Patent ID: 9541028
Date: 2017-01-10
CPC Classifications: F02K,F05D

Claim:
1. A turbofan engine control system for managing a low pressure turbine speed comprising: a low spool including a low pressure turbine housed in a core nacelle, the low pressure turbine rotatable at a speed and having a maximum design speed; a turbofan coupled to the low spool; a fan nacelle surrounding the turbofan and core nacelle and providing a bypass flow path having a nozzle exit area; a controller programmed to command a flow control device and effectively decrease the nozzle exit area in response to a condition that would result in at least an undesired speed of the low pressure turbine for maintaining the speed below the maximum design speed; and a gear train interconnecting the low spool and the turbofan for reducing a turbofan speed relative to the speed.