Device and method for controlling attachment of construction mac

Details Device and method for controlling attachment of construction mac Device and method for controlling attachment of construction mac

1996-07-15

1998-07-28

Nguyen, Hoang

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91459, 91461, F15B 1316, F15B 13044

Patent

active

057849447

ABSTRACT:
A control method and a device to control construction equipment attachments include during manual operation, the pilot pressure discharged from a pilot pump is fed from a manual operation valve through an electromagnetic change valve to a main control valve. During automatic operation, the pilot pressure from an automatic-mode selecting valve is fed through an electromagnetic proportional control valve as well as the electromagnetic change valve, all of which are controlled by a controller, to a main control valve. When the operation range is restrictively set during manual operation, the pilot pressure output from the manual operation valve is fed through the electromagnetic proportional control valve as well as the electromagnetic change valve to the main control valve. Both the main control valve and the electromagnetic proportional control valve are controlled by control signals from the controller. When the equipment attachment approaches the set restriction, the main control valve is returned to a neutral position by the controller causing the electromagnetic proportional control valve to block the pilot pressure.

REFERENCES:
patent: 2235809 (1941-08-01), Farrell
patent: 4194365 (1980-03-01), Stoufflet et al.
patent: 5062264 (1991-11-01), Frenette et al.
patent: 5383390 (1995-01-01), Lukich
patent: 5477770 (1995-12-01), Ono et al.
patent: 5497805 (1996-03-01), Sunamura et al.

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