公开(公告)号：US10773748B2

公开(公告)日：2020-09-15

申请号：US15982228

申请日：2018-05-17

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Zhe Zhang ,  Rakesh Mitra ,  Rangarajan Ramanujam

IPC: B62D5/04 ,  H02K21/02 ,  H02P29/40

Abstract: One or more embodiments are described for preventing controller windup in a motion control system. An example system includes a regulator that receives an input command to adjust a motion control variable of a mechanical system that includes a motor, the regulator configured to generate a first torque command based on the input command and an output torque from the motor. The system further includes a motor control module that receives the first torque command to generate an input torque command that is sent to the motor. The system further includes an anti-windup module that is configured to generate an anti-windup command based on the first torque command and the output torque, the anti-windup command being added to the input command that is sent to the regulator.

公开(公告)号：US20200269910A1

公开(公告)日：2020-08-27

申请号：US16287250

申请日：2019-02-27

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Apurv Naman ,  Rangarajan Ramanujam ,  Anthony J. Champagne

IPC: B62D5/04

Abstract: Technical solutions are described for damping dependent scaling for wheel imbalance reduction in steering systems. An example method includes determining roadwheel speed energy using a roadwheel speed signal. The method further includes determining that the roadwheel speed energy is greater than a predetermined energy threshold, and in response, adjusting the roadwheel speed signal, and computing a wheel imbalance reduction using the adjusted roadwheel speed signal. The method further includes, in case of determining that roadwheel speed energy is not greater than the predetermined energy threshold, and in response computing the wheel imbalance reduction using the roadwheel signal, without any adjustment. The method further includes computing a motor torque command using the wheel imbalance reduction, the motor torque command used to generate a corresponding amount of torque at a handwheel.

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：US20180029640A1

公开(公告)日：2018-02-01

申请号：US15656075

申请日：2017-07-21

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Jeffrey M. Otto ,  Rangarajan Ramanujam ,  Bhuvanesh Sainath

IPC: B62D15/02 ,  G05D1/02 ,  B62D6/08 ,  B62D5/04

CPC classification number: B62D15/025 ,  B62D1/286 ,  B62D5/0463 ,  B62D6/007 ,  B62D6/08 ,  G05D1/021

Abstract: Technical solutions are described for facilitating an electric power steering (EPS) system to determine an operating mode of a vehicle that is equipped with the EPS, where the operating mode is indicative of a level of autonomous driving being used by the vehicle. The technical solutions further facilitate detecting a change in the operating mode of the vehicle, and facilitating a transition in computing an assist signal for the EPS system during the transition between the operating modes.

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.