Design Of Automotive Gateway And Its Function Evaluation System For New Domain Control Architecture

Cars are transforming from mechanical devices into mini-data centers on wheels.A large number of applications of advanced driver assistance systems(ADAS),on-board diagnostic systems(OBD),on-board infotainment systems(IVI),autonomous driving and the development of unmanned driving technology are promoting the trend of automobile networking and broadband.The automotive industry is undergoing an unprecedented and profound change with the emergence of a new automotive bus-on-board Ethernet application.The evolution process of in-vehicle Ethernet is divided into three stages: subsystem level,architecture level and "domain" level.In the final "domain" level,in-vehicle Ethernet is used as the backbone of the car network.In several domains such as the dynamic domain,body,auxiliary driving domain and infotainment domain,the on-board gateway acts as a router and a central computing unit between the vehicle network domains,solving a large number of communication requirements between each "domain".Currently,most electronic and electrical architectures of vehicles adopt distributed architectures.The evolution process of on-board Ethernet is still in its initial stage,and many problems need to be solved urgently.In this paper,an on-board gateway controller for the new domain control architecture is designed based on the multi-core processor MPC5748 G,which solves the problem of large amount of data exchange in the vehicle of the new domain control architecture.On this basis,the gateway controller function evaluation system is developed,and the designed gateway controller is further verified to meet the requirements of IEEE standard by experimental test.The main work of thisCurrent electrical and electronic architectures of vehicles mostly use distributed architectures.The evolution of vehicle Ethernet is still in its infancy,and many problems need to be resolved urgently.Based on the NXP vehicle-level multi-core processor MPC5748 G,this paper designs a vehicle gateway controller for the new domain control architecture,which solves the problem of large amounts of data exchange inside the vehicle of the new domain control architecture.From there a gateway controller function evaluation system was developed,and experimental tests were conducted to further verify that the designed gateway controller meets the requirements of IEEE standards.The main work of this paper is as follows:(a)The development status and trend of traditional automotive bus CAN,LIN,FLEX RAY,MOST,CAN FD and new vehicle Ethernet bus protocols are compared and analyzed,the new "domain" level automotive network architecture is analyzed,and the overall design scheme of gateway controller for the new domain control architecture is given.(b)Based on the multi-core processor MPC5748 G,an on-board gateway controller for the new domain control architecture is designed,which realizes 4-way on-board Ethernet interface,1-way conventional Ethernet interface,8-way CAN/CAN FD communication interface and 2-way LIN communication interface,solving the problem of large amount of data exchange inside the vehicle of the new domain control architecture.(c)Based on IEEE STD 802.3-2015 Vehicle-mounted Ethernet 100Base-T1 standard,a conformance test scheme for vehicle-mounted Ethernet 100Base-T1 is presented,and a gateway controller function evaluation system is developed.The amplitude,timing characteristics,link connection stability,channel quality,transmission loss,radiation and other signals of the physical layer of the gateway controller interface are comprehensively tested for consistency to ensure product interconnection performance and network communication quality.(d)The gateway controller for the new domain control architecture designed in this paper is experimentally tested and analyzed by using the established gateway controller function evaluation system.Test results show that the physical layer consistency of the gateway controller communication interface designed in this paper meets the requirements of IEEE vehicle-borne Ethernet standard,ISO11898/ISO16845 CAN/CAN FD international standard and CAN/LIN conformance test specification for OEMs.