IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0789222
(2010-05-27)
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등록번호 |
US-8261545
(2012-09-11)
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우선권정보 |
FR-09 02668 (2009-06-03) |
발명자
/ 주소 |
- Babando, Olivier
- Larrieu, Nicolas
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
2 |
초록
▼
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
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).
대표청구항
▼
1. 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 recei
1. 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-λλ=(ΔP-ΔP1)/(ΔP2-ΔP1)λ∈[0,1]wherein: ΔP represents said measured pressure difference; andΔP1 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); andfourth means (23) for applying to said electric motor (4) said auxiliary set point, instead of said set point. 2. The actuator according to claim 1, comprising: fifth means (34) for determining whether the received electric control signal results in generating an increasing pressure difference or a decreasing pressure difference within the hydraulic jack (8); andsixth means (35) for inhibiting application, where needed, of said auxiliary set point to said electric motor (4), when said received electric control signal results in generating a decreasing pressure difference in absolute value. 3. The actuator according to claim 1, comprising filtering means (38) for filtering said pressure difference measured by said first means (17), before being transmitted to said second means (19). 4. The actuator according to claim 1, comprising checking means (41) for checking, before the actuator (I) operates, the consistency of a pressure difference value, measured by said first means (17). 5. A control system for a control surface, in particular a control surface for an aircraft, said system (13 comprising: a control means (14) for generating an electric control signal; andan actuator (1) which receives said electric control signal and which generates a strain on said control surface (15) according to said received electric control signal, wherein said actuator (1) is such as the one specified under claim 1. 6. 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); andat 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-λλ=(ΔP-ΔP1)/(ΔP2-ΔP1)λ∈[0,1]wherein: ΔP represents said measured pressure difference; andΔP1 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); andsaid auxiliary set point is applied to said electric motor (4) instead of said set point. 7. The method according to claim 6, wherein, in order to calculate said auxiliary set point, said set point is multiplied by said correcting parameter. 8. The method according to claim 6, wherein, automatically and repeatedly, it is determined whether the received electric control signal results in generating an increasing pressure difference or a decreasing pressure difference within the hydraulic jack (8); andwhere needed, application of said auxiliary set point is inhibited when said received electric control signal results in generating a decreasing pressure difference in absolute value.
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