| US 7,462,098 B2 | ||
| Cabin pressure control system and method that accommodates aircraft take-off with and without a cabin pressurization source | ||
| Timothy R. Arthurs, Tucson, Ariz. (US); Darrell W. Horner, Oro Valley, Ariz. (US); Alastair R. Laing, Tucson, Ariz. (US); and Joaquin P. Rabon, Tucson, Ariz. (US) | ||
| Assigned to Honeywell International, Inc., Morristown, N.J. (US) | ||
| Filed on Mar. 16, 2005, as Appl. No. 11/82,753. | ||
| Prior Publication US 2006/0211359 A1, Sep. 21, 2006 | ||
| Int. Cl. B64D 13/02 (2006.01); G05D 1/08 (2006.01) | ||
| U.S. Cl. 454—74 [244/180] | 7 Claims |
| 1. In an aircraft having a source of cabin pressurizing fluid for pressurizing an aircraft cabin, a computer readable medium
for setting a target cabin altitude in the aircraft cabin during and after aircraft take-off from a take-off altitude, comprising:
program code for determining whether the cabin pressurizing fluid is flowing into the aircraft cabin;
program code for setting the target cabin altitude to (i) at least a first predetermined minimum altitude value below the
take-off altitude if the cabin pressurizing fluid is flowing into the aircraft cabin or (ii) at least a second predetermined
minimum altitude value above the take-off altitude if the cabin pressurizing fluid is not flowing into the aircraft cabin;
and
program code for determining a landing field altitude value, the landing field altitude value corresponding to an altitude
of a landing destination of the aircraft;
program code for determining actual aircraft altitude;
program code for determining a scheduled cabin altitude value based on the determined actual aircraft altitude;
program code for comparing the landing field altitude value to the first predetermined minimum value to determine which is
larger in value;
program code for comparing the larger of the landing field altitude value and the first predetermined minimum altitude value
to the scheduled cabin altitude value to determine which is largest in value; and
if the cabin pressurizing fluid is flowing into the aircraft cabin, program code for controlling air flow through an outflow
valve to set the target cabin altitude to the altitude value that is largest in value,
wherein the target cabin altitude corresponds to a desired cabin altitude.
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