Title:
HYDRAULIC CONTROL DEVICE AND HYDRAULIC CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2013/042484
Kind Code:
A1
Abstract:
The present invention is a hydraulic control device that controls a hydraulic pump in a construction machine for which a hydraulic actuator is connected to the hydraulic pump via a closed-center type direction-switching valve, and the position of the direction-switching valve is changed in response to the amount of operation of an operating member, this hydraulic control device being characterized in that it is equipped with: a hypothetical negative control pressure calculation means which, on the basis of the amount of operation of the operating member and the discharge pressure of the hydraulic pump, calculates a hypothetical negative control pressure which assumes a negative control system; and a means that calculates a control command value for the hydraulic pump on the basis of the hypothetical negative control pressure.
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Inventors:
MATSUZAKI EISUKE (JP)
Application Number:
PCT/JP2012/070388
Publication Date:
March 28, 2013
Filing Date:
August 09, 2012
Export Citation:
Assignee:
SUMITOMO HEAVY INDUSTRIES (JP)
MATSUZAKI EISUKE (JP)
MATSUZAKI EISUKE (JP)
International Classes:
F15B11/00; E02F9/22
Foreign References:
| JPH11303809A | 1999-11-02 | |||
| JPH06280810A | 1994-10-07 | |||
| JPH01275902A | 1989-11-06 | |||
| JP2012137159A | 2012-07-19 | |||
| JP2012031998A | 2012-02-16 | |||
| JPH11158941A | 1999-06-15 | |||
| JPH1047306A | 1998-02-17 |
Other References:
See also references of EP 2759713A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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Claims:
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