Electronically compensated pressure dilution demand regulator

摘要

The present invention relates to a dilution control oxygen regulator for providing a desired oxygen concentration at different altitudes and pressures. Two valves supply oxygen and air to a recipient's mask. A pressure transducer in the mask measures suction pressure which is compared with a prescribed pressure command signal for a particular altitude to produce a pressure error. The error signal is compensated by a proportional-plus-integral controller, and is biased between the two gas valves proportional to an oxygen concentration schedule which prescribes a desired oxygen concentration percentage based on altitude. The biased and compensated error signal is used as valve opening displacement commands for establishing desired valve opening areas. A feedback loop around the electromechanical valve actuator means improves the stability and accuracy of valve settings.