Fuel metering unit

Details Fuel metering unit Fuel metering unit

1993-12-20

1996-02-13

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

F02C 928

Patent

active

054903793

ABSTRACT:
A fuel metering unit for an aircraft gas turbine engine has both electronic and manual control, both compensated for altitude variations. A three-dimensional cam is used to control the position of a fuel metering valve. One axis of the 3-D cam is electronically controlled and another is mechanically controlled. Electronic control is the normal mode and sets the electronic axis to provide a fuel metering valve setting which delivers a mass flow rate to the engine as demanded by the position of the fuel lever as interpreted by the electronic control. Upon failure of the electronic control, the position of the 3-D cam along the electronic axis is mechanically locked so that any further changes in fuel metering valve position are a function solely of the position of the power lever as translated to the mechanical axis of the 3-D cam. Transfer from electronic to manual control is therefore "bumpless."

REFERENCES:
patent: 3381470 (1968-05-01), Hammerstein et al.
patent: 3820323 (1974-06-01), Burnell et al.
patent: 4270345 (1981-06-01), Kast
patent: 4608820 (1986-09-01), White et al.
patent: 4793133 (1988-12-01), White et al.
patent: 4794755 (1989-01-01), Hutto et al.

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