Method for controlling a turbomachine valve

Patent metadata

Field	Value
Publication number	US-2019368368-A1
Application number	US-201716463002-A
Country	US
Kind code	A1
Filing date	Nov 22, 2017
Priority date	Nov 22, 2016
Publication date	Dec 5, 2019
Grant date	—

Abstract

The invention concerns a method for controlling a control valve ( 20 ) of a turbomachine operating at an engine speed at a cruise value (Vc) and oscillating around the cruise value (Vc) of same, the method being implemented by a calculation unit ( 40 ), and being characterised in that it comprises a step of determining a position control for the control valve ( 20 ), filtered of the oscillations of the engine speed around the cruise value (Vc).

First claim

1 . A method for controlling a valve ( 20 ) for monitoring a turbomachine, said valve being intended to monitor the clearance between a turbine blade and a casing by injection of air on the casing, the turbomachine operating in engine speed at a cruise value (Vc) and oscillating about its cruise value (Vc),
the method being implemented by a calculation unit ( 40 ), and being characterized in that it comprises a step of determining, for the monitoring valve ( 20 ), a position command, filtered from the oscillations of the engine speed about the cruise value (Vc).

2 . The method according to claim 1 , wherein the filtering is carried out using a low-pass filter whose cutoff frequency (fc) is greater than a frequency (fr) associated with the thermal response time of the casing ( 16 ).

3 . The method according to claim 1 , wherein the determination step comprises the following sub-steps:
(E1) receiving data quantifying the engine speed of the turbomachine, (E2) determining a flow rate command from the data quantifying the engine speed, (E3) determining a position command from the flow rate command, said position command being intended for the monitoring valve, (Ef) Filtering the position command resulting from the step of determining the position command (E3).

4 . The method according to claim 2 , wherein the low-pass filter is a first-order filter.

5 . The method according to claim 2 , wherein said monitoring valve ( 20 ) is intended to supply air to the inside of a casing ( 16 ) in order to modify its expansion.

6 . The method according to claim 2 , wherein the cutoff frequency (fc) is comprised between 0.05 Hz and 0.15 Hz.

7 . The method according to claim 2 comprising a sub-method for deactivating the command filtering step (Ef), implemented by the calculation unit ( 40 ), said sub-method comprising the following steps:
(E51) determining the gradient of the position command resulting from the step of determining a position command (E3),
(E52) comparing this gradient with a deactivation threshold (Sg),
(E53) deactivating the filter if the gradient is greater than said threshold (Sg).

8 . The method according to claim 2 , comprising a sub-method for activating the filtering step (Ef) implemented by the calculation unit ( 40 ), said sub-method comprising the following steps:
(E61) determining the gradient of the position command resulting from the step of determining a position command (E3), (E62) comparing this gradient with an activation threshold (Sg′), (E63) activating the filter if the gradient is smaller than said threshold (Sg′) during at least one confirmation period (T), and preferably if the altitude, the engine speed and the Mach also each verify a certain value.

9 . The method according to claim 2 , wherein the determination step comprises the following sub-steps:
(E1) receiving data quantifying the engine speed of the turbomachine, (Ef) data-filtering the data quantifying the engine speed resulting from the preceding step, (E2, E3) determining a position command intended for the monitoring valve ( 20 ).

10 . The method according to claim 1 , wherein the filtering is carried out using a low-pass filter whose cutoff frequency (fc) is less than a frequency (fo) of the engine speed oscillations about the cruise value (Vc).

11 . A system for controlling a valve ( 20 ) for monitoring a turbomachine operating in engine speed at a cruise value (Vc), said monitoring valve ( 20 ) being intended to supply air to a casing ( 16 ) in order to modify its expansion, said system comprising a monitoring valve and a calculation unit ( 40 ), comprising a filtration block, the calculation unit ( 40 ) being configured to implement the method according to any one of claims 1 at 10 , the filtration block implementing the filtering step.

12 . A turbomachine comprising a system according to claim 11 .

Assignees

• Safran Aircraft Engines

Inventors

• Mache Florian
• Rodhain Arnaud

Classifications

• F05D2270/44

  active, predictive, or anticipative · CPC title

• F05D2270/11

  to prolong engine life · CPC title

• F05D2270/20

  to optimize the performance of a machine · CPC title

• F01D9/065

  Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids (see also F01D25/16, F01D25/24 and F01D25/26) · CPC title

• F05D2270/64

  Hydraulic actuators · CPC title