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Safety critical systems are taking demands on automotive systems where the distributed embedded system needs a communication system with properties of fault tolerant real-time communication. In order to increase reliability of systems with serial communication, a device called bus guardian can be added on physical layer to perform management of schedules and data independently from the communication controller, monitoring timing and sending signals of bus status notifying error occurrences to the host. The goal of this paper is to present and perform a comparative analysis of different strategies of bus guardian used in CAN, TTP/C and Flexray protocols, applied in safety critical system in automobile domain. A comparison was carried out to describe the properties and application for each protocol.

The automotive system domain are in increasing motivation with benefits by using the x-by-wire technologies, which employ new electronic devices to provide for automobile system more facilities during processes at development, production, usability and maintenance. Considering at automobile user domain point of view, the next generation of automobiles can give users more comfort, safety and flexibility. However, for the safety critical applications at automobiles have as requirements the use of distributed embedded systems and fault tolerance methodologies where in communication infrastructure need to offer fault-tolerance communication services. Several researches regards fault tolerance communication systems for automotive domain are now in progress and a strong convergence in use of the Flexray technology is noted for the automotive community. The Flexray is one of the communication systems that had been proposed and available at AUTOSAR standard.

This work presents the architecture solution adopted for the development of a new generation of application-specific engine control modules. The main target of the new technology is a set of small Otto-cycle engines for undergraduate student competitions. The new architecture solution provides high flexibility and very high processing performance for the module. There are three system levels: Calibration Interface, Algorithmic Processing, and Hard-Real-Time Interface. This real-time interface generates the necessary output signals and reads all sensors and system inputs. The processor used at the Algorithmic Processing level is then relieved from this task and the algorithm designer can count with more processing power for the control strategies. The first prototype is implemented with a PC, a fast Digital Signal Processor (DSP) from Analog Devices, and a flexible programmable logic integrated circuit from Xilinx.