A comparison of the communication impact in CAN and TTP/C networks when supporting steer-by-wire systems

Distributed real time system is a technology that is become widely used in diverse areas of application, including systems in vehicles, aircraft, locomotives, among others. Great part of these applications is considered critic. Hereupon, such systems must be predictable in relation to its logical result and its temporal behavior, same in operating under failure having to provide tolerances. Distributed real time system requires the use of deterministic and reliable communications mechanisms. A high trend in the automotive area is the replacing of great part of the mechanical and/or hydraulic systems for electronic systems, so called control-by-wire. To reach the objectives of the control-by-wire systems, it is necessary the use of distributed real time systems with fault tolerant properties. This work presents a study about the communication requirements in x-by-wire systems. A theoretic content and a detailed study of temporal property of the CAN and TTP/C network communication are presented in the environment of simulation of the x-by-wire system.