Title:
CONTROLLER FOR EXCAVATORS
Document Type and Number:
WIPO Patent Application WO/1997/008395
Kind Code:
A1
Abstract:
In order to improve the durability of a tooth edge of an excavator and thereby an excavation efficiency thereof as well, a penetration force control unit (70) controls a hydraulic winch HWD so that a detected penetration force attains a set level, whereby the speed of the excavator (10) is controlled. A descending speed control unit (50) is adapted to control the hydraulic winch HWD so that a detected descending speed attains a set level, whereby the speed of the excavator (10) is controlled. When a detected level of the descending speed exceeds a predetermined level during a control operation of the penetration force control unit (70), a selection unit (80) shifts the control operation to that by the descending speed control unit (50). The descending speed control unit (50) is adapted to control the descending speed by a proportional integration control operation, while the penetration force control unit (70) is adapted to control the penetration force by a proportional differentiation control operation.
Inventors:
FUNATO KOUJI
Application Number:
PCT/JP1996/002431
Publication Date:
March 06, 1997
Filing Date:
August 30, 1996
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
B66D1/44; E02F3/20; E02F3/26; E02F5/02; E02F9/22; (IPC1-7): E02F5/14; E02F5/02; B66D1/44
Foreign References:
| JP3080216B2 | 2000-08-21 | |||
| JPH0595988U | 1993-12-27 | |||
| JPH0726414B2 | 1995-03-22 | |||
| JP7086243B2 | 2022-06-17 | |||
| JPH06322768A | 1994-11-22 |
Other References:
See also references of EP 0790356A4
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