DEVELOPMENT OF CAR/TRAILER HANDLING AND BRAKING STANDARDS. VOLUME II: TECHNICAL REPORT FOR PHASE I - REAR WHEEL DRIVE TOW CARS

This report identifies suitable handling and braking performance requirements for rear-wheel drive passenger cars towing trailers. This includes straight line braking, trailer swing stability, tow car steady turn stability, and combined brake-in-turn stability. Over 2000 combination-vehicle tests with eight trailers and three tow cars (in over 250 different configurations), plus the results of previous trailer towing research were then used to validate and/or revise the criteria and procedures. For straight line braking performance a combination-vehicle deceleration criterion of 0.4 g is recommended. A tow car weight requirement based on trailer brake capability is presented to insure the combination vehicle will meet the deceleration requirement. For trailer swing stability the safety-related performance measure is damping ratio, or the equivalent cycles to one-half amplitude. A minimum damping ratio of 0.15 (or 3/4 cycles to 1/2 amplitude) is recommended. Test procedures and analysis curves are presented which can be used to determine damping ratios for each trailer. In this case a minimum hitch load criterion based on tow car weight is suggested to insure performance compliance. For tow car stability a tentative performance criterion of maintaining a positive tow car understeer gradient up to and including 0.3 g cornering is recommended.

  • Supplemental Notes:
    • See also Volume 1, PB80-196611 and Volume 3, PB80-196637. Also available in set of 4 reports PC E12, PB80-196603.
  • Corporate Authors:

    Systems Technology, Incorporated

    13766 South Hawthorne Boulevard
    Hawthorne, CA  United States  90250

    National Highway Traffic Safety Administration

    Office of Passenger Vehicle Research, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Klein, R H
    • Szostak, H T
  • Publication Date: 1979-11

Media Info

  • Pagination: 150 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318419
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: STI-TR-1114-1-VOL-2, DOT-HS-805-327
  • Contract Numbers: DOT-HS-7-01720
  • Files: NTIS, TRIS, USDOT
  • Created Date: Oct 8 2002 12:00AM