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US 4,553,474 AGranted
Aircraft cabin pressurization system
AssigneeThe Garrett Corporation
InventorsPaul P. Wong, John B. Lippold, Glenn A. Burgess
Life of this patent
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Abstract
This invention controls the air pressure in an aircraft cabin in response to a selected landing field altitude and to a selected maximum permissible cabin pressure rate.
Claims29
A system for controlling cabin pressurization in an aircraft cabin, comprising:
- first means for providing a cabin altitude signal indicative of the air pressure in said aircraft cabin;
- second means for providing a cabin altitude rate change signal indicative of the actual rate of change of air pressure in said aircraft cabin;
- third means for providing an aircraft altitude signal indicative of the ambient air pressure on the exterior of the aircraft, and hence the altitude of the aircraft;
- autoschedule means for calculating a commanded rate of change of air pressure in said aircraft cabin in response to aircraft altitude;
- means for controlling the air pressure in said aircraft cabin in response to said cabin altitude signal and said commanded rate of change;
- and
- clamp control means for maintaining a constant pressure situation in said aircraft cabin, said constant pressure situation being initiated when the change of said aircraft altitude signal over a preset time period is less than a first predetermined value, said constant pressure situation being maintained until said aircraft altitude signal changes by a second predetermined value from the value of said aircraft altitude signal at the time said constant pressure situation was initiated.
4 more elements
A method for controlling air pressure in an aircraft cabin, comprising:
- sensing air pressure in said aircraft cabin;
- generating a signal indicative of the actual rate of change of air pressure in said aircraft cabin;
- measuring ambient pressure on the exterior of the aircraft to provide an indication of the altitude of said aircraft;
- calculating a commanded rate of change of air pressure in said aircraft cabin in response to aircraft altitude;
- controlling the air pressure in said aircraft cabin in response to said cabin altitude signal and said commanded rate of change;
- initiating a constant pressure situation in said aircraft cabin when aircraft altitude varies by less than a first predetermined values over a preset time period;
- and
- maintaining air pressure in said aircraft cabin constant during said constant pressure situation by clamping said air pressure in said aircraft cabin to a constant value.
5 more elements
Dependencies are inferred from the claim text.