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Title:
METHOD AND DEVICE FOR OPERATIONAL CONTROL OF HYDRAULIC CYLINDER
Document Type and Number:
Japanese Patent JP2000337305
Kind Code:
A
Abstract:

To avoid collision of a piston to its end of stroke.

A hydraulic cylinder operation control device is arranged so that a movable element 105 is moved under control inside a hydraulic motor 110 and includes a lever device 125 to generate an operator command signal which indicates the desired speed and moving direction for the movable element 105. A position sensor 130 senses the position of the movable element 105 and emits a position signal. An electronic controller 140 receives the operator command signal and the position signal, determines the actual speed of the element 105, and determines the limit value in compliance with the obtained actual speed of the element 105. In addition, the controller compares the size of the operator command signal with the limit value and emits a flow control signal in accordance with the result from comparison. An electronic hydraulic controller 145 receives a flow control signal to control the motion of the element 105 accordingly.


Inventors:
Wirubuuru, Carl Earl
Duffy, John D.
Koofuraa, Douglas W.
Application Number:
JP2000000143786
Publication Date:
December 05, 2000
Filing Date:
May 16, 2000
Export Citation:
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Assignee:
CATERPILLAR INC
International Classes:
F15B11/08; E02F9/22; F15B9/09; F15B11/00; (IPC1-7): F15B11/08; F15B11/00
Domestic Patent References:
JPH06146328A
JPH05196004A
JPH11117346A
JPH0771405A
Attorney, Agent or Firm:
谷 義一 (外2名)