| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique which can quickly determine the interphase short circuit of a brushless motor and also perform a steering assist control continuously even if the interphase short circuit occurs. <P>SOLUTION: This electric power steering device includes: an interphase short circuit determination part which determines that the short circuit occurs in a control unit 51 when determining that a phase current is brought into an oscillating state in which the state of the overcurrent due to a predetermined short circuit and the state of the overcurrent due to a predetermined regeneration are alternately repeated; and a steering assist control unit which detects a phase in which the interphase short circuit occurs based on the results determined by the interphase short circuit determination part, suppresses the occurrence of overcurrent in a switching element connected to the phase in which the interphase short circuit occurs by restricting the duty of the switching element, and continuously performs the steering assist control. <P>COPYRIGHT: (C)2011,JPO&INPIT |
