Motor vehicles – Having four wheels driven – With means for steering all driven wheels
Patent
1981-03-05
1983-02-15
Peters, Jr., Joseph F.
Motor vehicles
Having four wheels driven
With means for steering all driven wheels
172 3, 172 7, 180140, 180141, 280446A, B60D 114, B62D 902
Patent
active
043736033
ABSTRACT:
A steering control system for automatically positioning the drive wheels of a tractor for crab steering in response to implement side draft. The steering system includes a conventional control device that produces output signals that are a function of the angular positions of the front and rear tractor wheels. The control device has a movable selector switch associated therewith which conditions the steering system for various modes of operation including automatic crab steering. In this mode of operation, a control signal from the implement draft arms is integrated into the conventional steering system control device for operating or turning the drive wheels to a crab position thereby counteracting implement side draft. Sensors are provided for detecting any changes in side draft force applied by the implement to the tractor draft arms. A variance in the control signal from the draft arm sensors in response to implement side draft is translated to the control device for the steering system for causing actuation of an appropriate control valve and operation of hydraulic motors to turn the tractor drive wheels to a crab position.
REFERENCES:
patent: 3516498 (1970-06-01), Schowalter
patent: 3903983 (1975-09-01), Yeske
patent: 4175638 (1979-11-01), Christensen
J. I. Case Company
McGiehan Donn
Peters Jr. Joseph F.
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