What is automotive CAN bus? Chengdu Panfeng Technology

We often come across the term bus when understanding the structure of automobiles. In engineering practice, bus is the customary name for the standard serial data transmission system in automobiles. The full English name of bus is r, which means area network controller. It was first used for information transmission in intelligent residential areas. The bus originated from computers because its function is similar to B in computers.
Modern cars use more and more electronic control systems and communication systems, such as engine electronic control systems, automatic transmission control systems, anti-lock braking systems (B), automatic cruise systems and vehicle-mounted multimedia systems, etc. , between these systems. Data exchange is required between the system and the car's display instrument, and between the system and the car's fault diagnosis system. For such a huge amount of data exchange, if the traditional data exchange method is still used, that is, the transmission method of point-to-point connection using wires will It is unimaginable. According to statistics, if ordinary cables are used, a mid-level car will need about 2 cable plugs, the total number of pins will reach about 10, and the total cable length will exceed 2.5. Not only is the assembly complicated, but the failure rate will be very high. Therefore, replacing it with a serial data transmission system becomes an inevitable choice.
Data can be transmitted one after another on the serial bus. All subsystems participating in the bus can send and receive data through the bus interface on its control unit. The bus is a multi-channel transmission system. When a certain When a unit fails, it will not affect the work of other units. The bus has different transmission rates for different data. It implements high-speed transmission of real-time control data such as engine electronic control system and B. The rate is baud dhM baud. For the body adjustment system The data of (such as air conditioners) is transmitted at low speed, with the transmission rate in baud, while other data such as multimedia systems and diagnostic systems are transmitted at medium speed, with the rate in between. This distinction improves the transmission efficiency of the bus.
How can the data bus achieve multiplexing? It turns out that the data bus consists of three parts:) data transmission line,) address transmission line,) transmission control line between the sending unit and the receiving unit. Data is transmitted to the specified address in a certain pattern according to the instructions, and the transmission mode is controlled by software.
Chengdu Panfeng Technology is committed to the experimental development of automotive electronics and bus networks, and practical training and teaching equipment. It independently develops and provides product schematics and source programs for secondary development. Can simulate, record, simulate and send communication information! For more details, please consult
[Business Contact] Cai Peiying (Xiao Cai)
[Business Telephone]
[QQ] qq
[WeChat]