Patent ID: 9421998
Filing Date: 2016-08-23
CPC Classification: B62D,G01R

Claim Text:
1. A method for detecting a motor error of a motor driven power steering (MDPS) comprising a three-phase AC motor, the method comprising: detecting a current at a first one of three-phase AC motor; calculating, by a control unit, a Q-axis command current corresponding to requested torque for steering at least one wheel; computing a phase command current of the first phase of the motor based on the Q-axis command current; comparing the detected current against a first predetermined reference value; comparing the phase command current against a second predetermined reference value; increasing an error count for the first phase of the motor when the detected current is smaller than the first predetermined reference value and the phase command current is greater than the second predetermined reference value; decreasing the error count for the first phase of the motor when the detected current is greater than the first predetermined reference value or when the detected current is smaller than the first predetermined reference value and the phase command current is smaller than the second predetermined reference value; determining that the first phase has a problem when the error count is greater than a third predetermined reference value.