What is meant by automotive CAN bus?

CAN stands for Controller Area Network (hereinafter referred to as CAN) and is an ISO internationally standardized serial communication protocol. In the automotive industry, a variety of electronic control systems have been developed for the requirements of safety, comfort, convenience, low public health, and low cost. Since the types of data used for communication between these systems and the requirements for reliability vary, there are many cases in which multiple buses are used, and the number of wiring harnesses has increased. In 1986, Bosch, a German electrician, developed the CAN communication protocol for automobiles to meet the needs of "reducing the number of wiring harnesses" and "high-speed communication of large amounts of data over multiple LANs". Since then, CAN has been standardized by ISO11898 and ISO11519, and has become the standard protocol for automotive networks in Europe.

The high performance and reliability of CAN has been recognized and is widely used in industrial automation, ships, medical equipment, industrial equipment, and so on. Fieldbus is one of the hotspots of technological development in the field of automation today, and is known as the computer LAN in the field of automation. Its appearance provides strong technical support for distributed control systems to realize real-time and reliable data communication between nodes. The application of CAN bus can reduce the body wiring and further save the cost. Due to the bus technology, only two signal lines are needed for signal transmission between modules. CAN bus system data is stable and reliable, CAN bus has the characteristics of small inter-wire interference and strong anti-interference ability, CAN bus is tailor-made for automobiles, fully considering the harsh working environment of automobiles, such as the powerful reverse charging voltage generated by ignition coil ignition, eddy current and surge current generated when the buffer is cut off. The inrush current generated when the buffer is cut off and the high temperature of the engine compartment of the car is about 100℃.