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Signals in Automotive Communication Networks often represent safety relevant information. Therefore, automotive network protocols provide multiple powerful mechanisms for error detection and for error reporting. The objective is to ensure that on average less than one undetected error occurs during the lifetime of a vehicle. This places an upper bound on the residual error probability of the communication network. The determination of this residual error probability requires new methods in order to account for the interaction of the various error detection mechanisms. This paper presents an analysis method that has been developed for the investigation of the CAN protocol. This comprehensive investigation distinguishes two types of errors that contribute most significantly to the residual error probability of the CAN protocol. Errors of one type transform stuffbits into information bits or vice versa, and are related to the use of variable bit stuffing.

A significant portion of communication in Automotive Networks consists of signals, which are vital to the safety of the vehicle. In addition to requirements resulting from the actual transfer of information an Automotive Communication Protocol has to incorporate properties which ensure operational safety even in presence of errors. Based upon a discrimination into reversible errors and irreversible failures, defect nodes have to be determined and subsequently disconnected from the network. In this paper proper schemes for error detection, report, recovery and confinement are presented.