Abstract: Provided are an electric power steering system and a method for checking an initial driving thereof, in which no additional redischarging and charging time is required by simultaneously determining a freezing of a safety switch and/or a safety switch off of a sub MCU, which monitors a state of a main MCU, thereby shortening initial driving time of the electric power steering system. The electric power steering system includes: a power supply; a motor configured to generate steering auxiliary power; a safety switch provided between the power supply and the motor and configured to control supply of power; a main MCU configured to control an operation of the safety switch; and a sub MCU configured to monitor a state of the main MCU.

Abstract: Exemplary embodiments of the present invention relate to a method for controlling stop modes of a motor-driven power steering capable of suppressing discharging of a battery While enhancing driver's convenience and safety by combining and determining various states of a vehicle. In accordance with an embodiment of the present invention, a method for controlling stop modes of a motor-driven power steering includes: a first step of confirming Whether a vehicle speed of a vehicle is present; a second step of confirming whether an engine of the vehicle is operated; a third step of confirming whether an alternator is driven or an ignition switch is turned on or off; and a fourth step of delaying the stop of the motor-driven power steering for a predetermined different time depending on a confirmation result in the first, second, and third steps.

Abstract: Disclosed is a method and a system for detecting a reducer fault, which extracts an angle of a steering angle sensor and an angle of a motor position sensor after the initialization of the steering angle sensor and the motor position sensor, and when a difference value between two extracted angles is equal to or larger than a predetermined angle, detects a fault of a reducer for rotation connection between a steering wheel and a motor. The method and the system can accurately detect the fault of the reducer for rotation connection between the steering wheel and the motor included in the motor driven power steering system, thereby effectively preventing occurrence of an accident due to the fault of the reducer.

Abstract: Provided are an electric power steering system and a method for checking an initial driving thereof, in which no additional redischarging and charging time is required by simultaneously determining a freezing of a safety switch and/or a safety switch off of a sub MCU, which monitors a state of a main MCU, thereby shortening initial driving time of the electric power steering system. The electric power steering system includes: a power supply; a motor configured to generate steering auxiliary power; a safety switch provided between the power supply and the motor and configured to control supply of power; a main MCU configured to control an operation of the safety switch; and a sub MCU configured to monitor a state of the main MCU.

Abstract: Disclosed is a method and a system for detecting a reducer fault, which extracts an angle of a steering angle sensor and an angle of a motor position sensor after the initialization of the steering angle sensor and the motor position sensor, and when a difference value between two extracted angles is equal to or larger than a predetermined angle, detects a fault of a reducer for rotation connection between a steering wheel and a motor. The method and the system can accurately detect the fault of the reducer for rotation connection between the steering wheel and the motor included in the motor driven power steering system, thereby effectively preventing occurrence of an accident due to the fault of the reducer.

Abstract: Disclosed is a method and an apparatus for detecting a steering angle sensor initialization fault, which includes a steering angle sensor initialization detector for detecting a performance of initialization of a steering angle sensor of a vehicle, a straight drive determination unit for determining a straight drive state of the vehicle based on at least one of a steering angle speed, a torque, and a vehicle speed when the performance of the initialization has been detected, and a fault detector for detecting an offset angle of the steering angle sensor, determining if the offset angle is equal to or larger than a predetermined angle, and detecting a fault in the initialization of the steering angle sensor when the vehicle has been determined to be in the straight drive state.