US 10,480,423 B2Granted

Turbopropeller control system with control saturation management

AssigneeSafran Aircraft Engines

InventorBogdan Christian Liacu

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Abstract

A control system (10) of a turbopropeller (1) including: a centralized control (24) configured to slave the screw propeller power PRW of the turbopropeller (1) to the screw propeller power set point PRWref and the screw propeller rotation speed XNP of the turbopropeller (1) to the screw propeller rotation speed set point XNPref, the centralized control (24) supplying fuel flow rate WF and screw propeller pitch β controls for the turbopropeller (1); a screw propeller rotation speed error limiter (12) saturating the screw propeller rotation speed error ΔXNP with a limiting value Δ ⁢ ⁢ XNP sat ⁡ ( min ⁢ / ⁢ max ) ; and a screw propeller power error limiter (11) saturating the screw propeller power error ΔPRW with a limiting value Δ ⁢ ⁢ PRW sat ⁡ ( min ⁢ / ⁢ max ) .

Claims11

Dependent claims

A screw propeller power PRW and a screw propeller rotation speed XNP control system of a turbopropeller having a variable pitch screw propeller based on a screw propeller power set point PRWref and a screw propeller rotation speed set point XNPref, including:

a centralized control configured to slave the screw propeller power PRW of the turbopropeller to the screw propeller power set point PRWref and the screw propeller rotation speed XNP of the turbopropeller to the screw propeller rotation speed set point XNPref, the centralized control supplying fuel flow rate WF and screw propeller pitch β controls for the turbopropeller;
wherein the control system includes:
a screw propeller rotation speed error limiter saturating the screw propeller rotation speed error ΔXNP with a limiting value
Δ
⁢
⁢
XNP
sat
⁡
(
min
/
max
)
;
a screw propeller power error limiter saturating the screw propeller power error ΔPRW with a limiting value
Δ
⁢
⁢
PRW
sat
⁡
(
min
/
max
)
;
the values
Δ
⁢
⁢
XNP
sat
⁡
(
min
/
max
)
⁢
⁢
and
⁢
⁢
Δ
⁢
⁢
PRW
sat
⁡
(
min
/
max
)
being selected so that the fuel flow rate WF and screw propeller pitch β controls comply with the constraints imposed by operating constraints of the turbopropeller to limit a screw propeller pitch of the variable pitch screw propeller and an amount of torque applied to a screw propeller shaft of the variable pitch screw propeller.

54 more elements

A method for controlling the screw propeller power PRW and the screw propeller rotation speed XNP of a turbopropeller having a variable pitch screw propeller based on a screw propeller power set point PRWref, and a screw propeller rotation speed set point XNPref, the method including steps of:

E1 measuring the screw propeller rotation speed XNP at the output of the turbopropeller and estimating the screw propeller power PRW;
E2 calculating the screw propeller power error ΔPRW as the difference between the screw propeller power PRW measured at the output of the turbopropeller and the screw propeller power set point PRWref, and calculating the screw propeller rotation speed error ΔXNP as the difference between the screw propeller rotation speed XNP measured at the output of the turbopropeller and the screw propeller rotation speed set point XNPref;
E3 calculating limiting values
Δ
⁢
⁢
XNP
sat
⁡
(
min
/
max
)
⁢
⁢
and
⁢
⁢
Δ
⁢
⁢
PRW
sat
⁡
(
min
/
max
)
guaranteeing that the fuel flow rate control WF complies with constraints imposed by operating constraints of the turbopropeller, to limit a screw propeller pitch of the variable pitch screw propeller and an amount of torque applied to a screw propeller shaft of the variable pitch screw propeller;
E4 saturating the screw propeller power error ΔPRW with the limiting value
Δ
⁢
⁢
PRW
sat
⁡
(
min
/
max
)
and the screw propeller rotation speed error ΔXNP by the limiting value
Δ
⁢
⁢
XNP
sat
⁡
(
min
/
max
)
;
E5 calculating the fuel flow rate WF and screw propeller pitch controls based on the saturated screw propeller power error ΔPRW and the saturated screw propeller rotation speed error ΔXNP.

54 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/666,441Filed 1 Aug 2017
Priority: FR 16 5773912 Aug 2016
Published: US 2018/0045123 A115 Feb 2018
Granted: 19 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02C 9/58
With power transmission control: with control of a variable-pitch propeller
F05D 2220/32
In turbines: in gas turbines
F05D 2220/324
In gas turbines: to drive unshrouded, low solidity propeller
F05D 2240/35
Components: combustors or associated equipment

Family

US 2018/0045123 A1Pre-grant publication · published 15 Feb 2018
US 10,480,423 B2This patent

From the US filing history. Foreign family members aren’t listed.

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