公开(公告)号：US20190351942A1

公开(公告)日：2019-11-21

申请号：US15984830

申请日：2018-05-21

Applicant: GM Global Technology Operations LLC

Inventor： Gabriel de Paula Eduardo

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

Abstract: A system correcting for a traction steer event includes a steering wheel angle entered into a steering wheel angle function to identify a steering wheel angle gain. A steering wheel velocity is entered into a steering wheel velocity function to identify a steering wheel velocity gain. A vehicle speed is entered into a vehicle speed function to identify a vehicle speed gain. A propulsion motor torque is entered into a motor torque function to identify a propulsion motor torque gain. A vehicle yaw rate is entered into a yaw rate function to identify a yaw rate gain. The gains are all multiplied to obtain a final gain. The final gain is submitted to a control module which determines a steering torque overlay required to adjust a torque output from an electric power steering motor.

公开(公告)号：US20200001914A1

公开(公告)日：2020-01-02

申请号：US16020389

申请日：2018-06-27

Applicant: GM Global Technology Operations LLC

Inventor： Bo Yu ,  Ibrahim A. Badiru ,  Steven Aiuto ,  Gabriel de Paula Eduardo

IPC: B62D6/00 ,  B62D5/00

Abstract: A method to evaluate a quality of road feedback to a driver in a steer-by-wire system includes setting a test bench by grounding a steering system steering wheel using a physical 6th order impedance constraint; preloading the steering system with data defining a steering wheel angle and a vehicle speed; applying tie rod load signals to the steering system and recording signals representing each of a tie rod load, a steering wheel torque and a steering wheel acceleration. In parallel: applying first a fast Fourier transform algorithm to the recorded signals to calculate each of a gain, a phase and a coherence response from the tie rod load to the steering wheel torque; applying second a fast Fourier transform algorithm to the recorded signals to calculate a power spectral density of the steering wheel torque versus frequency; and applying frequency weighting functions to the gain and power spectral density functions.