Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1983-02-07
1985-06-11
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
60 39282, F02C 928
Patent
active
045220263
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.
REFERENCES:
patent: 3106062 (1963-10-01), Rosenberg
patent: 3420056 (1969-01-01), Eames
patent: 3851463 (1974-12-01), Robinson
patent: 4008567 (1977-02-01), Hirsch
patent: 4286324 (1981-08-01), Ingram
d'Anjou Daniel
Peterson Gudmundur P.
Casaregola Louis J.
Pratt & Whitney Canada Inc.
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