Power plants – Combustion products used as motive fluid – With safety device
Patent
1985-05-02
1986-10-28
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
With safety device
60 39281, F02C 928
Patent
active
046191100
ABSTRACT:
A helicopter turbine engine over-stress warning and protection system includes arrangements for sensing the engine temperature, the engine speed, and the output torque from the engine. An audible signal warning is provided which may vary as the over-stress limits are approached. For example, when the helicopter engine is at or above the over-stress limits, it may have a constant fairly loud tone into the pilot's earphones or into a speaker in the cockpit. This warning tone signal becomes interrupted and provides progressively greater periods of silence as the helicopter engine drops below the over-stress limits. The warning signal stops at a pre-set point such as, for example, when the engine is being operated from 5% to 15% below the over-stress limits. Dynamic response control circuits are provided to avoid false actuation of the alarm system; automatic limitation of the fuel flow to the engine may be provided in combination with a conveniently located override actuator; and arrangements may also be provided for automatically injecting water or alcohol into the engine as over-stress conditions are approached.
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