US 12,128,838 B2
Methods and systems for operating an auxiliary power unit
Claude Lavoie, Laval (CA); and Marek Hicar, Hudson (CA)
Assigned to BOMBARDIER INC., Dorval (CA)
Filed by BOMBARDIER INC., Dorval (CA)
Filed on Nov. 27, 2020, as Appl. No. 17/105,731.
Claims priority of provisional application 62/940,970, filed on Nov. 27, 2019.
Prior Publication US 2021/0155179 A1, May 27, 2021
Int. Cl. H02H 3/08 (2006.01); B60R 16/03 (2006.01); B64D 41/00 (2006.01); H02H 9/02 (2006.01); H02J 4/00 (2006.01)
CPC B60R 16/03 (2013.01) [B64D 41/00 (2013.01); H02H 3/08 (2013.01); H02J 4/00 (2013.01); B64D 2041/002 (2013.01); B64D 2221/00 (2013.01); H02J 2310/44 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating an auxiliary power unit (APU) of an aircraft, the method comprising:
obtaining external environment parameters of the aircraft at a current altitude of the aircraft;
determining an available output power for the APU as a function of the external environment parameters;
setting an overcurrent protection threshold of the APU to a level associated with the available output power;
lowering the current altitude of the aircraft; and
after lowering the current altitude of the aircraft, increasing the overcurrent protection threshold of the APU.