Engine control system
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United States of America Patent
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May 4, 2004
Grant Date -
May 22, 2003
app pub date -
Sep 26, 2001
filing date -
Sep 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A power turbine speed control system for a helicopter is disclosed which includes components for generating a power turbine speed signal based upon a demanded rotor speed, a high-order filter for filtering the power turbine speed signal by effectuating a rapid attenuation of main and tail rotor torsional frequencies in the power turbine speed signal without compromising phase at low frequencies, and a governor for providing isochronous power turbine speed and rotor speed control based upon the filtered power turbine speed signal.
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