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.
Highlights
New concepts and application in automotive electrical control systems such as x-by-wire systems require a time triggered communication mechanism in order to guarantee and to improve the real-time performance of the control system
In a TTCAN network, all nodes time counter are synchronized by the reference message sent by time master, and time windows are used to realize that all messaged transmitted on bus are predictable in time[4][5].It is very significant and essential that the current time master works well
It can be concluded that the sending interval of reference message by time master is determined by three factors such as reference message length, bus baud rate and basic cycle length of system matrix
Summary
New concepts and application in automotive electrical control systems such as x-by-wire systems require a time triggered communication mechanism in order to guarantee and to improve the real-time performance of the control system. In a TTCAN network, all nodes time counter are synchronized by the reference message sent by time master, and time windows are used to realize that all messaged transmitted on bus are predictable in time[4][5].It is very significant and essential that the current time master works well. It is necessary to take measures to guarantee transmitting cycle of reference message and to make fault diagnosis and tolerance of time master in TTCAN. The transmitting mechanism of reference message was analyzed and the determinant factors of sending interval of reference message by time master was proposed which includes bus baud rate and reference message length and basic cycle length of system matrix. According to ISO11898-4 and basic principle of fault-tolerance system[6], a software design method for fault diagnosis and tolerance of time master was proposed by setting multi-potential time masters to send its corresponding reference message in pre-defined priority at the time that a fault of current time master is diagnosed so as to keep continuity of reference message and normal operation of the system and to improve the system reliability
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