Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-03-08
2005-03-08
Martin, David (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S799000, C318S432000, C318S434000, C180S443000, C180S446000, C701S041000, C701S042000
Reexamination Certificate
active
06864662
ABSTRACT:
An electric power steering assist system for an automotive vehicle comprises a brushless electric motor and a control module for regulating the motor based upon space vector modulation. In response to a steering command, the control module determines a desired quadrature axis current component to provide torque assist in turning the wheels. Also, the control module determines a desired direct axis current component based upon the motor speed such that the desired direct axis current component is zero when the motor speed is less than or equal to the maximum design motor speed, and is negative when the motor speed exceeds the maximum design motor speed. By utilizing a negative direct axis current component, the control module implements a field weakening effect within the motor that allows the motor speed to be temporarily increased greater than the maximum design motor speed to react to rapid steer commands by the operator, such as encountered in evasive maneuvers and the like.
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Brinks Hofer Gilson & Lione
Martin David
Miller Patrick
Visteon Global Technologies Inc.
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