The Application of Disturbance-Observer-Based Control in Breath Pressure Control of Aviation Electronic Oxygen Regulator

Rui Pan,Yu Zeng,Guiping Lin,Xue Yang,Zhigao Shi

doi:10.3390/en14165189

Rui Pan, Yu Zeng + Show 3 more

Open Access

https://doi.org/10.3390/en14165189

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Journal: Energies	Publication Date: Aug 22, 2021
Citations: 6	License type: CC BY 4.0

Affiliation: Beihang University, Craft Group (China)

Abstract

The electronic oxygen regulator (EOR) is a new type of aviation oxygen equipment which uses electronic servo control technology to control breathing gas pressure. In this paper, the control method of EOR was studied, and the dynamic model of the aviation oxygen system was established. A disturbance-observer-based controller (DOBC) was designed by the backstepping method to achieve the goal of stable and fast breath pressure control. The sensitivity function was proposed to describe the effect of inspiratory flow on breath pressure. Combined with the frequency domain analysis of the input sensitivity function, the parameters of the DOBC were analyzed and designed. Simulation and experiment studies were carried out to examine the control performance of DOBC in respiratory resistance and positive pressurization process under the influence of noise and time delay in the discrete electronic control system, which could meet the aviation physiology requirements. The research results not only verified the rationality of the application of DOBC in the breath control of EOR, but also proved the effectiveness of the control parameters design method according to the frequency domain analysis, which provided an important design basis for the subsequent study of EOR.

Highlights

Accepted: 21 August 2021Fighter pilots need to be equipped with an aviation oxygen system to avoid the damage caused by low air pressure and oxygen deprivation at high altitude
The difficulties in breath pressure control were analyzed in references [3,6,11]. Based on these studies and the particularity of pilot breath process, we summarize the following three points about breath pressure control
It can be seen from the phase-frequency characteristic diathe state feedback gain k1 was calculated as 133, and disturbance observer coefficient was gram of Bode Diagram that the phase lag is between 80° and 90° at each calculated as 8883

Summary

Introduction

Accepted: 21 August 2021Fighter pilots need to be equipped with an aviation oxygen system to avoid the damage caused by low air pressure and oxygen deprivation at high altitude. Oxygen regulator is the core component, and its main function is to control the oxygen supply pressure to meet the physiological and protective requirements. Physiological requirement refers to supplying oxygen according to the pilot’s breathing demand to reduce respiratory resistance and improve breathing comfort. Protective requirement refers to pressurizing the supply oxygen to prevent pilot from the harsh environment [4,5]. The mechanical oxygen regulator is the traditional type of oxygen regulator, which uses diaphragms for breath control [6]. With the development of microelectronic control technology, the concept of electronic oxygen regulator using sensor and motor was proposed to simplify the structure, improve the pilot’s breathing comfort, and provide monitoring capabilities [7].

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Results

Conclusion