Electronic interface for a pneumatic fuel control of a gas...

Details Electronic interface for a pneumatic fuel control of a gas... Electronic interface for a pneumatic fuel control of a gas...

F - Mech Eng,Light,Heat,Weapons

15

B

121/110

F15B 11/04 (2006.01) F02C 9/46 (2006.01)

Patent

CA 1189397

ABSTRACT A pneumatic fuel control (34) for a gas turbine engine (10) having at least one compressor and turbine spool (12, 22) and a free turbine (24), including a main fuel passage (110), a metering valve (114) in said passage, a pneumatic control system (100) for said valve includ- ing a chamber (156), a governor bellows (142) in said chamber, a link- age (146) connecting said bellows (142) to said valve (114), a first passage (152) for communicating compressor discharge pressure to one side of said bellows, a second passage (158) connecting said compressor discharge pressure with the other side of said governor bellows and having a first bleed (161), and a second bleed (194) in said second passage, and a mechanical governor (50) responsive to turbine speed (Ng) for controlling said first bleed (161), an electronic governor means (48), responsive to free turbine speed (Nf), for generating an electrical signal (Ig) indicative of a desired engine output power; and means (44) for controlling said second bleed (194) in accordance with said elec- trical signal (Ig). (Figures 1, 2)

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