Honda Motor Co., Ltd.
Communication system and vehicle

Abstract:

A communication circuit unit of an FI-ECU receives a signal from an AT-ECU. An arithmetic processing unit determines transmitted data at a control cycle .DELTA.Tn, transmits a communication data signal including the transmitted data to the AT-ECU at a time point t2 after the start point of the current control cycle .DELTA.Tn, and retransmits it at a time point t3 where a state, in which an ACK signal from the AT-ECU has not been received, has continued for a predetermined period of time. When the current control cycle .DELTA.Tn is ended in a state in which the ACK signal has not been received, at a time point t5 after the start point of the next control cycle .DELTA.Tn, the arithmetic processing unit transmits the communication data signal including a newest value of the transmitted data determined at the start point of the next control cycle .DELTA.Tn to the AT-ECU.