Power/torque limiter unit for free turbine type engines
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United States of America Patent
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Jun 11, 1985
Grant Date -
N/A
app pub date -
Feb 7, 1983
filing date -
Feb 7, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The disclosure teaches an improvement in a free turbine type engine which comprises a power limit unit. The unit includes a first sensor for measuring pressure at the turbine inlet, and a second sensor for measuring temperature at the turbine inlet. A third means provides a measurement indicative of turbine exhaust pressure and may be a sensor located in the exhaust duct which is downstream of the turbine or may comprise means for providing outside ambient pressure readily available from existing aircraft instrumentation, e.g., altimeter. A processor means calculates shaft horse power (SHP) from the above measurements. Other means are provided for generating a reference signal, and the reference signal is compared with SHP. When SHP is greater than the reference signal, then fuel to the engine is controlled to reduce engine power. The unit can also be adapted for calculating torque, and for reducing the torque when the torque is greater than the reference level. The invention also relates to a method for limiting power or torque using the above apparatus.
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