基于双CPU的智能汽车行驶记录仪

Intelligent Vehicle Information Recorder Based on Double CPU

针对当前汽车行驶记录仪功能单一、信息量不足,无法提高交通事故分析的准确性的现状,设计了一种基于MCU+DSP结构的汽车行驶记录仪。MCU通过CAN总线管理智能传感器信息采集网络,提高系统的扩展性,采用基于USB总线的存储器保存数据,实现海量存储。DSP实现了GPS/DR组合定位算法,完善记录仪定位的功能。详细介绍了系统硬件结构设计,并针对"MCU+DSP"这种特殊结构合理设计了软件流程。

In this paper,a vehicle travelling data recorder based on MCU＋DSP is designed.It is much improved from the current one which fails to provide multiple functions and enough information,therefore leads to inaccuracy in analyzing traffic accidents.On one hand,the MCU scheme expands the function of system since the network of intelligent sensor is enlarged through CAN bus.Meanwhile,with USB bus-based memory,and it realizes mass storage.On the other hand,integrating GPS/ DR orientation system,DSP enhances the positioning accuracy.