Aircraft cabin pressure control system and method for...

Data processing: generic control systems or specific application – Generic control system – apparatus or process – Optimization or adaptive control

Reexamination Certificate

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Details

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C454S074000

Type

Reexamination Certificate

Status

active

Patent number

07454254

Description

ABSTRACT:
A cabin pressure control system and method that reduces or inhibits gear train backlash and the concomitant cabin pressure oscillations associated therewith. The cabin pressure control system includes a variable proportional-integral (PI) controller that implements a proportional function with a variable gain term and an integrator function with variable saturation limit. The proportional function gain term is increased, and the integrator saturation limits are decreased, at relatively low cabin error rate magnitudes. Increasing the proportional function gain term at relatively low cabin error rate magnitudes offsets potential backlash effects from the gear train. Decreasing the integrator saturation limits at relatively low cabin rate error magnitudes reduces potentially excessive integrator wind-up levels, which reduces the likelihood of producing limit-cycling and the potential for cabin pressure oscillations.

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