The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1988
Filed:
Jul. 20, 1987
Raymond H Horstman, Auburn, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
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.