COMMUNICATION NETWORK SYSTEM AND FAULT DIAGNOSTIC METHOD OF NODE SYNCHRONIZATION CORRECTION FUNCTION

摘要

PROBLEM TO BE SOLVED: To continuously performing an appropriate communication by diagnosing whether a fault takes place in the synchronization correction function of each node on a network.

SOLUTION: A fault diagnostic section 125 is attached to the synchronization correction function of each ECU connected as the node on the network. The fault diagnostic section 125 adds a prescribed shift amount to a synchronization correction amount calculated by a correction amount calculation section 122 so as to allow a synchronization correction section 124 to execute synchronization correction on the basis of the synchronization correction amount with the shift amount added thereto. Then it is diagnosed whether a fault takes place in the synchronization correction section (synchronization correction function) 124, according to whether the synchronization correction amount calculated by the correction amount calculation section 122 in a succeeding cycle is a value estimated from the shift amount added in a preceding cycle.

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