Patent ID: 9085318
Filing Date: 2015-07-21
Classification: B62D,G01L

Abstract:
1. An electric power steering apparatus comprising: a torque sensor configured to detect a torque applied to a steering wheel; a current detector configured to measure a current flowing through a driving motor; and an electronic control unit configured to estimate a current flowing through the driving motor based on the detected torque and compare the estimated current with the measured current to determined a malfunction of the torque sensor or the current detector, wherein the electronic control unit calculates the current flowing through the driving motor by receiving a detected torque value from the torque sensor, by determining an angular speed of the steering wheel based on the detected torque value, by calculating an angular speed of the driving motor based on the angular speed of the steering wheel and a gear ratio of a reducer, and by estimating the current flowing through the driving motor based on a voltage across the driving motor, a back EMF constant of the driving motor, a resistance of the driving motor, and an angular speed of the driving motor.