Research And Development Of Vehicle Remote Monitoring System Based On 4G And FlexRay

As more and more Electronic Control Units were connected with vehicles through in-vehicle bus network,the traditional in-vehicle bus can not meet the requirement of the future development.Meanwhile,with the gradual development of automated vehicle and automatic pilot technology,the problem of relatively isolated vehicle information needs to be solved.To achieve the communication between the internal network and the external network has become the key research area of vehicle development.The vehicle bus in this thesis selects the new vehicle bus —Flex Ray bus,which has great advantages over the traditional CAN bus in terms of transmission rate,number of channels,topology,data length and number of supporting nodes.At the same time,it combines with the new mobile communication technology —4G technology,finally to achieve the communication between the vehicle network and the external network.This thesis analyzed the network structure and network protocol on two kinds of heterogeneous networks,vehicle Flex Ray bus network and 4G mobile network,put forward using embedded ARM as a gateway to achieve interconnection between two heterogeneous networks,and designed the model and method of protocol conversion.At the same time,gateway needs to connect with 4G module,transmits the converted data to the cloud server through the 4G module,and finally monitor the vehicle equipment through the Android client.To achieve the purpose of remote monitoring of the equipment on the Flex Ray bus bus anytime and anywhere.In the process of data transmission,in order to ensure the security of transmission information,the hybrid encryption algorithm based on RSA and Base64 is applied in the data transmission process between Android client and server side.In the process of data transmission,in order to ensure the security of transmission information,the hybrid encryption algorithm based on RSA and Base64 is applied in the data transmission process between Android client and the server.The system gateway of this study selected ARM9 series S5PV210 chip as the core processor and designed the peripheral interface circuit of the gateway,and gateway software platform selects Linux operation system whose main function is to realize protocol conversion between two heterogeneous networks.The 4G communication module selects the EC20 LTE module of Quectel Wireless Solutions Co.Ltd and the 4G SIM card of China Unicom.The server side is developed with Java language.The development tool includes My Eclipse,the Tomcat server and the My SQL database.The server side programming architecture selects Spring MVC+Spring+Mybatis' s SSM framework,Baidu cloud BCC cloud server,and deploys the compiled server-side program to the cloud server.The Android terminal program is developed by using the Android Studio development tool,mainly accomplishes the realization of the related UI interface and the procedure of interacting with the server.JSON's data format is used to complete data interaction between Android client and the server.The encryption and decryption programs are written on the Android end and the server side to ensure the security of the data transmission.To verify the correctness and effectiveness of this study and related design,A test and verification has been done for the design,and the function of each part respectively was tested.The test results show that: The gateway can implement the protocol conversion function;the 4G module can accurately upload data to the cloud server;the server side can receive data from the 4G module and complete the forwarding and storage;the Android client can receive data from the server side and complete the display;the application of the encryption algorithm is reasonable.