Motor controller
AssigneeDenso Corporation
InventorSeiji NAKAYAMA
Life of this patent
Estimating the term…
Abstract
A motor controller includes a first forward driver rotating a motor in a forward rotation direction, a torque short determiner determining short of a switch torque, a backward driver driving the motor up to an extreme position in the backward rotation direction in a switch torque short case, and a second forward driver rotating the motor from the extreme position to a target position. When the second forward driver drives the motor, a drive objet is rotated not only by a motor torque but also by a twist backlash torque from a rotation transmission part. Further, after a rotation of the motor in the forward rotation direction, the backward rotation operation of the motor is performed only in the switch torque short case, thereby reducing a shift position switch time in a switch torque sufficient case.
Claims10
A motor controller for controlling a motor that serves as a drive power source of a shift-by-wire system for a rotation drive of a drive object in a shift position switch mechanism of a vehicle, the motor controller comprising:
- a first forward driver rotating the motor in a forward rotation direction that is defined as a direction from a start position to a target position according to a shift position switch instruction, the start position of motor rotation defined as a position of motor rotation at a start time of switching of a shift position;
- a torque short determiner determining whether a switch torque applied to the drive object for switching the shift position is short of required magnitude, based on a current position and a target position of motor rotation, when the motor is under a rotation control to rotate in the forward rotation direction;
- a backward driver rotating the motor up to an extreme in a backward rotation direction that is defined as a direction from the target position to the start position, when the switch torque is determined to be short of required magnitude;
- and
- a second forward driver rotating the motor in the forward rotation direction from the extreme to the target position.
A motor controller for a vehicle, the motor controller comprising:
- a first forward driver rotating a motor in a forward rotation direction that is defined as a direction from a start position to a target position according to a shift position switch instruction, the start position of motor rotation defined as a position of motor rotation at a start time of switching of a shift position;
- a torque short determiner determining whether a switch torque applied to a drive object for switching the shift position is short of required magnitude, based on a current position and a target position of motor rotation, when the motor is under a rotation control to rotate in the forward rotation direction;
- a backward driver rotating the motor up to an extreme in a backward rotation direction that is defined as a direction from the target position to the start position, when the switch torque is determined to be short of required magnitude;
- and
- a second forward driver rotating the motor in the forward rotation direction from the extreme to the target position.
Dependencies are inferred from the claim text.