Aircraft cabin pressurization system
First Claim
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1. 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.
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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.
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Citations
29 Claims
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1. A system for controlling cabin pressurization in an aircraft cabin, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for controlling air pressure in an aircraft cabin, comprising:
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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. - View Dependent Claims (27, 28, 29)
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Specification