The diagnosis process of the entire VDC domain controller includes remote diagnosis, local diagnosis, and OTA diagnosis. When constructing a diagnostic channel for these three types of diagnostic models, it is necessary to first connect the VDC to the vehicle end network to realize two diagnostic modes DoIP and DoCAN. Usually, DoIP is deployed on the MPU, and DoCAN is deployed on the MCU. Deploy the DoIP gateway through the VDC protocol stack to establish a link (including support for DoIP-DoIP, DoIP-DoCAN bidirectional diagnostic routing), and deploy the DHCP client.
For diagnosis, it is generally necessary to set the corresponding access arbitration management mechanism according to the following different diagnosis access scenarios. These diagnosis scenarios include local diagnosis, remote diagnosis, OBD access under production line EOL, and in-vehicle virtual host computer access under OTA scenarios. These three types of OBD access sub-scenes are usually not specifically distinguished, but only through priority judgment can one of the links be activated at a certain fixed moment.