Basic Theory Of Abs Function; Stopping Distance; Brake Force On A Wheel; Maximum Brake Force - SSANGYONG Korando 2012 Manual

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2) Basic Theory of ABS Function

To give you a better understanding of the tasks and functions of ABS, we will first look at the physics

The stopping distance depends on the vehicle weight and initial speed when braking starts. This also

applies for vehicle with ABS, where ABS always tries to set an optimum brake force on each wheel. As

great forces are exerted between the tires and the carriageway when braking, even with ABS the wheels

may scream and rubber is left on the road. With an ABS skid mark one may be able to clearly recognize

the tire profile. The skid mark of an ABS vehicle does not however leave any hint of the speed of the

vehicle in the case of an accident, as it can only be clearly drawn at the start of braking.

The maximum possible brake force on a wheel depends on the wheel load and the adhesion coefficient

between tire and carriageway. With a low adhesion coefficient the brake force, which can be obtained is

very low. You are bound to know the result already from driving on winter roads. With a high adhesion

coefficient on a dry road, the brake force, which can be obtained, is considerably higher. The brake

force, which can be obtained, can be calculated from below formula:

FBmax = wheel load FR x coefficient of frictionMh

The braking process cannot be described sufficiently

accurately with the brake forces calculated. The

values calculated only apply if the wheel is not locked.

In the case of a locking wheel, the static friction turns

into lower sliding friction, with the result that the

stopping distance is increased. This loss of friction is

termed "slip" in specialist literature.