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Automotive electronics technology integrated into the control system, and the sharing of information, the development of a new stage of the functions intelligent. Passenger for a large number of domestic passenger car use traditional instrumentation, the traditional point-to-point control of communication, as well as independent control unit, this paper discusses the operation and control systems for passenger cars, developed based on CAN bus technology, intelligent detection technology, microcomputer control technology operation and control system. The system to change the passenger's the harness control mode and traditional instrumentation, centralized detection of electrical information, control, and data sharing, easy to expand, reducing the wiring harness, to improve maintenance and reliability, and reduce costs. This paper analyzes and discusses the bus electronic control system and vehicle network technology development status and trends in the application of CAN bus instead of a bus passenger traditional harness transmission, in-depth study of the CAN bus technology and passenger electric control on the basis of design based CAN bus passenger combination of instrumentation systems and, after input and output modules, bus electrical information detection, control, transmission, and display. SPI mode MC33970 stepper motor drive combination meter main electrical information transmission and display enhanced the CAN control modules PIC18F8585 microcontroller as the central controller, PIC18F8585 control TJA1040 CAN bus drive to receive and send information CAN bus; Communications, Control MS XC5 stepper motor real-time display on the parameters of the speed, engine speed, cooling water temperature, oil pressure, fuel level, voltage, gas pressure 1 and pressure 2 eight; single mileage control the LCD display, the total mileage and The various warning information, the buttons control the LCD scroll off the display; controls the LED display the bus electrical fault and status information. Main input and output module electrical information detection, control and transmission, using PICI8F8585 MCU as the central controller, the control input module detects the vehicle speed, engine speed, eight parameters as well as a variety of switch will disperse the electrical appliances centralized information processing, and then through power modules to control lights, instrument information through various relays, DC motor to perform the corresponding function, and the acquisition drive TJA1040 send the instrument cluster display, and information sharing. The system by computer on-line debugging and system simulation test validated the system's overall performance and reliability of the CAN bus communication, initially reached the intended purpose and requirements for the next step of improvement and perfection laid the foundation.
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