公开(公告)号：US10946894B2

公开(公告)日：2021-03-16

申请号：US16017155

申请日：2018-06-25

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Tejas M. Varunjikar ,  Dennis B. Skellenger ,  Nicholas M. Trewhella ,  Jeffrey A. Zuraski ,  Jeffrey T. Klass ,  Michael K. Hales

IPC: B62D6/00 ,  B62D5/04 ,  B62D5/00

Abstract: Technical solutions are described for providing driver warning using steering systems. An example steering system includes a motor control system that sends a command to a motor. The steering system further includes a fault monitoring system that sets a fault indication flag by monitoring one or more components of the steering system. The steering system further includes a driver warning feedback system that generates a warning injection signal based on and in response to the fault indication flag being set. Further, the motor control system generates a driver feedback by modifying the command to the motor using the warning injection signal, and sending the modified command to the motor.

公开(公告)号：US10913495B2

公开(公告)日：2021-02-09

申请号：US16003662

申请日：2018-06-08

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Jian Sheng ,  Tejas M. Varunjikar ,  Farhad Bolourchi

IPC: B62D15/02 ,  B62D5/04

Abstract: Technical solutions described herein include a steering system that includes a motor that generates assist torque, and a controller that generates a motor torque command for controlling an amount of the assist torque generated by the motor. The steering system further includes a remote object assist module that computes a steering intervention based on a proximity of a vehicle from a detected object. The controller changes the motor torque command using the steering intervention.

公开(公告)号：US20210031827A1

公开(公告)日：2021-02-04

申请号：US16527774

申请日：2019-07-31

Applicant: Steering Solutions IP Holding Corporation

Inventor： Harshwardhan D. Karve ,  Tejas M. Varunjikar

IPC: B62D5/00 ,  B62D5/04

Abstract: A steer-by-wire system includes a transmission torque sensor, a handwheel position sensor, and a controller. The transmission torque sensor is configured to measure and output a transmission torque signal. The handwheel position sensor is configured to measure and output a handwheel position signal. The controller includes an angle-based load calculation submodule, a torque steer ratio calculation submodule, and a torque control module. The angle-based load calculation submodule is configured to transform the transmission torque signal and the handwheel position signal into an estimated second load value. The torque steer ratio calculation submodule is configured to transform the estimated second load value, a first load value indicative of roadwheel load including torque steer influence, and the transmission torque signal into a torque steer ratio. The torque control module is configured to transform the first load value, the handwheel position signal, and the torque steer ratio into a handwheel torque command signal.

公开(公告)号：US20200262474A1

公开(公告)日：2020-08-20

申请号：US16276332

申请日：2019-02-14

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Tejas M. Varunjikar ,  Mariam S. George

IPC: B62D5/04

Abstract: According to one or more embodiments, a method includes computing, by a steering system, a model rack force value based on a vehicle speed, steering angle, and a road-friction coefficient value. The method further includes determining, by the steering system, a difference between the model rack force value and a load rack force value. The method further includes updating, by the steering system, the road-friction coefficient value using the difference that is determined.

公开(公告)号：US10676129B2

公开(公告)日：2020-06-09

申请号：US16017162

申请日：2018-06-25

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Tejas M. Varunjikar ,  Prerit Pramod ,  Julie A. Kleinau ,  Michael Eickholt ,  Rangarajan Ramanujam ,  Dennis B. Skellenger ,  Steven D. Klein

IPC: B62D5/04 ,  B62D6/10 ,  B62D6/04

Abstract: According to one or more embodiments of the present invention a steer by wire steering system includes a deviation detection unit configured to determine a deviation signal that is indicative of a disturbance in one or more components coupled to a rack. The steer by wire steering system further includes a handwheel notification module configured to generate a modification signal based on the deviation signal, in response to the deviation signal being detected for at least a predetermined duration. The steer by wire steering system further includes a handwheel control module that generates an input command corresponding to a reference torque generated by a road wheel actuator, a feedback torque for a driver is generated based on the input command. The handwheel control module further modifies the input command using the modification signal, the modification providing a notification corresponding to the disturbance to the driver.

公开(公告)号：US20200017139A1

公开(公告)日：2020-01-16

申请号：US16033579

申请日：2018-07-12

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Rangarajan Ramanujam ,  Bhuvanesh Sainath ,  Tejas M. Varunjikar ,  Prerit Pramod

IPC: B62D5/04

Abstract: According to one or more embodiments of the technical solutions described herein, a method for generating torque in a steering system includes computing, by a controller, a lateral velocity of a vehicle using a vehicle model that uses a vehicle velocity, a surface friction estimate, a tire-angle, and at least one of a measured yaw rate from a yaw rate sensor and a lateral acceleration. The method further includes generating, by the controller, a torque command for providing assist torque to a driver, the torque command is based on the lateral velocity that is computed. The method further includes providing, by a motor, the assist torque, which is an amount of torque corresponding to the torque command.

公开(公告)号：US20190389508A1

公开(公告)日：2019-12-26

申请号：US16017162

申请日：2018-06-25

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Tejas M. Varunjikar ,  Prerit Pramod ,  Julie A. Kleinau ,  Michael Eickholt ,  Rangarajan Ramanujam ,  Dennis B. Skellenger ,  Steven D. Klein

IPC: B62D5/04 ,  B62D6/10

Abstract: According to one or more embodiments of the present invention a steer by wire steering system includes a deviation detection unit configured to determine a deviation signal that is indicative of a disturbance in one or more components coupled to a rack. The steer by wire steering system further includes a handwheel notification module configured to generate a modification signal based on the deviation signal, in response to the deviation signal being detected for at least a predetermined duration. The steer by wire steering system further includes a handwheel control module that generates an input command corresponding to a reference torque generated by a road wheel actuator, a feedback torque for a driver is generated based on the input command. The handwheel control module further modifies the input command using the modification signal, the modification providing a notification corresponding to the disturbance to the driver.

公开(公告)号：US10173724B2

公开(公告)日：2019-01-08

申请号：US14933461

申请日：2015-11-05

Applicant: Steering Solutions IP Holding Corporation

Inventor： Bo Yu ,  Anthony J. Champagne ,  Tejas M. Varunjikar ,  Timothy W. Kaufmann

IPC: B62D15/02 ,  B62D5/04 ,  B62D6/10

Abstract: A control system for a power steering system includes an error module that generates an error signal based on a difference of an estimated output vector and an output vector, a scaling module that calculates a feedback correction signal based on the error signal and an observer gain value, an extended state vector estimation module that determines an extended state vector estimate based on the feedback correction signal and a motor torque command, and a gain module that applies a gain to the extended state vector estimate to generate an estimated driver torque signal, the estimated driver torque signal is applied in control of the power steering system.

公开(公告)号：US20180086368A1

公开(公告)日：2018-03-29

申请号：US15717204

申请日：2017-09-27

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Keyur R. Patel ,  Anthony J. Champagne ,  Tejas M. Varunjikar

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

CPC classification number: B62D5/0484 ,  B62D5/0463 ,  B62D5/049 ,  B62D6/00 ,  B62D6/10 ,  B62D15/025

Abstract: Technical solutions are described for providing failsafe assist torque in steering systems. An example method includes determining, by a first controller, a first assist torque signal using a first set of torque sensor signals from a first sensor and a second set of torque sensor signals from a second sensor, the first sensor corresponding to the first controller, and the second sensor corresponding to a second controller. The method further includes determining, by the second controller, a second assist torque signal using the first and second sets of torque sensor signals. Further the method includes generating, by a motor, an assist torque using the first and second assist torque signals, and in response to the first controller receiving a diagnostic signal indicating a failure of the first torque sensor, determining by the first controller, the first assist torque signal using only the second set of torque sensor signals.

公开(公告)号：US20170232998A1

公开(公告)日：2017-08-17

申请号：US15434482

申请日：2017-02-16

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Rangarajan Ramanujam ,  Scott T. Sanford ,  Tejas M. Varunjikar ,  Tao Yang

IPC: B62D5/04 ,  B62D6/10 ,  B62D6/02

CPC classification number: B62D5/0463 ,  B60Y2300/0223 ,  B60Y2300/0227 ,  B62D6/003 ,  B62D6/008 ,  B62D6/02 ,  B62D6/10 ,  B62D15/025

Abstract: Technical features are described for a steering system to compute a state flag value that is indicative of a vehicle motion state, such as an understeer or an oversteer condition. The steering system further generates a reference torque signal based on the state flag value, and generates a motor-assist torque signal based on the reference torque signal. The state flag value indicates the vehicle motion state in both a dynamic-state or a steady-state. Further, the steering system generates the reference torque signal based on the state flag value by blending a first rack force generated based on a vehicle-speed signal and motor angle, and a second rack force generated based on a motor torque and an input torque provided to a handwheel of the steering system.