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Method and apparatus for controlling the concentration of carbon dioxide in an aircraft cabin
| Details |
Inventors: Horstman, Raymond H.;
Assignee: The Boeing Company (Seattle, WA)
Primary Examiner: Joyce; Harold
Assistant Examiner:
Attorney, Agent or Firm: Christensen, O'Connor, Johnson & Kindness
A control and method for maintaining the concentration of carbon dioxide in the cabin (11) of an aircraft at a desired level. A carbon dioxide sensor (40, 41) is disposed to monitor the concentration of carbon dioxide in the cabin of the aircraft. Air drawn from the cabin at locations (24, 25) where the concentration of carbon dioxide is relatively higher than at other locations (31, 32) is selectively vented overboard or recirculated in response to the concentration of carbon dioxide in the cabin. As more air is vented overboard to maintain the cabin at a desired level of carbon dioxide concentration, an air pack compensates by supplying additional pressurized fresh air to the cabin. Should the cabin pressure drop below a minimum set point limit, the control causes less air to be vented overboard, irrespective of the carbon dioxide concentration. In another embodiment, cabin pressure is controlled between predetermined limits, and so long as the pressure remains between those limits, additional pressurized fresh air is provided if the level of carbon dioxide increases beyond a predetermined limit. |
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DETAILED DESCRIPTION The present invention is used in a system that maintains a pressurized enclosed space (e.
g.
, an aircraft cabin) at a desired air pressure.
Included in the system are means for recirculating back into the enclosed space air drawn from a plurality of locations, and means for supplying pressurized air that is a mixture of fresh air and recirculated air to the enclosed space to maintain it at a desired pressure.
The invention is an apparatus and method for selectively recirculating or venting air drawn from one or more locations in the enclosed space where the air is relatively higher in carbon dioxide concentration than air drawn from one or more other locations.
The apparatus includes means for sensing carbon dioxide and producing a signal indicative of the concentration thereof in the enclosed space.
Connected to receive the signal and responsive to it are, in one embodiment, means for controlling the volume of air drawn from the one or more locations where the air is relatively higher in carbon dioxide concentration, that is vented from the space rather than recirculated, as a function of the concentration of carbon dioxide in the space.
As more air from the one or more locations having a relatively higher concentration of carbon dioxide is vented, the means for supplying pressurized air respond by supplying relatively more fresh pressurized air to maintain the enclosed space at a desired pressure.
However, should the pressure in the space fall below a preset level, the means for venting air that is relatively higher in concentration of carbon dioxide are operative to vent less air from the space, irrespective of the carbon dioxide concentration.
In another embodiment, the volume of pressurized fresh air supplied to the space is increased if the concentration of carbon dioxide exceeds a predetermined level.
However, pressure control means give priority to the maintenance of cabin pressure, irrespective of the concentration of carbon dioxide.
It will be apparent that the present invention operates to automatically maintain the enclosed space at a desired air pressure while at the same time maintaining the concentration of carbon dioxide in the space at an acceptable level
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