Title:
HYDRAULIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/230642
Kind Code:
A1
Abstract:
This hydraulic system comprises: an operating device which outputs an operating signal according to a control variable with respect to the operating part; a pump which supplies hydraulic oil to a hydraulic actuator via a control valve; a bleed valve which stipulates the bleed flowrate at which hydraulic oil discharged from the pump is released to a tank; and a control device which controls the bleed valve in such a manner that the opening surface area of the bleed valve is reduced as the operating signal outputted from the operating device increases. The control device varies the opening surface area of the bleed valve between a maximum value and zero along a standard opening line, if sudden acceleration operation is not performed with respect to the operating device; and if a sudden acceleration operation is performed, the opening surface area of the bleed valve is varied between a maximum value and a minimum value that is greater than zero, along a special opening line, from the start of the sudden acceleration operation until a predetermined time period has elapsed.
Inventors:
KONDO AKIHIRO
MURAOKA HIDEYASU
MURAOKA HIDEYASU
Application Number:
PCT/JP2018/022723
Publication Date:
December 20, 2018
Filing Date:
June 14, 2018
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/02; E02F9/22
Foreign References:
| JP2004360898A | 2004-12-24 | |||
| JPH04131510A | 1992-05-06 | |||
| JP2000170212A | 2000-06-20 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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