ABS-ANTI LOCK BRAKING SYSTEM ?

i just wanted more information on how abs works (simply put) and what it has to do with FRICTION





..any information at all would be great! thanks so much|||The coefficient of static friction is well known to be larger than the coefficient of kinetic friction, i.e. once an object starts to move over its mating surface, the available friction force will be reduced. So, a tire that is skidding will produce less braking force than one that is just about to skid.





Antilock Braking Systems (ABS) control the braking force applied to bring the tire just to the point of skidding, but not actually skidding, optimizing the maximum available braking force. In an actual system, the tire may alternate between skidding and not-skidding many times per second, but it remains nearly optimum braking for a given surface.





In ABS that I'm familiar with, there are speed sensors on each wheel, and a computer controller that monitors the speed of the wheels. When it detects a sudden difference in speed, the braking pressure can be reduced to keep the wheels turning at similar speeds.





A very significant benefit of ABS is that keeping the wheels turning (and not skidding) retains steering control of the vehicle, allowing the driver to use steering in addition to maximum braking effort to avoid a collision. In non-ABS vehicles, a typical panic application of the brakes results in a 4-wheel skid, with reduced braking action and loss of steering, making the driver's continued efforts to avoid an accident all but useless.