| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a current detector for correcting a relative error value of an offset value included in a current detected value of an electric power steering device or the offset value. SOLUTION: At the time that a current of a motor turned on by an ignition key 11 is zero (the initial state), the difference between voltages to be generated on both ends of resistors R1, R2 inserted downstream from two arms of a FET motor driving circuit 30 is detected by operation amplifiers OP1, OP2 and taken as an offset value of the motor current detected value, and the relative error is stored in a memory 49 by a current correcting calculator 48. After a steering device is made into the operating state, the relative error of the offset value of the motor current value stored in the memory 49 is subtracted from the motor current value obtained by sampling for each specified time, and the motor current value (i) is calculated.</p> |
