Title:
SHOVEL AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2015/178316
Kind Code:
A1
Abstract:
A shovel (1) is provided with: a boom cylinder (7) that receives at least one part of hydraulic oil that is discharged by a hydraulic pump (10R) as pump supply oil; a regenerated oil path (33) that causes at least one part of the hydraulic oil that flows out from a bottom-side oil chamber of the boom cylinder (7) to flow into a rod-side oil chamber as regenerated oil; and a controller (54) that controls the discharge flow rate (Qp) of the hydraulic oil that is discharged by the hydraulic pump (10R) and adjusts the boom cylinder inflow rate (Qs). The controller (54) determines the discharge flow rate (Qp) in accordance with the thrust force (F) that acts on the boom cylinder (7) when a boom lowering operation is performed and maximizes a regeneration flow rate (Qg) while setting the pressure of the rod-side oil chamber to be equal to or greater than a predetermined target pressure (Ptg).
Inventors:
KAWASHIMA KOJI (JP)
Application Number:
PCT/JP2015/064091
Publication Date:
November 26, 2015
Filing Date:
May 15, 2015
Export Citation:
Assignee:
SUMITOMO HEAVY INDUSTRIES (JP)
International Classes:
F15B21/14; E02F9/22; F15B11/02; F15B11/024; F15B11/028
Foreign References:
| JP2010078035A | 2010-04-08 | |||
| JP2010286074A | 2010-12-24 | |||
| JP2006070970A | 2006-03-16 | |||
| JP2004076904A | 2004-03-11 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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