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. 15, 2022
Filed:
Feb. 24, 2017
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
To control a rate of increase of a delivery flow rate of a pump for a swing operation in response to a moment of inertia and an operation amount and to achieve both energy efficiency and operability with respect to the swing operation, a work machine including a swing structuredisposed on an upper portion of a track structure, a work implementdisposed in the swing structure, a swing motor, a hydraulic pump, a regulator, a directional control valve, and an operation devicefurther includes: a target maximum flow rate calculation sectionconfigured to calculate a target maximum flow rate Qmax of the pump to correspond to a swing operation amount Ps; a flow rate rate-of-increase calculation sectionconfigured to calculate a rate of increase dQ of a command flow rate of the hydraulic pumpon a basis of the moments of inertia of the swing structureand the work implementand the swing operation amount Ps; a command flow rate calculation sectionconfigured to calculate a command flow rate Q(t) on a basis of the rate of increase dQ with the target maximum flow rate Qmax set as an upper limit; and an output sectionconfigured to output a command signal Sf to the regulatorcorresponding to the command flow rate Q(t).