程序设计采用分模块编写的设计方式，软件程序使用了汇编语言编写。主要包含的程序有：主程序；采样子程序；计算子程序，延时子程序，滤波子程序和显示子程序等。同时，在软、硬件设计时采用了一定的抗干扰措施。
经过硬件分析和软件测试证明本系统完全符合要求，基本满足施工单位对沥青计量的要求，具有很强的测量功能和较高的使用价值。
关键词：沥青；计量系统；单片机；流量计算；温度传感器
Abstract
In asphalt highway construction, asphalt is must be used, so it must be measured in the use of asphalt. Therefore, it is very important for the asphalt industry to develop a pitch automatic measurement system with high accuracy, simple method and high performance ratio.
In this paper, the automatic measurement system of asphalt is developed by using the single-chip microcomputer control system.. System to AIT Mel company's AT89C51 monolithic Maple as the core, with software system, can achieve a plurality of signal collection, through the temperature sensor automatic measurement temperature of asphalt, and has the temperature exceeds its maximum value when the automatic prompting function.
Hardware and asphalt temperature measurement using thermal resistance performance and price are good as a temperature sensor with stable voltage and current measuring temperature circuit signal; weight is calculated by measuring the flow; analog to digital converter using a MAXl97 analog to digital converter; display with LED digital tube dynamic display; super maximum prompt function via piezoelectric buzzer.
The design of the program uses the design method of the sub module, the software program uses the assembly language.. The main procedures are: the main program; sampling subroutine; calculation subroutine, delay subroutine, filter subroutine and display subroutine, etc.. At the same time, some anti-interference measures are adopted in the design of the software and hardware..
After the hardware analysis and software testing, the system can meet the requirements of the system, basically meet the requirements of the asphalt metering, and have a strong measurement function and a high value for use..
Keywords: asphalt; metering system; SCM; flow calculation; temperature sensor
第一章 绪论
1．1课题研究背景
传统的沥青计量是测量人员使用投尺法测量沥青液位高度，再根据液位高度值测量流量值，这种测量方法的缺点较多，一是测量精度不高，温度和密度的测量误差最终导致流量的测量误差；二是不够人性化，测量员在任何恶劣环境都要进行测量；三是不能实现随时随地测量；四是人为测量误差无法避免。因此，开发沥青连续自动计量系统显得非常重要。
在沥青公路施工过程中，也经常使用沥青。而在公路建造中使用的沥青是一种具有弹状，粘状和可塑性的流体性物质，在高温时融化呈液态，低温凝固变成固体，因此在沥青储存、加工、使用的各种过程中要对沥青流量进行测量，用常规的方法，比如流量计测量都是行不通的。目前各单位使用的测量方法大部分是地磅测量，这个测量方法有很多缺点：(1)必须通过多人合作测量，这样会降低工作效率，而且误差较大；(2)人为导致的测量误差无法避免；(3)由于沥青从车上搬运到地磅上比较麻烦，降低了工作效率；(4)在工作量较大的道路建造中，地磅测量也不方便。所以，沥青连续自动计量的问题影响着公路建造行业的发展，无法得到有效解决。本次设计就是开发一个测量精度高、运行成本低的沥青连续计量系统，应用于公路建造行业，对沥青流量现场连续计量。能实现测量精度高，运行成本低，使用方法简单，尽可能实现较好的测量效果。同时通过提高测量精度推动计量技术发展。 51单片机沥青连续计量系统程序设计(2):http://www.751com.cn/zidonghua/lunwen_21772.html