Patent ID: 9205927
Filing Date: 2015-12-08
Classification: B64D,F02C,F05D,Y02T

Abstract:
1. An aircraft environmental control system, comprising: an air cycle machine having a bleed air inlet and a conditioned air outlet, the air cycle machine adapted to selectively receive a flow of bleed air at the bleed air inlet and configured, upon receipt thereof, to discharge conditioned air from the conditioned air outlet, the conditioned air having a temperature lower than the bleed air; an inlet flow control valve coupled to the bleed air inlet and adapted to receive bleed air discharged from a gas turbine engine, the inlet flow control valve coupled to receive valve commands and configured, in response to the valve commands, to move between a closed position and a plurality of open positions; an exhaust gas temperature (EGT) sensor configured to sense EGT of the gas turbine engine and supply an EGT signal representative thereof; a conditioned air temperature sensor configured to sense the temperature of the conditioned air and supply a conditioned air temperature signal representative thereof; and a controller coupled to receive the EGT signal and the conditioned air temperature signal and, based on the EGT and conditioned air temperature signals, configured to supply valve commands to the inlet flow control valve to thereby control the flow of bleed air into the bleed air inlet.