TRAVELING-TYPE HYDRAULIC WORKING MACHINE - HITACHI CONSTRUCTION MACHINERY

Title:

TRAVELING-TYPE HYDRAULIC WORKING MACHINE

Document Type and Number:

WIPO Patent Application WO/2005/012711

Kind Code:

A1

Abstract:

A traveling-type hydraulic working machine has input means (42, 43) for issuing a command for a target speed of an engine (1), first detection means (44, 47) for detecting operating condition of a hydraulic actuator (13) etc., second detection means (45, 46) for detecting operating condition of traveling means, and engine speed control means (48, 51-59) for correcting the target speed of the engine (1) and controlling the speed of the engine, the correction and control being performed when the operating condition of the hydraulic actuator (13) etc. detected by the first detection means (44, 47) and the operating condition of the traveling means detected by the second detection means (45, 46) are each in a predetermined state. When traveling and a work actuator are operated in combination, work can be done based on an engine speed desired by an operator. An engine speed is automatically regulated when a work load changes, and as a result, combined capability of traveling and the work actuator is maintained in an excellent level, enabling efficient work.

Inventors:

NAKAMURA TSUYOSHI (JP)
SUGIYAMA GENROKU (JP)
NAKAMURA KAZUNORI (JP)
HIRATA TOICHI (JP)

Application Number:

PCT/JP2004/011305

Publication Date:

February 10, 2005

Filing Date:

July 30, 2004

Export Citation:

Click for automatic bibliography generation Help

Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)
NAKAMURA TSUYOSHI (JP)
SUGIYAMA GENROKU (JP)
NAKAMURA KAZUNORI (JP)
HIRATA TOICHI (JP)

International Classes:

E02F9/20; E02F9/22; F02D29/02; F02D31/00; F02D41/02; F04B49/06; F15B11/00; (IPC1-7): F02D29/04; E02F9/22; F02D29/00; F04B49/00; F15B11/00

Foreign References:

JPH03286045A	1991-12-17
JPH05295760A	1993-11-09
JPS6462525A	1989-03-09
JPS634131A	1988-01-09

Other References: