# US 2010/0168982 A1 · Method and system for controlling at least one actuator for actuating the cowlings of a thrust inverter in a turbojet engine

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- Number: US 2010/0168982 A1
- Document ID: US20100168982A1
- Status: Published application
- Kind: A1
- Application number: 12/673,890
- Filed: 2008-07-16
- Published: 2010-07-01
- Earliest claimed: 2007-08-20
- Assignees: Aircelle
- Inventors: Hakim Maalioune
- Web page: https://patentgrep.com/patent/US20100168982A1

## CPC

- F02K 1/763: {with actuating systems or actuating devices; Arrangement of actuators for thrust reversers}
- F02K 1/72: the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
- F05D 2270/62: Electrical actuators
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The invention relates to a method for controlling at least one actuator for actuating the cowlings of a thrust inverter in a turbojet engine, the actuator being driven by an electric motor including a relative position sensor providing information on the evolution of the movement thereof, wherein the motor is controlled based on the instantaneous position of the cowling in at least one portion of the movement thereof between an open position and a closed position, the instantaneous position of the cowling being determined from at least one reference position absolute data and relative position data relative to said reference position provided by the relative position sensor of the motor, wherein in case the actuation is resumed after an interruption, a new determination of the reference position is initiated.

## Claims

### Claim 1

A method of controlling at least one actuator for actuating cowlings of a thrust reverser for a turbojet engine, the actuator being driven-by an electric motor including a relative position sensor supplying information on the evolution of its movement, wherein the control of the engine is servo-controlled (based on an instantaneous position of the cowling in at least a portion of its travel between an open position and a closed position, the instantaneous position of the cowling being determined as a function of at least one reference position absolute datum and relative position data relative to said reference position supplied by the relative position sensor of the engine, wherein, in case the actuation is resumed after an interruption, a new determination of the reference position is initiated.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the reference position is determined as an extreme position of the travel of the cowling.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the reference position is determined on a basis of at least one absolute position datum of the cowling supplied by an absolute position sensor of the cowling.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the reference position is calculated as an average of at least two absolute position values supplied by absolute position sensors of the cowling.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein position values supplied by at least one absolute position sensor of the cowlings are compared to a range of values corresponding to the travel of the cowling.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein, in case of failure to determine a reference position value, control of the engine is modified to lower torque and/or speed of the engine.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein a stop position is used to determine the reference position upon the resumption.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein a relative position signal for the engine and the stop position are used to determine the new reference position.

### Claim 9 (depends on 1)

A system for controlling at least one actuator for actuating cowlings of a thrust reverser for a turbojet engine, comprising:
at least one actuator for actuating a cowling driven by at least one electric motor, and
means of controlling the actuator and the electric motor,
the electric motor including a relative position sensor supplying information on evolution of its movement,
wherein the control means are arranged to perform the method as claimed in claim 1.