Patent ID: 11873081
Assignee: TEXTRON INNOVATIONS INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A method, comprising:
operating a rotorcraft comprising a drive system having a main rotor coupled to a main rotor gearbox, a main engine applying a first power to the drive system, and a supplemental engine applying a second power to the drive system when a first clutch is engaged;
determining a total power demand to drive the main rotor at a rotor speed;
governing the rotor speed with the main engine, the governing comprising using, by the main engine, a power compensation command received in response to variation in the rotor speed;
providing the first power in response to the power compensation command;
controlling, by a processor of a control system, the supplemental engine with a supplemental power demand; and
providing the second power in response to the supplemental power demand imposing, by the processor of the control system, an upper supplemental power limit to maintain the first power at a first power level for the main engine to govern the rotor speed; and
imposing, by the processor of the control system, a lower supplemental power limit to maintain the first clutch engaged;
wherein the upper supplemental power limit takes priority over the lower supplemental power limit during operation when the main engine is controlling the rotor speed.