Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2005-01-25
2005-01-25
Chin, Gary (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C180S443000, C180S446000
Reexamination Certificate
active
06847876
ABSTRACT:
An electric power steering apparatus for detecting the rotational angles of a steering shaft, which connects the steering wheel of a vehicle and the steering mechanism, at different positions in the axial direction of the steering shaft, calculating torque applied to the steering shaft based on the difference between the detected rotational angles, and driving and controlling a steering force assisting motor according to the direction and magnitude of the calculated torque. The angular velocities of the steering shaft at the respective detection positions are calculated based on the rotational angles. Based on the relation between the calculated angular velocities, a judgment is made as to whether the torque was caused by an input from the steering wheel side or an input from the steering mechanism side. Based on the result of the judgment, the motor is driven and controlled.
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Chin Gary
Koyo Seiko Co. Ltd.
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