US 11,884,343 B2
Steering feel assisting apparatus of steer-by-wire system
Sang Woo Hwang, Seoul (KR); Young Dae Park, Asan-Si (KR); Byung Rim Lee, Seongnam-Si (KR); Min Jun Kim, Busan (KR); Se Hyun Chang, Suwon-Si (KR); and Hyeon Seok Cho, Pyeongtaek-Si (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed on Sep. 22, 2020, as Appl. No. 17/028,529.
Claims priority of application No. 10-2020-0063214 (KR), filed on May 26, 2020.
Prior Publication US 2021/0371008 A1, Dec. 2, 2021
Int. Cl. B62D 5/00 (2006.01); B62D 5/04 (2006.01); F16D 65/09 (2006.01); F16D 65/22 (2006.01); F16D 65/16 (2006.01); B62D 6/00 (2006.01); B62D 15/02 (2006.01)
CPC B62D 6/008 (2013.01) [B62D 5/006 (2013.01); B62D 5/0421 (2013.01); B62D 15/0215 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A steering feel assisting apparatus of a steer-by-wire (SBW) system, the steering feel assisting apparatus comprising:
a disk connected to a steering shaft and configured to rotate with the steering shaft;
a cam engaged to an actuator and configured to receive a rotational force of the actuator to be eccentrically rotated;
a brake arm including a first end portion and a second end portion and configured to selectively friction-contact with an external peripheral surface of the disk to provide a predetermined frictional force in a forward rotation direction of the disk as the brake arm rotates in conjunction with a rotation of the cam;
a steering feel motor configured to provide a steering feel to the steering shaft;
a steering motor coupled to a rack bar and configured to provide a steering force to the rack bar; and
a controller electrically connected to a steering angle sensor, the steering feel motor, the steering motor and the actuator and configured to selectively provide the steering feel in a forward rotation direction of the steering shaft by controlling an operation of the steering feel motor or the actuator according to a steering angle and a torque value of the steering motor,
wherein the brake arm includes a first brake arm and a second brake arm provided on a first side and a second side of the cam, respectively,
wherein one or both of the second end portions of the first and second brake arms friction-contacts with a point of a rotation radius of the cam, which contacts with the external peripheral surface of the disk while drawing a tangential line, and
wherein the controller is configured to restrict a rotation of the steering shaft by generating a maximum repulsive force in the steering feel motor when an absolute value of a target torque of the steering motor is equal to or greater than an absolute value of a threshold torque and a differential value of the absolute value of the target torque is more than 0.