Controller Area Network
On February 25, 1986, Bosch presented the CAN protocol in Detroit (USA) at an SAE conference. Five years later, Mercedes launched the W140 model of its luxury S-class cars implementing five CAN-connectable ECUs (electronic control unit).
Beginning of the 80ties, Bosch started the development of a serial network technology for automotive applications. The results were presented at an SAE conference, in 1986. This was the starting point of a success story. One year later, Intel introduced the i82566 CAN stand-alone controller comprising 30 000 transistors in a 44-pin package with a size of 20 mm².
It was a so-called Full-CAN controller, meaning that it stored received data and remote frames in dedicated buffers, depending on the results of the acceptance filtering. The second CAN stand-alone controller was the 82C200 from Philips. It was a so-called Basic-CAN controller, meaning that it stored received data and remote frames in a FIFO (first-in, first-out) memory.
Five years after CAN was launched, Mercedes exhibited in March 1991 the W140 model (S-class) in Geneva (Switzerland). It was equipped with five ECUs providing CAN interfaces. The German carmaker produced about 430 000 cars of this model. In 1995, BMW also implemented a CAN network in its 750 models. The CAN tree topology connected five ECUs.
Today, nearly all passenger cars use multiple CAN networks connecting 50 to 200 ECUs depending on the vehicle’s features. The installed CAN networks are often linked by means of gateways.
The nonprofit CiA (CAN in Automation) association for users and manufacturers was originally established to support CAN applications in non-automotive markets from elevator control to medical devices. In the beginning, machine embedded control was another important application. Today, the association with about 700 member companies develops the third CAN data link layer generation – also known as CAN XL. It was established in March 1992, just one year after the introduction of the first car with a CAN network.
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