# US 2009/0260631 A1 · Respiratory gas supply circuit for an aircraft carrying passengers

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- Number: US 2009/0260631 A1
- Document ID: US20090260631A1
- Status: Published application
- Kind: A1
- Application number: 12/296,935
- Filed: 2006-04-13
- Published: 2009-10-22
- Earliest claimed: 2006-04-13
- Assignees: Intertechnique
- Inventors: Severine Aubonnet; Vincent Greter
- Web page: https://patentgrep.com/patent/US20090260631A1

## CPC

- A62B 7/02: with compressed oxygen or air
- A62B 7/14: for high-altitude aircraft
- A62B 9/02: Valves {(non-return valves mounted in breathing masks or helmets A62B18/10)}
- A62B 18/02: Masks (gas-masks for animals A62B18/06; masks for welders A61F9/06)
- B64D 10/00: Flight suits
- B64D 2231/02: Supply or distribution systems
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT

## Abstract

The invention relates to a respiratory gas supply circuit for an aircraft carrying passengers, comprising a pressurized source of respiratory gas (R1, R2) and a supply line (2, 3), said circuit further comprising on said supply line a regulating device (12, 30) for controlling the supply in respiratory gas to said passengers, wherein said regulating device further comprises an electro-valve (12) controlled by a pulse width modulation signal provided by an electronic unit (20).

## Claims

### Claim 1

A respiratory gas supply circuit for an aircraft carrying passengers, comprising a pressurized source of breathable gas and a supply line, said circuit further comprising on said supply line a regulating device for controlling the supply in breathable gas to a plurality of respiratory masks for said passengers,
wherein said regulating device further comprises an electro-valve controlled by a pulse width modulation signal provided by an electronic unit.

### Claim 2 (depends on 1)

A circuit according to claim 1, wherein the electro-valve is a solenoid valve.

### Claim 3 (depends on 1)

A circuit according to claim 1, wherein the solenoid valve is a two position on/off solenoid valve, with a variable duty ratio.

### Claim 4 (depends on 1)

A circuit according to claim 1, further comprising a first pressure sensor provided in the cabin of the aircraft, to supply a first pressure signal to the electronic unit for elaborating a set point to control the electro-valve.

### Claim 5 (depends on 1)

A circuit according to claim 1, wherein a second pressure sensor is provided on the supply line downstream the regulating device, to supply a second pressure signal to the electronic unit corresponding to the regulated pressure.

### Claim 6 (depends on 4)

A circuit according to claim 4, wherein the electronic unit compares the set point to the regulated pressure to elaborate the pulse width modulation signal.

### Claim 7 (depends on 6)

A circuit according to claim 6, wherein the electronic device comprises a PID module to elaborate the pulse width modulation signal.

### Claim 8 (depends on 3)

A circuit according to claim 3, wherein the electro-valve is provided on the supply line to either switch on or off the supply in breathable gas in response to the pulse width modulation signal provided by the electronic unit.

### Claim 9 (depends on 3)

A circuit according to claim 3, wherein the inlet of the solenoid valve is connected to the pressurized source of respiratory gas, said circuit further comprising a piston movable between a first position wherein the supply line is open and a second position wherein the supply line is closed, said piston being movable in response to the outlet pressure of the two position on/off solenoid valve.