Title:
HYDRAULIC WORK MACHINE
Document Type and Number:
Japanese Patent JP2019044933
Kind Code:
A
Abstract:
To provide a hydraulic work machine capable of improving initial responsiveness of a hydraulic actuator while securing an energy saving property, the hydraulic work machine being configured to increase/decrease a discharge flow rate of a hydraulic pump in response to an operation amount of an operation lever.SOLUTION: A hydraulic shovel comprises a controller 20 for calculating an actuator target flow rate that is a target value of a flow rate to be supplied to hydraulic actuators 5a, 6a and 7a in accordance with operation amounts of operation levers 15a, 16a and 17a, calculating a pump target flow rate that is a target value of a discharge flow rate of hydraulic pumps 30 and 31 in accordance with the actuator target flow rate, and controlling the discharge flow rate of the hydraulic pumps in accordance with the pump target flow rate. In the hydraulic shovel, the controller corrects the pump target flow rate by adding a predetermined correction flow rate that is greater than a pump minimum flow rate of the hydraulic pumps, to the pump target flow rate until the lapse of a predetermined correction time after operation of the operation levers from a neutral position.SELECTED DRAWING: Figure 2
Inventors:
TANAKA HIROAKI
SAKAMOTO HIROSHI
SAKAMOTO HIROSHI
Application Number:
JP2017171567A
Publication Date:
March 22, 2019
Filing Date:
September 06, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/02; E02F9/22; F15B11/16
Domestic Patent References:
| JPH07139510A | 1995-05-30 | |||
| JP2017057556A | 2017-03-23 | |||
| JP2017137968A | 2017-08-10 | |||
| JP2017110774A | 2017-06-22 | |||
| JP2004225868A | 2004-08-12 | |||
| JPH11336701A | 1999-12-07 | |||
| JPH11315806A | 1999-11-16 | |||
| JPH05215101A | 1993-08-24 | |||
| JPH05195546A | 1993-08-03 |
Foreign References:
| WO2014061741A1 | 2014-04-24 |
Attorney, Agent or Firm:
Kaichi International Patent Office