HYDRAULIC ENERGY RECOVERY APPARATUS OF WORKING MACHINE

Title:

HYDRAULIC ENERGY RECOVERY APPARATUS OF WORKING MACHINE

Document Type and Number:

WIPO Patent Application WO/2019/049436

Kind Code:

A1

Abstract:

According to the present invention, a controller (45) is provided with: an elapsed time measurement unit (47A) which, by means of a reset signal from a reset switch (44), measures the time (tx) elapsed since the initial use of an accumulator (29); a number-of-operations measurement unit (47B) which, by means of a detection signal from a pressure accumulation-side pressure sensor (39), measures the number of operations of the accumulator (29), that is, the number (N) of boom lowerings following a reset; a gas permeation amount estimation unit (47C) which estimates an estimated amount (Qloss) of gas permeation in the accumulator (29); and a sealed gas pressure estimation unit (47D) which calculates an estimated pressure (Pgs) of gas sealed in a gas chamber (29B) of the accumulator (29); and an accumulator degradation determination unit (47E) which determines the degradation state of the accumulator (29) and outputs a determination result.

Inventors:

TAKAHASHI KIWAMU (JP)
HIJIKATA SEIJI (JP)
HOSHINO MASATOSHI (JP)
OGAWA YUICHI (JP)
ISHIKAWA KOUJI (JP)

Application Number:

PCT/JP2018/019335

Publication Date:

March 14, 2019

Filing Date:

May 18, 2018

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

F15B21/14; E02F9/22; F15B1/02

Foreign References:

JP2011006919A	2011-01-13
US20130247999A1	2013-09-26
JP2004162846A	2004-06-10
JP2005003183A	2005-01-06
JP2009019678A	2009-01-29

Other References: