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1. (WO2017154220) CONSTRUCTION MACHINERY

Pub. No.:    WO/2017/154220    International Application No.:    PCT/JP2016/057877
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Mar 12 00:59:59 CET 2016
IPC: F15B 11/00
E02F 9/22
Applicants: HITACHI CONSTRUCTION MACHINERY CO., LTD.
日立建機株式会社
Inventors: HOSHINO Masatoshi
星野 雅俊
TSURUGA Yasutaka
釣賀 靖貴
TAKAHASHI Kiwamu
高橋 究
HIJIKATA Seiji
土方 聖二
Title: CONSTRUCTION MACHINERY
Abstract:
Provided is construction machinery capable of reducing load torque during engine startup, even when the engine is stopped against a driver's will. A hydraulic shovel includes a control device (35) including a pump capacity control unit (37) and an unload control unit (38). When the engine speed of an engine (14) detected by an engine speed sensor (41) becomes equal to or lower than a low-speed engine speed N3 set in advance during the driving of the engine (14), the pump capacity control unit (37) controls a regulator device (20) so as to change the capacity of a hydraulic pump (16) to a minimum capacity. When starting the engine (14), the unload control unit (40) controls an unload valve (24) so as to be set to an open position.