Patent ID: 11878810
Assignee: THE BOEING COMPANY
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 14:
15. An auxiliary power system configured to regulate a bleed air temperature (BAT) of a bleed air flow, comprising:
an auxiliary power unit (APU) configured to generate the bleed air flow;
an APU controller configured to receive and transmit signals; and
a BAT sensor suite configured to measure the BAT of the bleed air flow and configured to generate a BAT signal, wherein the BAT signal is based, at least in part, on the BAT, and further wherein the BAT sensor suite includes:
(i) a BAT magnitude sensor in thermal communication with the bleed air flow, wherein the BAT magnitude sensor is configured to generate a BAT magnitude sensor signal that is indicative of the BAT; and
(ii) a BAT thermal switch in thermal communication with the bleed air flow, wherein the BAT thermal switch is configured to generate a BAT thermal switch signal that has a low-temperature output value when the BAT is less than a threshold BAT range and a high-temperature output value, which differs from the low-temperature output value, when the BAT is greater than the threshold BAT range; and
wherein the BAT signal is based, at least in part, on at least one of the BAT magnitude sensor signal and the BAT thermal switch signal.