FLUID PRESSURE CIRCUIT CONTROL APPARATUS AND WORKING MACHINE

Title:

FLUID PRESSURE CIRCUIT CONTROL APPARATUS AND WORKING MACHINE

Document Type and Number:

WIPO Patent Application WO/2012/091059

Kind Code:

A1

Abstract:

This invention aims at improving the relief pressure precision for the relief setting pressure of an electromagnetic adjustable relief valve provided for controlling the pressure of a fluid pressure actuator. A controller (31) is used to control electromagnetic adjustable relief valves (33) provided for controlling and setting, to the setting pressure that can be electrically commanded, the pressure of hydraulic fluid supplied to an attachment cylinder (15). The control using the controller (31) is achieved by incorporating, into the controller (31), a control logic that enables the controller (31) to output, on the basis of input signals related to the relief setting pressures and relief valve passage flow rates of the electromagnetic adjustable relief valves (33), a command signal, which is related to the relief setting pressures for which the override pressure characteristics of the electromagnetic adjustable relief valves (33) have been corrected, to the electromagnetic adjustable relief valves (33).

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JPH09328025

TENSION ADJUSTER FOR TROLLEY WIRE

Inventors:

NISHIKAWA HIROYASU (JP)
SHIMAHARA SEI (JP)
NAKANISHI MANABU (JP)
SHIBATA MASASHI (JP)

Application Number:

PCT/JP2011/080312

Publication Date:

July 05, 2012

Filing Date:

December 27, 2011

Export Citation:

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Assignee:

CATERPILLAR SARL (CH)
NISHIKAWA HIROYASU (JP)
SHIMAHARA SEI (JP)
NAKANISHI MANABU (JP)
SHIBATA MASASHI (JP)

International Classes:

F15B11/028; E02F9/22; E02F9/24; G05D16/00

Foreign References:

JPH04248060A	1992-09-03
JP2010236607A	2010-10-21
JPS6286919U	1987-06-03
JPH0262221A	1990-03-02
JP2003048016A	2003-02-18
JPH05146900A	1993-06-15

Other References: