沥青软化点检测系统及其线性升温控制  

Asphalt Softening Point Detection System and Its Linear Temperature Control

作　　者：邵秋萍[1] 陆俊[1] 赵相宰[1] 徐东东[1] 

机构地区：[1]南京工程学院,江苏南京211167

出　　处：《机电产品开发与创新》2012年第6期128-130,共3页Development & Innovation of Machinery & Electrical Products

基　　金：南京工程学院大学生科技创新基金项目资助(N20120101)

摘　　要：沥青软化点检测系统以AT89C52为核心,通过DS18B20温度传感器、MOC3061光耦可控硅及光电检测开关来实现温度的检测、加热管的通断及沥青软化的测试。系统包括加热回路、检测回路、显示回路及其它辅助回路等模块。在加热过程中必须按照每分钟5±0.5℃的速度进行升温。一般的温控方法存在加热滞后、惯性大、温度曲线线性差等不足。为使测试过程符合国家标准,采用改进的PID算法,对输出控制进行调整。通过控制周期内的加热及停止时间来控制加热过程,使加热介质的温度变化达到线性升温的要求。Asphalt softening point testing system based on AT89C52, through the DS18B20 temperature sensor and MOC3061 optical cou- pling SCR and photoelectric detection switches to achieve detection of temperature, heater-pass and breaking and test of asphalt softening. The system includes a heating circuit, detection circuit, display circuit and auxiliary circuit module. During the heating process must be in ac- cordance with each minute 5＋0.5~Cspeed temperature. General control method in the presence of heating lag, big inertia, temperature curve linearity poor. In order to make the test process according to the national standard, the improved PID algorithm, the output control adjust- ment. By controlling the heating cycle and to stop time to control the heating process, so that the temperature of the heating medium changes to linear temperature requirements.

关 键 词：线性升温 沥青软化点 PID调节 温度检测 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]