Controller Area Network ( CAN ) EECS 461 , Fall 2008 ∗
نویسندگان
چکیده
Up until now, we’ve considered our embedded control system to be self-contained: an algorithm implemented in software resident on a single microprocessor, communicating with its environment through sensors and actuators via peripheral devices such as an analog-to-digital converter. In fact, many embedded systems are distributed, consisting of multiple microprocessors communicating over one or more networks to accomplish shared tasks. For example, a modern automobile may have seventy or more microprocessors communicating over several networks to manage entertainment and navigation functions, central locking mechanisms, lighting and other vehicle systems. Safety systems such as air bags employ dedicated high speed network communication, as does powertrain control for communication between, for example, the engine and transmission controllers. Figure 1 illustrates some of the networks connecting automotive embedded systems [1, 2]. Although we will consider only wired networks, “wireless” is clearly a crucial technology for everything from assisted living to national defense [4], and wireless networking is a growing area of importance to the twenty-first century automobile. Applications include toll collection, fleet vehicle management, stolen vehicle tracking, automatic collision notification and remote diagnostics. One may expect that the confluence of in-vehicle and external communication technologies will lead to new information, entertainment and safety services such as the in-vehicle display of roadway emergency warnings or even active mitigation of collisions at intersections and vehicle-to-vehicle cooperation for improvement of safety and traffic flow [3].
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