燃烧加热器气动阀门阀后压力的模糊控制

The fuzzy control of pressure after the air-driven valve in combustion heater

燃烧加热器是超燃冲压发动机研究的主要试验设备。试验气体包括氢气、氧气、空气和氮气等,需要调节控制的参数为试验气体的压力、流量。根据燃烧加热器的控制需求,设计了一套以工业控制计算机为核心的实用并且兼顾可靠性要求的控制系统。采用自适应Fuzzy-PI的控制方法对试验气体压力进行压力控制,在常规PI控制器的基础上,对控制器的比例系数Kp和积分系数Ki进行在线调整,使控制器既满足响应快、超调小、稳定时间短的要求,又提高稳态控制精度,取得了较好的控制效果。

The combustion heater is a key part of the ground testing facility for the research on scram jet. The main test gases ingredients include hydrogen, oxygen, air and nitrogen. The pressure and flow of these test gases ingredients need to be regulated during testing, and the pressure is controlled directly by the air-driven valve. A control system with a industrial control computer as it＇s central part is designed, and a good balance between the reliability and the practicality of the system can be achieved. According to the characteristics of the air-controlled valve, a kind of adaptive Fuzzy-PI controller is designed to realize the fine pressure control during test. It is realized by connecting the conventional PI controller with a parameter regulator which adjust the integrator and proportion parameter of the PI controller through fuzzy inference during test. It has improved the pressure control precision with some good qualities such as quick response, less over-regulating and less stabilizin~ time.