%0 Journal Article
%T A Fuzzy Logic Based Supervisory Hierarchical Control Scheme for Real Time Pressure Control
%A N Kanagaraj
%A P Sivashanmugam
%A S Paramasivam
%A <br>
%J 国际自动化与计算杂志
%D 2009
%I 
%X This paper describes a supervisory hierarchical fuzzy controller (SHFC) for regulating pressure in a real-time pilot pressure control system. The input scaling factor tuning of a direct expert controller is made using the error and process input parameters in a closed loop system in order to obtain better controller performance for set-point change and load disturbances. This on-line tuning method reduces operator involvement and enhances the controller performance to a wide operating range. The hierarchical control scheme consists of an intelligent upper level supervisory fuzzy controller and a lower level direct fuzzy controller. The upper level controller provides a mechanism to the main goal of the system and the lower level controller delivers the solutions to a particular situation. The control algorithm for the proposed scheme has been developed and tested using an ARM7 microcontroller-based embedded target board for a nonlinear pressure process having dead time. To demonstrate the effectiveness, the results of the proposed hierarchical controller, fuzzy controller and conventional proportional-integral (PI) controller are analyzed. The results prove that the SHFC performance is better in terms of stability and robustness than the conventional control methods.
%K Pressure control
%K supervisory hierarchical fuzzy controller (SHFC)
%K fuzzy controller
%K ARM7 processor
%K embedded controller<br>压强控制
%K 分等级管理
%K 模糊控制
%K ARM7处理器
%K 嵌入式控制
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7139AD613512F4F05F6D525B914296AA&aid=8D2898D92BD567576CD4FB805D0989DB&yid=DE12191FBD62783C&vid=B31275AF3241DB2D&iid=CA4FD0336C81A37A&sid=7E8E8B150580E4AB&eid=6700D0D256586E73&journal_id=1476-8186&journal_name=国际自动化与计算杂志&referenced_num=2&reference_num=28