Method of controlling an overspeed safety system for aeroengines and a control circuit for implementing said method
First Claim
1. A method of controlling an overspeed safety system for a rotorcraft having at least two engines, the method comprising:
- setting the overspeed safety system for the engines of the rotorcraft to allow the engines to be shut down;
monitoring, by a control circuit in communication with the engines, the speeds of rotation of the engines;
detecting, by the control circuit, overspeed on one of the engines;
shutting down, by the control circuit, the engine overspeeding in the event of detecting overspeed;
in response to the overspeeding engine being shut down due to overspeeding, inhibiting, by the control circuit, the operation of the overspeed safety system for the other engine(s) of the rotorcraft still in operation to prevent the other engine(s) still in operation from being shut down;
monitoring, by the control circuit, safety parameters associated with the operation of the engines and/or safety parameters associated with the shutting down of the overspeeding engine that has been shut down; and
resetting, by the control circuit, the overspeed safety system for the other engine(s) still in operation, as a function of one or more of the safety parameters, so as to reactivate the function providing protection against the other engine(s) still in operation taking on an overspeed condition by allowing the other engine(s) to be shut down;
wherein, in the event of the overspeeding engine being a first engine of the rotorcraft, selecting a power selector of the first engine so as to authorize shutdown of an overspeeding second engine of the rotorcraft in the event of the second engine overspeeding.
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Accused Products
Abstract
A method of controlling an overspeed safety system for an aircraft having at least two engines. The method includes setting said overspeed safety system for the engines, monitoring the speeds of rotation of the engines, detecting overspeed on one of the engines, shutting down the engine in question in the event of detecting overspeed, and inhibiting the operation of the overspeed safety system for the other engine(s) still in operation. The method also comprises the steps of monitoring safety parameters associated with the operation and/or the shutting down of the engine that has been shut down; and maintaining the inhibition or resetting the overspeed safety system for the other engine(s) still in operation, as a function of one or more safety parameters.
19 Citations
15 Claims
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1. A method of controlling an overspeed safety system for a rotorcraft having at least two engines, the method comprising:
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setting the overspeed safety system for the engines of the rotorcraft to allow the engines to be shut down; monitoring, by a control circuit in communication with the engines, the speeds of rotation of the engines; detecting, by the control circuit, overspeed on one of the engines; shutting down, by the control circuit, the engine overspeeding in the event of detecting overspeed; in response to the overspeeding engine being shut down due to overspeeding, inhibiting, by the control circuit, the operation of the overspeed safety system for the other engine(s) of the rotorcraft still in operation to prevent the other engine(s) still in operation from being shut down; monitoring, by the control circuit, safety parameters associated with the operation of the engines and/or safety parameters associated with the shutting down of the overspeeding engine that has been shut down; and resetting, by the control circuit, the overspeed safety system for the other engine(s) still in operation, as a function of one or more of the safety parameters, so as to reactivate the function providing protection against the other engine(s) still in operation taking on an overspeed condition by allowing the other engine(s) to be shut down; wherein, in the event of the overspeeding engine being a first engine of the rotorcraft, selecting a power selector of the first engine so as to authorize shutdown of an overspeeding second engine of the rotorcraft in the event of the second engine overspeeding. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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4. A rotorcraft comprising:
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at least two engines; and a control circuit configured to detect overspeed on each of the engines, shut down a first overspeeding engine of the rotorcraft, deactivate an overspeed safety system for at least a second engine of the rotorcraft that is still powered in response to the first engine being shut down whereby the second engine is prevented from being shut down, monitor safety parameters associated with the operation of the engines and/or safety parameters associated with the shutting down of the first engine, and reactivate, as a function of one or more of the safety parameters, the overspeed safety system for the second engine so as to reactivate the function providing protection against the second engine taking on an overspeed condition whereby the second engine is allowed to be shut down, wherein, in the event of overspeed of the first engine, the control circuit is further configured to enable a power selector of the first engine to be selected so as to authorize shutdown of the second engine in the event of the second engine overspeeding.
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- 14. A control system for an overspeed safety system of a rotorcraft having at least two engines, the control system comprising a control circuit configured to detect overspeed on each of the engines, shut down a first overspeeding engine of the rotorcraft, deactivate the overspeed safety system for at least a second engine of the rotorcraft that is still powered in response to the first engine being shut down whereby the second engine is prevented from being shut down, monitor safety parameters associated with the operation of the engines and/or safety parameters associated with the shutting down of the first engine, and reset, as a function of one or more of the safety parameters, the overspeed safety system for the second engine so as to reactivate the function providing protection against the second engine taking on an overspeed condition whereby the second engine is allowed to be shut down, wherein, in the event of overspeed of the first engine, the control circuit is further configured to enable a power selector of the first engine to be selected so as to authorize shutdown of the second engine in the event of the second engine overspeeding.
Specification