Patent ID: 11859554
Assignee: PRATT & WHITNEY CANADA CORP.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 11:
12. A method of operating a multi-engine system of an aircraft having a first engine and a second engine, the method comprising:
accumulating compressed air in a pressure vessel external to the first and second engines, including extracting bleed air from one or more of the first engine and the second engine and feeding the bleed air into the pressure vessel, wherein both the extracting bleed air to accumulate the compressed air in the pressure vessel and the introducing the compressed air into the second engine is carried out via one or more common ports in the second engine;
when the aircraft is in flight at an altitude above the ground, operating the first and second engines asymmetrically, by controlling the first engine to operate in an active operating condition providing sufficient power and/or rotor speed for demands of the aircraft, and controlling the second engine to operate in a standby operating condition wherein the second engine produces less power output than the first engine; and
in response to a power demand request, and when the aircraft is in flight at an altitude above the ground, accelerating the second engine by: introducing the compressed air from the pressure vessel into the second engine at a location upstream of a combustor of the second engine.