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:
Mar. 24, 2026
Filed:
Mar. 10, 2023
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Ryousuke Itou, Tsuchiura, JP;
Hiroaki Amano, Tsukuba, JP;
Kento Kumagai, Ami-machi, JP;
Shinji Nishikawa, Kasumigaura, JP;
Akihiro Narazaki, Tsukuba, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
The present invention aims to provide a working machine capable of improving the responsiveness of the driving speed to the target speed of the hydraulic actuator. For this purpose, the controller calculates the target speed of the boom according to the input amount of the operation lever, calculates the actuator target flow rate based on the target speed, calculates the pump target flow rate based on the actuator target flow rate, and based on the input amount of the operation lever, the output value of the inertia measuring device, and the meter-out pressure of the actuator, calculates the target meter-in pressure, which is the target value of the actuator's meter-in pressure, calculates the difference between the driving speed of the boom and the target speed as a speed error, calculates the difference between the meter-in pressure and the target meter-in pressure as a pressure error, and corrects the pump target flow rate according to the speed error and the pressure error.