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:
Sep. 10, 2024
Filed:
Sep. 08, 2022
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Teruki Igarashi, Tsuchiura, JP;
Ryohei Fukuchi, Tsukuba, JP;
Yusuke Suzuki, Teruki, JP;
Hiroaki Tanaka, Kasumigaura, JP;
Mitsuhiko Kanehama, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd, Tokyo, JP;
Abstract
A work machine includes: a work device including a plurality of hydraulic actuators and a plurality of driving target members; a posture sensor that senses posture information of the work device; a control valve unit that controls flows of hydraulic operating fluid supplied from the hydraulic pump to the plurality of hydraulic actuators; a plurality of solenoid valves that generate pilot pressure for driving the control valve unit; and a controller that computes a command value of the pilot pressure to be generated by the solenoid valves, and outputs a control signal corresponding to the command value to the solenoid valves. The controller computes a gravitational direction component of an action direction vector of the driving target members on the basis of the posture information sensed by the posture sensor, corrects the command value of the pilot pressure on the basis of the gravitational direction component of the action direction vector when the command value exceeds a predetermined pressure, and outputs the control signal corresponding to the command value after the correction to the solenoid valves.