Anti Lock Braking System

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ABS is an abbreviation for Anti-lock Braking System. The system helps the driver maintain some steering ability and avoid skidding while braking. The typical ABS system includes wheel-speed sensors, a hydraulic control unit, and an electronic control unit. When you apply the brake pedal, the electronic control unit monitors and compares the signals from the wheel-speed sensors. If the electronic control unit senses rapid deceleration (impending lock-up) at a given wheel, the electronic control unit commands the hydraulic control unit to reduce hydraulic pressure to that wheel. This type of pressure limiting is similar to pumping the brake pedal, only much faster. Some pick-up trucks and cargo vans have rear-wheel only ABS to handle different braking needs under different loading conditions. Since the ABS will not allow the tire to stop rotating, one can brake and steer at the same time. The braking and steering ability of the vehicle is limited by the amount of traction the tire can generate.

An Anti-Lock braking system (ABS) is a safety system on motor vehicles which prevents the wheels from locking while braking.
The Anti-lock Braking System is designed to maintain vehicle control, directional stability and optimum deceleration under severe braking conditions on most road surfaces
It does so by monitoring the rotational speed of each wheel and controlling the brake line pressure to each wheel during braking. This prevents the wheels from locking up.
A rotating road wheel allows the driver to maintain steering control under heavy braking.

Automatic stability control + traction (ASC+T) are the technology that revolutionized the world of automobile handling and control. asc+t assist the motorist to have a better control over the vehicle it was realized that there is a need for a better handling system to assist the driver in the dire situations, where he could steer through the obstacle even while braking at the limit which would not be possible with the conventional type of braking system. The antilock braking system (ABS) was brought into the market which met the requisites, the further advancements over the abs is the ASC+T which has control over the engine output for better control.

ABS and ASC+T will be dealt separately ABS will be dealt with firstly as it becomes very necessary, first to understand ABS to get the concepts behind ASC+T.

Like most materials, the rubber on a tyre has the greatest friction (traction) on pavement when it isn?t sliding. When the tyre is rolling, the contact patch on the ground is stationary when a tyre is skidding, the contact patch is sliding. To achieve maximum braking (or acceleration or cornering) force, it?s necessary to keep the contact patch from sliding.

Due to a number of force interactions when the tyre rubber ant the tread flexes, the maximum traction force occurs when there is 10-20% slippage. This turns out to be really useful. If there was no slippage at all before loss of traction, it would be almost impossible for the system to predict impending loss until after it actually occurred. (Learning a feel for this slippage is an extremely useful skill for the driver too, but that?s another subject). By adjusting (reducing) the braking force at a wheel that?s about to lock up, maximum traction can be maintained.

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