Deere + Company

Patrick Wilson Cross

David August Johnson

Robert Alan Henson

Eric R Funk

Clement Vanden Godbold

Troy W Harris, Iii

Byron Keith Miller

Colin Eric Das

David A Johnson

Jacob C Kallara

Roger K Amundson

Jeffrey David Dawson

Matthew L Spencer

Collne E Das

An electric implement power management system includes an electronic controller that monitors total electric implement load and commands a transmission to reduce the speed of the traction drive wheels below the desired traction drive speed if the total electric implement load reaches a maximum allowable load.

Electric implement power management system

A robotic mower sensor assembly for detecting a boundary wire signal. The sensor assembly includes a plurality of analog inductive sensors with a first inductive sensor oriented along a first axis and a second inductive sensor oriented along a second, different axis. Each inductive sensor is configured to generate a signal indicative of the distance of the robotic mower from the boundary wire. A control unit communicating with the sensor assembly is configured to operate the robotic mower in response to the signals from the sensor assembly which are indicative of the distance of the robotic mower from the boundary wire.

Boundary sensor assembly for a robotic lawn mower, robotic lawn mower and robotic lawn mower system

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

An electric lawn tractor roll away prevention system includes a brushless DC electric motor powering a traction drive wheel on the electric lawn tractor. The motor is connected to phase wires and provides a back EMF voltage on the phase wires if the electric lawn tractor rolls and turns the traction drive wheel without electric power from the motor. A three phase inverter rectifies the back EMF voltage, turns on the traction controller if the rectified voltage reaches a pre-specified threshold, and applies a voltage to the phase wires to reduce the speed of the electric lawn tractor by regenerative braking.

Electric lawn tractor roll away prevention system

A power limiting system for multiple electric motors includes an electrical power generating component, such as an alternator, and a plurality of motor controllers connected to an electrical bus. Each motor controller compares the voltage on the bus to a specified minimum voltage and a specified maximum voltage, and reduces its electric power output if the voltage on the bus is less than the maximum voltage while continuing to operate the electric motors.

Power limiting system for multiple electric motors

Growing community of inventors

Cary, NC, United States of America

Patrick Wilson Cross