Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/003811
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a construction machine capable of suppressing engine lug-down regardless of the content of an operation by an operator or the load state of a hydraulic actuator. A controller 50 has: a requested torque estimation unit 50c which, on the basis of a requested speed of a first hydraulic actuator 1 and a load pressure of the first hydraulic actuator, estimates a requested torque, which is the torque requested from an engine 9 by a first hydraulic pump; a requested speed limiting unit 50d which, when a requested torque change rate, which is the rate of change of the requested torque, exceeds a prescribed change rate, limits the requested speed such that the requested torque change rate is no greater than the prescribed change rate; and a command calculation unit 50e which calculates a discharge flow rate of the first hydraulic pump on the basis of the requested speed of the first hydraulic actuator that has been limited by the requested speed limiting unit.
Inventors:
SHIMIZU JURI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOU TEPPEI (JP)
SUGIKI SHOUHEI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOU TEPPEI (JP)
SUGIKI SHOUHEI (JP)
Application Number:
PCT/JP2019/019879
Publication Date:
January 02, 2020
Filing Date:
May 20, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/028; F15B11/17
Domestic Patent References:
| WO1998006936A1 | 1998-02-19 |
Foreign References:
| JP2015098938A | 2015-05-28 | |||
| JP2017106251A | 2017-06-15 | |||
| JP2010276126A | 2010-12-09 |
Other References:
See also references of EP 3779210A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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