This disclosure describes an on-board oxygen generating system (OBOGS) using open loop control. An example OBOGS includes a concentrator comprising at least two beds and a controller. Each bed has a valve to pneumatically couple the bed between a supply gas source and a vent; The controller receives at least one input signal from at least one sensor aboard an aircraft, and determines a predicted oxygen concentration output from the at least two beds into the based on the received input signals. The controller controls the valves of the at least two beds based on the determined predicted oxygen concentration to adjust charge/vent ratios of the at least two beds.

Methods, apparatuses, and systems for mechanically releasing a predetermined amount of supplemental oxygen to a user via a mechanical initiator are disclosed with the release of the amount of supplemental oxygen based on and in response to the combined factors of a user's determined oxygen consumption based on sensing a user's inhalation combined with determining the ambient pressure in the area of the user.

The germ protection system for vehicles, hospitals, restaurants, schools, nursing homes, lifts and the like uses: a) A system that prevents germs: bacteria, protozoa, viruses or parasites from being breathed in vehicles or closed premises, lifts or the like, blowing or sucking air, b) An independent air installation that applies air conditioning, fed with turbofan engines, to the individual air blowing nozzles in the ceiling or backrest of the compartments of each passenger, c) An independent air installation using compressors that extracts and compresses the outside air, and apply it to the individual air blowing nozzles in the ceiling or backrest of the compartments of each passenger, d) A system that uses an individual installation to replace oxygen system in case of emergency, e) A system that is valid simultaneously for protection against germs and for breathing in case of emergency. The air is filtered, disinfected, its pressure, temperature and humidity regulated, and through some ducts it is applied to the masks, helmets, hoods, their ducts or nasal cannulas. f), A system that is coupled to the individual air supply nozzle of the passengers, using for this purpose at the end of the duct of the mask, face mask screen, diving suit or helmet.

A system is disclosed for aircraft life support and generating inert gas. The system includes an electrochemical cell with a cathode and an anode separated by a proton transfer medium. A cathode supply fluid flow path is between an air source and a cathode fluid flow path inlet, and an inerting gas flow path is in operative fluid communication with a cathode fluid flow path outlet and a protected space. An anode supply fluid flow path is between a water source and an anode fluid flow path inlet, and an oxygen gas flow path is in operative fluid communication with an anode fluid flow path outlet and an aircraft occupant breathing device. An electrical connection is between a power source and the electrochemical cell.

Redundant electrochemical systems and methods for vehicles are described. The systems include a first electrochemical device located at a first position on the vehicle wherein the first electrochemical device is configured to generate at least one of inert gas, oxygen, and electrical power and a second electrochemical device located at a second position on the vehicle wherein the second electrochemical device is configured to generate at least one of inert gas, oxygen, and electrical power. The first electrochemical device is configured to operate in a first mode during normal operation of the vehicle and a second mode when the second electrochemical device fails, wherein in the second mode, the first electrochemical device provides the at least one of inert gas, oxygen, and electrical power for at least one vehicle critical system of the vehicle.

Aircrafts and methods for reusing oxygen enriched air. In one embodiment, an aircraft includes an oxygen supply subsystem configured to supply oxygen to a cabin of the aircraft, and an air separator configured to receive a pressurized air stream, to separate the pressurized air stream into oxygen enriched air and an inert gas, and to feed the oxygen enriched air to the oxygen supply subsystem.

An apparatus, systems comprising the apparatus, and methods of using and making the apparatus are disclosed, with the apparatus comprising an inlet, at least one oxygen membrane separator in communication with the inlet and in communication with an ambient airflow, with the ambient airflow comprising an ambient oxygen concentration, at least one piezoelectric pump in communication with the at least one oxygen membrane separator, and an outlet for emitting an enhanced oxygen concentration airflow.

An oxygen generator outlet manifold assembly that includes an outlet manifold and an end cover. The outlet manifold includes a main body portion with inner and outer surfaces and at least a first hose connector that includes an outlet defined therein extending from the main body portion. The main body portion defines a main body portion interior that includes a connection opening defined in the inner surface, a ring chamber, a flow space and a distribution chamber. An annular ring is positioned in the main body portion chamber interior and separates the ring chamber from the distribution chamber. The end cover includes a generator outlet portion extending therefrom that is received in the connection opening. The generator outlet portion includes an outlet valve having an open and a closed state and includes an interior chamber that cooperates with the ring chamber to define an outlet chamber. An oxygen flow path is defined through the open valve, to the outlet chamber, through the flow space, through the distribution chamber and to the outlet of the first hose connector.

A gas-leak management system including a primary duct; and a leak-management duct, at least a portion of the leak-management duct surrounding at least a portion of the primary duct, wherein the leak-management duct includes a gap between the portion of the primary duct and the portion of the leak-management duct, and including one or more vent holes in fluid communication with the gap.

A vehicle oxygen indication system that includes at least one oxygen source, and a plurality of oxygen assemblies. Each oxygen assembly includes a hose, a switch, a mask, and a flow indicator. The hose includes a lumen through which oxygen can flow from the oxygen source to the mask. The switch is switchable between a normal state when oxygen is not flowing from the oxygen source to the mask and a flow state where oxygen flows to the mask. When the switch is in the flow state, the flow indicator is switched from a static state to an indication state.