OIL-PRESSURE CONTROL SYSTEM

Title:

OIL-PRESSURE CONTROL SYSTEM

Document Type and Number:

WIPO Patent Application WO/2013/171801

Kind Code:

A1

Abstract:

An oil-pressure control system for controlling hydraulic oil discharged from a variable-capacity oil-pressure pump using a closed-center control valve actuated on the basis of operation input from an operation device to supply an oil-pressure actuator, and for controlling the actuation of the oil-pressure actuator. Pump capacity detected using a pump capacity detection means, and pump discharge pressure detected using a pump discharge pressure detection means, are used as feedback input; characteristic values determined using the operation input and the feedback input are used as the target value for a control loop; and the oil-pressure pump is controlled by variable capacity control by using a controller provided with: a horsepower control loop using as feedback the feedback input or a calculated value based on the feedback input, a pressure control loop, a flow control loop, and a minimum-pressure maintenance loop. The controller is provided with a selector for selecting any of the plurality of loops in accordance with the operation input and feedback input, selects any of the plurality of loops using the selector, and controls the oil-pressure pump by variable capacity control on the basis of the control value from the selected loop.

Inventors:

YAMAJI KENPEI (JP)

Application Number:

PCT/JP2012/003262

Publication Date:

November 21, 2013

Filing Date:

May 18, 2012

Export Citation:

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Assignee:

YAMAJI KENPEI (JP)

International Classes:

F04B49/06; E02F9/22; F04B49/00; F15B11/00

Foreign References:

JP2007023606A	2007-02-01
JP2009014122A	2009-01-22
JP3781551B2	2006-05-31
JP2007023606A	2007-02-01

Other References: