CAN bus is the equivalent of a car's central nervous system, is a kind of communication protocol in the car. It is equivalent to connecting many automobile computers to these two wires to realize data **** enjoyment.
1, CAN bus is divided into CAN high line and CAN low line, is made of two copper made wire. Its role is to connect multiple control units such as automotive instrumentation, transmission, auxiliary braking system, ECU, control module, various sensors, etc. together to achieve real-time synchronization of information. In layman's terms, it is like a telephone line that connects various components for communication and data transmission.
2, CAN bus system application greatly simplifies the layout of the body line, the body function increases, but the wiring harness is correspondingly simplified, while the wiring harness is simplified to bring more convenience to the maintenance.
CAN bus features:
1, network between the nodes of the data communication in real time
The nodes in the network can be based on the bus access priority using a lossless structure of the bit-by-bit arbitration way to compete to the bus to send data, and the CAN on the Communication data is encoded, which allows different nodes to receive the same data at the same time, these features make the data communication between the nodes of the network composed of CAN bus real-time, and easy to form a redundant structure to improve the reliability of the system and the system's flexibility.
2, short development cycle
CAN has a perfect communication protocol can be realized by the CAN controller chip and its interface chip, thus greatly reducing the difficulty of system development, shorten the development cycle, these are only electrical protocols can not be compared to the RS-485.
3.International standard fieldbus
CAN bus is a high communication rate, easy to realize, and cost-effective and so on a lot of characteristics of an international standard fieldbus. These are the reasons why CAN bus is used in many fields and has strong market competitiveness.
4, one of the most promising fieldbus
Compared with the general communication bus, CAN bus data communication has outstanding reliability, real-time and flexibility. Due to its good performance and unique design, CAN bus is getting more and more attention. Its application in the automotive field is the most extensive, and some famous automobile manufacturers in the world have adopted CAN bus to realize the data communication between the internal control system of the automobile and each detection and actuator.
Reference to the above? Baidu Encyclopedia-CAN bus