Title:
CONTROL SYSTEM OF HYBRID CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2015075222
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve fuel safe performance in lowering a load.SOLUTION: A control system of a hybrid construction machine includes: first and second main pumps MP1, MP2; a boom cylinder BC raising a boom by supplying a hydraulic oil to a piston-side chamber 25, and lowering the boom by discharging the hydraulic oil from the piston-side chamber 25; a regenerative control spool valve 26 controlled by a pressure of a pilot pressure oil and adjusting a flow rate of the hydraulic oil discharged from the piston-side chamber 25; a regenerative motor M for regeneration, rotated by the hydraulic oil discharged from the piston-side chamber 25: an electrical rotating machine 35 connected to the regenerative motor M; and a switch valve 60 for fail-safe, switching a pressure of a regeneration passage 27a between the regenerative control spool valve 26 and the regenerative motor M as a pilot pressure, and lowering a pressure of the pilot pressure oil to the regenerative control spool valve 26 to throttle the flow rate of the hydraulic oil discharged from the piston-side chamber 25, when the pressure of the regeneration passage 27a is less than a set pressure.
Inventors:
KAWASAKI HARUHIKO
EGAWA YOSHIHIRO
EGAWA YOSHIHIRO
Application Number:
JP2013213961A
Publication Date:
April 20, 2015
Filing Date:
October 11, 2013
Export Citation:
Assignee:
KAYABA INDUSTRY CO LTD
International Classes:
F15B20/00; E02F9/20; F15B21/14
Domestic Patent References:
| JP2007315514A | 2007-12-06 | |||
| JP2007113754A | 2007-05-10 | |||
| JP2012092546A | 2012-05-17 | |||
| JPH09329106A | 1997-12-22 | |||
| JPH11247236A | 1999-09-14 | |||
| JP2011179541A | 2011-09-15 |
Attorney, Agent or Firm:
Masaki Goto
Masaaki Iida
Atsushi Sudo
Kei Takeda
Masaaki Iida
Atsushi Sudo
Kei Takeda