Title:
SYSTEM FOR DRIVING A BOOM OF A HYBRID EXCAVATOR, AND METHOD FOR CONTROLLING SAME
Document Type and Number:
WIPO Patent Application WO/2011/078586
Kind Code:
A3
Abstract:
Disclosed are a system for driving a boom of a hybrid excavator, and a method for controlling same. The disclosed system comprises: an electric motor (110) operating by means of a motor or generator; a capacitor (115) for storing electricity generated by the electric motor (110); a hydraulic pump motor (120) driven by the electric motor (110) to supply working oil to a boom (100); a boom control valve (125) having a closed circuit for selectively connecting/disconnecting a discharge line (121) and an inlet line (122) of the hydraulic pump motor (120) to/from a head (106) or a load (107) of the boom (100); a main pump (140) driven by a driving source (141) arranged separately from the motor (110) so as to supply working oil to a bucket, driving motor, or arm; a boom-assisting valve (144), which connects a discharge line of the main pump (140) to the discharge line (121) of the hydraulic pump motor (120), such that working oil discharged from the main pump (140) and the hydraulic pump motor (120) can be combined; and a control unit (160) for controlling the electric motor (110), the hydraulic pump motor (120), and the boom control valve (125). The system of the present invention minimizes the loss of energy during excavation, which is the main use of an excavator, while using the electric motor, ensures the operating performance of the boom, and recovers regenerative energy from the boom.
Inventors:
KANG BYUNG IL (KR)
Application Number:
PCT/KR2010/009236
Publication Date:
November 24, 2011
Filing Date:
December 23, 2010
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
KANG BYUNG IL (KR)
KANG BYUNG IL (KR)
International Classes:
E02F9/14; E02F9/20; E02F9/22; F15B13/044
Foreign References:
| KR950003826Y1 | 1995-05-16 | |||
| JPH09125449A | 1997-05-13 | |||
| JP2007217992A | 2007-08-30 | |||
| US20090077837A1 | 2009-03-26 |
Other References:
See also references of EP 2518218A4
Attorney, Agent or Firm:
KIM, Kee Hyo et al. (Kukdong Building60-1 Chungmuro3-ka, Chung-ku, Seoul 100-705, KR)
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Claims:
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