Motor position learning apparatus and method for electric shift-by-wire system
AssigneeHyundai Kefico Corporation
InventorMin Ju Kim
Life of this patent
Estimating the term…
Abstract
Motor position learning method and apparatus for an electric shift-by-wire system are proposed. The method includes setting, as a first reference position, a motor position at a time point when shift is completed; driving the motor in opposite directions on the basis of the first reference position; measuring a rotation amount of the motor and a driving current flowing through the motor while the motor is driven in opposite directions; and calculating a rotation amount of the motor at a point where the driving current of the motor becomes minimum, and setting, as a second reference position, a position resulting after the motor rotates further by the calculated rotation amount from the first reference position.
Claims8
A motor position learning method for an electric shift-by-wire system that rotates a motor to change a shift stage, the method comprising:
- setting, as a first reference position, a motor position at a time point when shift is completed;
- driving the motor in opposite directions on the basis of the first reference position;
- measuring a rotation amount of the motor and a driving current flowing through the motor while the motor is driven in the opposite directions;
- and
- calculating a rotation amount of the motor at a point where the driving current of the motor becomes minimum, and setting, as a second reference position, a position resulting after the motor rotates further by the calculated rotation amount from the first reference position.
A motor position learning method for an electric shift-by-wire system that rotates a motor to change a shift stage, the method comprising:
- determining whether a shift stage change is completed;
- rotating the motor in opposite directions on the basis of a motor position at a time point when the shift stage change is completed;
- measuring a rotation amount of the motor and a driving current flowing through the motor;
- and
- calculating the rotation amount of the motor at a point where the measured driving current of the motor becomes minimum, and setting a reference position of the motor by correcting, by the calculated rotation amount, the motor position at the time point when the shift stage change is completed.
A motor position learning apparatus for an electric shift-by-wire system that rotates a motor to change a shift stage, the apparatus comprising:
- a driving unit configured to rotate the motor in opposite directions by outputting a driving signal to the motor after shift is completed to a target shift stage;
- a measurement unit configured to measure a rotation amount of the motor and a driving current flowing through the motor;
- and
- a learning unit configured to calculate the rotation amount of the motor at a point where the driving current of the motor becomes minimum, and correct a predetermined reference position of the motor by the calculated rotation amount to reset the reference position of the motor.
Dependencies are inferred from the claim text.