Development Of Monitoring And Controlling System For Automobile Data Base On CAN

As the auto tech grows rapidly, automobiles have already become the necessities inpeople’s daily life. But there’s a lack of efficient and real-time ways to monitor orprevent the system fault during car was running. Compared with most products in recenttimes, they were all working as external devices not plug-in ones, and most of themneed to setup outside sensors to get data. This would cause a serious problem of toolittle data categories or not desired. Also the whole system is not easy to expand. Sofar the vehicle electronic developed, CAN-bus has been the standard bus in auto for along time and it is integrated in the OBD.CAN-bus can guarantee the real-time,accuracy and some other features of the data, meanwhile it is no need to build theoutside line. So the combination of CAN and remote monitoring is better in getting thevehicle conditions real-time and analyzing or judging the potential hazards in order tomake a warning and preventing. Engineers can also diagnose or fix the problemsremotely.The system is combined with technology of CAN-bus data acquisition,NAND-Flash memory access,3G remote data transferring and the science of computer.There’re two CPU are working in the system. The main processor is LPC17xx and thecoprocessor is MCS-51,their missions are to complete data acquisition and then send tothe server. The sever send the data consists of GPS and car-body into the data base andthen to the client after receiving the demand. The client displays these data and thenmakes a record in the background file to complete the monitoring. Through theacquisition technology of CAN-bus we can get dozens of car-body data with highprecision and it’s a great help to diagnose automobiles’ electronic system failure thatthere’s lots of failure diagnose data include. Moreover, this article presents a losslesscompression scheme that is combined with redundant processing and adaptive Huffmancoding. The simulation results show that the new scheme can effectively raise thecompression ratio and solve the problem caused by small-format data in traditionalHuffman coding. The software development is based on C/S structure, with a separateof the sever and client, the server only needs to maintain the data base and the bottomdrive. The client’s work is to make a User-friendly interface and a map localization andbackup of background file. The system is also an idea of open platform, the format ofbackground file is opened for all developer to make a second development. With the development of the scheme, system has finished these works as follows:The system can receive CAN data and write to Flash memory; Data can be send throughDTU remotely and client can finish display; Algorithm has finished research in theoryand simulation; Client and electronic map has finished design in functions and interfaceas first version; USB and Mask algorithm were integrated into client and user can usethe configured file to complete file conversion; System testing was completed, C/Smodel was basically set up.