초록 ▼

A control device for molecular sieve on-board oxygen generating systems measures both temperature and pressure of the inlet air of an oxygen generating system. An electronic control unit applies pressure limits to a pressure measurement signal and combines it with a temperature measurement signal to

A control device for molecular sieve on-board oxygen generating systems measures both temperature and pressure of the inlet air of an oxygen generating system. An electronic control unit applies pressure limits to a pressure measurement signal and combines it with a temperature measurement signal to produce a composite analog signal responsive to both temperature and pressure inlet air conditions. This analog signal is linearly converted to a frequency signal, whereupon the frequency signal is divided by a constant in order to produce a drive signal for control of the absorb/vent bed cycle valves. Composition control is achieved by venting product mixture as required. Inlet air pressures down to 5 PSIG (pounds per square inch gauge) produce correct system operation, and the quantity of conditioned air required is automatically limited so that system efficiency is higher than prior art systems.

대표청구항 ▼

[ It is claimed:] [1.] An apparatus for supplying a breathable gas mixture to aircraft crew members from an air source, comprising:first and second adsorption beds, each bed having an inlet for admitting a gas mixture and an outlet for discharging product gas;a valve assembly for selectively admitti

[ It is claimed:] [1.] An apparatus for supplying a breathable gas mixture to aircraft crew members from an air source, comprising:first and second adsorption beds, each bed having an inlet for admitting a gas mixture and an outlet for discharging product gas;a valve assembly for selectively admitting the gas mixture to one of said inlet of said first and second beds and for selectively exhausting the discharged product gas from one of said beds through said outlet of said first and second beds;a pressure reducer for supplying the gas mixture at a pressure between 5 psig and 18 psig to said valve assembly;an inlet supply pressure sensor in fluid communication with said valve assembly for sensing the pressure of the gas mixture supplied thereto and for providing a signal indicator thereof;an inlet supply temperature sensor in fluid communication with said valve assembly for sensing the temperature of the gas mixture supplied thereto and for providing a signal indicative thereof;a controller which receives said pressure signal and said temperature signal and based upon said pressure and temperature signals determines intervals for adsorption by said first and second beds and for actuating said valve assembly for cycling said first and second beds between operating conditions where the gas mixture has been admitted to one of said first and second beds and is being adsorbed and regenerating conditions where the discharged product gas is being exhausted, to optimize the production of product gas for the sensed inlet air conditions.