The CAN bus network was designed to combine (or multiplex) those messages, thereby reducing the amount of electrical wiring (and weight) required. Invented by Bosch and first used on the Mercedes-Benz S-Class in 1991, the CAN bus initially linked five engine control units (ECUs) in an effort to improve performance and safety by enabling the faster flow of real-time data around the car. In effect, it’s a car’s central nervous system. It’s the electronic communications system that allows different parts of the vehicle to talk to each other, including the engine, the transmission and the brakes. These days, all modern vehicles, from conventional combustion-powered cars to the latest EVs, feature a Controller Area Network (CAN) bus. Tom Denton explains how the technology works. That’s why a Controller Area Network was invented. Vehicles are complex machines with a huge number of components that need to communicate with each other.
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