Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/051533
Kind Code:
A1
Abstract:
In order to control the increase rate of a pump discharge flow rate for a turning action in response to a moment of inertia and an operation amount, and to achieve both energy efficiency and operability with respect to the turning action, this work machine is provided with: a turning body 2 provided on an upper part of a traveling body 1; a work implement 3 attached to the turning body 2; a turning motor 16; a hydraulic pump 22; a regulator 24; a directional control valve 31; and an operation device 34, wherein the work machine is further provided with: a target maximum flow rate computing unit 53 for computing a target maximum flow rate Qmax of the pump in response to a turning operation amount Ps; a flow rate increase rate computing unit 55 for computing an increase rate dQ of a command flow rate of the hydraulic pump 22 on the basis of the moments of inertia N and the turning operation amounts Ps of the turning body 2 and the work implement 3; a command flow rate computing unit 56 for computing a command flow rate Q(t) on the basis of the increase rate dQ when considering the target maximum flow rate Qmax as an upper limit; and an output unit 57 for outputting a command signal Sf to the regulator 24 in response to the command flow rate Q(t).
Inventors:
MORIKAWA MASATOSHI (JP)
IMURA SHINYA (JP)
NISHIKAWA SHINJI (JP)
IMURA SHINYA (JP)
NISHIKAWA SHINJI (JP)
Application Number:
PCT/JP2017/007242
Publication Date:
March 22, 2018
Filing Date:
February 24, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/22; E02F9/20
Foreign References:
| JP2013532782A | 2013-08-19 | |||
| JPH1136376A | 1999-02-09 | |||
| JP2005016228A | 2005-01-20 | |||
| JPH09144070A | 1997-06-03 | |||
| JPS6375223A | 1988-04-05 | |||
| JP2013532782A | 2013-08-19 |
Other References:
See also references of EP 3514289A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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