基于单片机的电动车计价器设计毕业论文.docVIP

毕 业 设 计（论文） 2011 届 题 目 基于单片机的电动车计价器 专 业 电子信息工程 学生姓名 学 号 指导教师 论文字数 完成日期 2010-12-25 基于单片机的电动车计价器 摘 要：随着人们环保意识的加强，电动车越来越受到人们的青睐。电动车的普及和发展给人们提供了一种安全舒适，无噪音，无污染的生活环境。电动车出租行业迅速发展，计价器的市场需求量也大大增加。本设计以AT89C52 单片机为中心、附加A44E 霍尔传感器测距，实现对出租车计价统计，输出采用LCD显示管。本电路设计的计价器能实现基本的计价，可以测量车辆的实时速度，算出乘客应付的总价格，当速度达到或超过规定的上限时，会发出超速警告。为了减少不安全事件的发生，利用单片机实现车辆的超速报警来提醒司机减速行驶，当蓄电池里的电力接近下限时，会发出警报声。通过对汽车蓄电池电压进行监测，以电压临界值与电流变化率为指标，带以温度补偿修正，当车子蓄电池电量过低时监测系统发出警报。该监测系统能在车动态时判断发动机能否正常启动，发电机能否正常工作；在车静态时能判断蓄电池是否正常到达目的地同时在不计价的时候还能作为时钟为司机同志提供方便。 关键词：AT89C52，霍尔传感器，DS1302，计价器 Abstract：Along with increasingly of environmental awareness，electric cars are preferred by people more and more. The popularization and development of electric cars provides people a convenient and efficient vehicle which is safe, comfortable and without noise or pollution. With the rapid developing of electric car tenancy, the market demand of meter will increase a lot. Our product uses AT89C52 SCM as the center ，additional A44E Hall sensors distance measurement to realize the taxi valuation statistics，output with LCD display tube。The taximeter based on this electric circuit will not only for basic valuation statistics, to test the speed of the car and submit the total cost passenger should pay, but also can remind driver once driving limited broken. To avoid danger, the overspeed warning will remind drive to slow speed. It also will give alarm sound while the battery power reaching to lower limit. Under the monitoring to the battery voltage, indexed by Voltage threshold and Current rate of change, with temperature Compensation, the monitoring system will sound alarm when battery power is too low. This monitoring system can judge whether the engine starts and works normally when the car in the dynamic; also it can judge whether it is