Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Reexamination Certificate
2006-01-10
2006-01-10
Duda, Rina (Department: 2837)
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
C318S603000, C318S652000, C318S653000, C318S432000, C324S207110, C324S207140
Reexamination Certificate
active
06984954
ABSTRACT:
A strategy to control and diagnose the operation of an electric motor using a sensorless control system augmented by feedback from a position and speed sensor is disclosed. The strategy can improve the robustness of operation and diagnose potential faults in electric motors. The present invention includes a method for diagnosing operation of an electric motor and a method and system for controlling an electric motor. In the diagnostic method, a sensorless system and a sensor based system are checked against each other to determine if either of the systems is faulted. In the control method, the sensor based control system is used when the motor speed is below a predetermined threshold and the sensorless system is used when the motor speed is above the predetermined threshold. The position sensor can be a low resolution position sensor, an engine crankshaft sensor, an engine camshaft sensor, or a transmission sensor.
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Degner Michael W.
Huang Henry Heping
Leonardi Franco
Miller John Michael
Brooks & Kushman P.C.
Duda Rina
Ford Global Technologies LLC
Hanze Carlos
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