Drivers continually require steering performance improvement, particularly in the area of feedback from the road. In this study, we develop a new electrically-assisted steering logic by 1) analyzing existing steering systems to determine key factors, 2) modeling an ideal steering system from which to obtain a desirable driver torque, 3) developing a rack force observer to faithfully represent road information and 4) building a feedback compensator to track the tuned torque. In general, the estimator uses the driver torque, assist torque and other steering system signals. However, the friction of the steering system is difficult to estimate accurately. At high speed, where steering feeling is very important, greater friction results in increased error. In order to solve this problem, we design two estimators generated from a vehicle model and a steering system model. The observer that uses two estimators can reflect various operating conditions by using the strengths of each method. Therefore, it reflects the driving situation more precisely. We evaluated real vehicle performance under various operating conditions to compare the actual rack force and the rack force of the estimator, verifying the accuracy. Simulation-based evaluation and vehicle test confirmed that the proposed logic improves the steering feedback performance, and the robustness to component dispersion.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Improvement of Steering Performance Using Steering Rack Force Control


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    WCX SAE World Congress Experience ; 2019



    Publication date :

    2019-04-02




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Steering Rack

    NEMETH DENNIS | European Patent Office | 2019

    Free access

    RACK FORCE ESTIMATION FOR STEERING SYSTEMS

    RAMANUJAM RANGARAJAN / SAINATH BHUVANESH / VARUNJIKAR TEJAS M et al. | European Patent Office | 2020

    Free access

    Rack steering control piston

    FARCY MARC | European Patent Office | 2017

    Free access

    STEERING RACK STOPPER

    SOVERN JASON A | European Patent Office | 2020

    Free access

    Rack steering gear

    WANG XINGYAO | European Patent Office | 2015

    Free access