METHOD AND SYSTEM FOR CONTROLLING 3-DIMENSIONAL VARIABLE GEAR RATIO

摘要

PURPOSE: A system for controlling 3 dimensional variable gear ratio and a method thereof is provided to improve a driving convenience and a driving stability according to a change of a vehicle speed by a car speed and to control a steering turning ratio of the portion on-center/off-center of a rack bar by a steering angle. CONSTITUTION: A system for controlling 3 dimensional variable gear ratio comprises: a steering angle signal processing unit(402) which calculates a steering angle by receiving a steering angle signal from a steering angle sensor; a vehicle speed signal processing unit(404) which calculates a driving speed by receiving a driving speed signal from a driving speed sensor; and a controller(410) which acquires a variable gear ration of a steering angle and a driving speed according to a 3 dimensional variable gear ration map which is drawn by two variables of a steering angle and a driving speed.