Control design and experimental verification of three-bed onboard oxygen generation system
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摘要:
为解决两床型机载制氧系统在实际应用过程中出现的输出压力波动大及低空氧浓度偏高等问题，需研制与开发三床型机载制氧系统。为此，依据系统控制逻辑，采用电磁阀驱动电控气动阀循环工作的控制模式，开展了三床型机载制氧系统的控制设计，提出了高低空分段调节循环周期的控制方法，并在不同输入压力、流量条件下，对三床型机载制氧系统进行了循环周期实验，探索了产品气氧浓度随循环周期时间的变化规律。研究结果表明：当采用高空循环周期为6 s，低空循环周期为9 s，高低空分段高度为3.5 km等控制参数时，系统控制设计可适用于三床型机载制氧系统，并满足三床型机载制氧系统控制设计的需求。
Abstract:Two-bed onboard oxygen generation system is facing the problem of large pressure fluctuation of output gas and high oxygen concentration at low altitude during the practical application process. In order to solve these problems, three-bed onboard oxygen generation system needs to be developed. According to the system control logic, the control mode that the electronic controlled pneumatic servo valve worked circularly was adopted. The control design of three-bed onboard oxygen generation system has been proposed. The control method of segmented regulation was proposed, in which different cycle time was applied depending on the altitude. Under different input pressure and flow conditions, the experiments of the three-bed onboard oxygen generation system were performed to investigate the influence of the cycle time on the oxygen concentration of product gas. The study results show that when the cycle time for low altitude and high altitude is determined to be 9 s and 6 s, respectively, and the segmented altitude is determined to be 3.5 km, the system control design is suitable for the three-bed onboard oxygen generation system, and meets the requirements for the control design of three-bed oxygen generation system.
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Key words:
- three-bed /
- onboard oxygen generation system /
- system control /
- cycle period /
- experiment
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图 3 氧浓度允许范围随座舱高度的变化
Figure 3. Variation of allowable oxygen concentration range with cabin height
图 4 机载制氧系统的实验装置原理图
Figure 4. Schematic of experimental equipment for onboard oxygen generation system
图 5 输入压力为0.2 MPa、输出流量为30 L/min条件下产品气输出压力与飞行高度的关系
Figure 5. Relationship between product gas output pressure and flight height under condition of input pressure of 0.2 MPa and output flow of 30 L/min
图 6 不同温度条件下产品气氧浓度与循环周期的关系
Figure 6. Relationship between product oxygen concentration and cycle period under different temperature conditions
图 7 高度为0 km条件下产品气氧浓度与环境温度的关系
Figure 7. Relationship between product gas oxygen concentration and ambient temperature at height of 0 km
图 8 不同输出流量条件下产品气氧浓度与座舱高度的关系
Figure 8. Relationship between product gas oxygen concentration and cabin height under different output flow conditions
图 9 高度信号调节循环周期条件下产品气氧浓度与座舱高度的关系
Figure 9. Relationship between product gas oxygen concentration and cabin height under high signal regulation cycle period
表 1 主要实验仪器
Table 1. Main experimental instruments
仪器名称 量程 精度等级 备注 测氧仪 0~100% ±2% 压力表1 0~1 MPa 1.6级 压力表2 0~1 MPa 0.6级 浮子流量计 0~100 L/min 2.5级 高度表 0~20 km 直流稳压电源 0~32 V/0~10 A 高度监控仪 0~20 km 高温箱 室温~80℃ ±2℃ 低温箱 -60~0℃ ±2℃ 真空泵 101.3 kPa~1.3 Pa 空压机 0.975 MPa 高空舱 0~20 km 
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