Slip; Typical Slip Curves - SSANGYONG Korando 2012 Manual

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Slip

The brake slip is the difference between the vehicle speed and the wheel circumference speed. If the

wheel locks, the slip is greatest, that is 100 %. If the wheel is running freely and un-braked, the slip is the

lowest, equal to 0 %. Slip can be calculated from the vehicle speed Vveh and the wheel speed Vw. The

equation for this is:

Vveh = 100 km/h, Vw = 70 km/h

Slip ratio (S) =

For the various road conditions, the friction

coefficients were plotted. The typical course of

the curves is always the same. The only special

feature is shown by the curve for freshly fallen

snow, for this curve increases at 100 % slip. In a

vehicle without ABS, the wheel locks on braking

and therefore pushes a wedge before it. This

wedge of loose surface or freshly fallen snow

means and increased resistance and as a result

the stopping distance is shorter. This reduction in

stopping distance is not possible with a vehicle

with ABS, as the wheel does not lock. On these

surfaces the stopping distance with ABS is

longer than without ABS. The reason for this is

based in physics and not in the Anti-Lock

However, as mentioned before, ABS is not about

the stopping distance, but maneuverability and

driving stability, for the vehicle with locking

wheels without ABS cannot be steered.