Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2006-11-14
2006-11-14
Jeanglaude, Gertrude A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C701S041000, C180S443000, C324S522000
Reexamination Certificate
active
07136733
ABSTRACT:
A method and system for detecting faults in an electric power-assisted steering system includes determining a voltage vector of an electric power-assisted steering motor and measuring a current vector of the motor. Acceptable angular relationships are defined between the voltage vector and the current vector, which are then compared to find a fault if the angle does not meet the acceptable angular relationship. Additionally, motor direction and position can also be used against an angular check of the voltage and/or current vector. Similarly, torque direction can be used. In this way, several different faults can be determined dynamically under transient conditions.
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De Larminat Ronan
Kurnia Alexander
Liu Guang
Repplinger Scott W.
Cunningham Gary J.
Hughes Terri S.
Jeanglaude Gertrude A.
Mancini Brian M.
Motorola Inc.
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