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Patent Searching and Data


Title:
PUMP CONTROL SYSTEM FOR WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/061128
Kind Code:
A1
Abstract:
The present invention is provided with: a pump horsepower control valve (22) that applies, in an opposing manner, a first impelling force determining the limit horsepower (F) of a hydraulic pump and a second impelling force caused by a discharge pressure of the hydraulic pump, to a spool, and that controls a pump flow rate so as to not exceed the limit horsepower (F); a target pump flow rate calculation unit (42) that calculates a target pump flow rate on the basis of an operating pressure (px) and a load pressure (py); a target horsepower calculation unit (41) that calculates, from a relation associated with the operating pressure (px), a required horsepower (Freq) corresponding to the operating pressure (px) and calculates a target horsepower (Ftar) on the basis of the required horsepower (Freq); and a pump horsepower control unit (35) that controls the pump horsepower control valve (22) such that the target pump flow rate (Qtar) is discharged by the limit horsepower (F) determined by the pump horsepower control valve (22).

Inventors:
NISHIKAWA Shinji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
IMURA Shinya (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
MORIKI Hidekazu (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
AMANO Hiroaki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2016/078716
Publication Date:
April 05, 2018
Filing Date:
September 28, 2016
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B11/028; E02F9/22; F04B49/06; F15B11/02; F15B11/08
Foreign References:
JP2011157790A2011-08-18
JP2005265002A2005-09-29
Attorney, Agent or Firm:
KAICHI IP (3-16, Nihonbashi-muromachi 4-chome Chuo-k, Tokyo 22, 〒1030022, JP)
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