Description / Abstract:
Overview
This text is an introductory overview of vehicle multiplexing.
The intended audience is engineers and managers working in the
field of automotive and other vehicular electronics. The content
for this book was developed from a three-day class on in-vehicle
networking that has been taught in the public sector since 1993. A
series of classes covering this material, and much more, are
available now through Dearborn Group Technology, Inc.
(www.dgtech.com).
Multiplexing, or in-vehicle networking, is one of the most
popular areas of vehicle electronics currently. All vehicle
original equipment manufacturers (OEMs), electronic control unit
(ECU) suppliers, and integrated circuit (IC) vendors to the
automotive industry are working on multiplex products. Multiplexing
is the technology of applying serial data communications to the
electric/electronic functions of a vehicle.
Multiplexing can be best discussed at three levels: the vehicle
level, the ECU or component level, and the IC level. Within each
level are partitions for software and hardware, and within each
partition are divisions of functionality such as buffer size.
The following chapters will help the reader to acquire a basic
understanding of vehicle multiplexing systems primarily from the
viewpoint of the passenger car and light truck. Some discussion of
heavy-duty and off-road vehicle multiplexing will be presented, as
will be a look at industrial automation—a fastgrowing multiplex
field already eclipsing automotive usage. Hereafter, "automotive"
will be used interchangeably with "vehicle."
Hardware and software issues will be presented for the more
common protocols available. This survey should enable the reader to
understand how multiplexing is generally done, so new protocols
should present no difficulty as they arise. Much like software
languages, all multiplex protocols have many things in common, and
new schemes are simple to learn, once one or more are mastered.
Although this is an introductory and background text,
information is presented on important technical issues such as
electromagnetic compatibility (EMC). Within this realm, problems
with electrostatic discharge (ESD), radiated emissions, and
radiated immunity are important topics.
It is assumed that the reader has education and/or experience in
electrical engineering. Some background in microcomputer operation
and programming is also helpful. Basic techniques of
binary/hexadecimal data conversion and computer architectures will
not be presented.