Electronic Control Unit

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Electronic Control Unit

Also known as a node, an Electronic Control Unit is a device, such as a sensor or actuator, that is connected to other devices via a CAN Bus. A vehicle can contain dozens of ECUs for functions such as mirror adjustment, window power, airbags, cruise control, entertainment, and, most significantly, engine control. To form a CAN, two or more ECUs are needed.

Source:

http://www.aeris.com/iot-dictionary/

References:

https://en.wikipedia.org/wiki/Electronic_control_unit