Deere + Company

Byron Keith Miller

Benjamin M Lovett

Frederick William Nelson

Troy Eugene Schick

Benedikt Jung

Philipp Muench

Austin M Laugen

Jonathan Lee Engelstad

Patrick Wilson Cross

James William Riesterer

Jeffrey David Dawson

Robert Carl Blad

Matthew L Spencer

Philipp Münch

The height of a header of a self-propelled harvesting machine is controlled by a closed loop header position control system. A sensitivity control system receives parameters related to header position error (e.g., an accuracy parameter) and machine stability (e.g., a stability parameter) and automatically identifies a sensitivity metric indicative of a sensitivity with which the header position control system controls the header height, based upon the received parameters. The sensitivity metric is provided to the header position control system. The header position control system performs closed loop header position control with a sensitivity level based upon the sensitivity metric provided by the sensitivity control system.

Header position control with dynamically adapted sensitivity

An arrangement for the control of an actuator () for the adjustment of an adjustable element () of an agricultural work machine () is equipped with a control unit () to produce adjustment signals for the adjustable element () in the sense of moving to a theoretical position, a control arrangement () of the actuator (), coupled with the adjustable element (), which receives the adjustment signals of the control unit (), and a determination device () to make available at least one parameter (&#x3d1;), determined with the aid of recorded vibration characteristics of the system consisting of the adjustable element () and the work machine (). The determination device () can be operated so as to determine at least one parameter (&#x3d1;) at the successively following time points and to supply it to the control unit (). The parameter (&#x3d1;) serves to optimize the regulating behavior of the control unit ().

Automatic determination of the control unit parameters of an arrangement to control an actuator for the adjustment of an adjustable element of an agricultural machine

A control method is provided for an electric motor which drives an apparatus through a gear unit. The method includes generating a gear output and input speed signals, low pass filtering the gear speed signals and subtracting the filtered gear input speed signal from the filtered gear output speed signal to provide a relative speed signal. The method also includes high pass filtering the relative speed signal, multiplying the filtered relative speed signal by damping gain value to generate a backlash compensation torque value, and subtracting the backlash compensation torque value from an apparatus control torque value to generate the desired motor torque value.

Method of backlash compensation

The present invention is a method for controlling a ground vehicle, for automated steering control of the vehicle or the like. The method of the present invention includes using a GPS receiver or the like and an inertial gyro or the like for providing automated steering control of the ground vehicle. A difference between a measured off-track error and a lateral error command is fed into a lateral error control loop, producing a lateral velocity command. Then, a difference between a measured lateral velocity and the lateral velocity command is fed into a lateral velocity control loop, producing a yaw rate command. Finally, a difference between a measured yaw rate, the yaw rate command, and a curved track yaw rate for the intended path of the vehicle is computed and fed into a yaw rate control loop, producing a valve command for steering the ground vehicle on or towards its intended path. Inputs such as measured wheel slip and the like are used to estimate the steering authority of the steered wheels of the vehicle; the estimated steering authority and/or the actions of a user driving the vehicle are used to adjust the gain of the yaw rate control loop.

System and method for controlling a ground vehicle

Row unit lift structure includes electrohydraulic proportional valves connected to an electronic controller which receives inputs from a manual raise/lower switch, a rate response potentiometer, and height control potentiometers in the cab. Signals are also received from row unit height sensing transducers, a tachometer and shaft rotation sensors. When the units are lowered and operational, the controller compares the signals from the height sensing transducers with the signals from the height control potentiometers and sends an electrical control signal to the proportional valves to maintain a selected row unit height. The magnitude of the control signal and thus the rate of correction of height are determined by the rate response potentiometer and the amount of variation between the actual and desired row unit height.

Harvester row unit height control with electrohydraulic proportional valve structure

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Waterloo, IA, United States of America

Byron Keith Miller