F - Mech Eng,Light,Heat,Weapons – 02 – C
Patent
F - Mech Eng,Light,Heat,Weapons
02
C
341/89
F02C 9/28 (2006.01) B64D 31/12 (2006.01) F02C 9/42 (2006.01)
Patent
CA 1161527
-12- ABSTRACT OF THE DISCLOSURE A closed loop control system is presented which trims fuel flow to the turbine engines of a multi-engine aircraft in response to fan speed and turbine temperature measurements. The closed loop system is activated after the initial climb out phase of flight. To engage -the automatic control system the pilot will first preset a not-to-exceed measured gas tempera- ture for the turbines and secondly, adjust the throttles to bring engine fan speeds within the pull-in range of the synchro- nizer. This done, the pilot engages the closed loop control system which functions by having fan speed and turbine tempera- ture data signals transmitted to an electronic type master control unit. Acting on the incoming signal data, the master control unit pulses throttle actuators, There is a throttle actuator serially connected between each throttle lever and the fuel control valve associated therewith. Each throttle actuator is capable of increasing and decreasing the effective preset value of a throttle by an amount just sufficient to maintain speed synchronization and temperature control of the associated engine during the cruise phases of flight, The automatic system has limited authority and the pilot can override at any time by simply moving the throttle levers.
394263
Avco Corporation
Ridout & Maybee Llp
LandOfFree
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