Patent ID: 6623250
Filing Date: 2003-09-23
Classification: F04C,Y10T

Abstract:
A fuel metering unit for controlling a fuel pump comprising:a) a servovalve having a torque motor for applying a force, a first nozzle in fluid communication with the fuel pump and a second nozzle in fluid communication with the fuel pump; b) an elongated arm disposed between the first and the second nozzles so as to vary fluid flow through the first and second nozzles and operatively mounted to the torque motor, such that actuation of the torque motor controls output of the fuel pump; and c) a flow meter in fluid communication with an output of the fuel pump, the flow meter having a housing and a valve member slideably received within the housing, the valve member being operatively connected to the elongated arm by a first spring for variably applying a biasing force against the elongated arm in response to the output of the fuel pump so as to schedule fuel flow accurately and the flow meter further including a second spring between the housing and valve member for applying a biasing force to the valve member.