Governorless gas turbine fuel control

F - Mech Eng,Light,Heat,Weapons – 02 – C

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341/17, 341/38.1

F02C 9/26 (2006.01) F02C 9/28 (2006.01)

Patent

CA 1143036

GOVERNORLESS GAS TURBINE FUEL CONTROL ABSTRACT Fuel flow to a gas turbine engine is controlled in response to power lever position and CDP. Fuel is supplied to the engine through three fuel flow regulating circuits which are in parallel. In one of these circuits there is a valve which establishes a minimum fuel flow which decreases with increasing power lever advance. In a second circuit there is a valve which modifies fuel flow in response to CDP. In a third circuit there is a valve which modifies fuel flow in response to CDP and receives fuel from a valve which opens with increasing power lever advance. The fuel control system includes a low power sensitive torque motor which may be activated to increase the pressure drop across the three circuits. whose flow thus increases proportionally. Normal engine operation is obtainable without the use of the torque motor which provides an interface to an electronic control unit which senses various engine and ambient parameters and activates the torque motor in order to modify fuel flow accordingly. H904-CC

358906

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