Carl E Nelson

US Patent:

43736033, Feb 15, 1983

Filed:

Mar 5, 1981

Appl. No.:

6/240698

Inventors:

Carl D. Nelson - Litchfield Park AZ

Assignee:

J. I. Case Company - Racine WI

International Classification:

B60D 114
B62D 902

US Classification:

180236

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.

US Patent:

41627121, Jul 31, 1979

Filed:

Mar 27, 1978

Appl. No.:

5/890326

Inventors:

Carl D. Nelson - Glendale AZ

Assignee:

J. I. Case Company - Racine WI

International Classification:

B60K 1730

US Classification:

180253

Abstract:

A vehicle differential control wherein the two axles and wheels thereon are influential in controlling the differential. Thus, speed sensors are on the two axles and link mechanisms connect the sensors to a valve unit which controls the flow of fluid to the differential and thus controls the operation of the differential and the subsequent speed of the respective axles. Also, the wheels on the axles are steerable wheels, and there is interconnecting mechanism between the wheels and the differential control mechanism so that when the wheels are steered the control mechanism is actuated to again influence the operation of the differential and thus rotate the respective axles accordingly. As such, there is a steering compensated differential controlled device which is both torque and speed sensed, and there is a wheel steering position compensated device which also influences the operation of the differential. The system is such that it assures traction control of all drive wheels at all times.