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公开(公告)号：US20190351939A1
公开(公告)日：2019-11-21
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
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.
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公开(公告)号：US10099720B2
公开(公告)日：2018-10-16
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
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.
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公开(公告)号：US20220169306A1
公开(公告)日：2022-06-02
申请号：US17107934
申请日：2020-11-30
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Rangarajan Ramanujam , Mariam S. George , Anthony J. Champagne
IPC: B62D5/04
Abstract: A method for generating torque assist includes determining a model yaw rate value based on a vehicle speed, a steering angle, and a road-friction coefficient value and determining a differential yaw rate value using a difference between the model yaw rate value and a vehicle yaw rate value. The method also includes determining an updated road-friction coefficient value using at least the differential yaw rate value and generating a torque assist value based on the updated road-friction coefficient value and a model rack force value.
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公开(公告)号：US11294642B2
公开(公告)日：2022-04-05
申请号：US16932662
申请日：2020-07-17
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Anthony Champagne , Rangarajan Ramanujam , Michael Story , Owen K. Tosh
Abstract: A method includes receiving a first input indicating at least a selected controller type and generating, based on the first input, a model that represents a controller corresponding to the selected controller type. The method also includes receiving a second input indicating at least one functional aspect of the selected controller type, updating, based on the second input, the model to represent the at least one functional aspect of the selected controller type, and compiling, using the model, a binary file that represents, at least, the at least one functional aspect of the selected controller type. The method also includes uploading the binary file to a controller corresponding to the selected controller type.
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公开(公告)号：US11186310B2
公开(公告)日：2021-11-30
申请号：US16185792
申请日：2018-11-09
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Bhuvanesh Sainath , Rangarajan Ramanujam , Anthony Champagne
IPC: B62D5/04
Abstract: According to the technical solutions described herein, an example method for frequency tracking based friction detection includes receiving, by a filter module, an accelerometer signal from an accelerometer coupled with an assist torque system. The method further includes estimating, by the filter module, harmonic content in the accelerometer signal based on an order frequency of the assist torque system. The method further includes in response to the harmonic content that is detected being greater than or equal to a predetermined threshold, initiating a friction estimation in the assist torque system. The method further includes adjusting an amount of torque being generated by the assist torque system based on an estimated friction in the assist torque system.
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Patent Agency Ranking
公开(公告)号：US10822024B2
公开(公告)日：2020-11-03
申请号：US15804281
申请日：2017-11-06
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Rakesh Mitra , Rangarajan Ramanujam
IPC: B62D5/04 , H02P7/285 , H02P29/032
Abstract: Technical solutions are described for current sensor fault mitigation for systems with permanent magnet DC drives. An example power steering system includes a brush motor, and a motor control system that generates an amount of torque using the brush motor, the amount of torque corresponding to a torque command. The motor control system includes a current sensor fault detector that detects a current sensor fault associated with a current sensor used to measure a current across the brush motor. The motor control system further includes a velocity observer that computes an estimated motor velocity in response to the current sensor fault. The motor control system further includes a feedforward controller that generates a current command for generating the amount of torque using the brush motor, the current command generated using the estimated motor velocity.
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公开(公告)号：US20200148253A1
公开(公告)日：2020-05-14
申请号：US16185792
申请日：2018-11-09
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Bhuvanesh Sainath , Rangarajan Ramanujam , Anthony Champagne
IPC: B62D5/04
Abstract: According to the technical solutions described herein, an example method for frequency tracking based friction detection includes receiving, by a filter module, an accelerometer signal from an accelerometer coupled with an assist torque system. The method further includes estimating, by the filter module, harmonic content in the accelerometer signal based on an order frequency of the assist torque system. The method further includes in response to the harmonic content that is detected being greater than or equal to a predetermined threshold, initiating a friction estimation in the assist torque system. The method further includes adjusting an amount of torque being generated by the assist torque system based on an estimated friction in the assist torque system.
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公开(公告)号：US20190135331A1
公开(公告)日：2019-05-09
申请号：US15804281
申请日：2017-11-06
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Rakesh Mitra , Rangarajan Ramanujam
CPC classification number: B62D5/049 , B62D5/046 , B62D5/0481 , H02P7/285 , H02P29/032 , H02P2205/01
Abstract: Technical solutions are described for current sensor fault mitigation for systems with permanent magnet DC drives. An example power steering system includes a brush motor, and a motor control system that generates an amount of torque using the brush motor, the amount of torque corresponding to a torque command. The motor control system includes a current sensor fault detector that detects a current sensor fault associated with a current sensor used to measure a current across the brush motor. The motor control system further includes a velocity observer that computes an estimated motor velocity in response to the current sensor fault. The motor control system further includes a feedforward controller that generates a current command for generating the amount of torque using the brush motor, the current command generated using the estimated motor velocity.
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公开(公告)号：US20180346016A1
公开(公告)日：2018-12-06
申请号：US15994209
申请日：2018-05-31
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Jeffrey M Otto , Rangarajan Ramanujam , Bhuvanesh Sainath
Abstract: Technical solutions are described for lash detection diagnostic in a steering system. An example method includes sending, by a controller, an excitation motor command to a motor control system. The method further includes measuring, by the controller, a sensor signal generated in response to the excitation motor command The method further includes determining, by the controller, a decay rate of a change in magnitude of the signal at a plurality of frequencies. The method further includes diagnosing, by the controller, that the steering system has a lash condition based on the decay rate exceeding a predetermined threshold.
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公开(公告)号：US12054204B2
公开(公告)日：2024-08-06
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
CPC classification number: B62D5/0463 , B62D5/0409 , B62D5/0481
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.
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