Control Strategy and Simulation for Oxygen Supply System with Wearable Oxygen Mask

Wearable oxygen masks play an important role in many fields such as traffic, aviation, medical and health, which is a device worn on the human head. An oxygen supply system (OSS) with a wearable mask is even more essential in aeronautical medicine to ensure the safety of pilots. Because of the complexity of the flight environment, having good control performance for pressure regulation is the key to realize the adaptability of oxygen supply equipment. Based on the application of wearable oxygen mask, an OSS with wearable mask is introduced. A mathematical model of OSS with a voice coil motor drive valve is provided. The improved active disturbance rejection control (ADRC) strategy with feed-forward and two limits is applied to the system according to the dead-zone characteristics of this OSS. The platform is built and mathematical simulations are carried out for the control strategy, comparing with the proportional integral derivative (PID) control algorithm with feed-forward. The results demonstrate that the differential pressure between the mask and the outside can be within ideal boundaries through both improved ADRC and improved PID. And the improved ADRC has better control effect. Meanwhile it can be resistant to disturbances and the changing breathing frequency.