基于 PLC 的自助洗车机控制设计目 录 第一章 绪论 1。1 课题背景·················································41。2 自助洗车机的优点·········································41.3 课题内容和主要工作·······································41。4 实现目标·················································6第二章 系统总体方案设计 2.1 系统框图设计及组成原理······································62.2 系统变量定义及分配表·····································72.3 系统接线图设计···········································8第三章 控制系统设计 3.1 控制程序流程图设计·······································93。2 控制程序顺序功能图设计··································103.3 控制程序梯形图设计······································12设计体会························································19参考文献························································19附录:控制程序指令表·············································20第一章 绪论1。1 课题背景我国汽车工业高速进展，中国汽车需求年均增长 24。5%，远远超过世界年均 4％的增长速度。我国已成为世界第二大汽车消费国。目前，我国汽车保有量(除 1390 万辆三轮汽车外）为 3595 万辆,私人汽车拥有量达到 2985 万辆.随着汽车保有量的不断增加,汽配流通市场得到了空前的快速进展，达到了 980 亿元市场规模。汽车产业链中关键一环的汽车清洗占了汽车美容项目的大头.市场调查表明：目前我国 60%以上的私人高档汽车车主有给汽车做美容养护的习惯。30％以上的中低档车车主也开始形成了汽车美容养护...
