haptic interface taking into account the user's action plan

haptic interface comprising: - a knob (1) rotatably movable by a user, - an element of interaction (12) with a magneto-rheological fluid, secured to the knob (1), - means for measuring a current position (14) of button (1) - a brake having a magneto-rheological fluid and a system for generating (6) a magnetic field in said fluid, - a control unit adapted to generate commands to said field generating system magnetic change the value of the magnetic field, and - means for detecting the torque exerted by a user on the button (1) in order to know the direction of the torque, and if the torque is greater than a given value for a given sense, the control unit controlling the generation (6) of a magnetic field on the basis of information obtained from the torque at least when a zero or low speed button (1).