Phase dilution demand oxygen regulator (pddor) system for personal breathing

A breathing system incorporating a phased-dilution demand oxygen regulator, comprising:

• at least one pressurized oxygen source;
• a breathing mask worn by a user and configured to cover a nose and a mouth of the user, the breathing mask coupled to the pressurized oxygen source by at least one supply line;
• a dilution valve coupled to the supply line, the dilution valve configured to provide a supply of ambient air to the breathing mask when open;
• a demand valve coupled to the at least one oxygen source via the supply line;
• and
• a breathing regulator coupled to the at least one supply line and to the at least one oxygen source, the breathing regulator associated with a control volume (CV) pressure therewithin and comprising at least one main valve, the breathing regulator configured to:
• 1) receive at least one pressure signal from the breathing mask, the pressure signal corresponding to a) a start of an inhalation cycle, b) an initial demand phase of the inhalation cycle, and c) an opening of the demand valve;
• 2) provide a pure oxygen supply to the breathing mask via the open demand valve throughout the initial demand phase;
• 3) when the CV pressure deceeds the lower threshold pressure, cutting off the pure oxygen supply by closing the main valve;
• and
• 4) when the main valve closes, provide the ambient air supply to the breathing mask via the dilution valve.