The trend for next generation of automotive systems are applications with x-by-wire technology, that bring great benefits to the automotive systems, e.g., increase of comfort by creating new automatic functions, weight and cabling reduction, costs and pollution reduction, increasing flexibility and maintainability. In x-by-wire systems, all mechanical functions are replaced by an electronic system with scnsor(s), ECU (Electronic Control Unit) and actuator(s) elements that arc interconnected by a communication bus.The x-by-wire systems arc functions with dependability requirements and classified as safety-critical control systems, where the design of them needs to consider the use of fault-tolerance technical to support some fault modes. However, some example commercially produced of x-by-wire applications arc: steer-by-wire, brake-by-wire, throttle-by-wire and gear-by-wire.This paper proposes a distributed modular architecture with functions that has tasks and messages requirements for the vehicle. First of all, presents all main function and follow is achieved their main x-by-wire functions e.g. steer-by-wire, brake-by-wire and throttle-by-wire, with definition of fault modes in the distributed architecture. The x-by-wire application domain to achieve fault-tolerance use replication of components to detect a fault domain and applies redundancy to achieve continued service in the presence of faults. We show as example the use of FTT-CAN protocol as a bus communication because it is able to support safety critical systems. This proposes is open to use other safety critical protocols as: FlexRay, TT-CAN, ByteFligth and TTP/C.
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