Research For CAN Network Management Based On In-vehicle Gateway

With the continuous development of automotive electronic and computer controltechnology, more and more automotive electronic control unit (ECU), automotive electronicslevel is getting higher and higher, the role of electronic and information components in thesystem is also more important. Therefore, in modern car design, vehicle network has becomethe technology that must be used. The most commonly used method is Controller AreaNetwork (CAN) bus technology, the CAN bus is safe, reliable, and effective support fordistributed real-time control protocol specification features, but also make the automotivefailure analysis become complicated, leading to the cause of the malfunction is not easy todetermine. If the vehicle ECUs failure, the electronic control module for transferringinformation will not work properly, the driving of motor will be potentially dangerous, so thenetwork management mechanism for CAN nodes becomes very important.In order to resolve the management of automotive Electronic Control Unit, the CANnode network management platform based on In-vehicle Gateway has been established basedon CAN technology standards and OSEK/VDX specifications. Also, the standard protocolsfor analyzing low-speed CAN network application packets and monitoring networkmanagement packets are developed. ARM9is used as a hardware development platform forIn-Vehicle gateway, which integrates the CAN module that can be connected to the CANnetwork device.The development of the CAN virtual device is completed by Linux kerneltechnology. The ECUs inside the car connect to the low-speed CAN network. The data aretransmitted to the in-vehicle gateway via CAN bus, and the in-vehicle gateway sends thewarning message to vehicle terminal. The messages communication with outside environmentare dispatched and received by CDMA/WLAN wireless communication.The data enter intointernet via the transceiver in base station and could be sent to the remote fault diagnoseplatform via TCP or UDP, connecting with the remote server synchronously.When the remote server or host computer send data to the In-Vehicle Gateway,In-Vehicle Gateway will get the data field in packet and sent the data to the CAN bus, thecontrol command will be sent to the corresponding electronic control node. The electroniccontrol nodes detect the state of the controlled device and delivery the equipment state code tothe gateway, and network management mechanism will send the current node status togateway in real time.The In-Vehicle gateway will encrypt the data and send it to the remoteserver.In this study, we utilized the vehicle network remote server platform and CAN analysis tool ZLGCANTEST to test the CAN data and analyze its real time monitoring state. Theresults indicate that CAN node network management platform based on the In-VehicleGateway can complete node detecting rapidly, and report node fault information for vehiclenetwork remote fault diagnosis promptly.Research and development for CAN network control management technology andautomotive electronics products that have independent intellectual property rights, which havea great significance to improve the competitiveness of China’s automobile industry in theinternational arena.