Networks in automobiles
Because of these limits one must resort to another type of wiring. In motor vehicles a network is used. This network must meet the following criteria based on its installation in an automobile:
- It must be efficient. It must have ample power reserves in order to also cope with future demands and be easy to expand if necessary.
- It must be fail-safe. Installation in an automobile presents numerous disturbance variables, such as high temperature differences, vibrations and electromagnetic influences.
- Despite these requirements it should be economically priced and be available in sufficient quantity.
For these reasons bus systems such as the CAN bus are used in automobiles. Such bus systems exchange their data with only one logical data line, despite the many different types of information and communication devices. With these bus systems the number of data cables is substantially reduced.
The following example displays the wiring of the AUDI A4 turn signal (blinker), comparing conventional and CAN bus wiring:
