1973-02-01

The Mather Jackknife Control Unit 730641

Jackknifing occurs with and without braking. It occurs whenever the slip angles of the rear tractor wheels exceed the value at which the maximum side force is developed. Jackknifing will occur even with partial skid of rear tractor wheels because the semi-trailer pushes on the hitch introducing a yaw moment, which in turn, increases the tractor's yaw rate.
Since no satisfactory solution is available to the jackknifing problem through controlled braking, the Mather Control Unit is developed to employ the velocity2 or V2 damping characteristic so desirable to driver control, which provides low damping at low yaw rates, but increases rapidly to provide adequate counter torque at about 5°/second and thus effectively control jackknifing with or without braking.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Jackknife Avoidance in Large Trucks Using Active Front Steering

2004-01-2639

View Details

TECHNICAL PAPER

Lateral/Directional Stability of Tow Dolly Type Combination Vehicles

960184

View Details

TECHNICAL PAPER

Rear Axle Steering By Variable Rear Wheel Toe: A Possibility To Optimize Transient Response Of Automobiles From The Driver's View Too

885088

View Details

X