SWEDISH EXPERIMENTAL SAFETY VEHICLE PROGRAM. STEERABILITY DURING EMERGENCY BRAKING. FIELD TESTING. PERFORMANCE TESTS. LOW-FRICTION, VARIABLE FRICTION, HIGH FRICTION

The test results are based on about 1000 low-friction tests, about 200 variable-friction tests, and about 200 high-friction tests. The test results have led to the choice of the body side slip angle as the characteristic quantity for stability. The tests show that acceptable stability exists during these conditions if the maximum body side slip angle does not exceed 20 degrees during the test. The ratio y/s has turned out to be a proper characteristic for steerability during braking. In this ratio, s is the brake distance and y is the lateral movement in a vehicle-fixed right-hand orthogonal axis system, where the origin is the position of the vehicle's centre of gravity at brake application and the x-axis coinciding with the vehicle's velocity direction at brake application. Low-friction tests show that there is no simple connection between deceleration and steerability on the low-friction surface and with the used open-loop test method. Variable-friction tests show a slight connection between brake performance and steerability in the way that the deceleration decreases when the steerability increases. High-friction tests show that there is a distinct connection between brake performance, steerability, and stability. At increasing steerability, the mean deceleration decreases and the stability deteriorates. See also IRRD abstracts nos. 212440, 212441 and 212443. /TRRL/

  • Corporate Authors:

    Saab-Scania, Apbrs

    Trollhaettan,   Sweden 

    AB Volvo, PV 3B

    Goeteborg,   Sweden 
  • Authors:
    • Bjoerksund, A A
    • Larsson, G
    • Knutson, K
  • Publication Date: 1974-6

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 58 p.
  • Serial:
    • Issue Number: 3-02

Subject/Index Terms

Filing Info

  • Accession Number: 00096808
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: R&D Rpt.
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM