Abstract
Determinant factors of time interval for sending reference message in Time Triggered Controller Area Network, called TTCAN below, was analyzed. A software method for fault diagnosis and tolerance of time master was also proposed and the method was validated in a network of hybrid electric vehicle topology. The results indicate that it does work to monitor local time counter in each potential time master and to compare it with basic cycle to diagnose the fault of current time master and that it does make sense to set multi-potential time masters to get tolerance of current time master’s fault and to guarantee proper operation and reliability of TTCAN system.