Deere & Company

Judson Paul Clark

Scott Svend Hendron

Alfred Sigmund Smemo

Glenn Owen Scheer

Bryan D Sulzer

William Daniel Robinson

David William Stubben

William Michael Walter

Gladys L Evans

A work vehicle with a tool pivotally attached to a linkage, an actuator for controllably moving the tool about its pivot, and a tilt angle sensor for sensing the absolute angle of the work tool relative to the earth. A controller is adapted to perform an auto-hold function for the tool, automatically maintaining an initial tool orientation by commanding movement of the tool actuator to hold the work tool at about the initial or set absolute angle of the tool. The controller is adapted to discontinue the tool auto-hold function when the operator manipulates a tool command input device affecting tool actuator movement, and resume the tool auto-hold function at the new orientation affected by the operator. Manipulation of an auto-hold command input device allows the operator to selectively enable and disable the tool auto-hold function.

Coordinated linkage system for a work vehicle

The invention comprises a work vehicle, a boom attached to the vehicle, a tool pivotally attached to the boom, an actuator for controllably moving the tool about its pivot, and an angular velocity sensor for sensing the angular velocity of the tool. A controller is adapted to perform a tool auto-hold function, automatically maintaining an initial tool orientation by processing the angular velocity data and commanding movement of the tool actuator to hold the angular velocity at zero. The controller is adapted to discontinue the tool auto-hold function when the operator manipulates a tool command input device affecting tool actuator movement, and resume the tool auto-hold function at the new orientation affected by the operator. Manipulation of an auto-hold command input device allows the operator to selectively enable and disable the tool auto-hold function.

Automatic loader bucket orientation control

A dual path hydrostatic drive system having an electronic auxiliary drive auxiliary drive controller controlling the hydraulic output of left and right variable displacement pumps in response to the speed of the main drive wheels and a speed ratio signal from a speed ratio input control. In addition, the auxiliary drive auxiliary drive controller controls the outputs of the pumps within three basic boundary conditions; a hydraulic pressure boundary condition, a motor speed boundary condition and a power boundary condition. A clutch mode activation switch has two positions for signaling the auxiliary drive auxiliary drive controller to operate in a first mode in which the auxiliary drive system is shut down upon activation of the main clutch or a second mode where the auxiliary drive controller attempts to mirror the operation of the main drive wheels.

Hydrostatic auxiliary drive system

The invention comprises a backhoe with a tool pivotally attached to a dipperstick, an actuator for controllably moving the tool about its pivot, and an angular velocity sensor for sensing the angular velocity of the tool relative to an earth based coordinate system. A controller is adapted to perform a tool auto-hold function, automatically maintaining an initial tool orientation by processing the angular velocity data and commanding movement of the tool actuator to hold the angular velocity at zero. The controller is adapted to discontinue the tool auto-hold function when the operator manipulates a tool command input device affecting tool actuator movement, and resume the tool auto-hold function at the new orientation affected by the operator. Manipulation of an auto-hold command input device allows the operator to selectively enable and disable the tool auto-hold function.

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Dubuque, IA, United States of America

Judson Paul Clark