CONTROL DEVICE FOR HYDRAULIC MACHINE

WIPO Patent Application WO/2018/194110

A1

In a hydraulic machine such as an excavation/turning work machine utilizing a load-sensing pump control system, the multiplexity of error factors results in a significant variation in the pump control characteristic among multiple hydraulic machines and operation speed characteristic among the multiple hydraulic machines with regard to the individual drive units; therefore, there has been a demand for a device structure that is able to correct this in a simple manner. The present invention provides a control device for a hydraulic machine that uses a storage unit and a computation unit external to the hydraulic machine to carry out a process for calculating a correction factor for a control output value for an electromagnetic proportion valve that generates control pressure, said calculation being carried by bringing the state of engine rotation or operation of a hydraulic actuator into a specific state and detecting error in the hydraulic pump flow rate or, as a substitute for said detection, detecting error in a numerical value that can be easily detected externally, such as the rotation speed of a travel motor.

JP7154814	Working machine and its control method
WO/2021/221799	WORK TOOL COUPLING ASSEMBLY FOR A CONSTRUCTION MACHINE
JP3337939	Description: Hydraulic drive device for construction machinery

SHIROUZU TAKAYUKI (JP)
ITANI MASAHIRO (JP)

PCT/JP2018/016056

October 25, 2018

April 18, 2018

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YANMAR CO LTD (JP)

E02F9/22; F15B11/00

JP2011196116A	2011-10-06
JP2526440Y2	1997-02-19
JP2011247301A	2011-12-08
JPH0276904U	1990-06-13
JP2007225095A	2007-09-06

See also references of EP 3613998A4

YANO INTERNATIONAL PATENT ATTORNEYS OFFICE, P.C. (JP)

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