Pitch control system

Details Pitch control system Pitch control system

1989-12-26

1991-08-06

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416157R, 416165, B64C 1140

Patent

active

050372718

ABSTRACT:
A pitch control system has a main electronic control, a mechanical back-up control and a switching system for transferring pitch control from the electronic to the mechanical control in the event of electronic control failure. The switching system utilizes a switch for comparing the output of the electronic and mechanical control systems, the switch choosing the mechanical system if a failure occurs in the electronic control system. In certain failure modes, an enable solenoid simultaneously locks out the switch, to ensure mechanical pitch change control, and resets the mechanical back-up control to provide a lower degree of pitch control than conventional back-up controllers.

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