HYDRAULIC PRESSURE CONTROL DEVICE FOR MACHINERY - HITACHI CONSTRUCTION MACHINERY

Title:

HYDRAULIC PRESSURE CONTROL DEVICE FOR MACHINERY

Document Type and Number:

WIPO Patent Application WO/2014/073541

Kind Code:

A1

Abstract:

The present invention improves energy efficiency by reducing the throttling-off loss of the delivery flow rate of a hydraulic pump due to bleed-off control and improves operational performance by enabling control of hydraulic pump delivery pressure according to the control input of an operating lever device. A controller (6) comprises a target pump pressure-setting unit (32) for calculating, on the basis of control input signals from control input detectors (20A, 20B), a target pump delivery pressure, which increases as the control input signals increase, and a pump flow rate upper limit-setting unit (33) for calculating, on the basis of the control input signals, the pump flow rate upper limit, which increases as the control input signals increase. The amount of tilt of the hydraulic pump (2) is controlled on the basis of the target pump delivery pressure calculated by the target pump pressure-setting unit (32), the pump flow rate upper limit calculated by the pump flow rate upper limit-setting unit (33), and the delivery pressure of the hydraulic pump (2) detected by a pressure detector (21).

Inventors:

UDAGAWA TSUTOMU (JP)
NAKAYAMA AKIRA (JP)
YAMASHITA RYOHEI (JP)
IZUMI SHIHO (JP)
EDAMURA MANABU (JP)
ISHIKAWA KOUJI (JP)
SATAKE HIDETOSHI (JP)

Application Number:

PCT/JP2013/079930

Publication Date:

May 15, 2014

Filing Date:

November 05, 2013

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)

International Classes:

F15B11/00; E02F9/22; F15B11/02

Foreign References:

JP4096900B2	2008-06-04
JP3745038B2	2006-02-15
JP4434159B2	2010-03-17
JP2011021694A	2011-02-03
JP3745038B2	2006-02-15
JP4096900B2	2008-06-04
JP4434159B2	2010-03-17

Other References: