| 摘要 |
<p>A data transmission system for a vehicle includes a plurality of control systems (1-5) installed on the vehicle, and a network bus (6) connecting the plurality of control systems (1-5) with each other for circulating a transmission right through the plurality of control systems (1-5) to thereby perform transmission of a message between the plurality of control systems (1-5). According to a first aspect, each of the control systems (1-5) starts transmitting data when it is detected that the transmission right is not generated or lost from the system, and continues transmitting the data when no collision of data transmitted from the present control system with data transmitted from the rest of the plurality of control systems (1-5), or when by mediation for avoiding the collision is detected, it is determined to continue data transmission. According to a second aspect, the maximum number of times of retransmission to be permitted is determined according to a type of failure in transmission identified, and the retransmission is performed so long as the number times of retransmission of the data does not exceed the maximum number of times of retransmission to be permitted. According to a fourth aspect, the message comprises a first response field for receiving a first acknowledging response output from a control system (1-5) having received the transmission right, and a second response field for receiving a second acknowledging response output from a control system (1-5) having received data. <IMAGE></p> |
