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:
Feb. 09, 2021
Filed:
Dec. 26, 2017
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Yuichi Ogawa, Tsuchiura, JP;
Shinya Imura, Toride, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
It is made possible to suppress variations of the speed of an actuator into which a regeneration flow rate flows, regardless of variations of the regeneration flow rate caused by posture changes of the front part and to enhance the operability when the front part moves in the free fall direction, and hydraulic fluid discharged from an actuator driving the front part is regenerated. Accordingly, a controllerof a hydraulic system is provided with a regeneration control calculation section, and a pump flow rate control calculation section, and when the regeneration control calculation section controls a regeneration valveto perform regeneration, the pump flow rate control calculation section controls a pump flow rate regulation deviceto increase the delivery flow rate of a hydraulic pumpas the angle of an armapproaches the vertically downward direction based on posture information about the armacquired by an inertial measurement unit