基于can总线的安全车距保持系统硬件设计.doc

论文题目：基于CAN总线的安全车距保持系统硬件设计 摘 要 本文首先进行了高速公路安全车距保持系统的总体设计，通过对CAN模块、红外测距模块、串口通信模块的设计,构成基于CAN总线的安全车距保持系统。整个系统可分为红外测距和主控制单元两个子系统，且CPU选用dsPIC30F4012单片机。红外测距子系统是实现车距信号的采集和处理，包括CAN模块、红外测距处理电路、报警电路等三部分组成；主控制单元是对红外测距子系统发过来的车距数据进行处理，判断目前行车的安全状况，同时把处理结果发送给制动和油门子系统。当自车与前车之间的距离小于所设定的安全距离并有可能发生碰撞时，该系统将发出报警，提醒驾驶员采取相应的措施，情况紧急时可直接刹车以避免碰撞事故的发生。 关键字：安全车距保持系统，CAN总线，红外测距，dsPIC30F4012单片机 Subject: The Hardware Design Of CAN Bus-based Vehicle Safety Distance Keeping System ABSTRACT This paper conducted the overall design of highway vehicle safety distance keeping system. By way of the design of CAN module, infrared distance measurement module and standard communication module, the construction of the system is based on safe intervals maintaining system of CAN Bus. The whole system can be divided into subsystem including infrared distance measurement and master control unit systems, and both of them adopted dsPIC30F4012 microprocessor. Infrared distance measurement subsystem carries out the collecting and processing of vehicles distance signals, consists of four parts including CAN module, infrared distance measurement processing circuit and alarm circuit. Master control unit processes the vehicle distance data sent out by infrared distance measurement subsystem, and determine the current safety status of the vehicles, at the same time, sends the processing results to braking and accelerator subsystems. When the distance between itself and the preceding vehicle falls into the set safety distance and collision is quite probable to happen, the system will give warnings to warn of the driver to take corresponding measures. Under urgent circumstances, direct braking can prevent collision accidents from happening. KEY WORDS：safety distance keeping system ，CAN bus，infrared distance measurement ，dsPIC30F4012 microprocessor 目录 第1章 绪论 1 1.1 概述 1 1.2 本课题研究意义与内容 1 1.3 本文内容介绍 2 第2章 高速公路安全车距模型的建立 4 第3章 系统方案设计 6 3.1 总体方案 6 3.2 单片机的选用及性能特点 6 3.2.1 dsPIC30F系列