Motor overspeed detection
AssigneeCNH America LLC
InventorsJohn G. Brome, Yun-Ren Ho
Life of this patent
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Abstract
A motor control system of a combine having a rotor that is simultaneously driven by an engine and a hydraulic motor is configured to determine at overspeed condition of the motor and to disengage the motor from the engine when the overspeed condition exists.
Claims11
A motor control system for a combine having a hydraulic motor and an internal combustion engine that are configured to be simultaneously coupled to and simultaneously drive a combine rotor, the system comprising:
- at least one electronic controller configured to calculate at least two alternative first and second motor speed values, include a first threshold motor speed and a second wherein the first motor speed value is obtained from a motor speed sensor and wherein the second motor speed value is obtained from both an engine speed sensor and a rotor speed sensor and further wherein the electronic controller is configured to compare the first and second motor speed values with at least one threshold motor speed value and to disengage the motor from the engine when both alternative first and second motor speed values exceed the threshold motor speed value for a predetermined interval.
A method for controlling motor overspeed in a combine having a hydraulic motor and an internal combustion engine that are configured to be simultaneously coupled to and simultaneously drive a combine rotor, the method comprising the steps of:
- electronically calculating at least two alternative first and second motor speed values, wherein the first motor speed value is obtained from a motor speed sensor and wherein the second motor speed value is obtained from both an engine speed sensor and a rotor speed sensor;
- electronically comparing the first and second motor speed values with at least one threshold motor speed value, and
- disengaging the motor from the engine when both first and second motor speed values exceed the threshold motor speed value for a predetermined interval.
A motor control system for a combine having a hydraulic motor and an internal combustion engine that are configured to be simultaneously coupled to and simultaneously drive a combine rotor, the system comprising:
- means for calculating at least two alternative first and second motor speed values, wherein the first motor speed value is obtained from a motor speed sensor and wherein the second motor speed value is obtained from both an engine speed sensor and a rotor speed sensor,
- means for comparing the first and second motor speed values with at least one threshold motor speed value, and
- means for disengaging the motor from the engine when both the first and second motor speed values exceed the threshold motor speed value for a predetermined interval.
Dependencies are inferred from the claim text.