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Application of Fuzzy PID in Differential Pressure Control of Dryer Inlet and Outlet of Tissue Paper Machine
  
DOI：10.11980/j.issn.0254-508X.2017.11.009
Key Words:fuzzy PID  adjustable heat pump  differential pressure in dryer inlet and outlet
Fund Project:陕西省重点科技创新团队计划项目（2014KCT-15）；陕西省科技统筹创新工程计划项目（2016KTCQ01-35）。
Author NameAffiliation
汤　伟1 1.陕西科技大学电气与信息工程学院，陕西西安,710021 
孙小乐2，* 2.陕西科技大学机电工程学院，陕西西安,710021 
佘　都1 1.陕西科技大学电气与信息工程学院，陕西西安,710021 
杨润珊1 1.陕西科技大学电气与信息工程学院，陕西西安,710021 
袁志敏1 1.陕西科技大学电气与信息工程学院，陕西西安,710021 
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Abstract:The differential pressure of dryer inlet and outlet which isusually in a fluctuating state, is an important parameter indicating whether the dryer has accumulated water, Generally, the control strategy is use PID control algorithm to keep it in a specific value. The nonuniform drainage of the dryer results the differential pressure of dryer inlet and outlet in a normal fluctuation state, so the control purpose is difficult to achieve. In this paper, a new method to control the differential pressure of dryer inlet and outlet was proposed, in which “fuzzy” theory was applied to divide the differential pressure into five ranges and to adjust PID controller parameters for controlling the heat pump opening of the Yanke dryer, keeping the differential pressure of dryer inlet and outlet in a suitable range. Simulation and application showed that the heat pump opening changed smoothly, the differential pressure of dryer inlet and outlet was controlled within a certain range that ensured the dryer could maintain a state．
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