Shift range control device

A shift range control device for switching a shift range by controlling driving of a motor in a shift range switching system, in which a play exists between a motor shaft which is a rotation shaft of a motor and an output shaft to which the rotation of the motor is transmitted, the shift range control device comprising:

• a parameter calculation unit for calculating a motor angle, a motor speed and a motor acceleration based on a motor rotation angle signal acquired from a motor rotation angle sensor which detects a rotation position of the motor;
• an idling check unit for checking an end of an idle rotation state, in which the motor rotates within a range of the play, based on the motor speed and the motor acceleration;
• a target setting unit sets a motor angle target value related to drive control on the motor, by using an angle correction value which is a value corresponding to the motor angle at the end of the idle rotation state;
• and
• a drive control unit for controlling the driving of the motor such that the motor angle becomes the motor angle target value.