Motor control device
AssigneeDenso Corporation
InventorsEiji ISOBE, Shigeru Kamio
Life of this patent
Estimating the term…
Abstract
A control unit learns at least one limit position in a movable range of an object to be controlled which is driven by a motor, and reduces learning time of a limit position. The control unit rotates the motor until the motor strikes the object against at least one limit position in a movable range of the object to learn the limit position. In the strike control, the control unit drives the motor first by a first duty ratio to increase the rotation of the motor toward the limit position quickly, and then by a second duty ratio lower than the first duty ratio to thereby reduce the impact load generated at the time of collision. In place of the duty ratio, a phase advance amount may be changed to reduce the impact load.
Claims4
A motor control device comprising:
- rotational position detecting means for detecting a rotational position of a motor that rotationally drives an object to be controlled;
- control means for sequentially changing over an energizing phase of the motor according to the rotational position of the motor to rotationally drive the motor to a target position;
- and
- learning means for executing strike control that rotates the motor until the motor strikes the object against at least one limit position in a variable shift range of the object to learn the limit position,
- wherein the learning means lowers a torque of the motor in a course of execution of the strike control.
A motor control device comprising:
- rotational position detecting means for detecting a rotational position of a motor that rotationally drives an object to be controlled;
- control means for sequentially changing over an energizing phase of the motor according to the rotational position of the motor to rotationally drive the motor to a target position;
- and
- learning means for executing strike control that rotates the motor until the motor strikes the object against at least one limit position in a variable shift range of the object to learn the limit position,
- the learning means reduces a phase advance amount of the energizing phase in a course of execution of the strike control to suppress a driving speed of the motor.
Dependencies are inferred from the claim text.