CONSTRUCTION MACHINERY - HITACHI CONSTRUCTION MACH CO

Title:

CONSTRUCTION MACHINERY

Document Type and Number:

WIPO Patent Application WO/2018/174084

Kind Code:

A1

Abstract:

Provided is construction machinery that can achieve good operability during a jack up operation regardless of vehicle weight. This controller 21 has: a storage unit 212 that stores a first relationship between the amount of manipulation of an operation lever 15A and a target delivery pressure of a hydraulic pump 33 preset for each vehicle weight; a target delivery pressure arithmetic logic unit 213 that calculates a target delivery pressure of the hydraulic pump 33 by applying the vehicle weight input with an input device 22 and the amount of manipulation of the operation lever 15A corresponding to the pilot pressure detected by a pilot pressure sensor 38A, 38B to the first relationship in the storage unit 212; and a feedback control unit 214 that controls feedback of a center bypass switching valve 40 so that the delivery pressure of the hydraulic pump 33 detected with a delivery pressure sensor 39 matches the target delivery pressure of the hydraulic pump 33 calculated with the target delivery pressure arithmetic logic unit 213.

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Inventors:

KARASAWA HIDEO (JP)
KODAKA KATSUAKI (JP)

Application Number:

PCT/JP2018/011159

Publication Date:

September 27, 2018

Filing Date:

March 20, 2018

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

E02F9/22

Domestic Patent References:

WO2016169939A1

2016-10-27

Foreign References:

JP2013170696A	2013-09-02
JP2009281062A	2009-12-03
JP2010230039A	2010-10-14
JP2012052583A	2012-03-15

Other References: