【作者】 孙乐；

【导师】 彭继慎；

【作者基本信息】 辽宁工程技术大学 ， 电力电子与电力传动， 2011， 硕士

【摘要】 矿区自用加油站监控系统一般自动化程度较低,通常是由一些模拟器件(开关、指示灯、指示仪表等)构成的模拟式控制屏,这种控制方式主要依赖人工操作,存在监控画面粗糙、信息不全、数据记录统计工作量大、误差大、系统升级投资大(须更换许多硬件监控设备)、经营方式落后、财务制度不健全等问题。针对这些弊端,本文提出了用VB设计的上位机监控软件和下位机PLC构成的加油站监控系统,系统同时配合运用IC卡管理模式、人机触摸屏现场操作的设计构想和方案。本系统采用上下位机控制模式并结合了PLC、数据库、基于VB的软件设计和IC卡应用等关键技术,上位机以监控PC机为核心,配以多个读卡器;下位机以欧姆龙系列PLC为核心,配以人机触摸屏,控制终端执行机构(泵、阀、流量计等),充分发挥各自优势,经通讯后组成一个完整的加油站监控系统,实现了加油站日常作业的自动监控、规范管理。本文同时分析了加油站经常发生的水击和过冲现象产生的原因及其影响因素。以多级关闭的发油控制方式,精确的控制了油品流量,很好地防止了“水击”的发生,同时兼顾了发油效率。考虑到过冲问题对本系统发油精度的影响,本系统设计了基于流量的过冲量自动调节法来予以解决,并在此基础上给出了计算模型和具体程序设计。系统运行的效果表明,本系统达到了提高发油精度的目的,实现了油品流量误差的智能补偿。更多还原

【Abstract】 The automation degree of the gas stations monitoring used by coalmine usually is low.And usually it is analog control screen which is composed of analog devices(the switches, indicator lights and instruments etc.).This mode mainly depends on manual operation, there are so many issues,such as cumbersome monitor screen view, a small amount of information, the heavy workload of manual recording, big errors, large investment of system upgrading (have to replace many monitoring hardware device), operation mode backward and financial system distemperedness.In response to these shortcomings, this paper presents a new Ideas and programs,the control system is composed of the upper PC monitoring software which is programed by VB and lower PLC ,at the same time ,it also use of IC card management mode and HMI which is used for field operations. The control mode of the system combine upper and lower one and it uses many key technology, such as PLC technology, database technology, PC software design technology and IC card application technology,and so on. The core of the upper is monitoring PC,and together with series IC card readers; using the Omron Series PLC as the core of the lower witch coupled with HMI(Human-Computer Interface) to control terminal implementing agencies (pumps, valves, flow meters, etc.) ,everyone gives full play, and then they constitute a integrated monitoring system by communicating ,to carry out the aim of automated daily operations and standardized the management for monitoring stations.This paper analyzes the reasons and the effects which generates the water hammer and overshoot phenomenon that usually happen in control system of gas station at the same time. The control system achieves the opening and closing by multistage mode to control the oil value accurately , protect against water hammer and take into account the problem of efficiency enhancing.Taking into account the impact of the overshoot problem with the hair oil accuracy of system, the system design an way to resolve it which is overshoot automatically adjust based on the flux, and on this basis, it gives the computational model and specific program designs. The system running results show that it achieves the purpose to improve the accuracy of hair oil and to achieve intelligent error compensation.更多还原