毕业论文基于EDA的出租车计价系统设计详解.docVIP

摘 要 汽车计价器是乘客与司机双方的交易准则，它是出租车行业发展的重要标志，是出租车中最重要的工具。它关系着交易双方的利益。具有良好性能的计价器无论是对广大出租车司机朋友还是乘客来说都是很必要的。因此，汽车计价器的研究也是十分有一个应用价值的。 随着生活水平的提高，人们已不再满足于衣食住的享受，出行的舒适已受到越来越多人的关注。于是，出租车行业以低价高质的服务给人们带来了出行的享受。但是总存在着买卖纠纷困扰着行业的发展。而在出租车行业中解决这一矛盾的最好方法就是改良计价器。用更加精良的计价器来为乘客提供更加方便快捷的服务。 我国在70年代开始出现出租车，但那时的计费系统大都是国外进口不但不够准确，价格还十分昂贵。随着改革开放日益深入，出租车行业的发展势头已十分突出，国内各机械厂家纷纷推出国产计价器。出租车计价器的功能从刚开始的只显示路程（需要司机自己定价，计算后四舍五入），到能够自主计费，以及现在的能够打一发票和语音提示、按时间自主变动单价等功能。随着城市旅游业的发展，出租车行业已成为城市的窗口，象征着一个城市的文明程度。本文中所用到的VHDL（Very High Speed Integrated Circuit Hardware Description Language）就能解决上述问题，因为本设计就是采用VHDL硬件描述语言作为设计手段，采用自顶向下的设计思路，得到一种出租车计价系统的硬件结构，通过在max+plus2软件中编译和下载测试，得到了仿真波形和关键的设计结果。经过在实验箱上进行硬件测试，证明出租车计价系统具有事先出租车计价器的基本功能。 文章首先简述了出租车控制系统的意义和发展现状以及VHDL语言的特点，然后介绍了出租车控系统的设计要求，设计思路，并给出了总体设计框图，通过分析方框图绘出详细的模块电路流程图并写出程序源代码，将代码在max+plus2软件上进行编译仿真，波形基本符合设计要求。 关键词：出租车计价器 VHDL语言 max+plus2 ABSTRACT Auto meter is both passengers and the driver of the trade standards, it is an important symbol of the taxi industry development, and is the most important tool in the taxi. It relates to the interests of both parties. Have good performance of the taxi driver meter whether friends or passengers alike is very necessary. Therefore, the study is also very car meter is an application value. As standard of living rise, people no longer eat satisfied enjoy comfortable, travel has been more and more peoples attention. Hence, the taxi industry with low quality of service has brought people travel to enjoy. But there are always trading disputes bothering industry development. But in the taxi industry to solve this contradiction in the best method is improved on the meter. Use more sophisticated meter to provide more convenient services. Now cities taxi industry has universal meter automatic meter, so the development of technology already entrenched. And some of the smaller cities, but not with the urban construction speed increasingly, a symbol of the taxi trade city appearance will accelerate the development of popularizatio