On-board network system, communication control procedures in the on-board network system and on-board gateway

摘要

An on-board network system includes a plurality of control devices (131, 132, 134, 135) connected to a bus (121), a detection unit (111) that detects an error that occurs, a measurement unit (114) that includes a Measures a frequency of an error detected by the detection unit (111), and a communication control device (115) which displays a communication speed and a communication data amount of at least one control device from the control devices (131, 132, 134, 135) from a first speed and a first data amount reduces a second speed and a second data amount as the error rate becomes greater than or equal to a first amount. The communication control device reduces the communication speed and the communication data amount so that a first communication time required for data transmission at the first speed in the first data amount is longer than a second communication time required for data transmission at the second speed in the second data amount.