Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2024/070588
Kind Code:
A1
Abstract:
Provided is a work machine with which it is possible to maintain the balance of operation speeds of a plurality of hydraulic actuators while the output of a motor is restricted. This work machine: computes, on the basis of a predetermined output restriction value for a motor and a discharge pressure of a hydraulic pump as detected by a discharge pressure sensor, a pump flow rate restriction value for a hydraulic oil that can be discharged by the hydraulic pump; computes, on the basis of an operation amount detected by an operation amount detection sensor, a required speed for each of a plurality of hydraulic actuators; computes a pump flow rate estimation value, which is an estimation value pertaining to the flow rate of the hydraulic oil that is to be discharged by the hydraulic pump, so as to satisfy the computed plurality of required speeds; corrects each of the plurality of required speeds, and computes a plurality of target speeds, on the basis of the ratio of the pump flow rate restriction value and the pump flow rate estimation value; and controls the motor, the hydraulic pump, and at least one of a plurality of flow rate control valves such that each of the plurality of actuators acts at a target speed.
Inventors:
AMANO HIROAKI (JP)
KUMAGAI KENTO (JP)
KANEHAMA MITSUHIKO (JP)
KODAKA KATSUAKI (JP)
KUMAGAI KENTO (JP)
KANEHAMA MITSUHIKO (JP)
KODAKA KATSUAKI (JP)
Application Number:
PCT/JP2023/032839
Publication Date:
April 04, 2024
Filing Date:
September 08, 2023
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/22
Domestic Patent References:
| WO2022202898A1 | 2022-09-29 |
Foreign References:
| JP2012158932A | 2012-08-23 | |||
| JPH07189296A | 1995-07-28 | |||
| JP2020002956A | 2020-01-09 | |||
| JP2015040604A | 2015-03-02 | |||
| JP2003113805A | 2003-04-18 | |||
| JP2005226678A | 2005-08-25 | |||
| JP2015197185A | 2015-11-09 | |||
| JPH09189302A | 1997-07-22 |
Attorney, Agent or Firm:
TAKEWA INTERNATIONAL PATENT OFFICE (JP)
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