CAN COMMUNICATION SYSTEM: System Description: Description
- CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
- The following control units include a gateway function and communicate signals between the different CAN communication circuits.
CAN communication circuit Gateway control unit Reference CAN communication circuit 1 <==> CAN communication circuit 2 CAN gateway "SYSTEM DESCRIPTION " CAN communication circuit 1 <==> HEV system CAN circuit HPCM "CAN COMMUNICATION: SYSTEM DESCRIPTION " CAN communication circuit 2 <==> ITS communication circuit ADAS control unit "SYSTEM DESCRIPTION " - Termination circuits (resistors) are connected across the CAN communication system. When transmitting a CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to the CAN-L line. The current flows separately into the termination circuits connected across the CAN communication system and the termination circuits drop voltage to generate a potential difference between the CAN-H line and the CAN-L line. The system produces digital signals for signal communications, by using the potential difference.