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Patent Searching and Data


Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039926
Kind Code:
A1
Abstract:
Provided is a construction machine in which lug down of an engine can be suppressed regardless of the operation content of an operator and the load state of a hydraulic actuator. On the basis of a required flow rate of the hydraulic actuator, inlet/outlet pressures of the hydraulic actuator, a required discharge flow rate of an open-circuit pump, and the outlet pressure of the open-circuit pump, a controller calculates a required torque that is the torque required at the engine from a closed-circuit pump and the open-circuit pump, and when the required torque variation rate that is the variation rate of the required torque exceeds a predetermined variation rate, the controller limits the discharge flow rate of at least one among the open-circuit pump and the closed-circuit pump.

Inventors:
SHIMIZU JURI (JP)
HIRAKU KENJI (JP)
SAITOU TEPPEI (JP)
TAKAHASHI HIROMASA (JP)
Application Number:
PCT/JP2020/032453
Publication Date:
March 04, 2021
Filing Date:
August 27, 2020
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/028; F15B11/08; F15B11/17
Foreign References:
JP2012202219A2012-10-22
JP2015048899A2015-03-16
JP2017106251A2017-06-15
JP2007051781A2007-03-01
US20130098019A12013-04-25
Attorney, Agent or Firm:
KAICHI IP (JP)
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