HYBRID EXCAVATOR BOOM ACTUATING SYSTEM AND METHOD FOR CONTROLLING SAME

Title:

HYBRID EXCAVATOR BOOM ACTUATING SYSTEM AND METHOD FOR CONTROLLING SAME

Document Type and Number:

WIPO Patent Application WO/2012/087080

Kind Code:

A3

Abstract:

The present invention relates to a hybrid excavator boom actuating system and to a method for controlling the same. The hybrid excavator boom actuating system comprises: an electric motor serving as a motor or a generator; an ultra capacitor for storing electrical energy generated by the electric motor; a hydraulic pump motor driven by said electric motor to supply working oil to a boom; a boom control valve which has a closed circuit for selectively connecting or disconnecting an outlet line and an inlet line of the hydraulic pump motor to or from a head or a rod side of the boom; a main pump driven by the engine to supply working oil to a bucket, a travel motor or an arm; a motor bypass valve connected to the outlet line and the inlet line to interconnect the outlet line and the inlet line or disconnect the outlet line from the inlet line; and a control unit for controlling the electric motor, the hydraulic pump motor, the boom control valve and the motor bypass valve. According to the present invention, the hydraulic pump motor and the system are prevented from unstably operating and an operating performance of the boom is ensured to recover regenerative energy of the boom during a boom descending operation.

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Inventors:

KANG BYUNG IL (KR)
HONG KI HWAN (KR)

Application Number:

PCT/KR2011/010083

Publication Date:

September 27, 2012

Filing Date:

December 26, 2011

Export Citation:

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Assignee:

DOOSAN INFRACORE CO LTD (KR)
KANG BYUNG IL (KR)
HONG KI HWAN (KR)

International Classes:

E02F9/22; B60K6/38; F02D29/04

Foreign References:

JP2009127643A	2009-06-11
JP2007263160A	2007-10-11
JP2007113756A	2007-05-10
KR980009679U	1998-04-30

Other References: