Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1987-09-04
1989-05-30
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 25, H02H 504
Patent
active
048356549
ABSTRACT:
A control system for a gas turbine engine guards the engine against destructive overspeed resulting from failure of electronic components in the system due to overheating. A main electronic (preferably digital) controller is normally in control of fuel flow to the engine by means of a flow metering unit. In addition, an electronic overspeed limiter guards against overspeed at normal system temperatures, should the main controller fail, by overriding the action of the main controller on the flow metering unit. A failsafe unit is responsive to the temperature of the control system, and comprises components rated at a substantially higher peak operating temperature than the components used in the other units. The failsafe unit acts as an ultra-reliable switch operative to depower the main controller, and, optionally, the overspeed limiter, when the temperature of the control system exceeds a predetermined value above which components in the two latter units are likely to fail. Consequent upon this depowering, the fuel flow metering unit is automatically set to a low fuel flow rate at which overspeed of the engine is impossible for all conditions of the engine.
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Pellinen A. D.
Rolls-Royce plc
Wyjocki A. Jonathan
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