Modern automobiles are a real gathering place for embedded systems. Each new car has between twenty and one hundred embedded controllers, each dedicated to one particular task. There are individual controllers for engine control, dashboard displays, trip computer, keyless entry, electric seat adjustment and position memory, mirror adjustment, power windows, cruise control, and airbag control. Advanced safety features such as ABS (anti-lock breaking system) and ESP (electronic stability program) have their individual embedded systems, as do more advanced features such as automatic headlight switch, rain sensor, parking distance sensors, and so on.
With new features being added to automobiles every day, it is cheaper to add additional embedded controllers than to develop a single monolithic automotive computer system. Also, individual embedded systems can be replaced more easily in case of a defect. However, drawbacks of having many individual controllers in a car are the need to include one or more bus systems for interfacing the controllers. Each controller has to meet the bus specification in order to not disturb the communication of others, as well as to comply with EMC (electromagnetic compatibility) restrictions.
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(2008). Automotive Systems. In: Embedded Robotics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-70534-5_26
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