Patent ID: 8058834
Filing Date: 2011-11-15
Classification: F16D,H02P

Abstract:
1. A control device for controlling an automatic transmission in which driving power of an engine is transmitted to a gear shift mechanism through a clutch, engaging force of the clutch being adjusted by a motor, the control device comprising: a motor control unit for controlling the rotation of the motor, wherein the motor control unit has a motor target current calculating unit for calculating target current in the motor, a current detecting resistor for detecting motor current flowing when the motor rotates, and a current detecting unit for sampling a voltage occurring in the current detecting resistor to detect the motor current, and the current detecting unit has a counter for counting a variation number of a rotational position signal output from a rotational position detecting unit for detecting the rotational position of the motor, and an electrical angle 180° judging unit for judging on the basis of the count value of the counter that the motor rotates at 180° in electrical angle, and wherein the voltage occurring in the current detecting unit is sampled at each timing corresponding to an integral multiple of 180° in electrical angle that is detected by the electrical angle 180° judging unit, and rotation of the motor is controlled in accordance with the difference between the motor target current calculated by the motor target current calculating unit and the motor current.