Turbine engine control with electronic and pneumatic governors
First Claim
1. An engine excess stress avoidance process for a fuel burning engine having an electronic control unit and a pneumatic engine speed governor, comprising the steps of:
- disabling the pneumatic governor so long as the engine speed exceeds a prescribed value and the electronic control unit continues to function properly;
monitoring an engine operating parameter; and
diminishing fuel flow to the engine when the monitored engine operating parameter exceeds a threshold value.
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Accused Products
Abstract
A turbine engine (49) fuel delivery system of the type including a pneumatic governor has an electronic governor and an engine excess stress avoidance feature which disable the pneumatic governor (70) so long as the engine speed exceeds a prescribed value and an electronic control unit (45) continues to function properly. The system transfers governing responsibility to the electronic control unit (45) which controls a torque motor and solenoid valve fuel diversion line (22). The system monitors an engine (49) operating parameter such as gas generator speed (37), power turbine speed, engine output torque, or engine temperature and further diminishes fuel flow to the engine (49) when the monitored parameter exceeds a threshold value. The system resumes normal speed governoring flow when that parameter returns to an acceptable level. The system also senses rotor blade pitch to reduce rotor droop and increases fuel flow to the engine (49) when the pitch (44) increases, and decreasing the fuel flow to the engine (49) when the rotor blade pitch (44) decreases.
30 Citations
9 Claims
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1. An engine excess stress avoidance process for a fuel burning engine having an electronic control unit and a pneumatic engine speed governor, comprising the steps of:
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disabling the pneumatic governor so long as the engine speed exceeds a prescribed value and the electronic control unit continues to function properly;
monitoring an engine operating parameter; and
diminishing fuel flow to the engine when the monitored engine operating parameter exceeds a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification