Title:
METHOD FOR CONTROLLING HYDRAULIC PUMP OF HYBRID CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/157995
Kind Code:
A1
Abstract:
The present invention relates to a method for controlling a hydraulic pump of a hybrid construction machine, the method comprising: a torque computing step (s10) for calculating a swing motor torque (T) by multiplying a control current value (Is) of a swing motor (60) by a motor constant (Km); an output calculating step (s20) for calculating a swing motor output (Ps) by multiplying the swing motor torque (T) by the rotation speed (W) of the swing motor (60); an equivalent pump flow rate calculating step (s30) for calculating an equivalent pump flow rate (Qep) by dividing the swing motor output (Ps) by the discharge pressure (Pp) of a hydraulic pump (30); an equivalent swing flow rate calculating step (s40) for calculating an equivalent swing flow rate (Qes) by multiplying the rotation speed (W) of the swing motor (60) by a swing hydraulic motor volume (Ds) of an engine-type excavator; a determined flow rate setting step (s50) for setting, as a determined flow rate (Qr), a greater number between the equivalent swing flow rate (Qes) and the equivalent pump flow rate (Qep) when a sign from the swing motor output (Ps) is a positive number and setting "0" as the determined flow rate (Qr) when the sign from the swing motor output (Ps) is a negative number; a determined pressure calculating step (s60) for calculating a determined pressure (Pf) by substituting the determined flow rate (Qr) for a pump horsepower control diagram; and a determined current value deriving step (s70) for calculating a determined control current value (le) by substituting the determined pressure (Pf) for a current-pressure control diagram, wherein the determined current value (le) controls an electronic proportional control valve of the hydraulic pump (30).
Inventors:
YOO SEUNG JIN (KR)
Application Number:
PCT/KR2014/002680
Publication Date:
October 02, 2014
Filing Date:
March 28, 2014
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
International Classes:
E02F9/22; F02D29/04
Foreign References:
| KR20120123095A | 2012-11-07 | |||
| KR20120018298A | 2012-03-02 | |||
| KR20120085598A | 2012-08-01 | |||
| JP2010261539A | 2010-11-18 | |||
| KR101155785B1 | 2012-06-12 |
Attorney, Agent or Firm:
HANBEOT PATENT & LAW FIRM (KR)
특허법인 한벗 (KR)
특허법인 한벗 (KR)
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