US 11,738,798 B2
Turning control system
Terutaka Tamaizumi, Okazaki (JP)
Assigned to JTEKT CORPORATION, Osaka (JP)
Filed by JTEKT CORPORATION, Osaka (JP)
Filed on Apr. 23, 2020, as Appl. No. 16/856,607.
Claims priority of application No. 2019-086317 (JP), filed on Apr. 26, 2019.
Prior Publication US 2020/0339188 A1, Oct. 29, 2020
Int. Cl. B62D 5/04 (2006.01); B62D 5/00 (2006.01); B62D 6/02 (2006.01); B62D 15/02 (2006.01)
CPC B62D 5/0463 (2013.01) [B62D 5/006 (2013.01); B62D 5/0484 (2013.01); B62D 6/02 (2013.01); B62D 15/021 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A turning control system that operates a turning actuator having an electric motor incorporated therein and turning a turning wheel, the turning control system comprising a controller configured to perform:
a steering operation amount calculating process of calculating a steering operation amount of the electric motor for turning the turning wheel, the steering operational amount being convertible to a torque required for the electric motor to convert an input steering torque input by a driver to a target steering torque by feedback control;
an angle command value calculating process of calculating, based on the steering operation amount, an angle command value of a convertible angle which is convertible to a turning angle of the turning wheel;
an angle operation amount calculating process of calculating an angle operation amount which is convertible to the torque required for the electric motor for converting the convertible angle to the angle command value by feedback control;
a decrease process of decreasing a magnitude of the angle operation amount calculated in the angle operation amount calculating process when a vehicle speed is equal to or lower than a prescribed speed and a magnitude of the input steering torque is equal to or less than a prescribed value;
a correction process of correcting an input when the decrease process is performed such that a magnitude of the input decreases when the angle command value calculating process calculates the angle command value; and
an operation process of operating a drive circuit of the electric motor to control the torque of the electric motor based on the angle operation amount.