Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2006-06-20
2006-06-20
Nguyen, Thu V. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
Reexamination Certificate
active
07065436
ABSTRACT:
In a variable ratio steering system of a vehicle with a variable steering ratio mechanism varying a steering ratio R of steering wheel angle θSto road wheel steer angle θWat steered road wheels, a vehicle speed sensor, and a steering angle sensor, a steering ratio control unit controls the steering ratio according to a fixed steering ratio characteristic when the steering wheel angle θSis less than or equal to a predetermined angle θ1substantially corresponding to a neutral position of a steering wheel. Conversely when the steering wheel angle θSis greater than the predetermined angle θ1substantially corresponding to the neutral position of the steering wheel, the steering ratio control unit controls the steering ratio according to a vehicle-speed dependent steering ratio characteristic that a steering angle versus road wheel steer angle characteristic varies depending on a vehicle speed value.
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Foley & Lardner LLP
Nguyen Thu V.
Nissan Motor Co,. Ltd.
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