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:
Jul. 24, 2018
Filed:
Dec. 12, 2016
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Ryouhei Yamashita, Tsuchiura, JP;
Shinya Imura, Toride, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hydraulic control system for a construction machine has a hydraulic actuator that drives an arm, a meter-out channel through which hydraulic fluid discharged from the hydraulic actuator flows, a variable restrictor provided in the meter-out channel, an operating device, and a controller that controls an opening area of the variable restrictor. A posture calculation unit calculates an angle made by the arm with respect to a horizontal direction, a meter-out opening area calculation unit calculates the opening area of the variable restrictor based on the angle made by the arm with respect to the horizontal direction and a time rate of change of the angle, and a meter-out control unit outputs a command signal to a solenoid valve used for adjusting the opening area of the variable restrictor, based on the opening area of the variable restrictor calculated by the meter-out opening area calculation unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile