Login| Sign Up| Help| Contact|

Patent Searching and Data


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 (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HIJIKATA Seiji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HOSHINO Masatoshi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
OGAWA Yuichi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
ISHIKAWA Kouji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/019335
Publication Date:
March 14, 2019
Filing Date:
May 18, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B21/14; E02F9/22; F15B1/02
Foreign References:
JP2011006919A2011-01-13
US20130247999A12013-09-26
JP2004162846A2004-06-10
JP2005003183A2005-01-06
JP2009019678A2009-01-29
Attorney, Agent or Firm:
HIROWA PATENT FIRM (4F. Nishishinjuku Koide Bldg, 1-3 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
Download PDF: