US 12,030,559 B2
Steering system
Yusuke Kakimoto, Okazaki (JP); Yoshiyuki Uchino, Okazaki (JP); Kenji Shibata, Nagoya (JP); and Takafumi Sato, Kariya (JP)
Assigned to JTEKT CORPORATION, Kariya (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by JTEKT CORPORATION, Osaka (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jun. 14, 2021, as Appl. No. 17/346,796.
Claims priority of application No. 2020-105195 (JP), filed on Jun. 18, 2020.
Prior Publication US 2021/0394820 A1, Dec. 23, 2021
Int. Cl. B62D 5/04 (2006.01); B62D 15/02 (2006.01)
CPC B62D 5/0463 (2013.01) [B62D 15/021 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A steering system comprising:
a steering shaft that rotates along with an operation of a steering wheel;
a motor configured to generate a torque that is applied to the steering shaft; and
a control unit configured to control the motor, wherein the control unit is configured to
control the motor such that a rotation speed of the steering wheel decreases gradually to zero when automatic rotation of the steering wheel is stopped, in a case where the steering wheel is automatically rotated as an adjustment process of adjusting a rotational position of the steering wheel,
control the motor such that the rotation speed of the steering wheel increases gradually when the automatic rotation of the steering wheel is started, in the case where the steering wheel is automatically rotated as the adjustment process,
perform steering angle feedback control for causing a steering angle that is a rotation angle of the steering wheel to reach a target steering angle that is set based on a point of view of adjustment of the rotational position of the steering wheel, and
gradually change the rotation speed of the steering wheel by gradually changing a value of the target steering angle to a final target steering angle that is set based on the point of view of the adjustment while limiting the value of the target steering angle, when the automatic rotation of the steering wheel is started and when the automatic rotation of the steering wheel is stopped.