SYSTEM FOR CONTROLLING CONSTRUCTION MACHINE

WIPO Patent Application WO/2012/153586

A1

A fuel-efficient hydraulic fluid has a viscosity lower than a standard hydraulic fluid and thus demonstrates reduced pressure loss, allowing the speeds of various actuators to be increased in a control system based on a standard model. However, there is no need for increasing the speed beyond that of the standard model, and improved fuel efficiency is preferred. Thus, when a maintenance worker selects a position status item (fuel-efficient hydraulic fluid) using a monitor device (6), an alteration setting function unit (11a) reads a corresponding increase or decrease amount from an alteration setting table (14a) and alters a setting. As a result, the engine speed is reduced by 50 rpm and the pump torque is reduced by 5%. Consequently, when the engine output is suppressed and the hydraulic fluid is exchanged from the standard hydraulic fluid to the fuel-efficient hydraulic fluid, fuel efficiency can be improved while maintaining operability equivalent to the standard model. Therefore, when a position that affects fuel efficiency is exchanged, fuel efficiency can be improved while maintaining operability, and further, the setting can be easily altered.

SAWADA SHINGO (JP)
ISHIKAWA KOUJI (JP)
SATAKE HIDETOSHI (JP)
NISHIKAWA SHINJI (JP)
OOKI TAKATOSHI (JP)

PCT/JP2012/059405

November 15, 2012

April 05, 2012

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HITACHI CONSTRUCTION MACHINERY (JP)
SAWADA SHINGO (JP)
ISHIKAWA KOUJI (JP)
SATAKE HIDETOSHI (JP)
NISHIKAWA SHINJI (JP)
OOKI TAKATOSHI (JP)

E02F9/22; E02F9/26; F02D29/00; F02D29/04; F15B21/04

WO2001073218A1	2001-10-04
WO2006035589A1	2006-04-06

JPH10237904A	1998-09-08
JPH0657787A	1994-03-01
JP2010022239A	2010-02-04
JP2002188177A	2002-07-05
JPH0893520A	1996-04-09

See also references of EP 2708662A4

KASUGA Yuzuru (JP)
Kasuga 讓 (JP)

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