Harvesters – Motorized harvester – With condition-responsive operation
Patent
1982-01-15
1984-02-14
Mancene, Gene
Harvesters
Motorized harvester
With condition-responsive operation
56DIG15, 137117, 251129, A01D 6900
Patent
active
044308469
ABSTRACT:
The present invention provides an electrohydraulic control, which includes both an electrohydraulic valve (36) and an electronic control (382). The electronic control includes an offsetting circuit (622) and is effective to produce an effective driving voltage, for an electrical force-motor (52) of the electrohydraulic valve, that is pulse-width-modulated and that is greater than a fixed proportionality to an input signal (410) by a manually adjustable offset voltage. The offset voltage may be adjusted to produce a null force that exactly balances a spring (129) which presses the valve spool (54) to an overlapped position; so that fluid flow is proportional to an input signal irrespective of the initial load of the spring. When used in conjunction with a ground-speed sensor (380) to control the reel drive on an agricultural harvesting machine, the offset voltage is set higher than a null voltage; so that the resultant rate of fluid flow produces a tangential velocity of the reel that is always greater than the ground speed of the machine.
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Lautzenhiser Lloyd L.
Presley Glen T.
Electro-Hydraulic Controls, Inc.
Mancene Gene
Miller Wendell E.
Tarnoff David L.
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