| 摘要 |
PURPOSE: To provide a control device for a motor driven power steering device, which can detect the failure of a motor current detection circuit. CONSTITUTION: A motor current command value I is applied to a feedback control circuit for the specified period of time T with an ignition key turned op, and current thereby flows to a motor. A motor current value (i) detected by a motor current detector 42 at a time when the specified period of time T0 (T0<T) has elapsed, is inputted into the comparator 23 of the feedback control circuit. A failure detector 32 compares the estimated value Ds of a duty ratio for a PWM signal estimated based on the motor current command value I with the actually measured value of a duty ratio for a PWM signal outputted from the adder 27 of the feedback control circuit to which the motor current detected value (i) has been feedback. As the result of comparison, when an absolute value of its difference is larger than a specified allowable value ΔD, it is thereby judged that the motor current detector 42 has failed. |
