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Title:
CONSTRUCTION MACHINE, DRIVER AND DRIVING PROGRAM THEREFOR
Document Type and Number:
Japanese Patent JP2003033063
Kind Code:
A
Abstract:

To enhance the operability by enabling the shifting of control from torque control to objective velocity to be performed properly, and preventing the sudden change of acceleration/deceleration velocity of an electric actuator, in a construction machine such as a hydraulic power shovel, etc.

According to the drive direction of the electric actuator and according as it is in acceleration or deceleration, in procedures 119, 123, 127 and 131; objective torque Tri1, etc., is obtained from an operation command signal Xi. In procedures 120, 124, 128 and 132; objective torque Tri2, etc., is obtained from a velocity deviation signal ΔVi. In procedures 121, 125, 129 and 133; maximum tolerable torque Tri3, etc., is obtained from a real velocity signal Vi. In procedures 122, 126, 130 and 134; the one the smallest in absolute value is selected among them, and it is made the objective torque Tri0, thus controlling the electric actuator.


Inventors:
AOYANAGI YUKIO
HIRATA TOICHI
OCHIAI MASAMI
OHIRA SHUJI
EGAWA EIJI
Application Number:
JP2001210578A
Publication Date:
January 31, 2003
Filing Date:
July 11, 2001
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F9/20; H02P29/00; (IPC1-7): H02P5/00; E02F9/20
Domestic Patent References:
JP2001010783A2001-01-16
JPH10168929A1998-06-23
JPH10206445A1998-08-07
JPH0287997A1990-03-28
JPH01178624A1989-07-14
JPH04168988A1992-06-17
Attorney, Agent or Firm:
Satoshi Kasuga (1 person outside)



 
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