在模式识别下的萃取液温度控制方法研究  

Solut ion Temperature Control Method Based on Pattern Recognition

作　　者：金燕华[1] 秦开宇[1] 白泰礼[1] 

机构地区：[1]电子科技大学空天科学技术研究院,成都610054

出　　处：《电子科技大学学报》2009年第3期376-379,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60672029)

摘　　要：离子污染测试仪是用于对清洗后PCB板残存的离子污染物含量进行测试的仪器。由于萃取液温度直接影响离子污染物的溶解程度,因而需通过精确控制萃取液温度的方式来保证更高级别的污染物被检测到。在工程应用中,采用常规PID控制方法难以达到要求的控制精度。该文提出了一种基于模式识别的萃取液温度智能控制方法,通过对系统动态特征的模式分类,结合专家经验在线自动调整控制规律,使系统保持预定的温度。仿真研究表明,该方法与传统PID控制方法相比,具有更好的控制效果和更强的鲁棒性。实际应用时超调量小于0.5℃,控制精度可达±0.2℃,满足系统设计要求。Ionic contamination （IC） tester is used to test the IC content retained on the cleaned printed circuit board （PCB） surface. Because the solution temperature has direct effect on the level of IC, a high rate of IC test should be ensured by precise control of solution temperature. In practice, however, it is very difficult to control temperature precisely via the traditional PID control methods. An intelligent PID control method for the solution temperature based on pattern recognition is proposed in this paper. With the identified pattern parameters and expert experience, the PID control rules can be adaptively adjusted on line, and the temperature can be kept on its predetermined values. The simulation results show the proposed method has more excellent performance and robustness than conventional PID controllers. The practical control precision can be achieved to ±0.2°C and the overshoot can be less than 0.5°C in the application of ionic contamination testor, which can meet the engineering requirement.

关 键 词：智能控制 离子污染测试 模式识别 温度控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TP391.4[自动化与计算机技术—控制科学与工程]