公开(公告)号：US20190023318A1

公开(公告)日：2019-01-24

申请号：US16072272

申请日：2017-02-09

Applicant: NSK LTD.

Inventor： Nobuhiro MITSUISHI ,  Sakae NEJO ,  Sumio SUGITA ,  Tomonori SATO

IPC: B62D6/00 ,  B62D5/00 ,  B62D5/04

Abstract: To provide a vehicle steering control device capable of alleviating discomfort caused by mismatch between a steering angle of a steering wheel and a steered angle of a drive wheel generated by automatic steering using an EPS device. The vehicle steering control device has a first steering assist mode of assisting driver's steering and a second steering assist mode of performing steering independently from the driver's steering. A second controller, performs phase shift suppression control to suppress a relative shift of a phase of a differential mechanism on a steering wheel side with respect to a reference phase on the steering wheel side of the differential mechanism corresponding to a phase on a rack-and-pinion side of the differential mechanism in the first steering assist mode.

公开(公告)号：US20190039650A1

公开(公告)日：2019-02-07

申请号：US16072073

申请日：2017-02-09

Applicant: NSK Ltd.

Inventor： Tomonori SATO ,  Sakae NEJO ,  Nobuhiro MITSUISHI ,  Sumio SUGITA

IPC: B62D15/02 ,  B62D5/00 ,  B62D6/00 ,  B62D5/04

CPC classification number: B62D15/0265 ,  B62D5/008 ,  B62D5/0463 ,  B62D5/0472 ,  B62D6/002 ,  B62D6/003 ,  B62D6/008 ,  B62D15/025

Abstract: To provide a vehicle steering control device capable of suppressing influence of a torque generated during driving support by an EPS device on steering of a steering wheel performed by a driver. The vehicle steering control device includes an EPS controller (first controller) that controls a speed reduction mechanism and a differential mechanism controller (second controller) that controls a differential mechanism. In addition, the vehicle steering control device has a first steering assist mode of assisting driver's steering and a second steering assist mode of performing steering independently from the driver's steering. In the second steering assist mode, the second controller controls the differential mechanism so as to cancel a torque applied to a rack-and-pinion side of the differential mechanism from the speed reduction mechanism controlled by the first controller.

公开(公告)号：US20180072343A1

公开(公告)日：2018-03-15

申请号：US15561664

申请日：2016-04-12

Applicant: NSK Ltd.

Inventor： Sumio SUGITA ,  Atsushi MAEDA ,  Nobuhiro MITSUISHI

IPC: B62D5/04 ,  B62D6/08 ,  B62D6/00 ,  B62D5/00

CPC classification number: B62D5/0463 ,  B62D5/008 ,  B62D5/0472 ,  B62D6/008 ,  B62D6/08 ,  B62D15/0265

Abstract: A steering device includes: a variable actuator capable of changing an angle ratio between a steering angle of a steering wheel and a turning angle of a turning wheel; a steering auxiliary mechanism arranged between the variable actuator and the turning wheel to apply steering auxiliary force to a steering mechanism; a torque angle sensor to detect steering torque to be inputted into the steering mechanism. The steering auxiliary mechanism is driven such that the steering auxiliary force in accordance with the steering torque is generated, and, when an avoidance instruction is inputted, an automatic steering control is performed to drive-control the steering auxiliary mechanism so as to run at the turning angle specified by steering position instruction to be inputted. The angle ratio of the variable actuator is adjusted so as to suppress reaction force to be transmitted to the steering wheel by performing the automatic steering control.