Method and apparatus for controlling an implement of a work mach

Details Method and apparatus for controlling an implement of a work mach Method and apparatus for controlling an implement of a work mach

1996-06-24

1998-04-14

Nguyen, Hoang

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91459, 60426, 60327, F15B 1316

Patent

active

057379939

ABSTRACT:
An apparatus for controllably moving a work implement is disclosed. The implement is connected to a work machine and is moveable in response to operation of a hydraulic cylinder. The apparatus includes an operator controlled joystick. A joystick position sensor senses the position of the joystick and responsively generates an operator command signal, which is indicative of a desired velocity. A velocity sensor senses the velocity of the lift cylinder and tilt cylinders and responsively producing respective cylinder velocity signals. A microprocessor receives the cylinder velocity and operator command signals, determines the difference between the actual and desired cylinder velocity, and responsively produces an electrical valve signal in response to the velocity difference. An electrohydraulic valve receives the electrical valve signal, and controllably provides hydraulic fluid flow to the hydraulic cylinder in response to a magnitude of the electrical value signal.

REFERENCES:
patent: 4336745 (1982-06-01), Lund
patent: 4852657 (1989-08-01), Hardy et al.
patent: 5189940 (1993-03-01), Hosseini et al.
patent: 5218895 (1993-06-01), Lukich et al.
patent: 5305681 (1994-04-01), Devier et al.
patent: 5333533 (1994-08-01), Hosseini
patent: 5511458 (1996-04-01), Kamata et al.
U.S. Patent Application Serial No. 08/498,558, filed Jul. 5, 1995. Title: Control System for a Hydraulic Cylinder and Method.

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