Design And Exploit On Vehicle-mounted Monitoring Terminal Of Electric Vehicle

Since the deterioration of oil crisis and ecological environment, the “Energyconservation and emission reduction” theme has attracted world-wide attention.In the development of auto industry, electric cars will become the inevitable trendin the future because of energy saving and environmental protection. One of themost concerned about is the safety of electric vehicle and it is very necessary tomonitor and analyze the electric car driving information, status messages andpower battery information in order to realize remote control and pre-alert inadvance. Therefore, design electric vehicle monitoring terminal can ensure thesafety of electric vehicles, protect the environment, save energy. It has very far-reaching significance.This paper briefly introduced the present situation of vehicle monitoringsystem and online prediction research of the battery charged state at home andabroad. On the familiar basis of CAN-Bus, GPRS wireless communication, GPS,etc, developed an electric car vehicle-mounted monitoring terminal which isbased on ARM Crotex-M3. It basicly meets the design requirementsSTM32F103R8T6integrated with CAN controller as the core processor isapplied to acquire and send field data. It is combined with TJA1050high-speedCAN transceiver, SIM908module to realize the hardware platform design ofvehicle-mounted monitoring terminal. Use TC35module of Siemens to realizethe transmission of performance and error information by AT command. Softwaredesign of vehicle monitoring system mainly includes the CAN-Bus system,GPRS wireless communication and monitoring center software design. Using Clanguage in Keil uVision4development environment to write and debug theprogram. Exploit data service software using C#. Establish database server andweb server to realize data collection and wireless transmission of the electricvehicle. Users can be intuitive to check the vehicle position information and power battery information by IE explorer. It also has the functions of data storageand map playback.Estimate SOC with extended Kalman filter based on composite patternthrough the data of voltage, temperature and current which is acquired fromvehicle-mounted monitoring terminal. This method can accurately predict thebattery SOC with a small error, high reliability, etc. The monitoring terminal forelectric vehicles proposed in the paper has gained a good reputation inperformance, communication, manipulation and expansibility. It has certaintheoretical research significance and economic benefits.