ACTUATOR DISPLACEMENT MEASUREMENT SYSTEM IN ELECTRONIC HYDRAULIC SYSTEM OF CONSTRUCTION EQUIPMENT

Title:

ACTUATOR DISPLACEMENT MEASUREMENT SYSTEM IN ELECTRONIC HYDRAULIC SYSTEM OF CONSTRUCTION EQUIPMENT

Document Type and Number:

WIPO Patent Application WO/2013/054954

Kind Code:

A1

Abstract:

Disclosed is an actuator displacement measurement system capable of detecting actuator displacement by using characteristics of an electronic hydraulic system. An actuator displacement measurement system according to the present invention comprises the steps of: controlling driving of an electric motor; determining whether to drive the electric motor; determining whether a set pressure value of a relief valve and a measured pressure value of a hydraulic system are large or small if said detected actuator displacement value is deviated from a zero value of a reference position; setting the actuator displacement value as a previous value if the pressure value of the hydraulic system is larger than or the same as the pressure value of the relief valve, and calculating the actuator displacement value by using the rotary speed of the electric motor, a cross sectional area of an actuator, and a feed flow rate of a hydraulic pump if the pressure value of the hydraulic system is smaller than the pressure value of the relief valve; and ending the operation after storing the actuator displacement value calculated up to the present time in a controller if a power-off request of the hydraulic system is received, and moving to the initial step if the power-off request of the hydraulic system is not received.

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Inventors:

KIM JI-YUN (KR)

Application Number:

PCT/KR2011/007534

Publication Date:

April 18, 2013

Filing Date:

October 11, 2011

Export Citation:

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Assignee:

VOLVO CONSTR EQUIP AB (SE)
KIM JI-YUN (KR)

International Classes:

F15B19/00; E02F9/22; F15B21/08; G01B21/00

Domestic Patent References:

WO2007015814A2

2007-02-08

Foreign References:

JP2002323005A	2002-11-08
KR200377929Y1	2005-03-11
JP2008151299A	2008-07-03

Other References:

See also references of EP 2767720A4
None

Attorney, Agent or Firm:

YOON, Eui-Seoup (KR)
윤의섭 (KR)

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