WORK MACHINE - HITACHI CONSTRUCTION MACH CO

Title:

WORK MACHINE

Document Type and Number:

WIPO Patent Application WO/2021/200244

Kind Code:

A1

Abstract:

Provided is a work machine enabled for speeding up the operating speed of an actuator by means of a regeneration function, while maintaining the positional control accuracy of the actuator.　A controller: computes a regeneration flow rate on the basis of an amount of operation-lever input and a target actuator flow rate; subtracts the regeneration flow rate from the target actuator flow rate to compute a target actuator supply flow rate; computes a target-flow-rate control valve opening amount on the basis of the target actuator supply flow rate; computes a target pump flow rate that is greater than or equal to a total of the target actuator supply flow rate; controls a changeover valve on the basis of the amount of operation-lever input; controls a flow rate control valve according to the target-flow-rate control valve opening amount; and controls a hydraulic pump according to the target pump flow rate.

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Inventors:

KUMAGAI KENTO (JP)
IMURA SHINYA (JP)
TSURUGA YASUTAKA (JP)
CHIBA TAKAAKI (JP)
AMANO HIROAKI (JP)
NISHIKAWA SHINJI (JP)
NARAZAKI AKIHIRO (JP)
SUGIYAMA GENROKU (JP)
YAMAMOTO SHINJIRO (JP)

Application Number:

PCT/JP2021/011253

Publication Date:

October 07, 2021

Filing Date:

March 18, 2021

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

E02F9/20; F15B11/024; F15B11/042; F15B11/08

Domestic Patent References:

WO2017110167A1	2017-06-29
WO2019220872A1	2019-11-21

Foreign References:

JP2016075302A	2016-05-12
JP2014074433A	2014-04-24
JPH07158604A	1995-06-20
JP3056254B2	2000-06-26
JPS594680B2	1984-01-31
JP2018003516A	2018-01-11

Other References: