US 12,330,719 B2
Steering system
Yusuke Kakimoto, Okazaki (JP); Takashi Kodera, 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. 17/347,258.
Claims priority of application No. 2020-105198 (JP), filed on Jun. 18, 2020.
Prior Publication US 2021/0394821 A1, Dec. 23, 2021
Int. Cl. B62D 5/04 (2006.01); B62D 5/00 (2006.01); B62D 6/00 (2006.01); B62D 15/02 (2006.01)
CPC B62D 5/0481 (2013.01) [B62D 5/006 (2013.01); B62D 5/046 (2013.01); B62D 6/002 (2013.01); B62D 6/008 (2013.01); B62D 15/02 (2013.01); B62D 15/021 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A steering system comprising:
a steering operation shaft in which power transmission to and from a steering wheel is disabled and that steers a steered wheel of a vehicle;
a steering operation motor that generates a steering operation force that is a torque applied to the steering operation shaft so as to steer the steered wheel;
a control device includes an electronic controller configured to control the steering operation motor;
a steering shaft that rotates in conjunction with operation of the steering wheel; and
a reaction motor that generates a steering reaction force that is a torque applied to the steering shaft and acting in a direction opposite to a steering direction, wherein:
the control device determines a rotation position of the steering wheel and a steered position of the steered wheel as an initial operation in response to an ignition power supply being turned on;
the control device determines a deviation amount of the rotation position of the steering wheel with regards to the rotation position corresponding to the steered position of the steered wheel;
in a case where at least one of starting of the vehicle and steering of the steering wheel is performed a first time after the ignition power supply being turned on, when the rotation position of the steering wheel is different from the rotation position corresponding to the steered position of the steered wheel, the control device executes a process for correcting the steered position of the steered wheel to a position corresponding to the rotation position of the steering wheel through the steering operation motor;
during the process for correcting the steered position of the steered wheel to the position corresponding to the rotation position of the steering wheel, the control device controls the steering operation motor such that the steered position of the steered wheel incrementally changes toward the position corresponding to the rotation position of the steering wheel based on a vehicle speed or a steering angular velocity; and
the control device has a function of executing, when the ignition power supply is turned on and the rotation position of the steering wheel is different from a correct rotation position corresponding to the steered position of the steered wheel, a correction process of causing the steering wheel to rotate through the reaction motor so as to reduce the deviation amount of the rotation position of the steering wheel with respect to the correct rotation position;
in a case where the ignition power supply is turned on:
the control device determines whether the deviation amount is equal to or more than a predetermined allowable amount,
when the deviation amount is equal to or more than the predetermined allowable amount, the control device executes the correction process prior to the starting of the vehicle, and
when the deviation amount is less than the predetermined allowable amount, the control device executes the process for correcting the steered position of the steered wheel to the position corresponding to the rotation position of the steering wheel without executing the correction process.