Patent ID: 7454254
Filing Date: 2008-11-18
Classification: B64D,G05B,Y02T

Abstract:
1. An aircraft cabin pressure control system controller circuit, comprising: a comparator configured to receive a cabin pressure rate-of-change command signal and a sensed cabin pressure rate-of-change signal and operable, in response thereto, to supply a cabin rate error signal representative of a difference between the cabin pressure rate-of-change command signal and the sensed cabin pressure rate-of-change signal; and a variable gain proportional-integral (PI) controller coupled to receive the cabin rate error signal and operable, in response thereto, to generate an actuator command signal and determine a magnitude of the cabin rate error, the variable gain PI controller including a proportional function and an integrator function, the proportional function having a variable gain term, the integrator function having a variable upper saturation limit and a variable lower saturation limit, the variable gain PI controller further operable, upon receipt of the cabin rate error signal,