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Title:
DESCENDING HYDRAULIC-CONTROL METHOD, DESCENDING HYDRAULIC-CONTROL SYSTEM AND ENGINEERING MACHINERY
Document Type and Number:
WIPO Patent Application WO/2023/160239
Kind Code:
A1
Abstract:
A descending hydraulic-control method, a descending hydraulic-control system and engineering machinery. The descending hydraulic-control method comprises: acquiring a pressure value of a rodless cavity of a luffing cylinder; when the pressure value is greater than or equal to a preset pressure value, establishing a first control mode for an input current of an electrical proportional control valve, wherein the first control mode comprises a plurality of first control sub-modes; and on the basis of a descending speed of a boom that is selected by a user, selecting a control current of a corresponding first control sub-mode as the input current of the electrical proportional control valve. The descending hydraulic-control method solves the problem of it being difficult to adjust a descending speed of a boom; and by means of the descending hydraulic-control method, different first control sub-modes can be selected according to the requirements of a user, and an input current of an electrical proportional control valve can thus be adjusted, such that a descending speed of a boom can be automatically adjusted, and the boom thus descends at different speeds.

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Inventors:
HUANG MENG (CN)
LU XIAOBING (CN)
LIU QING (CN)
Application Number:
PCT/CN2022/143674
Publication Date:
August 31, 2023
Filing Date:
December 30, 2022
Export Citation:
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Assignee:
SANY MOBILE CRANES CO LTD (CN)
International Classes:
F15B11/042; F15B11/08; F15B13/044
Foreign References:
CN114542534A2022-05-27
CN112551398A2021-03-26
CN102887435A2013-01-23
CN102616660A2012-08-01
CN103133441A2013-06-05
CN103758801A2014-04-30
CN103879891A2014-06-25
CN104986675A2015-10-21
CN205204652U2016-05-04
JP2002226175A2002-08-14
US20190092606A12019-03-28
US20030115866A12003-06-26
Attorney, Agent or Firm:
BEIJING BRIGHT IP AGENCY CO., LTD. (CN)
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