Research And Design Of Commercial Vehicle Terminal System Based On Internet Of Vehicles

With the rapid development of social economy,cars have become an important part of people’s lives.With the implementation of heavy-duty National VI Standard A and B and the issuance of "Technical Specifications for Electric Vehicle Remote Service and Management System" by the Ministry of Industry and Information Technology of China in 2017,it is imperative to monitor traditional and electric vehicles.All major car companies are in Develop platform-based vehicle terminals to meet the needs of different platforms and different series of models.This dissertation uses Qualcomm Open CPU as the software architecture,adopts the embedded Linux operating system,and takes the functional requirements of the Internet of Vehicles as the research object to carry out the software development and hardware design of the on-board monitoring terminal of commercial vehicles.In terms of hardware,the peripheral circuit design and key module construction are mainly carried out,and in the software aspect,the application layer software logic design is mainly carried out.Aiming at the problem that a single control unit is difficult to handle high-complexity and real-time tasks,a dual-control-unit system is designed.The control unit 1 can handle tasks with complex working logic and lowefficiency requirements,including 5G,GNSS,WIFI,USB,and Voice.The control unit 2 adopts a single-chip microcomputer,and can realize functions such as CAN communication,switch value acquisition,Bluetooth,security chip,and backup battery management through a real-time operating system.The research content of this dissertation is as follows:First of all,combined with the design requirements of the vehicle terminal,the overall design scheme is formulated.On the basis of the overall scheme,the on-board terminal initialization scheme,on-board terminal diagnostic calibration scheme and on-board terminal power management scheme are designed,and CAN bus technology,GPS technology,5G communication technology and on-board Ethernet technology are loaded into the design of subsystem modules.Secondly,build the hardware and software system of the vehicle terminal.The main controller of the hardware system selects the dual-system unit system and takes the dual-control unit as the core to carry out the principle design and selection of the surrounding system,including power management peripheral topology design,sleep wake-up peripheral Topology design,CAN module acquisition process and peripheral topology design,the control unit module system internal logic block diagram description,GPS module selection and peripheral topology design,Bluetooth module design,etc.The software part of the vehicle terminal is driven by the application scene of the CAN signal,and the application layer software logic design of the driving behavior analysis,remote control module,vehicle diagnosis module,Bluetooth key,and lock management is carried out.Finally,through the strong detection test,CAN communication test and real vehicle dynamic and static test,the CAN communication,data acquisition and functional performance of the vehicle terminal are verified.The results show that: the vehicle position,vehicle status,vehicle operation mode,The data collection of total voltage and the total current is normal,the positioning information is accurate,and the information transmission is reliable.