message before the completion of transmission; a storage unit which stores the ID of a discarded message; and a notification processing unit which outputs an ACK signal indicating a reception completion when a message having an ID stored in the storage unit is received. The discard processing unit does not discard any messages with an ID stored in the storage unit. Each ECU stores, in the storage unit, the IDs assigned to messages on which a discard process has been performed by the monitoring device, and prohibits processing on the basis of messages with IDs stored in the storage unit.