Aircraft cabin pressure controls with an open-loop motor...

Details Aircraft cabin pressure controls with an open-loop motor... Aircraft cabin pressure controls with an open-loop motor...

2007-02-09

2010-02-09

Lateef, Marvin (Department: 3749)

Ventilation

Vehicle

Pressure regulation

C454S070000, C454S072000, C454S074000, C454S075000, C454S076000

Reexamination Certificate

active

07658669

ABSTRACT:
A cabin pressure control system (CPCS) software control logic modification may boost the voltage applied to a motor when conditions are sensed indicating a combination of larger than normal cabin pressure and cabin rate error conditions. The motor may be part of an open-loop system for operating a butterfly valve that may regulate outflow from the aircraft cabin. The larger than normal cabin pressure and cabin rate error conditions may be an indication that the outflow valve is not responding in a normal manner, potentially caused by excessive loading to the motor or motor degradation. By boosting the motor voltage during excessive load conditions or with a degraded motor, CPCS performance and robustness may be improved.

REFERENCES:
patent: 4164896 (1979-08-01), Aldrich
patent: 4694390 (1987-09-01), Lee
patent: 5238220 (1993-08-01), Shell et al.
patent: 5297987 (1994-03-01), Emmons et al.
patent: 5543696 (1996-08-01), Huggett et al.
patent: 6962324 (2005-11-01), Bunn et al.
patent: 6979257 (2005-12-01), Horner et al.

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