CONTROLLER OF CONSTRUCTION MACHINE - HITACHI CONSTRUCTION MACHINERY

Title:

CONTROLLER OF CONSTRUCTION MACHINE

Document Type and Number:

WIPO Patent Application WO/2012/050136

Kind Code:

A1

Abstract:

This controller comprises: a target rotation speed setting unit (29) for setting the target rotation speed of an engine (2) as the idle rotation speed lower than the input rotation speed that is input by an engine control dial (13) when an operation signal is not output from an operation lever (9) for a predetermined time; and a rotation speed control unit (23) for controlling the rotation speed of the engine on the basis of the target rotation speed set by the target rotation speed setting unit. The target rotation speed setting unit (29) includes an idle rotation speed setting unit (42) for correcting the idle rotation speed according to detection values of sensors (27, 28, 30) in order to suppress the reduction in output of the engine caused by the change in state quantity related to the environment where the engine is disposed. It is thus possible to maintain the good operation feeling at the time of returning from the auto-idle state even when the engine output is reduced due to the change in environment.

Inventors:

NARAZAKI AKIHIRO (JP)
KARASAWA HIDEO (JP)
NAKAMURA TSUYOSHI (JP)

Application Number:

PCT/JP2011/073439

Publication Date:

April 19, 2012

Filing Date:

October 12, 2011

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)
NARAZAKI AKIHIRO (JP)
KARASAWA HIDEO (JP)
NAKAMURA TSUYOSHI (JP)

International Classes:

F02D29/04; F02D29/00; F02D45/00

Foreign References:

JPH0968169A	1997-03-11
JPH01155044A	1989-06-16
JPH01200041A	1989-08-11
JPH02125946A	1990-05-14
JP2002256932A	2002-09-11

Other References: