The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 2024
Filed:
Dec. 08, 2020
Sumitomo Precision Products Co., Ltd., Hyogo, JP;
Shogo Hagihara, Hyogo, JP;
Takaaki Onishi, Hyogo, JP;
SUMITOMO PRECISION PRODUCTS CO., LTD., Hyogo, JP;
Abstract
An EHA system () for lifting or lowering a leg of an aircraft includes a hydraulic circuit () having a hydraulic actuator (a hydraulic cylinder) configured to lift or lower the leg, at least one electric hydraulic pump (), and a hydraulic path, a pressure sensor (), a temperature sensor (), and a control unit (a controller) configured to output a control signal for operating the electric hydraulic pump in leg lifting or lowering. The hydraulic circuit includes a pressure increasing element. The control unit performs health monitoring regarding the performance of the electric hydraulic pump based on the pressure of hydraulic fluid, the temperature of hydraulic fluid, and the speed of the electric hydraulic pump during operation of the electric hydraulic pump.