SYSTEMS AND METHODS FOR ROUGH ROAD DETECTION

    公开(公告)号:US20190308629A1

    公开(公告)日:2019-10-10

    申请号:US15946751

    申请日:2018-04-06

    发明人: Steven Aiuto

    IPC分类号: B60W40/06 G01B21/30

    摘要: An exemplary method for detecting a rough road includes the steps of providing a vehicle sensor, the vehicle sensor configured to measure a steering torque of a vehicle, receiving a steering torque data signal from the vehicle sensor, generating a road condition data signal from the steering torque data signal, evaluating the road condition data signal over a specified time interval, comparing the road condition data signal with one or more thresholds, and determining whether rough road conditions exist based on the comparison of the road condition data signal with the one or more thresholds over the specified time interval.

    TEST METHOD AND METRICS TO EVALUATE QUALITY OF ROAD FEEDBACK TO DRIVER IN A STEER-BY-WIRE SYSTEM

    公开(公告)号:US20200001914A1

    公开(公告)日:2020-01-02

    申请号:US16020389

    申请日:2018-06-27

    IPC分类号: B62D6/00 B62D5/00

    摘要: 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.