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

Claim 19:
20. A method of utilizing an auxiliary power system to regulate a bleed air temperature (BAT) of a bleed air flow generated by an auxiliary power unit (APU), the method comprising:
compressing a load compressor airflow to generate the bleed air flow;
measuring the BAT with a BAT sensor suite;
generating a BAT signal with the BAT sensor suite, wherein the generating the BAT signal is based, at least in part, on the BAT; and
transmitting the BAT signal to an APU controller;
wherein the BAT sensor suite includes a BAT magnitude sensor and a BAT thermal switch; and
wherein the measuring the BAT includes:
(i) exposing the BAT magnitude sensor to the bleed air flow and generating a BAT magnitude sensor signal that is indicative of the BAT; and
(ii) exposing the BAT thermal switch to the bleed air flow and generating a BAT thermal switch signal, wherein the BAT thermal switch signal defines a low-temperature output value when the BAT is less than a threshold BAT range, and further wherein the BAT thermal switch signal defines a high-temperature output value, which differs from the low-temperature output value, when the BAT is greater than the threshold BAT range;
and further 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.