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Patent Searching and Data


Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2019/176076
Kind Code:
A1
Abstract:
Provided is a construction machine capable of driving each hydraulic actuator at an appropriate speed while suppressing the discharge flow rate of a hydraulic pump during both independent operation in which each hydraulic actuator is independently driven and combined operation in which a plurality of hydraulic actuators are simultaneously driven. A controller calculates a first required pump flow rate for the manipulated amount of each of a plurality of manipulation devices, calculates, for the manipulated amount of each of the plurality of manipulation devices, a second required pump flow rate greater than the first required pump flow rate for the same manipulated amount, selects, as a final required pump flow rate, whichever value is smaller among the sum of the first required pump flow rates calculated for the manipulated amounts of the plurality of manipulation devices and the maximum value among the second required pump flow rates calculated for the manipulated amounts of the plurality of manipulation devices, and controls a regulator so that the discharge flow rate of the hydraulic pump matches the final required pump flow rate.

Inventors:
YAMASHITA RYOHEI (JP)
MORI KAZUSHIGE (JP)
IMURA SHINYA (JP)
Application Number:
JP2018/010352
Publication Date:
September 19, 2019
Filing Date:
March 15, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/08
Foreign References:
JP2013543086A2013-11-28
JP2015036495A2015-02-23
JPH07119709A1995-05-09
Other References:
See also references of EP 3575615A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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