Title:
CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2019/139104
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide construction machinery with which a pressure sensor can be easily and reliably calibrated, and a hydraulic actuator can be reliably controlled. A controller increases a discharge pressure of a hydraulic pump in a state of having closed first and second meter-out valves and a second meter-in valve and having opened a first meter-in valve, calibrates a first pressure calculation map so that a pressure calculated on the basis of the first pressure calculation map coincides with a pressure calculated on the basis of a supply pressure calculation map, increases a discharge pressure of the hydraulic pump in a state of having closed the first and second meter-out valves and the first meter-in valve and having opened the second meter-out valve, and calibrates a second pressure calculation map so that a pressure calculated on the basis of the second pressure calculation map coincides with a pressure calculated on the basis of the supply pressure calculation map.
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Inventors:
MORIKI HIDEKAZU (JP)
CHIBA TAKAAKI (JP)
IMURA SHINYA (JP)
CHIBA TAKAAKI (JP)
IMURA SHINYA (JP)
Application Number:
PCT/JP2019/000603
Publication Date:
July 18, 2019
Filing Date:
January 10, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/028; E02F9/22; F15B11/00; F15B11/042; F15B11/044
Domestic Patent References:
| WO2015129931A1 | 2015-09-03 |
Foreign References:
| JP2002372006A | 2002-12-26 | |||
| JP2007033137A | 2007-02-08 | |||
| JP2011074933A | 2011-04-14 | |||
| JP2003074296A | 2003-03-12 | |||
| US20090277243A1 | 2009-11-12 | |||
| JP2008267450A | 2008-11-06 | |||
| JP2010502948A | 2010-01-28 | |||
| JP2005098504A | 2005-04-14 |
Other References:
See also references of EP 3739220A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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