Advanced emergency braking under split friction conditions and the influence of a destabilising steering wheel torque
Journal article, 2017

The steering system in most heavy trucks is such that it causes a destabilising steering wheel torque when braking on split friction, that is, different friction levels on the two sides of the vehicle. Moreover, advanced emergency braking systems are now mandatory in most heavy trucks, making vehicle-induced split friction braking possible. This imposes higher demands on understanding how the destabilising steering wheel torque affects the driver, which is the focus here. Firstly, an experiment has been carried out involving 24 subjects all driving a truck where automatic split friction braking was emulated. Secondly, an existing driver–vehicle model has been adapted and implemented to improve understanding of the observed outcome. A common conclusion drawn, after analysing results, is that the destabilising steering wheel torque only has a small effect on the motion of the vehicle. The underlying reason is a relatively slow ramp up of the disturbance in comparison to the observed cognitive delay amongst subjects; also the magnitude is low and initially suppressed by passive driver properties.


driver model

heavy vehicles



steering torque


Kristoffer K D Tagesson

Chalmers, Applied Mechanics, Vehicle Engineering and Autonomous Systems

D. Cole

University of Cambridge

Vehicle System Dynamics

0042-3114 (ISSN)

Vol. 55 7 970-994

Subject Categories


Infrastructure Engineering

Vehicle Engineering

Areas of Advance




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5/2/2018 7