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Patent Searching and Data


Title:
CONTROL APPARATUS AND CONTROL METHOD FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2001/036755
Kind Code:
A1
Abstract:
A control apparatus of a construction machine which gives the operator an improved operating feel by enabling the operator to control the flow rate of a pump in accordance with the operator's preference and a load sense feel while suppressing a sharp increase of the operating speed of a hydraulic actuator and the hunting phenomenon induced thereby, a pump flow rate control means (3, 4) which controls the discharge of the hydraulic fluid from hydraulic pumps (51, 52) selects either a first control signal (F1-1(F1-2)) for controlling the discharge of the pump according to the characteristic that the discharge is in inverse proportion to the pressure of the hydraulic fluid in bypass passages (61b, 66c) on the downstream side of supply and exhaust control valves (57-60, 62-65) or a second control signal (F2-1(F2-2)) for controlling the discharge rate of the pump according to the characteristic that the discharge is in proportion to the manipulated varible of an operating member (54).

Inventors:
ONDA KIMIMASA (JP)
Application Number:
PCT/JP2000/007124
Publication Date:
May 25, 2001
Filing Date:
October 13, 2000
Export Citation:
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Assignee:
CATERPILLAR MITSUBISHI LTD (JP)
ONDA KIMIMASA (JP)
International Classes:
E02F9/22; F04B49/06; F15B11/02; F15B11/16; F15B11/17; F15B21/08; (IPC1-7): E02F9/22; F15B11/00
Foreign References:
JPH08177087A1996-07-09
JPH09257001A1997-09-30
JPH08219104A1996-08-27
Attorney, Agent or Firm:
Sanada, Tamotsu (Kichijoji-hirose Building, 5th floor 10-31 Kichijoji-honcho 1-chome Musashino-shi, Tokyo, 180-0004, JP)
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