Driver Response to Active Front Steer and Power-Assist Failures

Active Front Steer (AFS) has the ability to apply varying road wheel; angles for the same steering wheel angle, depending on the speed of the vehicle. It achieves this by changing the steering gain dynamically and can be a useful drive aid: less steering wheel input is required at low speeds than a more traditional fixed-gain steering system to achieve the same radius of turn. Should an AFS system fail, it is designed to revert back to a fixed-gain system. Concerns have been expressed by designers of AFS systems that this sudden change in steering gain may prove hazardous for drivers and be particularly difficult for them to handle. The aims of this study are to: (1) compare drivers’ behavior using both fully-functioning AFS and power-assisted, fixed-gain rack-and-pinion steering systems; (2) compare driver behavior and response to the failures of both AFS and to the power-assist of a fixed-gain, rack-and-pinion steering system; and (3) conclude whether failure of AFS is potentially more hazardous than failure of the power-assist of fixed-ratio, rack-and-pinion steering systems.

  • Corporate Authors:

    National Advanced Driving Simulator

    University of Iowa, 2401 Oakdale Boulevard
    Iowa City, IA  United States  52242-5003
  • Authors:
    • Jamson, Hamish
    • Wiffin, Phil
    • Burchill, Peter
  • Conference:
  • Publication Date: 2005


  • English

Media Info

  • Media Type: CD-ROM
  • Features: References;
  • Pagination: 10p
  • Monograph Title: Driving Simulation Conference, North America 2005

Subject/Index Terms

Filing Info

  • Accession Number: 01140767
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 28 2009 1:54PM