A steer-by-wire system for an automotive vehicle comprises a driver interface
system
that includes a steering wheel mounted on a steering column. A reaction torque
generator is coupled to the steering column for applying a resistive torque in
response to a steering command to create a steering feel. An electromechanical
brake, such as a magnetorehological brake, is also coupled to the steering column.
During operation, a controller receives an input signal indicative of road wheel
response to a steering command and determines when the road wheels have reached
a limit, such as by engaging mechanical stops mounted on the vehicle or prevented
from movement by curb or other external obstacle. In response, the controller actuates
the electromechanical device to prevent rotation of the steering wheel and thereby
alert the driver that the road wheels have reached a limit.
