A Study of Jackknife Stability of Class VIII Vehicles with Multiple Trailers with ABS Disc/Drum Brakes

This paper presents the development of a antilock brake system (ABS) model for a double tractor-trailer combination vehicle in order to investigate the jackknife stability of these vehicles with mixed braking configurations between the tractor (disc brakes) and trailers and dolly (pneumatic drum brakes). Simulation software was used to model the ABS behavior of the vehicle and vehicle dynamics. Brake-in-turn maneuvers were performed with varying vehicle loads and surface conditions. Conditions with ABS ON for the entire vehicle (and select-high control algorithm on the trailers and dolly) found that instabilities (i.e., lane excursions and/or jackknifes) were exhibited under conditions when the surface friction coefficient was 0.3. It was demonstrated that these instabilities could be avoided while using a select-low control algorithm on the trailers and dolly. Simulation results with the ABS OFF for the tractor showed that a tractor equipped with disc brakes had greater jackknife stability. However, the vehicle left the intended path at an earlier moment in the maneuver than a vehicle equipped with drum brakes under the same simulated conditions. A comparison showed that the tractor was the least stable unit with the ABS OFF conditions, while the dolly was the least stable unit with the ABS ON conditions.


  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-21
  • Monograph Title: Safety Performance and Accident Free Driving

Subject/Index Terms

Filing Info

  • Accession Number: 01003818
  • Record Type: Publication
  • ISBN: 0768015332
  • Files: TRIS
  • Created Date: Sep 9 2005 11:30PM