Title:
HYDRAULIC CONTROL DEVICE FOR WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/262076
Kind Code:
A1
Abstract:
Disclosed is a hydraulic control device (20) capable of unerringly determining whether or not a regenerative operation is possible. The hydraulic control device (20) is equipped with: a channel-switching valve (70) for switching a supply channel; a channel-switching control unit for operating the same; a regeneration valve and a regeneration release valve (62) which are capable of performing a regenerative operation; and a regeneration control unit for operating the same. The channel-switching control unit causes the channel-switching valve (70) to form a channel in a manner such that a first and a second pump (21, 22) are alternatingly connected while in a compound operation state. The regeneration control unit determines whether or not a regenerative operation is possible on the basis of the second pump pressure which is the discharge pressure of the second pump (22) while in a solo operation state, and determines whether or not the regenerative operation is possible on the basis of whether or not the drive state of the work actuator (45) is in an allowable range which corresponds to the target work operation amount while in the compound operation state.
Inventors:
NAGAI MASAKI
UEDA KOJI
FUJITA YUICHIRO
UEDA KOJI
FUJITA YUICHIRO
Application Number:
PCT/JP2020/023430
Publication Date:
December 30, 2020
Filing Date:
June 15, 2020
Export Citation:
Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
International Classes:
E02F9/22; F15B11/024; F15B11/02; F15B11/17
Foreign References:
| JPH01320303A | 1989-12-26 | |||
| JPH10267007A | 1998-10-06 | |||
| JP2006329341A | 2006-12-07 |
Other References:
See also references of EP 3967885A4
Attorney, Agent or Firm:
KOTANI, Masataka et al. (JP)
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