Turbomachine comprising a monitoring system comprising a module for engaging a protection function of the turbomachine and monitoring method

1. An aircraft turbine engine comprising:

at least one spool rotating at speed N 1 ; and

a monitoring system comprising:

a regulating module comprising a first regulation measurement channel configured to obtain a measurement of the speed N 1 and a second regulation measurement channel, independent of the first measurement channel, configured to obtain a measurement of the speed N 1 , and means for comparing the obtained speed measurements with a thrust setpoint to provide a thrust status; and

an engagement module for engaging an anti-overthrust or anti-loss of thrust protection function of the turbine engine;

a system for protection against overspeed to prevent ejection of high-energy debris outside said turbine engine, the protection system comprising at least one overspeed measurement channel configured to obtain an overspeed of the rotating spool of the turbine engine; and

means for providing at least one measurement of overspeed on the basis of the overspeed obtained when one of the regulation measurement channels is defective,

wherein the engagement module comprises at least one means for comparison of said overspeed measurement with at least one reference speed defined according to the protection function to be engaged, said engagement module configured to engage said protection function according to results of the comparison.

2. The turbine engine according to claim 1 , wherein the system for protection against the overspeed comprises a first overspeed detection channel configured to obtain an overspeed of the rotating spool of the turbine engine and a second overspeed detection channel, independent of the first overspeed detection channel, configured to obtain an overspeed of the rotating spool of the turbine engine, the engagement module comprising means for comparison of the two overspeeds obtained with the reference speed defined according to the protection function to be engaged.

3. The turbine engine according to claim 1 , wherein the system for protection against overspeed comprises a first overspeed detection channel configured to obtain an overspeed of the rotating spool of the turbine engine and a second overspeed detection channel, independent of the first overspeed detection channel, configured to obtain an overspeed of the rotating spool of the turbine engine, said system for protection against overspeed being configured to supply a consolidated overspeed to the engagement module of the monitoring system according to the overspeeds obtained on the overspeed measurement channels and the engagement module comprising means for comparison of the consolidated overspeed obtained with the reference speed defined according to the protection function to be engaged.

4. The turbine engine according to claim 1 , wherein the overspeed measurement channel is independent of the regulation measurement channels.

5. The turbine engine according to claim 1 , wherein for the engagement of the anti-overthrust function of the turbine engine, the comparison means of the engagement module is configured to compare at least one overspeed obtained with a safety speed corresponding to a maximum permitted overthrust for the turbine engine.

6. The turbine engine according to claim 1 , comprising at least one communication link with another similar turbine engine in order to communicate to each other the value of the speed of their rotating spool, a turbine engine in which for the engagement of the anti-loss of thrust function of said turbine engine, the comparison means of the engagement module are configured in order to compare at least one obtained overspeed of said turbine engine with the speed of said other turbine engine obtained by the communication link.

7. A method for monitoring an aircraft turbine engine including at least one spool rotating at speed N 1 , said method comprising:

obtaining a first measurement of speed of the rotating spool according to a first regulation measurement channel of a monitoring system of the speed N 1 and at least a second measurement of the speed of the rotating spool according to a second regulation measurement channel of said monitoring system, independent of the first measurement channel;

comparing the measurement of speed obtained with a thrust setpoint to supply a thrust status;

obtaining a first overspeed of the rotating spool according to a first overspeed detection channel of a system for protection against overspeed configured to prevent ejection of high-energy debris outside said turbine engine, and a second overspeed of the rotating spool of the turbine engine according to a second overspeed detection channel of the same protection system, independent of the first overspeed detection channel;

engaging an anti-overthrust or anti-loss of thrust protection function of the turbine engine using the two overspeed values obtained to compare the overspeed measurement with at least one reference speed defined according to the protection function to be engaged.

8. A method for monitoring an aircraft turbine engine including at least one spool rotating at speed N 1 , said method comprising:

obtaining a first measurement of speed of the rotating spool according to a first regulation measurement channel of a monitoring system of the speed N 1 and at least a second measurement of the speed of the rotating spool according to a second regulation measurement channel of said monitoring system, independent of the first measurement channel;

comparing the speed measurements obtained with a thrust setpoint to supply a thrust status;

obtaining an overspeed of the rotating spool according to at least a first overspeed measurement channel, independent of the regulation measurement channels, of a system of protection against overspeed configured to prevent ejection of high-energy debris outside said turbine engine; and

engaging an anti-overthrust or anti-loss of thrust protection function of the turbine engine by comparison of said overspeed obtained with at least one reference speed defined according to the protection function to be engaged.