Title:
HYDRAULIC DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/199290
Kind Code:
A1
Abstract:
This hydraulic drive system is provided with a flow rate control valve device, a bleed-off valve device, a discharge pressure sensor, a relief valve, an operating element, and a control device. The control device: detects a discharge pressure using the discharge pressure sensor by varying an actuation command current which flows to the flow rate control valve device in a state in which a hydraulic pump and a tank are isolated from one another by means of the bleed-off valve device; detects at least one electric current from among an opening start time current in the flow rate control valve device when opening starts, or a closure completion time current when closure is complete, on the basis of the detected discharge pressure and a relief pressure; and executes a calibration process to adjust a correspondence relationship between an operation quantity of the operating element and the detected at least one current, on the basis of said at least one current.
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Inventors:
MURAOKA HIDEYASU
NOSE TOMOMICHI
NOSE TOMOMICHI
Application Number:
PCT/JP2018/017197
Publication Date:
November 01, 2018
Filing Date:
April 27, 2018
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B19/00; E02F9/20
Foreign References:
| JP2017057926A | 2017-03-23 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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