PARAMETER PLANE STUDIES OF CAR-STEERING STABILITY WITH COMBINED LATERAL AND PREVIEWED ERROR-SENSING BY THE DRIVER

Parameter plane curves of the driver's minimum preview distance for stability versus driver's gain are mathematically derived to represent boundaries for absolute or relative stability of the complete car-driver system. Driver error input is assumed to be a weighted sum of his lateral position error and predicted error at the preview distance, resulting in a simple steering strategy which permits a car to be driven on winding roads in simulation studies. Parameter plane and gain-crossover theories are compared in operation on a straight road. Tracking accuracy in a steady turn is shown to be improved by a steering strategy in which the driver acts on both lateral and previewed errors. It is also demonstrated that the lateral error becomes zero if the preview distance equals an optimum value, depending on turn speed and radius. Stability plots for straight roads are adapted to the determination of stability in turns. A computer simulation of a car driven on a road S-bend provides information on stability, tracking accuracy, and optimum preview distance. It is concluded that the preview distance should be as great as possible on straight roads to achieve maximum relative stability and minimize the driver's lead time. A winding road generates more driver activity and steering accuracy becomes important.

  • Supplemental Notes:
    • Supported by the Science Research Council.
  • Corporate Authors:

    Mechanical Engineering Publications Limited

    P.O. Box 24, Northgate Avenue
    Bury St Edmunds, Suffolk IP32 6BW,   England 
  • Authors:
    • THOMPSON, A G
  • Publication Date: 1979-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00389621
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-029 648
  • Files: HSL, USDOT
  • Created Date: Oct 30 1984 12:00AM