The network technologies widely used in automobiles today mainly include CAN, FlexRay, LIN, MOST and LVDS. The above communication protocols are mainly promoted after the initiation of the automobile industry alliance organization, carrying a strong color of the automobile industry.
CAN is the most widely used automotive communication technology, which can be used for the transmission of various control commands and interactive data, and the transmission bandwidth can reach 1Mbps. The bandwidth of FlexRay technology can reach 20Mbps, and it can support multiple topologies, but the cost is relatively high. It is mainly used in mid-to-high-end vehicle-by-wire systems, such as steer-by-wire, shift-by-wire, and brake control. LIN is a low-cost automotive universal serial bus with a maximum transmission speed of about 20kbps. It is suitable for applications that do not have high requirements on the bandwidth, performance or fault tolerance of the network, such as the control of doors, windows and rearview mirrors. The main application scenario of the MOST bus is multimedia stream data transmission. Taking MOST150 as an example, its maximum transmission bandwidth can reach 150Mbps. However, because the supply chain system is relatively simple and the development cost is high, the main users are mid-to-high-end car audio-visual systems. LVDS is a communication technology based on electrical digital signals. It has high requirements for wire harnesses. Copper cables or twisted pairs are usually used as high-speed data transmission media. It is mainly used for digital video transmission, such as image data transmission between panoramic system screens and cameras.