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Patent Searching and Data


Title:
CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2019/176054
Kind Code:
A1
Abstract:
A power storage device (20) is provided with voltage detectors (25A)-(25C) for detecting cell voltages (VcA)-(VcC), and a controller (26) for controlling the cell voltages (VcA)-(VcC). The controller (26) is provided with: a balancing control unit (27) for performing a balancing control to reduce variation in the cell voltages (VcA)-(VcC); a maximum cell voltage computation unit (28) for computing a maximum cell voltage (Vmax) from among the cell voltages (VcA)-(VcC); a minimum cell voltage computation unit (29) for computing a minimum cell voltage (Vmin) from among the cell voltages (VcA)-(VcC); and an abnormality sensing unit (34) for sensing an abnormality in the power storage device (20) in accordance with whether or not a difference voltage (ΔV) between the maximum cell voltage (Vmax) and the minimum cell voltage (Vmin) is within the range of a reference difference voltage (ΔVstd1), which is established on the basis of a record that the balancing control was performed.

Inventors:
ISHIDA Seiji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
NAYA Itaru (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/010235
Publication Date:
September 19, 2019
Filing Date:
March 15, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
H02J7/02; E02F9/00; H02J7/00
Foreign References:
JP2008118777A2008-05-22
JP2016075567A2016-05-12
JP2014171379A2014-09-18
JP2013118757A2013-06-13
JP2011205803A2011-10-13
JP2010035337A2010-02-12
Attorney, Agent or Firm:
HIROWA PATENT FIRM (4F. Nishishinjuku Koide Bldg, 1-3 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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