APPARATUS AND METHOD FOR CONTROLLING MOTOR DRIVEN POWER STEERING SYSTEM

Provided are an apparatus and a method for controlling a motor driven power steering system. The apparatus may include an MDPS basic logic unit (300) configured to determine a first auxiliary command current (Iref_a) in a manual driving mode of a vehicle, an autonomous driving steering control unit (700) configured to determine a second auxiliary command current (Iref_B) in an autonomous driving mode, a filter unit (500) configured to filter the column torque (T) so that noise torque is removed, and a control unit (600) configured to control whether to activate the filter unit according to whether a predefined sudden steering condition is satisfied, to judge a driver's steering intervention on the basis of selectively filtered column torque, to determine a final auxiliary command current (Iref_final) by applying a weight (K) to the first and second auxiliary command currents, and to control switching from the autonomous driving mode to the manual driving mode. [0002] (Figure 2)