An active human-machine interface system is implemented without a force
sensor. The system includes a user interface that is configured to
receive user input and, upon receipt thereof, to move to a position. A
position sensor is coupled to the user interface and is operable to sense
user interface position and supply a position signal representative
thereof. A motor is coupled to the user interface and to receive motor
current. In response to the motor current the motor supplies a feedback
force to the user interface at a magnitude proportional to the motor
current. A control circuit is coupled to receive at least the position
signal and a signal representative of the motor current and controls the
motor current supplied to the motor.