Title:
ELECTRIC WORK VEHICLE
Document Type and Number:
WIPO Patent Application WO/2018/163524
Kind Code:
A1
Abstract:
A dump truck (1) is provided with a ground-fault detection device (22) for detecting a ground-fault detection voltage V0, which is a difference between a detection voltage Vp between a positive electrode line (18A) of a DC bus bar (18) and a neutral point N and a detection voltage Vn between the neutral point N and a negative electrode line (18B) of the DC bus bar (18), and detecting a ground fault on the basis of the ground-fault detection voltage V0. The ground-fault detection device (22) comprises: a DC component determination unit (25) for extracting a DC component VLdc from the ground-fault detection voltage V0, and determining a ground fault on the basis of the DC component VLdc; and drive frequency component determination units (26) and (27) for extracting drive frequency components VLiR and VLiL for inverters (17R) and (17L) from the ground-fault detection voltage V0, and determining a ground fault on the basis of the drive frequency components VLiR and VLiL.
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Inventors:
ISHIDA TOSHIHIKO (JP)
Application Number:
PCT/JP2017/042119
Publication Date:
September 13, 2018
Filing Date:
November 23, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
G01R31/02; B60L3/00; B60L50/15; H02M7/48
Foreign References:
| JP2004260974A | 2004-09-16 | |||
| JP2004168149A | 2004-06-17 | |||
| JP2015162998A | 2015-09-07 | |||
| JP2015180162A | 2015-10-08 |
Other References:
See also references of EP 3594701A4
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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