Title:
POSITIONING CONTROLLER FOR WORKING MACHINE OF CONSTRUCTION VEHICLE
Document Type and Number:
Japanese Patent JPS5445469
Kind Code:
A
Abstract:
PURPOSE:To control a working machine such as a power shovel by optimum value, by dividing the properties of the machine to dirctions and selectively picking out the properties by direction signals. CONSTITUTION:A position setting unit 1 is set at a predetermined boom height H. When a boom 12 is in possition lower than the set height H, a control circuit 13 generates a boom elevating direction signal es and a difference signal eepsilon between a position signal e'alpha and a setpoint signal ealpha. A flow rate control signal eu is selectively taken out from a flow rate control signal generator 14 throug a switch 16 in accordance with the elevating direction signal. A hydraulic control valve 5 opens in response to the signal eu to supply a working oil to a cylinder 11 to drive it and thereby elevate the boom 12. The difference signal eepsilon falls because of the elevation of the boom 12. The flow rate of the working oil also falls. Therefore, the ascending speed of the boom 12 is reduced.
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Inventors:
IGARASHI MICHIAKI
HONMA NORIKAZU
HONMA NORIKAZU
Application Number:
JP11135277A
Publication Date:
April 10, 1979
Filing Date:
September 16, 1977
Export Citation:
Assignee:
KOMATSU MFG CO LTD
International Classes:
F15B9/09; E02F3/84; E02F3/85; E02F9/20; G05B11/36; (IPC1-7): E02F3/85; E02F9/20; F15B9/09; G05B11/36