Ventilation – Vehicle – Pressure regulation
Patent
1991-09-30
1993-02-16
Joyce, Harold
Ventilation
Vehicle
Pressure regulation
B64D 1304
Patent
active
051866811
ABSTRACT:
The rate of change of cabin air pressure in an aircraft cabin during aircraft ascent and descent is controlled as a function of a ratio which is equal to (P.sub.ld -P.sub.c)/(P.sub.ld -P.sub.a) during descent, and is equal to (P.sub.cc -P.sub.c)/(P.sub.cr -P.sub.a) during ascent, where P.sub.ld is ambient pressure at the aircraft landing site, P.sub.c is cabin pressure, P.sub.a is external aircraft ambient pressure, P.sub.cc is cabin pressure at cruise altitude, and P.sub.cr is ambient pressure at cruise altitude. A set point value for the ratio is computed throughout aircraft ascent and descent, and compared to the ratio to schedule a variable flow area of an outflow valve in order to drive the difference (i.e., the error) between the ratio and the desired value for the ratio to zero. By using an adjustable value for the desired set point, control of cabin pressure rate of change is improved during ascent and descent, since the cabin pressure rate of change is maintained at a reduced, linear rate, thereby providing a more comfortable environment for passengers.
REFERENCES:
patent: 3376803 (1966-07-01), Emmons
patent: 3473460 (1968-01-01), Emmons
patent: 3577902 (1971-05-01), Gardner
patent: 4553474 (1985-11-01), Wong et al.
Joyce Harold
O'Shea Patrick J.
United Technologies Corporation
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