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  USA  90250

    National Highway Traffic Safety Administration

    Office of Passenger Vehicle Research, 1200 New Jersey Avenue, SE
    Washington, DC  USA  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