Steering Solutions IP Holding Corporation

Bhuvanesh Sainath

Rangarajan Ramanujam

Prerit Pramod

Tejas M Varunjikar

Jeffrey M Otto

Anthony J Champagne

Apurv Naman

A steer by wire system includes a controller operable to operate a roadwheel actuator such that a position command to the roadwheel actuator based on a handwheel orientation is a magnitude corresponding to a handwheel orientation offset value in an opposite direction to reduce a difference between the handwheel orientation offset value and a predetermined handwheel zero value.

Steer by wire drift compensation

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.

Rack force estimation for steering systems

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.

Frequency tracking based friction detection using accelerometer

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.

Lash detection startup diagnostic

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.

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Saginaw, MI, United States of America

Bhuvanesh Sainath