The Design And Research Of Passenger Car Run Control System Based On Controller Area Network

Automobile electronics technology will come into a new stage on which it is characteristic of control system integration, share messages and intelligent performance. In allusion to use largely out-of-date meter, old control communication mode with single wiring harness and unconnected control units at the present time in a passenger car, this paper discusses run and control system, it develops a run and control system adopting CAN bus technology, intelligence detecting technology and microcomputer control technology. The system changes control mode of wiring harness and traditional meter, centralizing check and measure, control of electric apparatus messages and share data messages, extend easily, reducing wiring harness, improving credibility and maintainability, reducing system cost.This paper analyses and discusses development actuality and direction of network technology and electronic control system in a car, bringing forward bus transmission mode substituting CAN bus for traditional wiring harness in a passenger car, based on reseaching CAN bus technology and electric apparatus control of a passenger car deeply, it designs a meter assembly system and front, rear input out module for carrying out checking and measuring, controlling, transmitting and displaying electric apparatus messages in a passenger car. Meter assembly system carries out transmitting and displaying electric apparatus messages, it adopts the PIC18F8585 serieses Single Chip Micyoco which includes Enhanced Controller Area Network (ECAN) module as center controller, PIC18F8585 controlls TJA1040 CAN bus drive for receiving and sending messages from CAN bus, exchanging messages with MC33970 step motor drive to drive step motor M-S XC5 to display eight parameters real-timely: car speed, engine rotate speed, cooling fluid temperature, oil pressure, oil capacity, voltage, air pressure 1 and air pressure 2, driving LCD to display single mileage, total mileage and many kinds of warning messages, turning LCD screen by key-press, controlling LED indicator light for to show breakdown of electric apparatus and state messages. Input out module carries out checking and measuring, controlling and transmitting electric apparatus messages. also using PIC18F8585 serieses Single Chip Micyoco as center controller, checking and measuring all kinds of switch messages and eight parameters: car speed, engine rotate speed and so on by using input module, dealing with messages of dispersive electric apparatus concentratively, then driving car lump, many kinds of relay and direct current electromotor using power module, using TJA1040 CAN bus to share messages with meter assembly.The system has been tested on-linely and emulated using computer, and the result argued that general performance of this system accorded with the anticipant purpose and request, and it also establishes foundation for the next improvement and perfecting.