Can Bus-based Multi-function Trip Recorder

Under the study of the automobile data recorder at home and abroad, an advanced multi-functional security monitoring system for car is developed, which takes advantage of the technology progress in the fields such as electronic, computer, sensor and controlling. The system not only performs the general functions such as detecting, alarming and so on, but also possesses LCD interface to report parameter and working conditions, and the controlling functions.To perfect the function of the system, improve the advances, and guaranty the credibility, CAN bus is adopted, which makes it possible for users to add units (CAN monitoring module) dynamically to meet different needs, without the least changes of the system's hardware. The monitoring system is made up of four smallest units, one controlling unit, and one main unit. The smallest unit is to sample signals, perform A/D function, and send them to the main unit using CAN bus. Finished processing the received data, the main unit displays the result, the controlling unit sends out controlling signalsThe design idea, the total scheme and the correlative basal knowledge of the hardware and software of the main unit and smallest unit are discussed, and some key sections are analyzed in detail.