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1. (WO2017154187) WORK MACHINE

Pub. No.:    WO/2017/154187    International Application No.:    PCT/JP2016/057681
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 11 00:59:59 CET 2016
IPC: F02D 45/00
Applicants: HITACHI CONSTRUCTION MACHINERY CO., LTD.
日立建機株式会社
Inventors: IMURA Shinya
井村 進也
NISHIKAWA Shinji
西川 真司
EDAMURA Manabu
枝村 学
ISHIKAWA Kouji
石川 広二
HOSHINO Masatoshi
星野 雅俊
ISHIHARA Shinji
石原 新士
Title: WORK MACHINE
Abstract:
Provided is a work machine in which resonance and lug-down do not readily occur and fine adjustments to engine speed are readily made in high-speed ranges, even when between the minimum speed and maximum speed of the engine there is a speed range in which torque rapidly decreases when speed decreases. This work machine is characterized in that speeds that can be set as a target speed exclude a range between a first speed that is higher than the minimum speed of the engine and a second speed that is higher than the first speed and lower than the maximum speed, and the ratio of the change in the target speed relative to the change in the manipulated variable of an engine speed indication device when the engine speed indication device has been moved from a manipulated variable indicating the minimum speed of the engine to a manipulated variable indicating the first speed is greater than the ratio of the change in the target speed relative to the change in the manipulated variable of the engine speed indication device when the engine speed indication device has been moved from a manipulated variable indicating the second speed of the engine to a manipulated variable indicating the maximum speed.