基于死区补偿的氧调器平稳切换自抗扰控制

Smooth-switching active disturbance rejection control for oxygen regulator based on dead-zone compensation

歼击机中供氧系统内的氧气气压调节系统(氧调器系统)对飞行员的飞行质量至关重要。但是氧调器系统易受飞行环境和飞行员呼吸状态等因素的影响,而且氧调器所用阀门大多含有死区,会给控制系统带来稳态误差,导致控制难度增大,一般的控制策略难以兼顾补偿较大死区和抗扰两个条件。针对此问题,建立了基于音圈电机驱动阀的氧调器系统模型,并针对模型死区特性采用了死区补偿和双限幅模块,设计了基于死区补偿的平稳切换自抗扰控制策略。仿真及对比结果表明:采用同一套控制参数,可以使氧气面罩内压强在各个呼吸频率时有效,并快速地控制在呼吸阻力容许界限以内;并且其呼吸阻力低于将死区看作扰动的一般自抗扰控制(ADRC)。同时,验证了此策略的鲁棒性和抗扰性。

The oxygen pressure regulator system （oxygen regulator system） for fighter aircraft is essential to pilot＇s flying qualities. However, the oxygen regulator system is susceptible to the factors such as flight environment and breathing state of pilots, and most valves of the oxygen regulator have dead-zone, which causes steady-state error of the control system and makes control more difficult. Conventional control strategy cannot compensate the big dead-zone and resist disturbance ei- ther. To solve this problem, this paper develops an oxygen regulator model based on the valve driven by the voice coil mo- tor. In consideration of the dead-zone characteristics of the model, the dead-zone compensation and double-limiting module are adopted to design the smooth-switching active disturbance rejection control （ADRC） strategy based on the feed-forward compensation. The simulation and comparison results demonstrate that by using the same set of control parameters, the respiratory pressure in the oxygen mask can be effectively and rapidly controlled within the allowable limits of respiratory resistance at various respiratory frequencies, and the breathing resistance is lower than the general ADRC which considers the dead-zone as disturbance. The robustness and immunity of the strategy are verified.