| 摘要 |
PURPOSE: A control method of a motor driven power steering apparatus is provided to prevent an accident caused by a self steer by changing a system into a safety mode when a control direction of inputted steering torque generates an error in order to generate assist force in the motor driven power steering apparatus. CONSTITUTION: A control method of a motor driven power steering apparatus comprises steps(S10,S12,S14) of inputting steering state into a steering control unit; a step(S16) of calculating torque difference from set time according to steering state; a step of changing a system into a safety mode when the torque difference is over a pretended value; a step(S20) of calculating holding force when the torque difference is below the pretended value; and a step(S22) of driving the motor of deceleration apparatus with the holding force. [Reference numerals] (AA) Start; (BB) End; (S10) Inputting a steering angle; (S12) Inputting column torque; (S14) Inputting driving speed; (S16) Calculating a torque difference to a set time; (S18) Torque difference≥18Nm ?; (S20) Calculating a holding force; (S22) Driving a motor; (S24) Torque difference sequentially changes?; (S26) Converting into a safety mode
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