Design And Implementation Of The New Automotive Instrument System Based On CAN Bus

Currently,the automobile has entered an intelligent age of the combination of the network and digital.The structure of automotive instrument system is more and more complicated.It becomes one of the hot spots to make the instrument system with the advantages of various functions,simple structure,safety and reliability in the development and research of automotive industry.In this thesis,a new automotive instrument system based on CAN bus communication technology is designed.It has the characteristics of simple wiring,high speed transmission and reliability.Moreover,it also overcomes the problems of traditional electromechanical,pointer meter wiring complexity,low reliability and poor data transmission stability.The main work is as follows:1.According to the functional requirements of automotive instrument,the hardware design of the overall structure is carried out.The main work of hardware design includes: the selection of main modules.the system uses Fujitsu MB594 as the core microcontroller,which has an internal integrated CAN controller.And NXP TJA1042 is used as a CAN transceiver.A 3.5-inch Color TFT-LCD of AUO is used for data display.The main control circuit and peripheral circuit of the instrument system are designed by Altium Designer software,then the circuit diagram and circuit board of PCB are given.2.Based on the hardware design of the instrument system,the software is designed.The main work of software design includes: modular processing of the system.Using C language in the softune workbench V6 development platform to encode and debug the functional modules of the instrument system,which includes the main module,data collection,CAN communication,cruise control,TFT-LCD liquid crystal display and other major modules.3.The constant current source circuit is designed using low power dual operational amplifier LM2904.The simulation results show that the circuit can solve the flicker problem of the instrument LCD backlights in Saber software.4.Using the CANoe,the CAN bus test and instrument function verification of the system are carried out by the test waveform and the display information.The results show that the CAN communication network of the instrument system is normal,so the set target function of automotive instrument can be achieved.