Direct controlled control valve with an offset of a digital to a

Details Direct controlled control valve with an offset of a digital to a Direct controlled control valve with an offset of a digital to a

1989-11-30

1991-07-16

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

60727, 36443102, F02C 928

Patent

active

050313983

ABSTRACT:
A fuel control system (10) for a power unit used for generating power used for operating an airframe in accordance with the invention includes an air supply (18) for supplying pressurized air blown down from a storage vessel (14) to a combustor (16) which generates a gas stream by burning fuel supplied by a fuel supply (32) driving a turbine (50) to produce the power; a pressure sensor (26) coupled to the air supply for producing an analog signal proportional to pressure upstream in the air supply from the combustor; a digital to analog converter (54) having an offset input coupled to a signal proportional to the sensed pressure, a digital input for receiving a digital input signal, and an analog output which varies in proportion to the sum of the signal applied to the offset input and the digital input signal; a fuel control valve (38) contained with the fuel supply which is controlled as a function of the analog output signal of the digital to analog converter; an analog to digital converter (56) having at least one input and at least one output with the analog to digital converter outputting a digital signal proportional to each input signal applied to the at least one input of the analog to digital converter; and a system controller (24), responsive to the at least one output of the analog to digital converter, controlling the fuel with a periodically generated digital input signal applied to the digital to analog converter.

REFERENCES:
patent: 4158884 (1979-06-01), McKinley et al.
patent: 4712372 (1987-12-01), Dickey et al.
patent: 4718229 (1988-01-01), Riley
patent: 4777793 (1988-10-01), Weigand et al.

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