基于嵌入式Linux的模拟泄漏控制系统设计  

Analog leakage control system based on embedded Linux

作　　者：熊四昌[1] 毛国宾 唐浩然[1] XIONG Si-chang;MAO Guo-lain;TANG Hao-ran(The Ministry of Education Key Lab of Mechanical Manufacture ＆ Automation,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学特种装备制造与先进加工技术教育部重点实验室,浙江杭州310014

出　　处：《机电工程》2018年第8期823-827,847,共6页Journal of Mechanical & Electrical Engineering

基　　金：浙江省科技计划资助项目(2008C21146)

摘　　要：针对在标定气体泄漏检测设备的检测精度时,传统标定平台存在操作过程繁琐、测量误差大和便携性差等问题,研究分析了模拟泄漏的原理,建立了模拟泄漏率与步进电机转速之间的关系,设计了一种基于嵌入式Linux的模拟泄漏控制系统。根据系统的功能需要设计了系统的硬件电路,并基于Linux+Qt的开发环境设计了系统的控制程序和人机交互界面;通过对S3C2440定时器TOUT0端口的PWM脉宽调制,准确控制了步进电机的转速;同时采用S3C2440的外部中断EINT0准确统计了光电编码器发出的脉冲数,实时得到了实测模拟泄漏率,并对其误差和实时稳定性进行了实验分析。实验结果表明:该系统达到了标定气体泄漏检测设备时对模拟泄漏精度和稳定性的要求,可为气体泄漏检测设备提供方便可靠的标定平台。Aiming at calibrating the detection accuracy of gas leak detection equipment,the traditional calibration platform has the problem of complicated process,large measurement error and poor portability,the principle of simulation leakage was studied and analyzed,and the relationship between simulated leakage rate and speed of stepper motor was established,a kind of leakage control system simulation based on embedded Linux was designed. The hardware circuit of the system was designed around the function of the system,and the control program and man-machine interaction interface based on the development environment of Linux ＋ Qt was designed. Through the pulse width modulation on the TOUT0 port of S3 C2440,the stepper motor speed was controlled accurately,and used the external interrupt EINT0 of S3 C2440 count the number of pulse from photoelectric encoder accurately,real-time obtained the measured simulation leakage rate,and its error and stability were analyzed. The experimental results show that the system meets the requirements of simulation leakage accuracy and stability when calibrating gas leak detection equipment,and provides a convenient and reliable calibration platform for gas leak detection equipment.

关 键 词：步进电机 嵌入式Linux+Qt PWM脉宽调制 模拟泄漏 

分 类 号：TH863[机械工程—仪器科学与技术] TP24[机械工程—精密仪器及机械]