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:
Aug. 27, 2019
Filed:
Oct. 06, 2017
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Eisuke Matsuzaki, Kanagawa, JP;
SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A shovel is disclosed, which includes a lower traveling body; an upper rotating body mounted on the lower traveling body; an engine mounted on the upper rotating body; a hydraulic pump of a variable volume type; a hydraulic actuator to which pressurized oil is supplied from the hydraulic pump; a flow rate control valve configured to control, based on operation amount of an operation member, a flow rate of the oil to the hydraulic actuator from the hydraulic pump; and a controller configured to control the hydraulic pump. The controller calculates a virtual bleed flow rate from a bleed opening area of the flow rate control valve, determines a pump demand flow rate based on the calculated virtual bleed flow rate, and performs a virtual bleed-off control such that a discharge flow rate of the hydraulic pump becomes the determined pump demand flow rate.