Patent ID: 7540141
Filing Date: 2009-06-02
Classification: F02C,F05D

Abstract:
1. A fuel control system for a gas turbine engine that comprises: a fuel pump for delivering fuel from a fuel supply source to the engine; a variable speed pump motor for powering the fuel pump; an engine controller that senses a fuel pressure signal that represents pressure of fuel that the system delivers to fuel nozzles in the engine to measure delivered fuel pressure, compares the delivered fuel pressure to a fuel flow schedule to generate a motor speed command signal that represents a pump motor speed for a desired fuel flow from the pump; and a motor controller that powers the pump motor, compares the speed of the pump motor to the motor speed command signal, senses any variation of the speed of the motor from the motor speed command signal and uses the resulting difference to modulate the power that it sends to the pump motor to make the pump deliver the desired fuel flow wherein the motor controller receives a motor position signal representing angular position of the shaft to compare the speed of the pump motor to the motor speed command signal; and wherein a motor position sensor generates the motor position signal.