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US 8,261,545 B2Granted
Electric power actuator and control method for such an actuator
AssigneeAirbus Operations GmbH
InventorsOlivier Babando, Nicolas Larrieu
Life of this patent
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Abstract
An electric power actuator and a method of controlling such an actuator are disclosed. The actuator (1) can include means (17, 26) for limiting the pressure difference in both chambers (9, 10) of a hydraulic jack (8) of the actuator (1) to a limit pressure which is lower than an opening pressure of a pressure relief valve (11) of the actuator (1).
Claims8
An electric power actuator, said actuator (1) comprising:
- a control unit (2) which receives an electric control signal and which converts this electric control signal into a set point for an electric motor (4);
- said electric motor (4) which drives a pump (5) in accordance with said set point received from said control unit (2);
- said pump (5) which generates hydraulic power for moving a hydraulic jack (8);
- said hydraulic jack (8) which includes two chambers (9, 10) likely to be fed by said pump (5), and which generates the strain of the actuator (1);
- at least one pressure relief valve (11) for limiting the load generated by said actuator (1);
- first means (17) for measuring the pressure difference (ΔP) existing between both chambers (9, 10) of the hydraulic jack (8);
- second means (19) for calculating a correcting parameter (Pc), using said pressure difference (ΔP), said second means (19) including elements for calculating said correcting parameter (Pc) using the following expressions:
- {
- Pc
- =
- 1
- -
- λ
- λ
- =
- (
-
- Δ
-
-
- P
-
- -
- Δ
-
-
- P
-
-
- 1
- )
- /
- (
- Δ
-
-
- P
-
-
- 2
- -
- Δ
-
-
- P
-
-
- 1
- )
- λ
- ∈
- [
- 0
- ,
- 1
- ]
- wherein:
- ΔP represents said measured pressure difference;
- and
- ΔP1 and ΔP2 are two predetermined values which depend on said limit pressure;
- third means (20) for calculating, from said correcting parameter (Pc) and said set point, an auxiliary set point which enables, when it is applied to the electric motor (4), to limit the pressure difference between both chambers (9, 10) of the hydraulic jack (8) to a limit pressure which is lower than an opening pressure of the pressure relief valve (11);
- and
- fourth means (23) for applying to said electric motor (4) said auxiliary set point, instead of said set point.
60 more elements
A method for controlling an actuator (1) comprising:
- a control unit (2) which receives an electric control signal and which converts this electric control signal into a set point for an electric motor (4);
- said electric motor (4) which drives a pump (5) in accordance with said set point received from said control unit (2);
- said pump (5) which generates hydraulic power for moving a hydraulic jack (8);
- said hydraulic jack (8) which includes two chambers (9, 10) likely to be fed by said pump (5), and which generates the strain of the actuator (1);
- and
- at least one pressure relief valve (11) for limiting the strain generated by said actuator (1);
- according to which method, automatically and repeatedly:
- the pressure difference (ΔP) between both chambers (9, 10) of the hydraulic jack (8) is measured;
- a correcting parameter Pc is calculated using the following expressions:
- {
- Pc
- =
- 1
- -
- λ
- λ
- =
- (
-
- Δ
-
-
- P
-
- -
- Δ
-
-
- P
-
-
- 1
- )
- /
- (
- Δ
-
-
- P
-
-
- 2
- -
- Δ
-
-
- P
-
-
- 1
- )
- λ
- ∈
- [
- 0
- ,
- 1
- ]
- wherein:
- ΔP represents said measured pressure difference;
- and
- ΔP1 and ΔP2 are two predetermined values which depend on said limit pressure;
- from said correcting parameter Pc and said set point, an auxiliary set point is calculated for, when it is applied to the electric motor (4), limiting the pressure difference between both chambers (9, 10) of the hydraulic jack (8) to a limit pressure which is lower than an opening pressure of the pressure relief valve (11);
- and
- said auxiliary set point is applied to said electric motor (4) instead of said set point.
62 more elements
Dependencies are inferred from the claim text.