US 11,807,313 B2
Vehicle steering device
Maxime Moreillon, Nara (JP); Tsutomu Tamura, Nara (JP); Robert Fuchs, Nara (JP); and Tomohiro Nakade, Sakurai (JP)
Assigned to JTEKT CORPORATION, Osaka (JP)
Appl. No. 16/767,852
Filed by JTEKT CORPORATION, Osaka (JP)
PCT Filed Nov. 28, 2018, PCT No. PCT/JP2018/043841
§ 371(c)(1), (2) Date May 28, 2020,
PCT Pub. No. WO2019/107437, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-230561 (JP), filed on Nov. 30, 2017.
Prior Publication US 2020/0290668 A1, Sep. 17, 2020
Int. Cl. B62D 5/04 (2006.01); B62D 6/00 (2006.01); B62D 3/12 (2006.01)
CPC B62D 5/0463 (2013.01) [B62D 5/0421 (2013.01); B62D 6/002 (2013.01); B62D 6/005 (2013.01); B62D 3/12 (2013.01); B62D 5/0454 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A vehicle steering device comprising:
an electric motor that applies a steering force to a turning mechanism of a vehicle;
a microcomputer configured to:
set a target assist torque in accordance with a steering torque;
set an angle controlling target torque for reducing an angular deviation between a target steering angle and an actual steering angle;
estimate a compensation object load with respect to the angle controlling target torque;
calculate a target automatic steering torque based on the angle controlling target torque set by the microcomputer and the compensation object load estimated by the microcomputer; and
perform weighted addition of the target automatic steering torque and the target assist torque in accordance with a value that changes in accordance with a driver input to calculate a target motor torque that is a target value of a motor torque of the electric motor; and
a drive circuit configured to control the electric motor based on the target motor torque that is calculated by the microcomputer.