What does the Can bus used in cars mean?

CAN Bus-Controller Area Network (CAN) is a set of automobile standard buses specially invented by Robert Bosch Company for automobile connecting equipment. Originally established for the automobile market (as an automobile bus), it has been applied to the transformation from high-speed network to low-cost multi-component wiring harness. Precise design of data connection scheme for CAN. It includes logical connection control (LLC), including data transmission control, lower layer and information transmission control (MAC), including the control of each control unit, lower layer and physical layer of ISO/OSI related mode. All other protocol layers are left to the designer to choose. In CAN mode, all devices including sensors and control units are connected to the main line of signal sharing. During data transmission, CAN system forms multiple data carrier channels/collision avoidance (CSMA/CA) according to certain rules. For example, if two or more devices transmit information at the same time, which information is allowed to continue transmission is determined according to the priority based on certain rules. In this way, the circuit connection of automobile control system is optimized, data transmission and data analysis are accelerated, which is beneficial to the comprehensive management of automobile by ECU and greatly increases the safety of the system. This is a dynamic protocol that detects and records faults, automatically confirms and checks faults, and uses binary information of 1MB.