In recent years there has been a growing interest in the control of wheel spin under adverse road conditions. Some manufacturers are investigating complex control systems to limit or prevent wheel spin by integrating with the anti-lock brake systems. Other manufacturers are fitting limited slip differential mechanisms of various designs. This paper contains an analysis of a particular type of Torque-Bias-Limited-Slip Differential, showing that for differential action to occur across the unit there must always be a difference of torque at the two output shafts. Parameters affecting this torque difference or Torque Bias Ratio (TBR) between the two shafts are evaluated and the most significant specified. Verification of the analysis is obtained from measurements recorded on a 2.8 ton van fitted with the differential. The existence of the Torque Bias Ratio was established for a number of driving conditions. Finally the magnitude of the yawing moment applied to the vehicle due to the Torque Bias Ratio is evaluated. (A) For the covering abstract of the conference, see IRRD 837684.
Abstract