Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
1999-08-03
2001-03-06
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C137S486000, C137S487500, C137S883000, C137S885000
Reexamination Certificate
active
06196248
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates generally to a fuel flow control system and in particular to a fuel flow control system which uses multiplexing to sense pressure in a fuel distribution system and to control servoflow to multiple valves. Conventional systems use a manifold to distribute fuel to a plurality of zones. In order to control fuel flow at each zone, individual fuel metering devices are used at the inlet to each zone. Each individual fuel metering device includes an electro-hydraulic servovalve, a metering valve, a pressure drop regulator, and a throttling or bypass valve. Using such fuel metering devices at each zone increases the cost, complexity and weight of the system. Accordingly, there is a perceived need in the art for an improved fuel control system.
BRIEF SUMMARY OF THE INVENTION
An exemplary embodiment of the invention is directed to a fuel flow control system for use with a fuel distribution system having a plurality of zones each including a servovalve. The fuel flow control system includes a fluidic multiplexer having a plurality of pressure ports and a plurality of servoflow ports. The fluidic multiplexer sequentially receives pressure from each zone and sequentially provides servo fluid to each servovalve. A pressure sensor is fluidly coupled to the pressure ports and generates a pressure signal for each zone. A controller receives the pressure signal and generates a control signal. A driver receives the control signal and increases or decreases flow through the servoflow ports in response to the control signal.
REFERENCES:
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patent: 5546988 (1996-08-01), Perkey et al.
patent: 5551478 (1996-09-01), Veilleux et al.
patent: 5570718 (1996-11-01), Smith et al.
patent: 5996464 (1999-12-01), McLevige et al.
Myers, Jr. William J.
Van Alen Frederick E.
General Electric Company
Herkamp Nathan D.
Hess Andrew C.
Michalsky Gerald A.
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