The Design And Inplement Of Display System Of Vehicle Information Based On J1939 Protocol

The display instrument of vehicle information is the alternant interface between vehicle and people,which provides driver with the necessary running parameters of the vehicle,the state of xehicle, malfunctions , and so on. It's an absolutely necessarily components of the vehicle. The intuitionistic, handsome instrument make drive not only become possible to substitute foot, but also become a part of comfortable life. At the same time, the nicety and credibility of parameters transfer also decide the security of driving.Traditional auto instrument mainly based on mechanical principle, the way of communication mostly is by wiring harness. There are many shortages such as too much signal transmission lines, big electromagnetism disturbs, big instrument cubage, low display precision,can not realize the share of auto information, and so on.This design is mainly aimed at developing a vehicle information display unit based on J1939 protocol for the purpose of being used on an engineering operation vehicle with ECU (Engine control unit) electric diesel engine installed, According to alaynise of the system's functions,design the software,combining the hardware circuits which has been designed,write the software's flow chart.The LCD instrument system of the vehicle based on J1939 protocol overcome the shortages of the traditional auto instrument, which can display the complex parameters of the hybrid vehicle in a lively and visual way. The LCD instrument system is of the following characteristics,realizing the share of the auto information by CAN bus, credible transfer and display information, small instrument cubage, strong system expand ability, good real time ability and high precision, abundant and lively display contexts.In the end, the communication and display experiment is completed. The experimental results show that every circuit of this control system has a logical design and runs smoothly, so we believe this system has reached the anticipated purpose. Besides, the lack and the work which need to improve of my work are also present.